159 results about "Mn element" patented technology

The invention provides an anodic oxidation die-casting aluminum alloy and a preparation method thereof. The anodic oxidation die-casting aluminum alloy comprises the following elements in percentage by mass: 2-4% of Mg element, 0.2-2% of Si element, 1.6-2.4% of Mn element, 0.2-0.3% of Cu element, less than or equal to 2% of Zn element, less than or equal to 0.2% of Fe element, less than or equal to 0.2% of inevitable impurities and the balance of Al, wherein the sum of the mass content of the Mg element and the mass content of the Zn element is 2-4%; the surface chromatic aberration of the anodic oxidation die-casting aluminum alloy is lt; the white brightness L is larger than or equal to 85, the tensile strength ranges from 180 MPa to 210 MPa, the yield strength ranges from 80 MPa to 120 MPa, and the elongation ranges from 3% to 5%. The anodic oxidation die-casting aluminum alloy has excellent flowability and surface glossiness, and is good in surface quality and high in yield.

The invention provides a high-dielectric low-loss X7P type dielectric ceramic material and a preparation method and application thereof, and relates to the technical field of functional ceramic materials, the dielectric ceramic material is composed of a perovskite type compound as a main component and an auxiliary component; wherein the perovskite type compound contains a Ba element and a Ti element, and the auxiliary components comprise a first auxiliary component containing an Mg element, a second auxiliary component containing SiO2, a third auxiliary component containing an Mn element and a fourth auxiliary component containing a rare earth element R. According to the invention, barium titanate is doped and modified, so that the excellent performance of combining different compounds is realized, the dielectric constant and temperature stability of the dielectric ceramic material are improved, and the dielectric loss is reduced.

The invention discloses a preparation method of an aluminum alloy cast rod. The preparation method comprises the following steps: mixing and melting an intermediate alloy containing an aluminum element, an intermediate alloy containing a Mn element and an intermediate alloy containing a Fe element; an online refiner is added; carrying out refining treatment on the molten liquid, and carrying out slagging-off operation to remove impurities; an intermediate alloy containing the Ce element is added into the molten liquid obtained after refining and slagging-off, and the final adding amount of the Ce element in the aluminum alloy casting rod is 0.3-1 wt% by mass; and the melt added with the Ce element is filtered, the treated melt is cast, and the aluminum alloy cast rod is obtained. The strength, the tensile strength and the yield strength of the aluminum alloy modified through the method are all remarkably improved.

The invention discloses high-surface-quality 780MPa-grade hot-dip galvanized DH steel and a production process thereof. The hot-dip galvanized DH steel comprises the following main chemical components in percentage by mass: 0.155 to 0.19 percent of C, 1.6 to 2.0 percent of Mn, 0.2 to 0.6 percent of Si, 0.1 to 0.15 percent of Cr, 0.4 to 1.0 percent of Al, 0.015 to 0.030 percent of Nb, less than or equal to 0.021 percent of Ti, 0.7 to 1.5 percent of Si and Al, and the balance of Fe and inevitable impurities. By accurately controlling the contents of Si and Mn in the steel and assisting with pre-oxidation-reduction treatment, external oxidation of Si and Mn elements is reduced to the maximum extent, the wettability and adhesive force of the surface of the steel are improved, and therefore high-quality hot galvanizing treatment is achieved, and the problem of skip plating is effectively solved. According to the comprehensive technical means, the excellent performance of the steel is reserved, meanwhile, the completeness and uniformity of a plating layer are guaranteed, the corrosion resistance of a product is improved, and the service life of the product is prolonged.

The invention discloses 780MPa-grade hot-dip galvanized DH steel and a manufacturing method thereof, the alloy components of DH780 steel grade are optimized, the contents of Si and Mn elements are reduced, and the generation of external oxides is reduced, so that the risk of plating leakage defects is reduced; besides, by improving the dew point in the annealing process and increasing the oxygen partial pressure in the annealing atmosphere, internal oxidation of Si and Mn elements on the surface layer of the DH780 steel grade is promoted, so that the plating leakage defect is effectively reduced, and the surface quality of the steel plate is remarkably improved; according to the method, the production cost is reduced, the weldability and machinability of a product are improved, the integrity and uniformity of a plating layer are effectively improved, the corrosion resistance of the product is improved, the service life of the product is prolonged, and the application range of the DH780 steel grade hot-dip galvanized steel plate is widened.

