t=1.2%的試驗(yàn)條件下,相比于車削狀態(tài),二次噴丸后疲勞壽命提高108%；相比之下,一次噴丸提高21%；噴丸后疲勞壽命分散度減小。經(jīng)過(guò)斷口宏微觀觀察和反推分析說(shuō)明,三種表面完整性狀態(tài)的疲勞擴(kuò)展壽命很接近,造成疲勞壽命差別的主要原因是裂紋萌生差別,二次噴丸的裂紋萌生壽命分別是一次噴丸的221%,以及車削狀態(tài)的216%。利用工藝手段優(yōu)化表面完整性是提高FGH96合金表面完整性和低循環(huán)疲勞壽命的關(guān)鍵。"/>

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表面完整性對(duì)FGH96粉末合金高溫低循環(huán)疲勞性能的影響研究
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中國(guó)航發(fā)北京航空材料研究院

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航空基金(2015ZF21017)和中航工業(yè)技術(shù)創(chuàng)新基金(2013E62137R)


Effect of Surface Integrity on Low-cycle Fatigue of FGH96 Powder Metallurgy Superalloy
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AECC Beijing Institute of Aeronautical Materials

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    摘要:

    采用陶瓷彈丸和鑄鋼丸+陶瓷丸為介質(zhì)對(duì)FGH96合金車削表面進(jìn)行噴丸強(qiáng)化,引入3種表面完整性狀態(tài)。研究了一次噴丸、二次噴丸和車削狀態(tài)下表面形貌、殘余應(yīng)力場(chǎng)和高溫低循環(huán)疲勞壽命。結(jié)果表明：二次噴丸強(qiáng)化在消除車削刀痕和表面平均粗糙度增大的同時(shí),引入了底部圓滑的彈坑,二次噴丸后Kurtosis值趨向3,但強(qiáng)度較小的一次噴丸僅能夠部分消除刀痕；同時(shí),一次噴丸和二次噴丸后,表面殘余壓應(yīng)力由車削的-446MPa,提高到-1000MPa～-1100MPa,二次噴丸后殘余壓應(yīng)力場(chǎng)深度由車削的100μm提高到250μm,一次噴丸殘余壓應(yīng)力場(chǎng)深度與車削狀態(tài)相當(dāng)。在二次噴丸良好的表面完整性作用下,在650℃/εt=1.2%的試驗(yàn)條件下,相比于車削狀態(tài),二次噴丸后疲勞壽命提高108%；相比之下,一次噴丸提高21%；噴丸后疲勞壽命分散度減小。經(jīng)過(guò)斷口宏微觀觀察和反推分析說(shuō)明,三種表面完整性狀態(tài)的疲勞擴(kuò)展壽命很接近,造成疲勞壽命差別的主要原因是裂紋萌生差別,二次噴丸的裂紋萌生壽命分別是一次噴丸的221%,以及車削狀態(tài)的216%。利用工藝手段優(yōu)化表面完整性是提高FGH96合金表面完整性和低循環(huán)疲勞壽命的關(guān)鍵。

    Abstract:

    Ceramic shot and ceramic shot+cast-iron shot were employed to peen the turning surface of FGH96 powder metallurgy superalloy to induce 3 surface integrity statues. Surface topography, residual stress profile and high-temperature low-cycle fatigue performance were investigated of single shot peening (SSP), double shot peening (DSP) and turning statues. The results show that DSP removes turning masks, increases the average roughness Ra, and induce the crater with smooth bottom, which makes the Kurtosis parameter approach 3. Moreover as contrast, SSP with low intensity could only partially eliminate marks. Meanwhile, surface compressive residual stress values are -1000MPa to -1100MPa by SSP and DSP compared with -446MPa by turning, furthermore, the depth of DSP residual stress profile is 250μm, SSP and turning are 100μm. By the effect of perfect DSP surface integrity statue, fatigue cycles increase to 108% compared with turning, and the SSP edges up only 21% in the fatigue condition of 650℃/εt=1.2%. The fatigue life dispersion decreases after peening. The results of macro/microscopic observation and analysis show the fatigue propagation lifes are close of three surface integrity statues while the fatigue initiation lifes vary greatly. The initiation life of DSP is 221% of SSP and 216% of turning. It is important and necessary to optimize the shot peening method for surface integrity promotion and high temperature low-cycle fatigue performance improvement.

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王欣,陳星,王曉峰,宋穎剛,湯智慧,鄒金文.表面完整性對(duì)FGH96粉末合金高溫低循環(huán)疲勞性能的影響研究[J].稀有金屬材料與工程,2019,48(1):269~278.[Wang Xin, Chen Xing, Wang Xiaofeng, Song Yinggang, Tang Zhihui, Zou Jinwen. Effect of Surface Integrity on Low-cycle Fatigue of FGH96 Powder Metallurgy Superalloy[J]. Rare Metal Materials and Engineering,2019,48(1):269~278.]
DOI：10.12442/j. issn.1002-185X.20170378

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  • 收稿日期:2017-05-09
  • 最后修改日期:2017-09-10
  • 錄用日期:2017-09-12
  • 在線發(fā)布日期: 2019-02-18
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