摘要
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A_3温度并扩大A_3—A_(r3)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.
The effect of A1 partially substituted Si on the microstructure of hot rolled TRIP （transformation induced plasticity）steels with identical contents of C and Mn on the basis of the dynamic transformation of undercooled austenite（DTUA）was investigated by uniaxial hot compression tests in a Gleeble-1500 simulation test machine.The results show that the partial replacement of Si with Al could reduce theγarea in the equilibrium phase diagram,increase the A3 temperature and enlarge the range between A3 and Ar3.In addition,when the Si was partially replaced 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 in the C-Mn-Al-Si steel was more smaller and dispersive,and the carbon content in retained austenite was higher than that in C-Mn-Si steel,but the grains of ferrite were coarser in the C-Mn-Al-Si steel.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第11期1292-1298,共7页
Acta Metallurgica Sinica
基金
国家高技术研究发展计划资助项目2007AA03Z501~~
关键词
热轧TRIP钢
过冷奥氏体动态相变
SI
AL
铁素体转变动力学
残余奥氏体
hot rolled TRIP steel
dynamic transformation of undercooled austenite
Si
Al
transformation kinetics of ferrite
retained austenite
