高强度铬-锰钢的热处理工艺及组织和性能研究
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摘要
制备了具有良好热成形性能的高强度铬一锰钢试样,其化学成分为0. 5%C、1.26%Cr、1.66%Mn、0.24%Si(质量分数)。对试样分别进行了不同工艺的热处理:950～1 100℃油冷,从两相区温度淬火,以及奥氏体化后空冷、风冷和油冷。随后检测了试样的显微组织和力学性能。结果表明,钢的奥氏体化温度不应高于950℃两相区淬火的温度,应以780～810℃为宜。此外,与空冷和油冷淬火的钢相比,风冷淬火即以约15℃/s冷速淬火的钢组织为马氏体和少量贝氏体,力学性能最好,抗拉强度达1 570 MPa,屈服强度达1 100 MPa,断后伸长率13.5%,强塑积21.2 GPa·%。
The specimens of high-strength chromium-manganese steel that contains 0. 15% C, 1. 26% Cr, 1. 66%Mn, and 0. 24% Si by mass and has good hot-forming behavior were fabricated, and were oil-quenched from temperatures ranging from 950 to 1 100 ℃, from temperatures in two-phase region, as well as quenched in air,forced air, and oil from austenitizing temperature, respectively. Subsequently, the specimens were tested for microstructure and mechanical property. The results indicated that the steel should not be quenched from temperatures higher than 950 ℃,and austenitizing temperatures in two-phase region of 780 to 810 ℃were suitable.In addition, the steel quenched in forced air at about 15 ℃ per second exhibited microstructure consisting of martensite and a small amount of bainite, and gave the best mechanical properties as compared with the steel quenched in air or oil, reaching tensile strength of 1 570 MPa,yield strength of 1 100 MPa, elongation of 13. 5%,and product of strength by plasticity of 21.2 GPa · %.
The specimens of high-strength chromium-manganese steel that contains 0. 15% C, 1. 26% Cr, 1. 66%Mn, and 0. 24% Si by mass and has good hot-forming behavior were fabricated, and were oil-quenched from temperatures ranging from 950 to 1 100 ℃, from temperatures in two-phase region, as well as quenched in air,forced air, and oil from austenitizing temperature, respectively. Subsequently, the specimens were tested for microstructure and mechanical property. The results indicated that the steel should not be quenched from temperatures higher than 950 ℃,and austenitizing temperatures in two-phase region of 780 to 810 ℃were suitable.In addition, the steel quenched in forced air at about 15 ℃ per second exhibited microstructure consisting of martensite and a small amount of bainite, and gave the best mechanical properties as compared with the steel quenched in air or oil, reaching tensile strength of 1 570 MPa,yield strength of 1 100 MPa, elongation of 13. 5%,and product of strength by plasticity of 21.2 GPa · %.
引文
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