30results about How to "Increased yield strength at room temperature" patented technology

The invention belongs to the field of nano-structured metal materials, and specifically related to an (111) texture nano-grade twin crystal Cu block material and a preparation method thereof. The microstructure of the material is composed of columnar crystal grains with sizes of 1-50 micrometers. High-density nano-grade twin crystal lamellar structures are uniformly distributed in the crystal grains. The thicknesses of the twin crystal lamellar structures are 30 nanometers to hundreds of nanometers. The structural characteristics of the material are that: the materials have an (111) texture, columnar crystal grains, and low-angle boundaries; the nano-grade twin crystal lamellar structures and sigma3 coherent twin crystal interfaces are perpendicular to a growth direction; the grain sizes and twin crystal lamellar structures can grow under control; and the strength of the blocks can reach 10 times that of macro-crystal Cu. According to the invention, a direct current electrodeposition technology is adopted, and the technological conditions are slightly changed, wherein an appropriate plating bath composition and appropriate deposition parameters are controlled. According to the invention, performance problems of Cu materials in prior arts can be solved, and a Cu material with excellent performance, high strength, high thermal stability, high conductivity and high plasticity can be obtained.

A nano-class twin-crystal copper material with ultrahigh strength and ultrahigh electric conductivity is prepared by electrolytic deposition technique. The resultant high-purity polycrystal copper material features that its microstructure is composed of nearly equiaxed submicron (300-1000 nm) crystals, and in the crystal there are high-density parallel twin crystal layers with different orientations. Its advantages are high yield strength up to 900 MPa and break strength up to 1086 MPa, and high electric conductivity (1.75+ / - 0.02 X to the power -8 ohm.m).

The invention provides a heat treatment process for simultaneously improving the strength and the plasticity of a magnesium alloy, comprising the following steps of: carrying out solid solution on a magnesium alloy casting ingot prepared by utilizing a semicontinuous casting process at 360-4,000 DEG C, preserving the temperature for 8-12h, carrying out water quenching and cooling to room temperature, then heating the magnesium alloy treated by the technical scheme to 150-2,000 DEG C, ageing, preserving the temperature for 15-30h, and air-cooling to the room temperature. The heat treatment process of the invention can remarkably improve the room temperature yield strength, the tensile strength and the plasticity of the magnesium alloy material and can solve the contradiction of the strength and the plasticity of the magnesium alloy. The magnesium alloy treated by the heat treatment process can provide an important basis for the subsequent high-strength and high-plasticity deformed magnesium alloy and benefits to the full development of the use performance potential of the material. In addition, the invention has the advantages of simple equipment and lower cost and is easy to operate.

The invention discloses an optimization method for hydrogenated TC4 titanium alloy forging technology parameters. The optimization method is used for solving the technical problem that the practicability of a hydrogenated titanium alloy forging technology in the prior art is poor. According to the technical scheme, the optimization method comprises the steps that the flow stress and the strain data of hydrogenated TC4 titanium alloy are obtained through a thermal simulation compressive deformation experiment firstly, and then the value of the strain rate sensitivity index m, the value of the energy dissipation rate eta and the value of the flow instability parameter epsilon are calculated; and the reasonable strain rate range during hydrogenated TC4 titanium alloy forging is determined according to the criterion of the value of the energy dissipation rate eta, then, the reasonable forging temperature range during hydrogenated TC4 titanium alloy forging is determined according to the criterion of the value of the flow instability parameter epsilon, and the reasonable forging temperature and the reasonable strain rate of the hydrogenated TC4 titanium alloy are optimized out. By means of the optimization method for the hydrogenated TC4 titanium alloy forging technology parameters, a TC4 titanium alloy blade with the hydrogen content being 0.4 wt% is forged successfully; compared with the national standards of a TC4 titanium alloy forging blade, the tensile strength at room temperature, the yield strength at the room temperature and the tensile strength at the high temperature of 400 DEG C of the TC4 titanium alloy blade with the hydrogen content being 0.4 wt% are all improved.

The invention relates to an iron-based bulk metallic glass alloy with a large supercooled liquid phase region and belongs to the technical field of novel materials. The iron-based bulk metallic glass alloy with the large supercooled liquid phase region is characterized by consisting of iron, nickel, cobalt, molybdenum, chromium, tungsten, phosphorus, carbon, boron and silicon and having a composition expression of FexNiyCozMoaCrbWcPdCeBfSig, wherein x, y, z, a, b, c, d, e, f and g respectively represent atom percent content of each corresponding component; x is 50 to 70 percent; y is 0 to 20 percent; z is 0 to 15 percent; a is 2 to 6 percent; b is 0 to 4 percent; c is 0 to 3 percent; d is 8 to 15 percent; e is 10 to 12 percent; f is 2 to 6 percent; g is 0 to 2 percent; x+y+z is 50 to 75 percent; a+b+c is 4 to 10 percent; and x+y+z+a+b+c+d+e+f+g is equal to 100 percent. The alloy has the typical composition expression of Fe55Co10Ni5Mo5P10C10B5. The iron-based bulk metallic glass alloy has the effects and the benefits that the alloy simultaneously has the advantages of low glass transition temperature, large supercooled liquid phase interval, high glass-forming ability, low coercive force, excellent mechanical performance, low viscosity coefficient in a cold liquid phase interval and the like, can implement micron-grade and nano-grade superplasticity processing, and is a novel iron-based soft magnetic metallic glass alloy for superplasticity processing, with low production cost.

The invention relates to high-Cr-content cast heading machine cutter steel. The cutter steel comprises the chemical components of, by weight, 0.30%-0.55% of C, 8.0%-12.0% of Cr, 1.2%-3.0% of Mo, 0.5%-1.8% of Ni, 0.6%-1.0% of V, 0.1%-0.4% of Mn, 0.6%-0.8% of Si, 0.04%-0.30% of N, no more than 0.005% of S, no more than 0.03% of P and the balance Fe. The cutter steel manufacturing technique comprisesthe following steps that a near-net shape blank of a cutter is obtained through precise casting, then heat treatment is conducted, and a finished product is obtained directly after fine machining. Yield strength and tensile strength are improved while the hardness, impact toughness and elongation of the cutter steel all can reach the level of domestic forged heading machine cutter steel; the oxidation corrosion resistant capability, thermal fatigue resistant performance and abrasive grain abrasion resistance are improved; and the production period is shortened, and the production cost is reduced.