The invention provides an aluminum alloy wire and a preparation method thereof. The aluminum alloy wire comprises the following elements in percentage by mass: 0.1 to 7.0 percent of Zn element, 0.2 to 9.6 percent of Mg element, 0.1 to 6.0 percent of Cu element, 0.01 to 1.2 percent of Mn element, 0.1 to 2.0 percent of Fe element, 0.1 to 2.5 percent of Si element, less than or equal to 0.15 percent of inevitable impurities and the balance of Al element, the surface brightness L of the aluminum alloy wire is greater than 60, and the surface brightness color difference E is less than or equal to 0.5; the average roughness Sa is less than or equal to 0.4 mu m, and the maximum peak height Sp is less than or equal to 2.0 mu m; the aluminum alloy wire does not crack after 85% compression deformation; under the test conditions that the temperature is 35 DEG C, and the aluminum alloy wire is placed in a mixed solution of a 57g / L NaCl solution and a 10mL / L H2O2 solution to be soaked for 6 hours, the corrosion depth of the aluminum alloy wire is smaller than or equal to 10 micrometers.

The invention relates to a GH5605 cobalt-based high-temperature alloy and a manufacturing method thereof, and belongs to the technical field of metal smelting. The GH5605 alloy comprises the following chemical components: 0.05%-0.15% of C, less than or equal to 1.0% of Si, 1.0%-2.0% of Mn, less than or equal to 0.03% of S, less than or equal to 0.03% of P, 19.0%-21.0% of Cr, 9.0%-11.0% of Ni, 14.0%-16.0% of W, less than or equal to 3.0% of Fe and the balance of Co and other inevitable impurities. According to the manufacturing method, the GH5605 electrode bar is smelted through a vacuum induction furnace, refining and argon protection processes are adopted, and it is ensured that the Mn element content of the electrode bar is qualified. And in the vacuum consumable remelting process, argon with the pressure of 2000-3000 Pa is filled, so that the vacuum degree is reduced, Mn element volatilization is effectively inhibited, and section component uniformity is achieved. Detection shows that the Mn content at the edge, the 1 / 2 radius and the central part of the steel ingot meets the technical standard. The process is simple and efficient, the quality of molten steel is not affected, the performance consistency and production stability of the GH5605 steel ingot are remarkably improved, and the process is suitable for the high-end application field.

The invention discloses high-strength, high-toughness and high-wear-resistance low-carbon chromium-molybdenum alloy cast steel and a heat treatment process, belongs to the technical field of cast steel and heat treatment, and solves the technical problem that AS-1444-Grade4320 alloy steel subjected to heat treatment is insufficient in comprehensive mechanical property. By properly increasing the contents of C, Si and Mn elements, the upper limit of the body strength is increased, and the alloy structure is improved in cooperation with adjustment of Cr, Mo, Ni and other alloy elements; on the basis of component design, the heat treatment process of normalizing, quenching and tempering is adopted, after heat treatment, the metallographic structure is tempered sorbite, the grain size reaches the level 9, the strength, toughness and wear resistance of the casting are obviously improved, meanwhile, the hardness of the casting is controlled within the reasonable range, the wear resistance of the casting is better matched, and the service life of the casting is prolonged. Comprehensive service performances such as wear resistance and fatigue resistance are improved, and the service life and the use efficiency of the casting are effectively improved.

