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GH742高溫合金激光沖擊強(qiáng)化和噴丸強(qiáng)化殘余應(yīng)力
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同濟(jì)大學(xué)航空航天與力學(xué)學(xué)院

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建筑及新能源材料的制備技術(shù)與應(yīng)用基礎(chǔ)研究（桂科能110310802）；廣西高?？蒲许?xiàng)目（2013YB117）


Residual stresses of GH742 Superalloy induced by laser peening and shot peening
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School of Aerospace Engineering and Applied Mechanics, Tongji University

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    摘要:

    對GH742高溫合金進(jìn)行激光沖擊強(qiáng)化和噴丸強(qiáng)化，利用X射線應(yīng)力分析儀測定強(qiáng)化層的殘余應(yīng)力，對比分析2種殘余應(yīng)力的差異和特征，并采用不同的退化溫度進(jìn)行退火，研究表面殘余應(yīng)力在高溫下的穩(wěn)定性。 結(jié)果表明，2種表面強(qiáng)化方法都可以在GH742高溫合金表層引入殘余壓應(yīng)力，但激光沖擊強(qiáng)化試樣比噴丸強(qiáng)化試樣具有更深的殘余壓應(yīng)力層和較好的穩(wěn)定性，且殘余壓應(yīng)力最大值在表面；與激光沖擊強(qiáng)化的試樣相比，噴丸強(qiáng)化試樣的殘余壓應(yīng)力較淺，而且隨著噴丸強(qiáng)度的增加，最大殘余壓應(yīng)力也由表面移向了次表面。

    Abstract:

    Effects of laser peening and shot peening on residual stress fields performance of a GH742 superalloy were investigated. Compressive residual stresses in the surface layer were analyzed by the X-ray diffraction stress analyse tester. The characteristics of compressive residual stresses induce by these two kinds of surface enhancement processes were compared and the surface residual stress evlution was investigated under different high temperatures. The results show that both laser peening and shot peening can induce compressive residual stresses in surface layer, while the compressive residual stress layer is deeper for laser-peened specimens and the maximum residual compressive locate at surface; while for shot-peened specimens, the depth of compressive residual stress layer in thinner. Moreover, the maximum compressive residual stress moves from surface to subsurface with the increase of shot peening intensity.

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高玉魁. GH742高溫合金激光沖擊強(qiáng)化和噴丸強(qiáng)化殘余應(yīng)力[J].稀有金屬材料與工程,2016,45(9):2347~2351.[Gao Yukui. Residual stresses of GH742 Superalloy induced by laser peening and shot peening[J]. Rare Metal Materials and Engineering,2016,45(9):2347~2351.]
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  • 收稿日期:2014-07-10
  • 最后修改日期:2015-06-04
  • 錄用日期:2015-08-11
  • 在線發(fā)布日期: 2016-10-09
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