摘要
轴承钢制造企业不仅需要关注自身产品的检验质量,更需要关心产品在下游用户和终端用户的使用质量。疲劳寿命是轴承钢使用性能较为有效的评价指标。兴澄特钢的滚动接触疲劳(RCF)和旋转弯曲疲劳(RBF)试验结果显示,夹杂物是影响高碳轴承钢疲劳失效的主要因素,钢中夹杂物的尺寸增加和偏析引起的夹杂物在中心的偏聚,会加速轴承钢使用的疲劳失效。通过浇铸钢水过热度控制并与轻压下工艺相匹配,可以改善连铸钢中心缺陷,降低因中心缺陷遗传导致的钢材使用疲劳失效概率。通过改变中间包形状优化浇铸过程钢水的流动,减少了钢中对轴承钢疲劳破坏敏感性强的B类和DS类夹杂数量和全氧含量,也减少了夹杂物总数量,有利于提升轴承钢的疲劳寿命。通过改善轴承钢纯净度和成分均匀性提高轴承钢疲劳寿命,仍然是兴澄特钢今后很长时间内的主要工作方向。
Bearing steel manufacturers should pay attention not only to the inspection quality of their own products,but also to steel application experience of the downstream users and end users.Fatigue life is a more effective evaluation index for the performance of bearing steel.The rolling contact fatigue(RCF)and rotating bending fatigue(RBF)test results of bearing steels produces by Jiangyin Xingcheng Special Steel(JYXC)showed that inclusions were main factors affecting fatigue life of high carbon bearing steel.Increase of inclusion size in steel and aggregation of inclusions in the center caused by segregation would accelerate fatigue failure.By controlling casting liquid steel superheat and matching with soft reduction process,central defect of continuous casting steel could be improved,and probability of fatigue failure of steel due to the heredity of center segregation could be reduced.By changing the shape of tundish to optimize liquid steel flow during pouring process,number of B and DS type inclusions and total oxygen content in steel that were sensitive to fatigue damage of bearing steel were decreased,and total number of inclusions was also reduced,which was conducive to improving steel fatigue life.It is still main work direction of JYXC for a long time in the future to improve steel cleanliness and homogeneity in steelmaking process for improving bearing steel fatigue life.
作者
刘吉刚
许晓红
LIU Ji-gang;XU Xiao-hong(Steel Research Institute,Jiangyin Xingcheng Special Steel Co.,Ltd.,Jiangyin 214400,Jiangsu,China;Jiangyin Xingcheng Special Steel Co.,Ltd.,Jiangyin 214400,Jiangsu,China)
出处
《中国冶金》
CAS
北大核心
2020年第9期75-82,共8页
China Metallurgy
关键词
高碳轴承钢
疲劳寿命
夹杂物
纯净度
偏析
high carbon bearing steel
fatigue life
inclusion
steel cleanliness
segregation