The invention provides a high-dielectric low-loss ceramic composition as well as a preparation method and application thereof, and relates to the technical field of functional ceramic materials, the high-dielectric low-loss ceramic composition comprises a perovskite type compound serving as a main component and an auxiliary component; wherein the perovskite type compound contains a Ba element and a Ti element, and the auxiliary components comprise a first auxiliary component containing an Mg element, a second auxiliary component containing an Nb element, a third auxiliary component containing an Mn element, a fourth auxiliary component containing a rare earth element R, and a fifth auxiliary component containing SiO2. According to the present invention, the ratio of the main components to the auxiliary components is subjected to design optimization, the ratio of the Nb element in the second auxiliary component to the Mn element in the third auxiliary component is adjusted, and the material preparation process parameters are subjected to optimization control, such that the dielectric constant and the temperature stability of the dielectric ceramic material are improved, and the dielectric loss is reduced.

The invention provides a regeneration method of an aluminum-silicon alloy, a regenerated silicon-aluminum alloy and an iron-rich phase alloy. The regeneration method comprises the steps that S1, raw materials of the aluminum-silicon alloy are smelted, and a first melt is obtained; s2, an aluminum-manganese intermediate alloy and an aluminum-chromium intermediate alloy are added into the first melt, and a second melt is obtained; the second melt contains Fe element, Mn element and Cr element; s3, refining treatment is conducted on the second melt, and a third melt is obtained; and S4, the third melt is added into a casting mold, mechanical vibration is conducted on the casting mold under the vibration condition so that the third melt can be solidified, and the regenerated aluminum-silicon alloy and the iron-rich phase alloy are obtained. Vibration equipment is used for applying a vibration field to the casting mold, and meanwhile, the proportion of alloy elements and the smelting process are accurately controlled in a matched mode, so that preparation of the low-iron secondary aluminum-silicon alloy is achieved.

The present invention discloses a preparation method of cold-rolled medium manganese QP steel based on Mn inhomogenization regulation, belonging to the field of preparation of medium manganese QP steel. The method comprises the following steps: increasing the Mn content of traditional QP steel to obtain an experimental steel; performing smelting, forging and rolling on the experimental steel to obtain a cold-rolled plate; pre-treating the cold-rolled plate to obtain initial lath martensite; sequentially performing critical region annealing treatment and rapid austenitization treatment on the steel plate containing the initial lath martensite to obtain a steel plate with non-uniform distribution of Mn element; and performing quenching and partitioning treatment on the steel plate with non-uniform distribution of Mn element to form a medium manganese QP steel with a core-shell structure.

The present invention relates to a 5XXX aluminum alloy and a preparation method and application thereof. In terms of mass percentage, the 5XXX aluminum alloy includes Si 0.1-0.4%, Fe 0.35-0.6%, Cu 0.05-0.3%, Mn 0.4-0.9%, Mg 3.5-5.0%, Cr 0.05-0.3%, Zn 0-0.25%, Sr 0.01-0.15%, Mo 0.01-0.15%, Be 0-0.001%, Ti≤0.15%, other impurities≤0.15%, and the remainder is Al. The 5XXX aluminum alloy of the present application still shows high strength and excellent formability under high Fe and Mn element contents. The 5XXX aluminum alloy of the present application can be prepared using recycled aluminum alloy, and itself has very good recyclable recovery capacity, and has great advantages in reducing carbon emissions.

The invention discloses a hot-rolled steel strip for a high-strength, corrosion-resistant hollow anchor rod welded pipe and a preparation method thereof. The hot-rolled steel strip comprises the following elements by weight: C 0.18-0.23%, Si 0.15-0.30%, Mn 0.90-1.10%, P≤0.020%, S≤0.007%, Nb 0.02-0.04%, Cr 0.70-0.90%, Cu 0.20-0.50%, Ti 0.01-0.03%, Sb 0.04-0.08%, and the rest is Fe and unavoidable impurities. The present invention controls the content of Si and Mn elements while ensuring the strength of the material and reducing the carbon equivalent, adds a certain amount of Ti element to form precipitates during welding to inhibit the coarsening of the heat affected zone structure to improve the welding performance, controls the content of Nb element to exert the fine grain strengthening effect to further ensure the strength, and controls the content of Cu, Cr and Sb elements to ensure that the corrosion resistance of the anchor steel matches the strength and toughness, thereby improving the corrosion resistance of the material in the wet environment of tunnels and rock and soil.

