回火对Si-Mn-Mo系贝氏体钢组织性能的影响  

Influence of Tempering on Microstructure and Mechanical Property of Si-Mn-Mo Bainite Steel

作　　者：杨玉[1,2] 陈昕[2] 杜振民[1] 金纪勇[2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]鞍钢股份有限公司技术中心,辽宁鞍山114009

出　　处：《钢铁钒钛》2011年第4期63-66,共4页Iron Steel Vanadium Titanium

摘　　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。.The influence of tempering at different temperature on microstructure and mechanical property of Si-Mn-Mo bainitic steel after quenching is studied in laboratory.It is found that strength and plasticity of this steel can be significantly improved through tempering after quenching.Mechanical properties of the bainitic steels tempered at 300 ℃ or 350 ℃after quenching are similar while the strength and hardness is reduced and toughness and plasticity is slightly improved after tempering at 450 ℃.The microstructure of the bainitic steel is composed of bainitic ferrite and residual austenite（flaky and blocky M-A island）.Tempering properly after quenching can accelerate the decomposition of the M-A island,so percentage composition of the bainitic ferrite lath is increased and the stability of residual austenite can be improved.Thus,the stability of microstructure and mechanical property of this steel is improved.

关 键 词：贝氏体钢 回火 残余奥氏体 贝氏体 铁素体 M-A岛 

分 类 号：TG156.5[金属学及工艺—热处理]