通过Gleeble-1500热模拟单轴压缩实验, 研究了Al部分替代Si对热轧TRIP钢过冷 奥氏体动态相变特征、组织控制及残余奥氏体的影响. 结果表明: 用Al替代C-Mn-Si钢中 的部分Si后可缩小平衡相图中的γ相区, 提高钢的A3温度并扩大A3-A3温度范围; 动态相变时铁素体相变动力学提前, 最佳贝氏体等温相变温度升高; 组织中残余奥氏体具有较高的C含量, 颗粒状残余奥氏体分布更为细小和弥散, 但铁素体晶粒尺寸较C-Mn-Si钢的粗大.
Abstract: The effect of Al partial substituted Si on the microstructure of the hot rolling TRIP (transformation induced plasticity) steels with identical contents of C and Mn on the basis of the dynamic transformation for undercooled austentie (DTUA) was investigated by uniaxial hot compression tests on a Gleeble1500 simulation test machine. The effects of Al on the characters of DTUA, the evolution of microstructure and retained austenite have been studied. The results showed that the partial replacement of Si with Al could reduce the γ area in the equilibrium phase diagram, increase the A3 temperature and enlarge the range between A3 and Ar3. In addition, when the Si was partial replacement by Al, the kinetics of ferrite transformation during DTUA was accelerated and the optimum isothermal bainitic temperature was increased when the isothermal treatment was implemented. Moreover the granular retained austenite of C--Mn--Al--Si steel was more smaller and dispersion and the carbon content of retained austenite was higher than the C--Mn--Si steel, but the grain size of ferrite was coarser than the latter.
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