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噴丸對一種單晶合金表面完整性和高溫缺口疲勞性能的影響
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中國航發(fā)北京航空材料研究院,,中國航發(fā)北京航空材料研究院,中國航發(fā)北京航空材料研究院,中國航發(fā)北京航空材料研究院

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航空科學(xué)基金（2015Z02117）


Effect of shot peening on the surface integrity and notched fatigue properties of a single-crystal superalloy at elevated temperature
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Beijing institute of aeronautical material,Wenquan Town,Haidian Distinct,Shenyang institute of aero-engine design,Jiangdong Road,Shenhe Distinct,Beijing institute of aeronautical material,Wenquan Town,Haidian Distinct,Beijing institute of aeronautical material,Wenquan Town,Haidian Distinct,Beijing institute of aeronautical material,Wenquan Town,Haidian Distinct

Fund Project:

Aeronautical Science Foundation of China (2015Z02117)

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    摘要:

    研究了噴丸后單晶合金的表面完整性和高溫缺口疲勞性能。噴丸后表面形貌采用白光干涉儀表征，掃描電鏡，兩個方向觀察（平行于受噴表面和截面方向）高分辨透射電鏡和電子背散射衍射分析，疲勞性能采用旋轉(zhuǎn)彎曲疲勞模式表征。采用旋轉(zhuǎn)彎曲疲勞極限表征了強化增益作用，并與噴丸顯微組織建立聯(lián)系。結(jié)果表明，在760℃到850℃區(qū)間，噴丸強化較原始加工狀態(tài)的疲勞極限增益達到14.8%，主要原因是高密度的纏結(jié)位錯、加工硬化和晶粒錯配。此外，通過表面應(yīng)力集中系數(shù)計算表明，即使在平均粗糙度Ra升高的基礎(chǔ)上，噴丸強化后表面應(yīng)力集中系數(shù)降低。

    Abstract:

    The surface integrity and notched fatigue property of a shot-peened single crystal superalloy were investigated. The surface texture of the peened material was determined using a white light interferometer, while the microstructural characterization was performed using a scan electron microscopy, high resolution transmission electron microscopy from the plane and cross-section view directions, micro-hardness tester and electron backscatter diffraction. The gains, expressed in term of high temperature fatigue limit, were established by rotating-bending fatigue tests and discussed in relation to the microstructure evolution in the shot peening states. This revealed that the beneficial effect provided by shot peening is more than 14.8% against as-machined in a temperature ranging from 760℃ to 850℃ because of the high-density tangled dislocation, cold work and disorientation. Furthermore, the stress concentration coefficient is reduced by the shot peening procedure while the average profile height Ra increases according to the calculation of the surface stress concentration.

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王欣,張濤,黃朝暉,湯智慧,趙振業(yè).噴丸對一種單晶合金表面完整性和高溫缺口疲勞性能的影響[J].稀有金屬材料與工程,2018,47(6):1668~1676.[Wang Xin, Zhang Tao, Huang Zhaohui, Tang Zhihui, Zhao Zhenye. Effect of shot peening on the surface integrity and notched fatigue properties of a single-crystal superalloy at elevated temperature[J]. Rare Metal Materials and Engineering,2018,47(6):1668~1676.]
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  • 收稿日期:2016-09-10
  • 最后修改日期:2017-06-17
  • 錄用日期:2017-06-23
  • 在線發(fā)布日期: 2018-09-06
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