Study on Microstructures and Mechanical Properties of Si-Al-Mn TRIP Steel with Niobium
The microstructure consisting of ferrite, bainite and retained austenite can be obtained through annealing in intercritical region and isothermal treatment in bainite region for low silicon TRIP steel with niobium. Effects of strain rate, Nb contents and isothermally treated temperatures in bainite region on microstructure and mechanical properties of experimental steels have been investigated. The results show that the volume fraction of martensitic transformation of retained austenite increased, tensile strength,elongation and strength-ductility balance increased with strain rate decreasing when strain rates ranging from 10 -2 s -1 to 10 -4 s -1 ; if Nb content was added, retained austenite fraction decreased, however, tensile strength and yield strength were increased. When Nb content was 0.014％, the experimental steel has a high elongation and strength-ductility balance. The experimental steels have higher retained austenite fraction, and good mechanical properties when the isothermally treated temperature in bainite region was 400 ℃.The maximum values of tensile strength, total elongation and strength-ductility balance can reach 739MPa, 38％ and 28082MPa％,respectively.
TRIP strain rate niobium content retained austenite mechanical property
TANG Zhengyou DING Hua DU Linxiu LI Long SONG Dan
College of Materials and Metallurgy, Northeastern University, Shenyang 110004, P. R. China;State Key State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang 110004, P. R. Chin College of Materials and Metallurgy, Northeastern University, Shenyang 110004, P. R. China
国际会议
辽宁
英文
2006-10-21（万方平台首次上网日期，不代表论文的发表时间）