The invention belongs to the technical field of low-carbon dehydrogenation aids, and particularly relates to a heat balance aid as well as a preparation method and application thereof. The heat balance auxiliary agent comprises Al, Ca, Si, Cu and Mn elements existing in an oxide form; wherein the Al2O3, the CaO and the SiO2 jointly form a skeleton structure of the auxiliary agent, and the CuO and the MnO2 are used as active components and are attached to the skeleton structure; the molar ratio of metal elements in the heat balance auxiliary agent is as follows: Al: Ca: Si: Cu: Mn = (49-78.9): (15-25): (1-10): (5-15): (0.1-1). The heat balance additive prepared by the invention shows excellent anti-sintering capability, long service life and stable heat supply performance under harsh reaction conditions such as propane dehydrogenation, and can effectively improve the selectivity of target olefin and reduce the generation of byproducts such as methane.

The present invention relates to a high-strength and high-plastic quenching-partitioning steel based on Mn chemical inhomogeneity and a preparation method thereof, which belongs to the field of third-generation advanced high-strength steel; its chemical composition mass percentage is: C: 0.2-0.4%, Mn: 2-5%, Si: 1-3%, P: ≤ 0.005%, S: ≤ 0.005%, and the balance is Fe and unavoidable impurities. By optimizing process parameters such as critical annealing temperature and time, it is ensured that a reasonable volume fraction of poor / rich Mn zone and Mn content are obtained; and by utilizing rapid heating and extremely short austenitization and heat preservation, the diffusion of Mn element is suppressed, the uneven distribution of Mn is retained, and a high-temperature austenite consisting of polygonal Mn-poor austenite and polygonal Mn-rich austenite is formed. Due to the uneven distribution of Mn elements, the martensitic phase transformation temperature range is increased, and martensitic lath refinement is achieved using a lower quenching temperature. The present invention achieves martensitic lath refinement while retaining more residual austenite, and the yield strength of the material is significantly improved.

The invention provides a 5G50 aluminum alloy plate strip for anodic oxidation and a preparation method of the 5G50 aluminum alloy plate strip. The 5G50 aluminum alloy plate strip for anodic oxidation comprises the following elements in percentage by mass: 0.01%-0.10% of Si element, 0.04%-0.15% of Fe element, 3.0%-4.0% of Mg element, 0.2%-1.2% of Mn element, less than or equal to 0.02% of inevitable impurity element in total content, less than 0.05 wt% of single impurity element and the balance of Al. Wherein after the aluminum alloy plate strip is subjected to anodic oxidation treatment, the surface of the aluminum material has no heterochromatic stripe defect, and the chromatic aberration E is less than 0.15. The 5G50 aluminum alloy plate strip for anodic oxidation can give consideration to both high surface quality and excellent mechanical performance, is widely applied to 3C consumer electronics, and can achieve the practical effects of falling resistance, light weight and attractive appearance of the product.

The invention provides an anodic oxidation die-casting aluminum alloy and a preparation method thereof. The anodic oxidation die-casting aluminum alloy comprises the following elements of, by mass, 0.01%-1% of Mg element, 0.01%-2% of Zn element, 0.01%-2% of Si element, 0.01%-1% of Ni element, 0.2%-0.5% of Fe element, 1.6%-2.4% of Mn element, 0.1%-0.2% of Cu element, 0.02%-0.2% of Ti element, the total content of inevitable impurities smaller than or equal to 0.2%, and the balance Al element. Wherein the sum of the mass content of the Mg element and the mass content of the Zn element is 1-3%, the sum of the mass content of the Si element and the mass content of the Ni element is 0.1-2.5%, and the sum of the Fe element, the Si element and the Ni element is 0.1-3%. The aluminum alloy can be better used for producing thin-wall piece products with the thickness of 0.8-1.8 mm.

