QLT与QT热处理工艺对9Ni低温钢性能的影响  

Influence of QLT and QT heat treatment process on properties of 9Ni steel

作　　者：赵宏禹 刘荣佩[1] 王长军[2] 梁剑雄[2] 胡家齐[2] Zhao Hongyu;Liu Rongpei;Wang Changjun;Liang Jianxiong;Hu Jiaqi(Faeulty of Materials Science and Engineering,Kunming University of Science and Technology,Kunming Yunnan 650093,China;Institute for Special Steel,Central Iron and Steel Research Institute,Beijing 100081,China)

机构地区：[1]昆明理工大学材料科学与工程学院,云南昆明650093 [2]钢铁研究总院特殊钢研究所,北京100081

出　　处：《金属热处理》2018年第12期100-104,共5页Heat Treatment of Metals

基　　金：中国钢研科技集团有限公司青年创新资金

摘　　要：使用Thermo-Calc软件中的TCF8数据库计算出9Ni低温钢奥氏体组元含量和C、Ni元素在奥氏体中的质量分数,采用金相、TEM、XRD观察并测量两种工艺下的回转奥氏体大小、形态、分布及含量。最后通过拉伸试验及冲击试验对力学性能进行了对比。结果表明:相对于QT工艺,QLT工艺处理后的回转奥氏体含量更高,分布更为细小弥散,呈层片状,从而显著提高9Ni低温钢的韧性。The austenite content of 9Ni cryogenic steel and the mass fraction of C and Ni elements in anstenite were calculated by using Thermo-Calc software with TCF8database.The size,shape,distribution and content of reversed austenite under two heat treatment processes were observed and measured by metallography,TEM and XRD.Finally,the mechanical properties were compared by tensile test and impact test.The results show that compared with QT process,the reversed anstenite content is higher and its distribution is finer,more dispersive and layer shape after QLT process,so that the toughness of 9Ni steel is significantly improved.

关 键 词：9Ni低温钢 Thermo—calc软件 回转奥氏体 QLT工艺 QT工艺 性能 

分 类 号：TG156[金属学及工艺—热处理]