摘要
采用淬火膨胀仪研究了冷却速度对抽油杆用NiCrMnMoV钢连续冷却转变过程中微观组织和硬度的影响,借助EPMA对微观组织的带状结构进行了元素偏析分析,探讨了带状结构形成原因。结果表明:试验钢在0.05~40℃/s较宽的冷速范围内均可以形成贝氏体组织,铁素体/珠光体转变区与贝氏体转变区完全分离,珠光体转变极少;随冷速增加,试验钢微观组织细化,硬度提高;低冷速下,显微组织呈现明显的带状结构,EPMA面扫描结果显示存在明显的元素偏析,随冷速提高,带状结构逐渐消除,冷速过低和合金元素微观偏析是导致带状结构产生的主要原因。
Effect of cooling rates on microstructure and hardness of NiCrMnMoV steel for sucker rod after continuous cooling transformation was studied with quenching dilatometer.Elemental segregation analysis of the band structure of microstructure was carried out by EPMA,and the reason for the formation of band structure was discussed.The results show that the bainite structure can be obtained in the tested steel under a large range of cooling rates from 0.05℃/s to 40℃/s.The transformation zone of ferrite/pearlite and bainite is completely separated,and the pearlite transformation is minimal.With the cooling rate increasing,the microstructure of the tested steel becomes finer,and the hardness increases obviously.The microstructure shows obvious band structure at low cooling rate,the EPMA scanning shows obvious element segregation.As the cooling rate increasing,the band structure gradually disappears.It can be concluded that the low cooling rate and segregation of alloying elements are main reasons for the formation of the band structure.
作者
孙晓冉
丁辉
孙岩
赵楠
海岩
Sun Xiaoran;Ding Hui;Sun Yan;Zhao Nan;Hai Yan(HBIS Group Technology Research Institute,Shijiazhuang Hebei 050000,China;National Center for Materials Service Safety,University of Science and Technoogy Beijing,Beijing 100083,China;HBIS Group Shisteel Company,Shijiazhuang Hebei 050000,China)
出处
《金属热处理》
CAS
CSCD
北大核心
2019年第11期163-166,共4页
Heat Treatment of Metals
作者简介
孙晓冉(1983—),女,高级工程师,硕士,主要从事金属材料物理检测研究,联系电话:13315119272,E-mail:ragyy@126.com。