The invention belongs to the field of selective laser melting rapid prototyping, and discloses a TiCN nanoparticle-containing magnesium alloy for selective laser melting and application thereof, and the TiCN nanoparticle-containing magnesium alloy powder for selective laser melting comprises the following components by mass: 8.5-9.5% of Al element, 0.5-0.9% of Zn element, 0.2-0.4% of Mn element, 1.5-2.5% of TiCN nanoparticles, less than or equal to 0.1% of impurity, and the balance of Mg element. The TiCN nanoparticles are introduced into the magnesium alloy, the selective laser melting process is matched, the mechanical property of the correspondingly obtained SLM magnesium alloy forming part is good, the ductility of the forming part is further improved through the refined and uniform magnesium alloy grain structure and dispersively distributed nano TiCN, and the tensile strength, the yield strength and the creep fracture life of the forming part are all improved.

The invention discloses hard alloy welding powder for valve sealing surface surfacing and a preparation method of the hard alloy welding powder. The welding powder comprises 1.20%-1.40% of C element, 2.70%-3.5% of Si element, 3.00%-4.50% of Mn element, 24.00%-26.00% of Cr element, 2.00%-2.20% of Mo element, 3.50%-4.50% of Ni element, smaller than or equal to 0.20% of Co element, smaller than or equal to 0.02% of B element, smaller than or equal to 0.10% of N element and the balance Fe element. The preparation method comprises the following steps: weighing raw materials, mixing and smelting the raw materials to obtain alloy liquid; and the alloy liquid is subjected to gas atomization to prepare powder, and the hard alloy welding powder is obtained after screening. The Co element content is strictly limited, and meanwhile the hardness and other performance can meet the design requirement; the preparation method is simple and reliable in process.

The invention discloses a 7-series aluminum alloy material and a preparation method thereof, and belongs to the field of aluminum alloy preparation.The 7-series aluminum alloy material and the preparation method thereof have the advantages that on the basis of optimizing components of 7-series aluminum alloy, the proportion and the process of the components are properly adjusted, it can be guaranteed that the tensile strength, the yield strength and the ductility meet the use requirements on the whole, and the corrosion resistance can be further improved; by adding the Zn element and the Mg element, the strength and hardness of the 7-series aluminum alloy can be remarkably improved, a proper Cu or Cr ratio can reduce residual phases (a T-Al2Mg3Zn3 phase, an AlZnMgCu phase or an AlZnMgCr phase), but after solution treatment, the residual phases gradually disappear, all alloy elements can be dissolved in a matrix in a solid mode, an AlFe phase is reduced, then corrosion sites are reduced, and by combining the synergistic effect of the Mn element and the V-containing refiner, the corrosion resistance of the 7-series aluminum alloy is improved. The crystalline phase in the 7-series aluminum alloy is refined, so that the mechanical property of the 7-series aluminum alloy can be obviously improved, and the corrosion resistance of the 7-series aluminum alloy can be obviously improved.

The present invention belongs to the field of microwave dielectric ceramic materials, and specifically provides a method for improving the performance of zinc-magnesium-titanium microwave ceramics based on the Jan-Taylor effect, so that the prepared zinc-magnesium-titanium microwave dielectric ceramic material has low dielectric loss and low resonant frequency temperature coefficient, and is suitable for manufacturing ceramic substrates with excellent performance. 0.7 Mg 0.3 TiO3 system, by introducing Mn element, makes the material produce Jan-Taylor effect, distorts the crystal structure, hinders ion migration, and enhances the structural stability of the ceramic; finally, the present invention improves the Zn 0.7 Mg 0.3 The dielectric properties of TiO3 microwave ceramics have obtained a microwave dielectric ceramic material with a dielectric constant of 20.689, Q×f=50807.9, and a resonant frequency temperature stability coefficient of ‑22.3ppm / ℃, which is expected to be used in the manufacture of ceramic substrates.

