保温时间对轴承钢中碳化物溶解和贝氏体相变的影响  

Effect of holding time on carbide dissolution and bainite transformation of bearing steel

作　　者：吴冰冰 王庆香 刘晓明 邢云翔 许荣昌 李辉 Wu Bingbing;Wang Qingxiang;Liu Xiaoming;Xing Yunxiang;Xu Rongchang;Li Hui(School of Materials Science and Engineering,Shandong University of Technology,Zibo Shandong 255000,China;Linqing Yulian Bearing Technology Co.,Ltd.,Liaocheng Shandong 252000,China;Shandong Zhilian Community Bearing Technology Co.,Ltd.,Liaocheng Shandong 252000,China;Shangang Research Institute,Shandong Iron and Steel Co.,Ltd.,Jinan Shandong 271100,China)

机构地区：[1]山东理工大学材料科学与工程学院,山东淄博255000 [2]临清宇联轴承科技有限公司,山东聊城252000 [3]山东智连共同体轴承科技有限公司,山东聊城252000 [4]山东钢铁股份有限公司山钢研究院,山东济南271100

出　　处：《金属热处理》2023年第11期191-195,共5页Heat Treatment of Metals

基　　金：山东省轴承智能制造创新创业共同体。

摘　　要：采用扫描电镜和Nano Measurer 1.2、Image J图像软件,对860℃不同两相区保温时间下的GCr15轴承钢中的碳化物尺寸、体积分数等进行了研究,并利用维氏显微硬度计进行了硬度测定;并利用DIL热膨胀仪及扫描电镜对经过不同两相区保温时间及不同贝氏体等温时间处理的轴承钢中的贝氏体相变进行了分析。结果表明,在860℃下,两相区保温时间越长,碳化物溶解量越多,硬度增加幅度越大,并且碳化物尺寸、体积分数明显减少。随两相区保温时间的延长,碳化物溶解越多,使得奥氏体中的C/Cr含量越趋于稳定、均匀,贝氏体转变孕育期延长,最佳两相区保温时间为30 min。贝氏体等温处理时间越长,贝氏体相变比例越大。Size and volume fraction of carbides in the GCr15 bearing steel at 860℃for different holding time in two-phase region were studied by means of scanning electron microscope,Nano Measure 1.2 and Image J image software.The hardness was measured using a Vickers microhardness tester.And the bainitic transformation in bearing steel treated under different two-phase region holding time and different bainitic isothermal time was analyzed using DIL thermal expansion instrument and scanning electron microscope.The results show that at 860℃,the longer the holding time in two-phase region,the more carbides are dissolved,the greater the increase in hardness,and the size and volume fraction of carbides are significantly reduced.As the holding time in the two-phase region increases,the more carbides dissolve,the more stable and uniform C/Cr content in austenite becomes,and the bainite transformation incubation period extends.The optimal holding time in two-phase region is 30 min.The longer the bainitic isothermal treatment time,the greater the proportion of bainite transformation.

关 键 词：保温时间 轴承钢 碳化物 贝氏体相变 

分 类 号：TG156[金属学及工艺—热处理]