高温变形后的停留处理对不含铌、钛元素超低碳钢中温相变的影响  

Effect of Staying Treatment after High-Temperature Deformation on Intermediate-Temperature Phase Transformation of Ultra-low Carbon Steel without Nb and Ti Elements

作　　者：王芳[1] 张传峰 李娜[1] 刘庆锁[1] 

机构地区：[1]天津理工大学材料科学与工程学院,天津300384 [2]洛阳天浩泰轨道装备制造有限公司,洛阳471002

出　　处：《机械工程材料》2017年第8期93-97,101,共6页Materials For Mechanical Engineering

基　　金：天津市科技支撑重大项目(11ZCKFGX205000)

摘　　要：将Fe-0.05C-1.3Mn-0.35Ni-0.3Si-0.25Mo超低碳钢在850℃压缩变形后,分别进行了高温停留+直接冷却、高温停留+等温、直接等温和直接冷却等4种处理,研究了不同方式处理后试验钢的物相组成、显微组织和硬度,分析了高温停留对该钢中温相变的影响。结果表明:与直接冷却处理相比,高温停留使试验钢的中温相变易于发生和进行,且钢的硬度水平较高;高温停留处理使变形形成的位错纠缠变成位错胞结构,有利于束状贝氏体的形成,致使试验钢的硬度提高。The Fe-0.05C-1.3Mn-0.35Ni-0.3Si-0.25Mo ultra-low carbon steel was compression deformed at 850 ℃,and then treated by 4 different ways of high-temperature staying＋direct cooling,hightemperature staying＋isothermal treating,direct isothermal treating and direct cooling,respectively.The phase composition,microstructure and hardness of the tested steel after different treatments were studied,and the influence of high-temperature staying on the intermediate-temperature phase transformation characteristic of the steel was analyzed.The results show that comparing to the direct cooling treatment,the intermediate-temperature phase transformation of the tested steel occurred and continued more easily due to the high-temperature staying and the hardness of the steel was relatively high.The high-temperature staying treatment transformed the dislocation entanglement produced during the deformation into the dislocation cell structure,which was benefiting for the formation of sheaf-like bainite,resulting in the increase of hardness of the tested steel.

关 键 词：超低碳钢 高温停留 显微组织 硬度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]