低碳马氏体非调质钢中残余奥氏体的研究
Research on Retained Austenite in Low-carbon Non-quenched-tempered Martensite Steel
李炜新
点击：3240次 下载：0次
作者单位：(廊坊职业技术学院 机械工程系, 河北 廊坊 065000)
中文关键字：残余奥氏体； 非调质钢； 马氏体； 热稳定性
英文关键字：retained austenite; non-quenched and tempered steel; martensite; thermal stability
中文摘要：残余奥氏体是非稳定的韧性相，其分布状态、含量以及稳定性对低碳马氏体非调质钢的性能具有重要的影响。 对成分在0.1%～0.2%C、3.0%～3.5%Mn、1.6%～1.8%Si和0.5%～0.6%Cr的三种钢的显微组织和力学性能进行分析测定。结果发现：随碳含量的增加，残余奥氏体含量由2.6%增至8.6%，且具有很高的热稳定性，造成低碳马氏体非调质钢能够在保持高强度(σb>1380 MPa)的同时具有很好的塑性(δ5>12%)。
英文摘要：The retained austenite is an unstable toughness phase, whose distribution, content and stability have an important effect on the mechanical properties of low-carbon non-quenched-tempered martensitic steel. The microstructure and mechanical properties of three kinds of steel within the composition range of 3.0%～3.5%Mn, 1.6%～1.8%Si 0.5%～0.6%Cr, and 0.1%～0.2%C were studied. The results show that the amount of the retained austenite increases from 2.6% to 8.6% with the increase of the amount of carbon, and it has high thermal stability, so the low-carbon non-quenched-tempered martensitic steel possess very high strength (σb>1380 MPa) as well as good plasticity (δ5>12%).