The application discloses high-temperature piezoelectric ceramics for high-power scenes and a preparation method thereof, and belongs to the technical field of piezoelectric ceramics. The high-temperature piezoelectric ceramic is Mn-doped lead zirconate titanate-based piezoelectric ceramic; the lead zirconate titanate-based piezoelectric ceramic is a three-phase solid solution of Pb(Yb 1 / 2 Nb 1 / 2 )O3, PbZrO3 and PbTiO3; and the doping mode of the Mn element is metal oxide MnO2 doping or composite oxide Pb(Mn 1 / 3 Nb 2 / 3 )O3 doping. The application solves the process problems existing in material industrialization by controlling the composition of the material, overcomes the problem that high piezoelectric performance and high Curie temperature and high mechanical quality factor are difficult to be compatible, and obtains high-power high-temperature piezoelectric ceramics with excellent comprehensive performance.

The invention discloses a low-cost, high-strength and low-yield-ratio wire rod for a rivet nut and a preparation method of the wire rod, and belongs to the field of metallurgical production of wire rods. The wire rod comprises the following chemical components in percentage by weight: 0.19 to 0.23 percent of C, 0.35 to 0.55 percent of Si, 1.30 to 1.60 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.25 to 0.35 percent of Cr, 0.002 to 0.020 percent of Al and the balance of Fe and inevitable impurities. The preparation method comprises the steps of smelting and casting, cogging, wire rod controlled rolling, cooling and the like, and the grain size of a wire rod is controlled to be 5-6 levels by optimizing component design (solution strengthening is mainly conducted on low-cost Si and Mn elements) and technological parameters (high-temperature heating, precise controlled rolling and controlled cooling, low-Al design and the like); the tensile strength of the rivet nut manufactured through follow-up modification, cold heading and annealing treatment reaches 530-610 MPa, the yield strength ranges from 320 MPa to 360 MPa, the yield ratio is smaller than or equal to 0.6, the 10.9-level requirement is met after riveting hardening, the production cost is remarkably reduced, and the problems that an existing high-level rivet nut depends on precious metal, the yield ratio is high, and cracking is likely to happen are solved.

The invention relates to the technical field of high-performance aluminum alloy materials, in particular to a high-strength heat-resistant A < l >-Cu alloy based on an interface stabilization strategy and a preparation method thereof.The high-strength heat-resistant A < l >-Cu alloy comprises, by mass, 5.03% of Cu, 0.29% of Sc, 0.22% of Zr, 0.31% of Mn, smaller than or equal to 0.05% of single impurity elements, smaller than or equal to 0.15% of total impurity elements and the balance A < l >; after 1000 hours of thermal exposure at the temperature of 300 DEG C, the tensile strength is still larger than or equal to 300 MPa and is far superior to that of a traditional Al-Cu alloy, back-to-back synergistic segregation of Sc and Mn elements is achieved for the first time, theta '-phase coherent and semi-coherent interfaces are synchronously stabilized, the coarsening path is comprehensively blocked, the utilization rate of the Sc element is increased through the pre-aging technology, premature consumption of the Sc element is avoided, and the actual use cost of the expensive Sc element is reduced.

The invention discloses a Q235G continuous casting billet and a rolling method thereof. In the rolling process, the mass ratio of Mn to S is controlled to be larger than or equal to 8.5. According to the method, the Mn alloy is added in the tapping procedure, and the content of the Mn element in the molten steel is adjusted again according to the content of the S element in the LF refining process, so that the mass ratio of Mn to S reaches that Mn / S is larger than or equal to 8.5, the hot brittleness phenomenon caused by precipitation of low-melting-point FeS at the grain boundary is avoided, the strength, high-temperature plasticity and forging plasticity of the Q235G steel are improved, and the quality of the Q235G steel is improved. And it is guaranteed that the blank has better extensibility and fluidity in the rolling process, and the quality defect that the blank is rolled through in the rolling process is avoided.

This invention discloses a high-elongation aluminum alloy for lightweight automotive components and its preparation method, relating to the field of aluminum alloy material technology. It features a hierarchical porous structure with surface micron-sized closed pores and a core nano-sized through-pore. The Ti and Mn elements synergistically form an Al-Ti-Mn martensitic phase transformation core region with Al, and the Cr element precisely controls the martensitic phase transformation initiation temperature to room temperature, ensuring stable triggering of the austenite-to-martensitic phase transformation and energy absorption during room-temperature collisions. This invention achieves initial impact buffering and gradual collapse energy absorption through a hierarchical porous structure with surface micron-sized closed pores and a core nano-sized through-pore. This dual energy absorption mechanism significantly improves the material's strength-ductility product, far exceeding that of traditional aluminum alloys.

