48results about How to "Low critical cooling rate" patented technology

The invention relates to a galvanization-free high-strength and plasticity cold-rolled stainless steel plate for an automobile and a manufacturing method of the galvanization-free high-strength and plasticity cold-rolled stainless steel plate, and belongs to the technical field of metallurgy. The galvanization-free high-strength and plasticity cold-rolled stainless steel plate comprises, by weight, 11.0-17.0% of Cr, 0.01-0.12% of C, 0.2-0.5% of Mn, 0.2-1.1% of Si, 0.005-0.5% of Al, less than 0.3% of Ni, less than 0.2% of Nb, less than 0.2% of Ti, less than 0.2% of V, less than 0.1% of Mo, less than 0.03% of Cu, less than 0.05% of N, less than 0.003% of S and the balance Fe. The manufacturing method of the galvanization-free high-strength and plasticity cold-rolled stainless steel plate comprises the steps of casting, heat rolling, cold rolling and heat treatment based on the quenching-partition (Q&P) technology. According to the galvanization-free high-strength and plasticity cold-rolled stainless steel plate, the process of surface galvanization is omitted, the material cost is obviously lower than that of austenitic stainless steel, texture comprises martensite, retained austenite and selectable ferrite, good strength and plasticity are combined, and the galvanization-free high-strength and plasticity cold-rolled stainless steel plate is especially suitable for structural parts, strengthening parts and the like for manufacturing automobiles.

The invention relates to a zirconium-based amorphous alloy. The zirconium-based amorphous alloy comprises zirconium, copper, nickel, aluminum and sliver; and the zirconium-based amorphous alloy is shown by the following formula: Zr70-xCu12.5Ni10Al7.5Agx, wherein x is more than or equal to 1 and less than or equal to 10. The preparation method comprises the steps of replacing zirconium element by a silver part, and melting by arc under vacuum, and then carrying out suction casting, so as to obtain the zirconium-based amorphous alloy. The zirconium-based amorphous alloy is excellent in plastic deformation capacity and high in strength; the amorphous alloy is high in glass transition temperature and initial crystallizing temperature, and wide in sub-cooled liquid phase area, and has a potential application prospect.

Disclosed is a Fe-based bulk amorphous alloy composition which forms a bulk amorphous substance due to its excellent amorphous formability when it is cooled to a temperature lower than its glass transition temperature from the liquid state at a relatively low cooling rate of 1000 K/s or less, has high warm processability in a low temperature range owing to its supercooled liquid region of 20K or higher and has excellent fluidity in the liquid state and thereby good castability. The Fe-based multi-element bulk amorphous alloy composition is represented by a formula of Fe_α, C_βSi_γB_xP_yM_a, in which M is at least one element selected from Ti (titanium), Cr (chromium), Mo (molybdenum), Nb (niobium), Zr (Zirconium), Ta (tantalum), W (tungsten) and V (vanadium), α, β, γ, x, y, and a each represent atomic % of iron (Fe), Carbon (C), silicon (Si), boron (B), phosphorus (P) and the selected metal element, in which α is 100-(β+γ+x+y+a) atomic %, β is 6 atomic % or more and 13 atomic % or less, γ is 1 atomic % or more and 5 atomic % or less, x is 4.5 atomic % or more and 9.5 atomic % or less, y is 3 atomic % or more and 10 atomic % or less and a is 0.1 atomic % or more and 6 atomic % or less.

The invention discloses double-phase steel and a production method thereof. The double-phase steel comprises the following components in percentage by mass: not more than 0.12 percent of C, not less than 0.40 percent of Si, not more than 2.50 percent of Mn, not more than 0.020 percent of P, not more than 0.010 percent of S and not more than 0.030 percent of Nb. The production method comprises the following steps of: pretreatment of molten iron, smelting in a converter, fine adjustment of alloys, treatment in an LF (ladle furnace), continuous casting, hot continuous rolling, acid-washing and cold-rolling, and continuous annealing, wherein in the continuous annealing step, an N2-H2 mixed gas in which H2 accounts for 5-35 percent is used for cooling, the heating temperature T1 is 760-840 DEG C, the slow cooling temperature T2 is 640-670 DEG C and the overaging temperature T3 is 300-320 DEG C. The double-phase steel disclosed by the invention is good in surface quality.

The invention discloses thulium-based metal glass, a preparation method and an application thereof. Based on thulium as the major component, the formula of the thulium-based metal glass is shown in a formula (I), RE represents one or more rare earth elements selected from Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho and Er; T represents Co or Ni; a, b, c and d represent atomic percents of elements, wherein a is greater than or equal to 30 and less than or equal to 60, b is greater than or equal to 5 and less than or equal to 30, c is greater than or equal to 20 and less than or equal to 25, d is greater than or equal to 15 and less than or equal to 25, (a+b) is greater than or equal to 50 and less than or equal to 60, and (a+b+c+d) is equal to 100. According to the thulium-based metal glass disclosed by the invention, on the one hand, the amorphous forming ability can be modulated by changing RE and T, and on the other hand, the temperature interval of the thulium-based metal glass on magnetic transformation can be modulated to expand the magnetic transformation area, so that the thulium-based metal glass has great magnetocaloric effect in a wider temperature interval. TmaREbALcTd(I).

