SUJ2轴承钢超长寿命疲劳行为研究

doi:10.11868/j.issn.1001-4381.2016.08.014

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摘要

采用超声疲劳试验机研究SUJ2轴承钢的超长寿命疲劳。结果表明：对于复合氧化物和TiCN裂纹源，裂纹从夹杂物与基体界面处萌生；铁、铬合金碳化物裂纹源则为夹杂物本身开裂。颗粒状亮面（GBF）相对尺寸正比于裂纹源处夹杂物边缘的应力强度因子范围1/ΔK_inc²，对于本实验的SUJ2材料，当ΔK_inc>8MPa·m^1/2时GBF不再形成。通过数据拟合得到了GBF内裂纹扩展规律=（m₁+m₂N_f）^m₀，证实了Paris公式可以用来描述GBF内的裂纹扩展。

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	李永德
	张莉莉
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关键词 ：超长寿命疲劳, 夹杂物, GBF相对尺寸, 裂纹扩展

Abstract：

Ultra-long life fatigue behavior of SUJ2 bearing steel was studied by ultrasonic fatigue testing machine. The results show that, for the crack origin of composite oxide and TiCN, crack initiates from the interface between inclusion and matrix, and for the iron-chromium carbide crack origin, the inclusion itself cracks. The relative GBF(granular bright facet) size is proportional to 1/ΔK_inc². GBF is no longer formed when ΔK_inc>8MPa·m^1/2 for SUJ2 bearing steel. The crack propagation rule in GBF is obtained by data fitting, it is verified that Paris equation which can describe the crack growth in GBF is verified.

Key words： ultra-long life fatigue inclusion relative GBF size crack propagation

收稿日期: 2014-08-14 出版日期: 2016-08-23

中图分类号:

TG142.1

基金资助:国家自然科学基金资助项目(51101094);河北省高等学校科学技术研究重点资助项目(ZD2015045);河北工程大学青年学术骨干基金(HBE-Yooth001);河北工程大学博士专项基金(HBE2014004);河北省自然科学基金(E2015402111)

通讯作者: 李永德 E-mail: ydli@alum.imr.ac.cn

作者简介: 李永德(1981-), 男, 博士, 研究方向:疲劳与断裂及失效分析, 联系地址:河北省邯郸市光明南大街199号河北工程大学(056038), ydli@alum.imr.ac.cn

引用本文:

李永德, 张莉莉, 张冲, 贺莹莹. SUJ2轴承钢超长寿命疲劳行为研究[J]. 材料工程, 2016, 44(8): 85-92.
Yong-de LI, Li-li ZHANG, Chong ZHANG, Ying-ying HE. Ultra-long Life Fatigue Behavior of SUJ2 Bearing Steel. Journal of Materials Engineering, 2016, 44(8): 85-92.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.08.014 或 http://jme.biam.ac.cn/CN/Y2016/V44/I8/85

Table 1 SUJ2轴承钢的化学成分(质量分数／%)

Fig.1 超声疲劳样品尺寸

Fig.2 鱼眼形貌

Fig.3 裂纹源区微观形貌
(a)钙铝镁复合氧化物；(b)TiCN；(c)铁铬合金碳化物；(d)内部基体；(1)左端；(2)右端

Fig.4 断口上夹杂物分布(a)与缺陷尺寸极值统计分布(b)

Fig.5 GBF相对尺寸与ΔK_inc的关系
(a)SUJ2;(b)SUP-QT, SCV-QT和G-QT^[25]; (c)60Si2CrV, 60Si2Cr和60Si2Mn^[26]; (d)TT150^[28]和NSH1^[27]

Fig.6 夹杂物尺寸与ΔK_inc的关系

Fig.7 GBF相对尺寸与疲劳寿命的定量关系及GBF内裂纹扩展规律
(a)不同高强钢的疲劳寿命与GBF相对尺寸的关系; (b)相同氢含量时疲劳寿命与GBF相对尺寸的关系; (c)GBF内裂纹扩展规律; (d)GBF内裂纹扩展示意图

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