Bending Fretting Fatigue Characteristics of 30CrNiMo8 Alloy Steel
摘 要
在不同弯曲载荷水平下, 对30CrNiMo8合金钢进行了系统的弯曲微动疲劳试验, 建立了其微动疲劳S-N曲线, 讨论了其弯曲微动疲劳特性及相关规律。结果表明: 30CrNiMo8钢弯曲微动疲劳的S-N曲线明显不同于常规疲劳的, 呈现“C”曲线特征; 随着弯曲载荷的增加, 微动依次运行于部分滑移区、混合区和滑移区; 在混合区, 裂纹最易萌生且微动疲劳寿命最短; 微动损伤区的磨损机制主要为磨粒磨损、氧化磨损和剥层; 弯曲微动疲劳裂纹的扩展表现为三个不同的阶段, 第一阶段裂纹斜向扩展, 以接触应力控制为主, 第二阶段裂纹转向, 受接触应力和弯曲应力共同控制, 第三阶段裂纹扩展方向变为垂直方向, 以弯曲应力控制为主。
Abstract
Bending fretting fatigue tests of 30CrNiMo8 alloy steel were carried out at different bending loads, and the S-N curve of bending fretting fatigue was also built up, then the bending fretting fatigue characteristics and related laws of the steel were discussed. The results show that the S-N curve of the steel presented a shape of "C" curve, which was different from the curve of plain fatigue. With the increase of the bending fatigue loads, the fretting successively run in the partial slip regime (PSR), mixed regime (MR), and slip regime (SR), respectively. In the mixed regime, the cracks initiated most easily and the fatigue life was the lowest. The wear mechanisms in the fretting damage zones were mainly abrasive wear, oxidative wear and delamination. The propagation of the bending fretting fatigue cracks showed three stages, in the first stage, the crack extended obliquely at an angle and was controlled by the contact pressure, the crack turned in the second stage and was controlled by both contact stress and bending stress, and in the third stage, the crack propagated along vertical direction and was controlled by bending stress.
中图分类号 TH117.1
所属栏目 材料性能及其应用
基金项目 国家杰出青年科学基金资助项目(51025519); 教育部创新团队项目(IRT1178)
收稿日期 2013/4/27
修改稿日期 2014/4/29
网络出版日期
作者单位点击查看
备注刘大伟(1987-), 男, 山东淄博人, 硕士研究生。
引用该论文: LIU Da-wei,PENG Jin-fang,TIAN Lai,SONG Chuan,LIU Jian-hua,ZHU Min-hao. Bending Fretting Fatigue Characteristics of 30CrNiMo8 Alloy Steel[J]. Materials for mechancial engineering, 2014, 38(8): 48~52
刘大伟,彭金方,田来,宋川,刘建华,朱旻昊. 30CrNiMo8合金钢的弯曲微动疲劳特性[J]. 机械工程材料, 2014, 38(8): 48~52
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【3】彭志亮, 左华付, 肖先忠. 机车电机转轴及小齿轮轴断裂失效分析[J].机械工程材料,2011,35(6): 93-97.
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【5】PENG J F, SONG C, SHEN M X, et al. An experimental study on bending fretting fatigue characteristics of 316L austenitic stainless steel[J].Tribology International,2011,44(11): 1417-1426.
【6】张明,王珉,左敦稳.45#钢微动疲劳特性的研究[J].南京航空航天大学学报,2002,34(5): 433-435.
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【9】方钦志,孙斌, 梁选森.CrMoV合金钢的微动疲劳实验研究[J].实验力学,2012,27(1): 54-60.
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【11】向学渊,何国求,刘兵,等.高速列车轮轴微动疲劳影响因素概述[J].材料导报, 2009, 23(1): 63-66.
【12】刘兵,何国求,蒋小松,等.轮轴钢LZ50的单轴微动疲劳失效机理[J].同济大学学报,2010, 38(15): 720-724.
【13】孙兵,邓日江,阮鸿芳,等.机车牵引电机转轴材料性能提升研究[J].机车车辆工艺, 2012(3): 4-6.
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