稀土对20CrMnTi齿轮钢夹杂物和疲劳性能的影响  

Effect of Rare Earth on Inclusions and Fatigue Properties of 20CrMnTi Gear Steel

作　　者：王利 刘成宝 李浩秋 王毅 孙宗辉 刘春伟 杨超云[3] 付志豪 Wang Li;Liu Chengbao;Li Haoqiu;Wang Yi;Sun Zonghui;Liu Chunwei;Yang Chaoyun;Fu Zhihao(Research Institute of SD Steel,Shandong Iron and Steel Co.,Ltd.,Jinan 271104,China;Laiwu Branch ofShandong Iron and Steel Co.,Ltd.,Jinan 271105,China;Shenyang National Laboratory for Materials Sciences,Institute of Metal REsearch,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]山东钢铁股份有限公司山钢研究院,济南271104 [2]山东钢铁股份有限公司莱芜分公司,济南271105 [3]中国科学院金属研究所沈阳材料科学国家实验室,沈阳110016

出　　处：《特殊钢》2024年第6期117-124,共8页Special Steel

摘　　要：为深入探究稀土(La/Ce)对20CrMnTi齿轮钢中夹杂物和疲劳性能的影响,采取多种分析测试方法对20CrMnTi和加入0.0027%稀土处理后的20CrMnTi-RE齿轮钢中的夹杂物进行分析和表征,并进行超高周疲劳试验,对比分析疲劳性能变化。结果表明,稀土可与齿轮钢中的O反应,形成稀土氧化物,并与其他CaS、MgAl_(2)O_(4)等夹杂物复合共生,成为TiN的形核核心,由CaS-MgAl_(2)O_(4)-(MnS)-TiN的复合相转变为CaS-MgAl_(2)O_(4)-(MnS)-RE_(2)O_(3)^(-)TiN复合相。加入稀土后,20CrMnTi钢中夹杂物数量显著降低,尺寸>30μm的夹杂物基本消失。此外,稀土改善了齿轮钢的抗疲劳性能,在10~7周次,50%的失效概率条件下,加稀土的齿轮钢的疲劳极限比未加稀土的齿轮钢高26.6MPa,具有更优的抗疲劳性能。To deeply investigate the effect of rare earth(La/Ce)on inclusions and fatigue properties of 20CrMnTi gear steel,the inclusions in 20CrMnTi and 20CrMnTi-RE gear steel treated with 0.0027%rare earth were analyzed and characterized by various analytical and testing methods,the change of fatigue property was compared and analyzed.The ultra-high weekly fatigue test was carried out and analyzed the change of fatigue properties.The results show that rare earth can react with O element in gear steel to form rare earth oxides,and co-exist with other inclusions such as CaS and MgAl_(2)O_(4),which become the core of TiN,the complex phase of CaS-MgAl(2)O_(4)-(MnS)-TiN is transformed into the complex phase of CaS-MgAl_(2)O_(4)-(MnS)-RE_(2)O_(3)-TiN.After addition of rare earth,the amount of inclusions in 20CrMnTi steel decreased significantly,and the inclusions with size over 30μm basically disappeared.In addition,rare earth improves the anti-fatigue property of gear steel.The fatigue limit of gear steel with rare earth is 26.6 MPa higher than that of gear steel without rare earth at the condition of 50%failure probability for 107 cycles,with better anti-fatigue performance.

关 键 词：20CrMnTi齿轮钢 稀土 夹杂物变性 疲劳性能 

分 类 号：TF4[冶金工程—钢铁冶金]