热处理工艺对Si-Mn-Mo系贝氏体钢组织与性能的影响.pdfVIP

热处理工艺对 Si-Mn-Mo 系贝氏体钢组织与性能的影响 杨 玉 陈 昕 金纪勇 （鞍钢股份有限公司技术中心，鞍山 114009 ） 摘 要 本文主要研究了淬火后不同温度回火对 Si-Mn-Mo 系贝氏体钢显微组织与力学性能的影响。结果表明， 采用淬火后回火的工艺可以显著提高 Si-Mn-Mo 系贝氏体钢的强度和塑性。淬火后 300℃回火与 350℃回火，该钢 的力学性能相差不大，而 450 ℃回火后强度、硬度相对较低，韧塑性略有提高。组织观察表明，该钢为贝氏体铁素 体和残余奥氏体（片状和块状 M-A 岛）的复合组织，适当温度回火可以促进块状M-A 岛分解，增加板条铁素体含 量，提高残余奥氏体的机械稳定性,进而稳定其组织性能。 关键词 贝氏体钢,残余奥氏体,回火 Influence of Quenching and Tempering on Microstructure and Mechanical Property of Si-Mn-Mo Bainite Steel Yang Yu Chen Xin Jin Jiyong ( Technology Center of Angang Steel Co., Ltd., Anshan, 114009) Abstract The influence of quenching and tempering on Microstructure and Mechanical Property of Si-Mn-Mo bainitic steel is studied in laboratory. It is found that strength and plasticity of this steel can be improved through quenching and tempering. Mechanical properties of the bainitic steels through 300℃ or 350 ℃ tempering After quenching is similar. But the strength and hardness is reduced and the elongation reduction of area is slightly improved after 450 ℃ tempering. The microstructure of the bainitic steel is composed of bainitic ferrite and residual austenite. Tempering properly after quenching can accelerate the decomposition of the M-A , so percentage composition of the lath-shaped bainitic ferrite is increased and the stability of residual austenite can be improved.At the same time, the stability of microstructure and mechanical property of this steel is improved. Key words Bainitic Steel ，residual austenite ， tempering 近年来，随着经济的高速发展，高强钢在工程结构、桥梁、耐磨耐冲击构件等方面的需求越来越广泛。 贝氏体钢强度、硬度明显高于铁素体和珠光体钢，因此，国内外很多材料科学工作者致力于贝氏体钢的研究 与开发工作[1]。Irvine 和 Pickering 等人于 20 世纪 50 年代开发出 Mo—B 系贝氏体钢， Mo 价格昂贵，康沫 狂等人在 Mo—B 系贝氏体钢的基础上减少 Mo 的加入量，用价格低廉的Mn 替代 Mo 降低Bs 点，取消 B 并 加入一定量 Si 抑制贝氏体中碳化物析出，开发出 Si-Mn-Mo 系贝氏体钢，也叫准贝氏体钢或无碳化物贝氏 体钢。 对于某