| 圆坯连铸GCr15SiMn的成分偏析和接触疲劳寿命研究 |
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| 引用本文： | 俞峰,陈兴品,杜松林,王存宇,汪开忠,曹文全.圆坯连铸GCr15SiMn的成分偏析和接触疲劳寿命研究[J].特殊钢,2022,43(6):13-20. |
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| 作者姓名： | 俞峰 陈兴品 杜松林 王存宇 汪开忠 曹文全 |
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| 作者单位： | 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 |
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| 基金项目： | 国家重点研发计划(2020YFB0311001)； 自然科学基金(NSFC51871062) |
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| 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L10达到3.58×106次，接近电渣重熔钢的水平。
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| 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 |
| 收稿时间： | 2022-09-18 |
Composition Segregation and Contact Fatigue Life of
GCr15SiMn Fabricated by Round Billet Continuous Casting |
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| Yu Feng,Chen Xingpin,Du Songlin,Wang Cunyu,Wang Kaizhong,Cao Wenquan.Composition Segregation and Contact Fatigue Life of
GCr15SiMn Fabricated by Round Billet Continuous Casting[J].Special Steel,2022,43(6):13-20. |
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| Authors: | Yu Feng Chen Xingpin Du Songlin Wang Cunyu Wang Kaizhong Cao Wenquan |
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| Affiliation: | 1 College of Materials Science and Engineering,Chongqing University,Chongqing 400044;
2 Central Iron and
Steel Research Institute Co.,Ltd.,Beijing100081;
3 Ma'anshan Iron and Steel Co.,Ltd.,Ma'anshan 243003 |
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| Abstract: | The distribution of C,Si,Mn and Cr elements in cross sections of Φ450 mm continuous casting round billet and Φ130 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 con- tact 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 of φ130 mm round steel can be further improved. The rated contact fatigue life L10 of the test steel under 5.3GPa high stress load reaches 3.58×106 times,which is close to the level of ESR steel. |
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| Keywords: | Round Billet Continuous Casting High Hardenability Bearing Steel GCr15SiMn Composition Segregation Contact Fatigue Life |
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