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通过真空熔炼制备出高强韧Fe-20Mn-3Cu-1.3C TWIP钢。针对该合金钢凝固组织中易形成显微缩松的问题,在总热轧压下率相同的条件下,研究了道次平均压下率的变化对消除合金钢微孔缺陷和力学性能的影响。结果表明,随着道次平均压下率由35.96%提高至48.75%,合金内部微孔面密度显著降低,平均晶粒尺寸减小,合金的屈服强度、抗拉强度、强塑积大幅度提高。当道次平均压下率为48.75%时,屈服强度、抗拉强度和伸长率分别为536.70 MPa、1161.49 MPa、95.60%,强塑积高达111038.44 MPa.%,与当道次平均压下率为35.96%时相比,强塑积提高了47.70%,这一结果是目前TWIP钢综合力学性能数据的最高值。表明提高道次平均压下率消除缩松缺陷是提高该TWIP钢力学性能的关键。
High-toughness Fe-20Mn-3Cu-1.3C TWIP steel was prepared by vacuum melting. Aiming at the problem of easy formation of micro-shrinkage in the solidified microstructure of the alloy steel, the effects of the variation of the pass reduction rate on the micro-hole defects and mechanical properties of the alloy steel were studied under the same total hot rolling reduction rate . The results show that with the decrease of pass reduction from 35.96% to 48.75%, the density of micropore surface decreases and the average grain size decreases. The yield strength, tensile strength and strength of the alloy increase greatly . The yield strength, tensile strength and elongation were 536.70 MPa, 1161.49 MPa, 95.60% and 110.1038.44 MPa% respectively when the average reduction rate was 48.75%. The average reduction rate was 35.96% When compared to the strong plastic product increased by 47.70%, the result is the highest TWIP steel mechanical properties of the highest value. It is indicated that increasing the average reduction of the pass rate and eliminating the shrinkage defects is the key to improve the mechanical properties of TWIP steel.