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GH4133鎳基高溫合金激光沖擊強(qiáng)化研究
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國家自然科學(xué)基金 (51305456)


Laser Shock Peening of GH4133 Nickel-based Superalloy
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    摘要:

    為了研究激光沖擊強(qiáng)化技術(shù)在高溫部件上應(yīng)用的可行性，研究了GH4133鎳基高溫合金激光沖擊后強(qiáng)化效果的熱穩(wěn)定性。分別采用激光沖擊強(qiáng)化、激光沖擊強(qiáng)化加保溫的方法進(jìn)行處理，并利用SEM、顯微硬度和殘余應(yīng)力的測試方法分析了溫度對激光沖擊處理后GH4133材料微觀組織和力學(xué)性能的影響。通過沖擊強(qiáng)化后渦輪葉片的高溫疲勞試驗(yàn)驗(yàn)證強(qiáng)化效果的熱穩(wěn)定性，并分析其高溫下的強(qiáng)化機(jī)制。結(jié)果表明，激光沖擊強(qiáng)化可以在GH4133鎳基高溫合金表層產(chǎn)生較大殘余壓應(yīng)力，細(xì)化晶粒；并且在溫度作用下，激光沖擊GH4133合金形成的細(xì)化晶粒在析出相的釘扎作用下具有較好的熱穩(wěn)定性。另一方面殘余壓應(yīng)力的應(yīng)力集中減小，分布均勻。兩者的共同作用提高了強(qiáng)化效果的熱穩(wěn)定性，有利于疲勞性能的提高

    Abstract:

    In order to investigate the feasibility of laser shock peening (LSP) on the components suffering high temperature in work, the thermal stability of LSP effects on GH4133 nickel-based superalloy were studied. GH4133 nickel-based superalloy samples were treated by laser shock peening and laser shock peening+annealing separately. The thermal stability was examined by scanning electron microscopy (SEM), microhardness and residual stress tests. High-temperature fatigue of turbine blades was tested and the mechanism of fatigue life improvement was also discussed. Results show that high-amplitude residual compressive stress and grain refinement are generated, and precipitated phase of GH4133 alloy treated by LSP has a great impact on thermal stability for the refined grains. On the other hand, stress concentration slows up and distributes uniformly. Both of microstructure and residual compressive stress are propitious to fatigue life

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李玉琴,何衛(wèi)鋒,聶祥樊,李 靖,柴 艷. GH4133鎳基高溫合金激光沖擊強(qiáng)化研究[J].稀有金屬材料與工程,2015,44(6):1517~1521.[Li Yuqin, He Weifeng, Nie Xiangfan, Li jing, Chai Yan. Laser Shock Peening of GH4133 Nickel-based Superalloy[J]. Rare Metal Materials and Engineering,2015,44(6):1517~1521.]
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  • 收稿日期:2014-06-01
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  • 在線發(fā)布日期: 2016-01-04
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