热处理工艺对KD级抽油杆用钢组织和性能的影响  

Effect of heat treatment process on microstructure and properties of KD sucker rod steel

作　　者：孙晓冉 郑文跃 Sun Xiaoran;Zheng Wenyue(National Center for Materials Service Safety,University of Science and Technology Beijing,Beijing 100083,China;Hebei Group Technology Research Institute,Shijiazhuang Hebei 050031,China)

机构地区：[1]北京科技大学国家材料服役安全科学中心,北京100083 [2]河钢集团钢研总院,河北石家庄050031

出　　处：《金属热处理》2021年第1期28-31,共4页Heat Treatment of Metals

摘　　要：采用力学、OM、SEM和TEM研究了某KD级抽油杆用试验钢经3种不同的工艺热处理后力学性能及微观组织的变化。结果表明:经室温入炉回火热处理的材料可获得的综合力学性能较好。500℃入炉回火的热处理工艺使材料冲击性能最差,其原因是粒状贝氏体中M+A岛分布不均匀、形状各异且以带尖角的大块状居多,造成应力集中;第二相颗粒析出物的存在使得材料具有较高的强度。Mechanical properties and microstructure of KD grade experimental steel used for sucker rod,after three different heat treatment processes,were studied by means of mechanical properties test,OM,SEM and TEM.The results show that the comprehensive mechanical properties of the material are the best when tempering temperature starts from room temperature.The impact property of the material obtained is worst when tempering temperature starts from 500℃,which is due to the uneven distribution of M+A islands in granular bainite with different shapes,and the majority is large blocks with sharp corners,which results in stress concentration.The second phase precipitates make the material have higher strength.

关 键 词：热处理 力学性能 微观组织 M+A岛 

分 类 号：TG142.41[一般工业技术—材料科学与工程]