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濕噴丸強化對TC4疲勞性能的影響機制
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大連理工大學材料科學與工程學院,大連理工大學材料科學與工程學院,北京航空制造工程研究所,大連理工大學材料科學與工程學院

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中國博士后科學基金(2014M551074)；青年科學基金(51405059)；國家自然科學基金(51175059)；中央高?；究蒲袠I(yè)務費專項資金(DUT14YQ105)


Fatigue fracture mechanism of Ti-6Al-4V strengthened by wet peening treatment
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School of Materials and Science Engineering,Dalian University of Technology,School of Materials and Science Engineering,Dalian University of Technology,Beijing Aeronautical Manufacturing Technology Research Institute,School of Materials and Science Engineering,Dalian University of Technology

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    摘要:

    利用濕噴丸技術(shù)對TC4鈦合金進行表面改性處理,顯著提高了材料疲勞壽命。對疲勞斷口微觀組織觀察發(fā)現(xiàn),濕噴丸強化處理使試樣疲勞裂紋萌生位置由表面轉(zhuǎn)移至試樣內(nèi)部約1 mm深度區(qū)域。通過對濕噴丸改性層微觀組織分析可知,改性層內(nèi)的細晶強化和位錯強化是導致裂紋萌生位置發(fā)生改變的主要因素。濕噴丸引入的殘余壓應力對裂紋擴展起到有效的阻礙作用。細晶強化、位錯強化和殘余壓應力共同作用提高TC4鈦合金的抗疲勞性能。

    Abstract:

    A modified surface layer was fabricated on Ti-6Al-4V alloy by means of wet peening treatment. The fatigue life of specimen which suffered wet peening treatment was obviously increased. Compared with the fracture of un-peened sample, the fatigue crack initial site was transferred from surface to the interior region beneath the surface (about 1 mm depth). The co-action of grain refinement strengthening and dislocation strengthening dominated the transferred fatigue crack initial site. The compressive residual stress effectively delayed the crack propagation. The grain refinement strengthening, the dislocation strengthening as well as the compressive residual stress were the main factors of increased fatigue life.

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李康,付雪松,李志強,周文龍.濕噴丸強化對TC4疲勞性能的影響機制[J].稀有金屬材料與工程,2017,46(10):3068~3072.[LI Kang, FU Xue-song, LI Zhi-qiang, ZHOU Wen-long. Fatigue fracture mechanism of Ti-6Al-4V strengthened by wet peening treatment[J]. Rare Metal Materials and Engineering,2017,46(10):3068~3072.]
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  • 收稿日期:2015-07-17
  • 最后修改日期:2015-11-17
  • 錄用日期:2015-12-08
  • 在線發(fā)布日期: 2017-12-01
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