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

doi:10.20057/j.1003-8620.2024-00047

Abstract

Abstract: 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 0.002 7% 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 MgAl2O4， which become the core of TiN， the complex phase of CaS-MgAl2O4-（MnS）-TiN is transformed into the complex phase of CaS-MgAl2O4-（MnS）-RE2O3-TiN. After addition of rare earth， the amount of inclusions in 20CrMnTi steel decreased significantly， and the inclusions with size over 30 μm 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.

Key words: 20CrMnTi Gear Steel, Rare Earth, Denaturation of Inclusions, Fatigue Property

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0.002 7%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、MgAl2O4等夹杂物复合共生，成为TiN的形核核心，由CaS-MgAl2O4-（MnS）-TiN的复合相转变为CaS-MgAl2O4-（MnS）-RE2O3-TiN复合相。加入稀土后，20CrMnTi钢中夹杂物数量显著降低，尺寸＞30 μm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107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26.6 MPa，具有更优的抗疲劳性能。

关键词: 20CrMnTi齿轮钢, 稀土, 夹杂物变性, 疲劳性能

CLC Number:

Wang　Li, Liu　Chengbao, Li　Haoqiu, Wang　Yi, Sun　Zonghui, Liu　Chunwei, Yang　Chaoyun, Fu　Zhihao. Effect of Rare Earth on Inclusions and Fatigue Properties of 20CrMnTi Gear Steel[J]. Special Steel, 2024, 45(6): 117-124.

王利, 刘成宝, 李浩秋, 王毅, 孙宗辉, 刘春伟, 杨超云, 付志豪. 稀土对20CrMnTi齿轮钢夹杂物和疲劳性能的影响[J]. 特殊钢, 2024, 45(6): 117-124.

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