The invention relates to a zinc-based massive amorphous alloy and application thereof. Zinc is a main component of the alloy, and the composition of the alloy is represented by the following formula: ZnaMgbCacYbdXe, wherein subscripts represent atom ratios (molar ratios), a is more than or equal to 36 and less than or equal to 60, b is larger than or equal to 9 and less than or equal to 15, c is larger than or equal to 5 and less than or equal to 39, d is larger than or equal to 0 and less than or equal to 19, e is more than or equal to 0 and less than or equal to 25, and a+b+c+d+e=100; and the element X is one or more elements selected from Sr, Ba, La, Ce, Pr, Nd, Sm, Sc, Li, Ga, Sn, Ni, Cu, Ag and Al. The alloy contains at least 50% of amorphous phase in volume percent. Because of good inoxidability, low cost, low glass transformation temperature, wide supercooling liquid phase zone and the like, the alloy is extremely suitable for micro-nano scale formation.

The invention discloses a polymeric electrolyte membrane fuel cell bulk metallic glass bipolar plate and a manufacturing method thereof. Materials are prepared according to a required atomic moore proportion of a composition formula, namely Zr60-xNbxCu20Al10Ni10 (x is equal to a value ranging from 0 to 20). A mother alloy ingot is smelted by electric arc under the protection of argon; and the mother alloy ingot is re-smelted for at least three times, so that the chemical uniformity can be guaranteed. Current of a vacuum electric arc furnace is 150 to 250 amperes; and a zirconium-base bulk metallic glass plate with a thickness of between 0.1 and 3 millimeters is cast and formed by a Cu die. The purity of elements, namely Zr, Nb, Cu, Ni and Al is more than or equal to 99.95 weight percent; the zirconium-base bulk metallic glass at least contains 95 vol percent of amorphous phase; a corrosion speed is lower than 16 mu A per square centimeters; and the conductivity is more than 5,000 S per centimeters. The polymeric electrolyte membrane fuel cell bulk metallic glass bipolar plate has higher conductivity and high corrosion resistance, and the cost can be reduced greatly; and the polymeric electrolyte membrane fuel cell bulk metallic glass bipolar plate can be applied to the field of manufacturing of fuel cells.

The invention relates to a hot isostatic pressing treatment process method for a casting forming ZL101A aluminum alloy, belongs to the technical field of aluminum alloy casting and heat treatment, andsolves the problems that defects exist in a casting forming ZL101A aluminum alloy material, the fatigue performance of the material is affected, the heat treatment is carried out separately after hotisostatic pressing, many production processes are needed, and the period is long in the prior art. The hot isostatic pressing treatment process method for the casting forming ZL101A aluminum alloy comprises the following steps of step 1, casting ZL101A aluminum alloy castings; and step 2, carrying out hot isostatic pressing treatment on the ZL101A aluminum alloy castings in hot isostatic pressingequipment, wherein the step of carrying out hot isostatic pressing treatment comprises the steps of sequentially carrying out heating and boosting, high-temperature-segment heat preservation and pressure maintaining, pressure maintaining and quick cooling, low-temperature-segment heat preservation and pressure maintaining and cooling and depressurization. According to the method, the improvementof the strength and the anti-fatigue mechanical property of the ZL101A aluminum alloy material is realized, the production cycle of the conventional hot isostatic pressing treatment casting aluminum alloy is shortened, and the production cost is saved.

The invention provides a preparation method of Mg-Li matrix Mg-Li-Cu-Ni-Y series bulk amorphous alloy. The method comprises the following steps: mixing high purity magnesium block, lithium block, nickel block, high purity copper ingot and high purity yttrium block according to a nominal formulation-Mg65LixCu20-xNi5Y10 (0<x<5at.%), wherein firstly smelting by using the vacuum induction melting method to obtain Cu-Ni-Y ternary alloy, secondly polishing the Cu-Ni-Y alloy, grinding the alloy to mix with magnesium block and lithium block and then using the same smelting method to prepare Mg-Li-Cu-Ni-Y quinary master alloy; and (2) after grinding the Mg-Li-Cu-Ni-Y quinary master alloy prepared by smelting, and performing vacuum rapid quenching on an ultrafast quenching device to prepare the high-strength Mg-Li matrix Mg-Li-Cu-Ni-Y series bulk amorphous alloy. The preparation method of the invention avoids large ignition loss of Mg and Li and impurity elements and increases the purity of the amorphous alloy, and the obtained Mg-Li matrix amorphous alloy has high strength, low density and good corrosion resistance.

