摘要
为了改善高压气瓶用34CrMo4钢屈强比较高的问题,分别研究了调质处理(QT)、在浓度为7. 5%PAG水溶性淬火剂中的淬火+回火(Q1T)、亚温淬火+回火(IT)和淬火+亚温淬火+回火(QIT) 4种不同热处理工艺对34CrMo4钢屈强比的影响,以及屈强比与微观组织之间的关系。结果表明:采用QT工艺得到回火索氏体组织,屈强比最高;采用Q1T工艺得到较粗的回火索氏体组织,屈强比较高;采用IT工艺得到回火索氏体+块状及板条状铁素体两相组织,屈强比较低;采用QIT工艺得到回火索氏体+均匀分布的板条铁素体两相组织,屈强比最低。试样的组织为硬相回火索氏体上分布着软相铁素体时,有较低的屈强比。
In order to adress the higher yield ratio issue of 34CrMo4 steel for high pressure gas cylinders,effect of different heat treating processes including quenching and tempering( QT),quenching in 7. 5% PAG aqueous quenchant and tempering( Q1 T),intercritical quenching and tempering( IT) and quenching plus intercritical quenching and tempering( QIT) on yield ratio of the 34 CrMo4 steel were investigated,and the relationship between yield ratio and microstructure was also studied. The results show that after QT process,the microstructure of the tested steel consists of sorbite,and the yield ratio is highest. After Q1T process,the microstructure of the tested steel consists of coarse sorbite,and the yield ratio is higher. After IT process,sorbite with polygonal and lath ferrite as second phase is obtained,and the yield ratio is lower. After QIT process,the microstructure consists of sorbite with even distributed lath ferrite as second phase,and the yield ratio is lowest. Based on the results,the specimen has lower yield ratio when there is a soft phase ferrite distributed on tempered sorbite.
作者
张雨源
杨刚
范俊明
范国金
Zhang Yuyuan;Yang Gang;Fan Junming;Fan Guojin(School of Mechanical Engineering,Sichuan University,Chengdu Sichuan 610065,China;Chengdu Great High Pressure Vessel Co.,Ltd.,Chengdu Sichuan 610400,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2020年第2期125-129,共5页
Heat Treatment of Metals
关键词
34CrMo4钢
屈强比
热处理
显微组织
亚温淬火
34CrMo4 steel
yield ratio
heat treatment
microstructure
intercritical quenching