The application discloses a high-elasticity-modulus magnetic memory alloy prepared based on a liquid die forging method and a preparation method thereof, and belongs to the technical field of magnetic memory alloy preparation. 51‑x Ni 25 Ga 24 Gd x , wherein x=0.4-0.6. The preparation method of the high-elasticity-modulus magnetic memory alloy prepared based on the liquid die forging method comprises the following steps: taking nickel powder, manganese powder, gallium powder and gadolinium powder according to atomic percentage, ball-milling and mixing, and then sequentially performing liquid die forging and pressure forming to obtain the high-elasticity-modulus magnetic memory alloy. The application adopts trace rare earth element Gd element to replace Mn element, and adopts a liquid die forging technology to prepare a high-performance magnetic memory alloy. The magnetic memory alloy has the characteristics of high elastic modulus and small brittleness, and solves the problems of large brittleness and low elastic modulus of the existing Mn2NiGa magnetic memory alloy.

This invention relates to the field of steel tensile strength calculation technology, and in particular to a method for calculating the tensile strength of 42CrMo steel used in engineering machinery. The method involves establishing a dimensionless model through data fitting between tensile strength and quenching temperature X1, tempering temperature X2, and the mass percentage of Mn element X3: Y2 = 5404 - 2.12X1 - 4.952X2 + 540X3. This invention can accurately reflect the quantitative relationship between the heat treatment process parameters of 42CrMo steel, especially the tempering temperature, and tensile strength. It can predict tensile strength, enabling engineers to accurately predict the final properties of the material when formulating heat treatment processes, and to actively and accurately control the tensile strength of the material by adjusting process parameters.

The invention provides a heat treatment-free ZL101A aluminum alloy and a preparation method thereof. The heat-treatment-free ZL101A aluminum alloy is prepared from the following components in percentage by mass: 6.5 to 7.5 percent of Si element, 0.2 to 0.4 percent of Mg element, 0.05 to 0.9 percent of Sc element, 0.05 to 0.9 percent of Er element, 0.1 to 0.2 percent of Ti element, less than or equal to 0.1 percent of Mn element, less than or equal to 0.2 percent of Fe element, less than or equal to 0.2 percent of Cu element and the balance of Al element, wherein reinforcing particles are further added into the heat treatment-free ZL101A aluminum alloy, and the mass ratio of the reinforcing particles in the heat treatment-free ZL101A aluminum alloy is 0.1%-3%. According to the heat-treatment-free ZL101A aluminum alloy, the mechanical property of the heat-treatment-free ZL101A aluminum alloy is improved, and the strength and toughness of the heat-treatment-free ZL101A aluminum alloy in a cast state are improved.

The invention relates to the technical field of metal materials, and particularly discloses light-weight high-toughness medium manganese steel and a preparation method and application thereof. The method comprises the following steps: firstly, pre-oxidizing a hot rolled plate in a specific low oxygen partial pressure atmosphere, and forming a compact Al2O3-MnO composite oxide layer which is well combined with a matrix on the surface in situ; and then, in multi-pass warm rolling, synchronous plastic deformation of the oxide layer and the base body can be achieved, and interface stripping is avoided. And finally, in the circulating annealing process, a surface oxide layer serves as a diffusion barrier to inhibit Mn element leakage and enrich the Mn element towards the core, so that the heterogeneous structure with the continuous gradient characteristic is successfully constructed, specifically, the surface layer is superfine martensite, the transition area is an austenite-ferrite double-phase structure, and the core is Mn-rich coarse grain austenite. The gradient tissue enables the material to have high strength, high wear resistance and high plasticity at the same time, and is suitable for medical instruments with comprehensive requirements for mechanical properties, light weight and biocompatibility, such as knee joint tractor fixing braces.