The massive amorphous magnesium-base alloy has Mg as main component and proper amount of RE element, and contains at least 50 vol% of amorphous phase. It has composition of Mg100-b-cMb[R1-aYa]c, where an is 0-1, b is 0-31, and c is 5-21. The preparation process of the alloy includes mixing and smelting M and R components in arc furnace with Ti adsorbed Ar to obtain binary alloy ingot; smelting the crushed binary alloy and Mg lump in an inducing furnace with 0.01 atm Ar filled for 2-5 min to obtain the main alloy ingot; and re-smelting the main alloy ingot in air atmosphere and casting in metal mold to obtain the alloy. The alloy has high glass-forming capacity and high crystallization inhibiting ability, and may have great size obtained at low cooling rate.

This invention refers to a kind of Gd big amorphous alloy, whose main component is Gd. It also contains at least 50% by volume of amorphous phase, and its composition can be indicated by the formula below: GdaAlbNicCudMe. (50<=a<=80, 5<=b<=20, 5<=c<=20, 5<=d<=20, 0<=e<=15, a+b+c+d+e=100). The transitional subgroup metal element M said above is Sc, Nb, Ti, Cr, Mn, Fe, Co, Y, La, Pr, Nd or Hf. The alloy is made in arc furnace of argon atmosphere, and the argon is adsorbed by Ti. The components said above are melted in the arc furnace to get mother alloy cast ingot. Then the conventional metal casting method is used to molt the mother alloy cast ingot. After that, we use the inspiring-and-casting device in the arc furnace to inspire the bath into the water-cooling copper mould. At last, the alloy comes out. This alloy has the strong ability to suppress crystallization, so it is easy to form big amorphous alloy. Besides, it is easy to make and costs little. Also, the alloy has good magnetic performance and magneto-optic performance, so it can be used as function material.

The invention relates to a lutetium-based block amorphous alloy which takes lutetium as major components and contains at least 50 percent of amorphous phase according to percentages by volume, and the components of the lutetium-based block amorphous alloy are shown as in a formula I, wherein X is zirconium or/and yttrium, a is larger than or equal to 20 and less than or equal to 60, b is larger than or equal to 0 and less than 30, c is larger than or equal to 20 and less than 30, d is larger than or equal to 10 and less than 30, and in addition, a plus b plus c plus c plus d equals 100. A preparation method of the lutetium-based block amorphous alloy comprises the following steps: the components are molten according to required atomic proportions in an electric arc furnace with titanium-absorption argon atmosphere to obtain a master alloy cast ingot; the master alloy cast ingot is remolten by a conventional metal mold casting method, and melts are sucked into a water-cooling copper mould by a suction casting device in the electric arc furnace to obtain the lutetium-based block amorphous alloy. The invention has strong crystallization-inhibited capacity, simple preparation and lower cost and is easy to form large-size amorphous alloy. And the formula I is LuaXbAlcCod.

The invention relates to an aluminum rich bulk amorphous alloy which comprises Al[a]La[b]X[c]Ni[d]M[e], wherein X is cerium, yttrium, gadolinium or a combination thereof, M is cobalt or copper, a is larger than or equal to 35 but less than or equal to 40, b is larger than or equal to 30 but less than or equal to 55, c is larger than or equal to 0 but less than or equal to 20, d is larger than or equal to 5 but less than or equal to 15, e is larger than or equal to 0 but less than or equal to 10, and the sum of a, b, c, d and e is 100. The invention relates to another aluminum rich bulk amorphous alloy which comprises Al35Gd[f]Er[50-f]Co15, wherein f is larger than or equal to 0 but less than or equal to 22. The invention also relates to the preparation method of the aluminum rich bulk amorphous alloy, which comprises the following steps: preparing each metal ingredient according to the required ratio, smelting, cooling, cracking, remelting and suction-casting. The sizes of the aluminumrich bulk amorphous alloy provided by the invention are not less than 1mm in all dimensions, the aluminum rich bulk amorphous alloy has a high glass forming ability, the crystallization temperature is between about 590K and 680K, the glass transformation temperature is between 530K and 640K, and the width of a supercooled liquid phase region is between 35K and 70K.

The present invention relates to a terbium base alloy, using terbium as main constituent. It is composed of TbaCobAlc or TbdCoeAlfYgMh; said M being transition group metallic element Sc, Nb, Ti, Cr, Mn, Fe, La, Pr, Ce or Nd..Every dimensionality of said terbium base bulk amorphous alloy dimension is not less than one mm, cut-off diameter not less than 3mm, having high glass forming ability, crystallization temperature at 650-700 k, glass transition temperature at 600-650 k,supercooling liquid field width at 25-75 k; having good magnetic characteristics and magnetostrictive property.