圆坯连铸GCr15SiMn的成分偏析和接触疲劳寿命研究  

Composition Segregation and Contact Fatigue Life of GCr15SiMn Fabricated by Round Billet Continuous Casting

作　　者：俞峰 陈兴品[1] 杜松林[3] 王存宇[2] 汪开忠[3] 曹文全[2] Yu Feng;Chen Xingpin;Du Songlin;Wang Cunyu;Wang Kaizhong;Cao Wenquan(College of Materials Science and Engineering,Chongqing University,Chongqing 400044;Central Iron and Steel Research Institute Co.,Ltd.,Beijing 100081;Ma’anshan Iron and Steel Co.,Ltd.,Ma’anshan 243003)

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]钢铁研究总院有限公司,北京100081 [3]马鞍山钢铁股份有限公司,马鞍山243003

出　　处：《特殊钢》2022年第6期13-20,共8页Special Steel

基　　金：国家重点研发计划(2020YFB0311001);自然科学基金(NSFC51871062)。

摘　　要：利用金属原位分析技术和钻孔化学分析方法对高淬透性轴承钢GCr15SiMn的Φ450 mm连铸圆坯和Φ130 mm圆钢的C、Si、Mn、Cr元素横截面的分布情况进行分析。采用推力片式接触疲劳试验机进行了材料的接触疲劳寿命测试。结果表明:GCr15SiMn连铸圆坯C元素的偏析倾向较大,易产生中心正偏析,而Cr、Si、Mn元素的偏析倾向较小。通过采取稳定低过热度浇铸、三段强电磁搅拌等措施,铸坯的中心碳偏析得以改善。采用(1240±20)℃×5 h高温扩散、初轧首道次变形量≥90 mm大变形轧制的Φ130 mm圆钢的碳偏析可以得到进一步的改善,试验钢在5.3GPa高应力负载下的接触疲劳额定寿命L_(10)达到3.58×10^(6)次,接近电渣重熔钢的水平。The distribution of C,Si,Mn and Cr elements in cross sections ofΦ450 mm continuous casting round billet andΦ130 mm round steel of high hardenability bearing steel GCr15SiMn was analyzed by original position statistic distribution analysis(OPA)and borehole chemical analysis.The contact fatigue life of the material was tested by the thrust plate contact fatigue testing machine.The results show that the segregation tendency of C element in bearing steel GCr15SiMn continuous casting round billet is large,and it is easy to produce center positive segregation,while the segregation tendency of Cr,Si and Mn element is small.The central carbon segregation in casting bloom was improved by adopting stable low superheat casting and three-stage strong electromagnetic stirring.After(1240±20)℃×5 h high temperature diffusion and large deformation rolling with primary pass deformation≥90 mm,the carbon segregation ofΦ130 mm round steel can be further improved.The rated contact fatigue life L_(10) of the test steel under 5.3GPa high stress load reaches 3.58×10^(6)times,which is close to the level of ESR steel.

关 键 词：圆坯连铸 高淬透性轴承钢 GCr15SiMn 成分偏析 接触疲劳寿命 

分 类 号：TF777[冶金工程—钢铁冶金] TG142.1[一般工业技术—材料科学与工程]