60Si2Mn钢的低周拉扭复合微动疲劳特性

材料研究学报

2010, Vol. 24

Issue (1): 61-68

研究论文

本期目录 | 过刊浏览

60Si2Mn钢的低周拉扭复合微动疲劳特性

刘兵¹; 何国求¹; 蒋小松¹; 向学渊¹; 胡正飞¹; 朱昊²

1.同济大学材料科学与工程学院~上海市金属功能材料开发应用重点实验室上海 200092
2.西南交通大学牵引动力国家重点实验室成都 610031

The Low Cycle Tensile-torsion Fretting Fatigue Properties of 60Si2Mn Steel

LIU Bing¹; HE Guoqiu¹; JIANG Xiaosong¹; XIANG Xueyuan¹; HU Zhengfei¹; ZHU Minhao²

1.Shanghai Key Laboratory for R&D and Application of Metallic Functional Materials; School of Materials Science and Engineering; Tongji University; Shanghai 200092
2.National Power Traction Key Laboratory; Southwest Jiaotong University; Chengdu 610031

引用本文:

刘兵何国求蒋小松向学渊胡正飞朱昊. 60Si2Mn钢的低周拉扭复合微动疲劳特性[J]. 材料研究学报, 2010, 24(1): 61-68.
. The Low Cycle Tensile-torsion Fretting Fatigue Properties of 60Si2Mn Steel[J]. Chin J Mater Res, 2010, 24(1): 61-68.

全文: PDF(1305 KB)

摘要:

测量60Si2Mn钢在拉扭复合载荷作用下的低周微动疲劳特性, 研究了不同轴向循环拉伸应力幅值对微动疲劳寿命、循环软化特性以及摩擦磨损表面和断口形貌的影响。结果表明, 随着循环拉伸应力幅值的提高, 60Si2Mn钢的微动疲劳寿命降低幅度不同, 发生循环软化的时期不断提前, 完成循环软化的疲劳周期也不断缩短。同时, 微动摩擦副产生的氧化物磨屑对微动磨损性能有重要影响, 在疲劳前期加剧摩擦磨损, 在疲劳后期减轻摩擦磨损。微动疲劳裂纹源形成于试样发生微动摩擦磨损的表面, 并出现疲劳台阶。在扭矩产生的切向剪切应力作用下, 疲劳裂纹沿着与轴向45^o角的方向扩展, 最终在断口上留下显著的舌状凸起, 拉应力的幅值越大舌状凸起越明显。

关键词 ：金属材料 , 微动疲劳 , , 疲劳寿命 , , 循环软化 , , 断口形貌分析

Abstract：

The low cycle fretting fatigue properties of 60Si2Mn were investigated in the condition of tensile-torsion multi-axial loading. The results showed that the tensile stress amplitude affect the fretting fatigue performance significantly. With the tensile stress amplitude increasing, the fretting fatigue life reduced nonlinearly, and the cycle softening occurred earlier and completed in less cycles. Oxide wear debris generated on the fretting wear scars have a significant impact on fretting fatigue, which exacerbated fretting wear in the early-stage of fatigue, and eased the wear later. Fretting fatigue crack initialed on the fretting wear scars, propagated along 45^o angle to the axial direction at the existence of tangential shear stress, and eventually left tongue shape protrusion significantly at fracture. The greater the tensile stress amplitude, the bigger the tongue protrusion.

收稿日期: 2009-04-30

基金资助:

国家九七三计划2007CB714704、国家自然科学基金50771073及教育部“新世纪优秀人才支持计划” NCET-05-0388资助项目。

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