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李康,付雪松,李志强,周文龙.湿喷丸强化对TC4疲劳性能的影响机制[J].稀有金属材料与工程(英文),2017,46(10):3068~3072.[LI Kang,FU Xue-song,LI Zhi-qiang and 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.]
Fatigue fracture mechanism of Ti-6Al-4V strengthened by wet peening treatment
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Received:July 17, 2015  Revised:November 17, 2015
Key words: Ti-6Al-4V alloy  wet peening  strengthening mechanism  fatigue
Foundation item:中国博士后科学基金(2014M551074);青年科学基金(51405059);国家自然科学基金(51175059);中央高校基本科研业务费专项资金(DUT14YQ105)
Author NameAffiliation
LI Kang,FU Xue-song,LI Zhi-qiang and ZHOU Wen-long  
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      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.