退火工艺对高温轴承钢M50钢材晶粒度的影响  

Effect of Annealing Process on Grain Size of High Temperature Bearing Steel M50

作　　者：徐亮 李涛[1] 马永强[1] 周琦 白平平 Xu Liang;Li Tao;Ma Yongqiang;Zhou Qi;Bai Pingping(Technology Center of Fushun Special Steel Co.,Ltd.,Fushun 113001)

机构地区：[1]抚顺特殊钢股份有限公司技术中心,抚顺113001

出　　处：《特殊钢》2022年第6期50-53,共4页Special Steel

摘　　要：晶粒度大小是衡量M50轴承钢质量的重要指标,通过探讨退火工艺对M50钢晶粒度级别的影响,以期改善实际生产过程中高温轴承钢M50钢材晶粒粗大、混晶问题。试验结果表明,适当提高退火温度、延长保温时间不会对M50钢晶粒度级别造成不利影响。实际生产中进行验证,退火工艺由860℃下保温5 h变更为910℃下保温8 h,可以改善因炉温均匀性差造成的M50钢材晶粒粗大及混晶等问题。另外,验证了当退火保温后的冷却速度过快,容易造成成品轴承淬火晶粒粗大,在实际生产过程中应予以关注。Grain size is an important index to measure the quality of M50 bearing steel.By discussing the effect of annealing process on the grain size of M50 steel,in order to improve the coarse grain size and mixed grain of high temperature bearing steel M50 in the actual production process.The test results show that the grain size of M50 steel is not affected by appropriately increasing the annealing temperature and extending the holding time.It has been verified in actual production that the annealing process is changed from holding heat at 860℃for 5 h to holding heat at 910℃for 8 h,which can improve the grain size and mixed crystal of M50 steel caused by insufficient uniformity of furnace temperature.In addition,it is verified that when the cooling rate is too fast after annealing and heat preservation,it is easy to cause coarse quenched grain of the finished bearing,which should be paid attention to in the actual production process.

关 键 词：晶粒度 混晶 退火 温度 时间 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG156.2[金属学及工艺—金属材料]