二次孔挤压强化对TB6钛合金疲劳性能的影响
Effect of Double Cold Expansion of Hole on Fatigue Property of TB6 Titanium Alloy
查看参考文献16篇
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文摘
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为了提高TB6钛合金耳片孔的疲劳抗力,研究二次孔挤压强化对TB6钛合金耳片孔试样疲劳寿命的影响,采用扫描电镜、粗糙度仪、X射线衍射仪、显微硬度计及金相显微镜等仪器对孔壁表面完整性进行分析,探讨二次孔挤压强化对疲劳寿命的增益机制。结果表明:相比过盈配合试样,二次孔挤压强化耳片孔试样的轴向拉伸疲劳寿命显著提高;经二次孔挤压强化后,孔壁表面完整性得到了显著改善;孔壁表面粗糙度显著下降;表层晶粒组织发生了明显的塑性变形;显微硬度显著提高;形成了较深的残余压应力场和组织强化层;孔壁表面完整性的改善对微动疲劳寿命的增益具有重要作用。 |
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其他语种文摘
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To improve the fatigue resistance of the bolt connecting hole,the effect of double cold expansion (DCE) of the hole on the fatigue life of TB6 titanium alloy was investigated. The fatigue fracture,surface roughness,residual stress,hardness and microstructure of the hole wall were characterized by scanning electron microscopy (SEM), roughmeter,X-ray diffraction (XRD), microhardness tester and optical microscopy. The mechanism of DCE on the fatigue life of the hole was also investigated. The results show that the mean value of the fatigue life of DCE specimen is much higher than that of the interference fit specimen. The surface integrity of the hole wall is improved after DCE. The roughness decreases remarkably. The deep surface-strengthen-layer with high hardness and deep residual compressive stress field are formed around the hole through severe plastic deformation of the microstructure of the hole wall. It is considered that the improvement of surface integrity plays an important role on the enhancement of fretting fatigue life. |
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来源
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航空材料学报
,2017,37(6):88-94 【核心库】
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DOI
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10.11868/j.issn.1005-5053.2017.000123
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关键词
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孔挤压
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钛合金
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疲劳寿命
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残余应力场
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硬度
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地址
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中国航发北京航空材料研究院, 航空材料先进腐蚀与防护航空科技重点实验室, 北京, 100095
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中国航发北京航空材料研究院, 北京, 100095
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1005-5053 |
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学科
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金属学与金属工艺 |
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基金
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国家973计划
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文献收藏号
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CSCD:6120751
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