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無保護層激光沖級強化提高K24鎳基合金疲勞強度試驗研究
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空軍工程大學航空航天工程學院等離子體重點實驗室,空軍工程大學航空航天工程學院等離子體重點實驗室,空軍工程大學航空航天工程學院等離子體重點實驗室,空軍工程大學航空航天工程學院等離子體重點實驗室,空軍工程大學航空航天工程學院等離子體重點實驗室,空軍工程大學航空航天工程學院等離子體重點實驗室

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國家自然科學基金項目（面上項目，重點項目，重大項目）;國家重點基礎(chǔ)研究發(fā)展計劃（973計劃）;


Experiment study on improving fatigue strength of K24 nickel based alloy by laser shock processing without coating
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Science and Technology on plasma dynamics laboratory,Air Force Engineering University,Xi’an,Science and Technology on plasma dynamics laboratory,Air Force Engineering University,Xi’an,Science and Technology on plasma dynamics laboratory,Air Force Engineering University,Xi’an,Science and Technology on plasma dynamics laboratory,Air Force Engineering University,Xi’an,Science and Technology on plasma dynamics laboratory,Air Force Engineering University,Xi’an,Science and Technology on plasma dynamics laboratory,Air Force Engineering University,Xi’an

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    摘要:

    無保護層激光沖擊強化是一種可以誘導高數(shù)值殘余壓應(yīng)力和微觀組織變化來達到提高金屬材料疲勞性能目的的先進表面強化技術(shù)。本文的研究目標是通過采用無保護層激光沖擊強化提高K24鎳基合金的抗疲勞特性。首先，采用高周振動疲勞試驗驗證了無保護層激光沖擊強化效果，疲勞試驗結(jié)果表明，強化后K24鎳基合金疲勞強度相比于未強化試件的282 MPa提高到328 MPa。其次，本文通過采用掃描電鏡（SEM）觀察、殘余應(yīng)力和顯微硬度測試研究了多次沖擊對K24鎳基合金機械性能以及斷口形貌的影響。殘余應(yīng)力測試結(jié)果表明，無保護層激光沖擊強化后表面形成了壓應(yīng)力，表面最大達到-595 MPa，且影響深度為150 μm。同樣3次沖擊后表面顯微硬度增加到526 HV0.5，深度約為100μm。斷口形貌特征表明強化后裂紋源區(qū)更加平坦，同時裂紋擴展速率降低。最后，基于疲勞試驗和力學性能測試結(jié)果進一步討論了激光沖擊強化提高疲勞強度的影響機制。

    Abstract:

    Laser shock processing without coating (LSPwC) is a novel surface treatment, which can effectively increase the fatigue strength of metal materials by introducing compressive residual stress and microstructural changes. The objective of this work is to improve the fatigue resistance of K24 nickel based alloy by LSPwC. Firstly, high cycle vibration fatigue experiment was adopted to verify the LSPwC strengthening effect. Compared to the untreated samples, the results of the vibration fatigue experiments showed that the fatigue strength of K24 alloy was enhanced and improved from 282MPa to 328MPa after LSPwC. Secondly, the effects of multiple impacts on mechanical properties and fatigue fracture morphologies were investigated, which were observed and measured by scan electron microscope (SEM), X-ray diffractometer and microhardness tester. The results indicated that residual stress presented compressive state on the superficial layer with about 150μm depth and the maximum value reaches -595MPa. The microhardness is about 526 HV0.5 with about 100 μm depth from the top surface after three impacts. The fracture observation indicated that the flatness area was larger in the FCI after LSPwC, meanwhile, the growth rate of fatigue crack was decreased. Lastly, the strengthening mechanism of LSPwC on the fatigue resistance was discussed based on the experimental results.

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羅思海,聶祥樊,王學德,王波,李靖,何衛(wèi)鋒.無保護層激光沖級強化提高K24鎳基合金疲勞強度試驗研究[J].稀有金屬材料與工程,2017,46(12):3682~3687.[Luo Sihai, Nie Xiangfan, Wang Xuede, Wang Bo, Li Jing, He Weifeng. Experiment study on improving fatigue strength of K24 nickel based alloy by laser shock processing without coating[J]. Rare Metal Materials and Engineering,2017,46(12):3682~3687.]
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  • 收稿日期:2015-12-26
  • 最后修改日期:2016-04-22
  • 錄用日期:2016-05-18
  • 在線發(fā)布日期: 2018-01-04
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