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GH2036高溫合金平板裂紋閉合效應(yīng)及裂紋擴(kuò)展模型
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北京航空航天大學(xué)能源與動(dòng)力工程學(xué)院,北京航空航天大學(xué)能源與動(dòng)力工程學(xué)院,中國(guó)空間技術(shù)研究院總體部,北京航空航天大學(xué)實(shí)驗(yàn)學(xué)校中學(xué)部,北京航空航天大學(xué)電氣工程及其自動(dòng)化學(xué)院,北京航空航天大學(xué)能源與動(dòng)力工程學(xué)院

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國(guó)家自然科學(xué)基金(51675024, 51305012, 51375031),航空科學(xué)基金(2014ZB51)


Crack closure effect and crack growth life prediction for GH2036 superalloy plate
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School of Energy and Power Engineering,Beihang University,School of Energy and Power Engineering,Beihang University,,,,School of Energy and Power Engineering,Beihang University

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    摘要:

    為探明GH2036高溫合金的低循環(huán)疲勞裂紋擴(kuò)展機(jī)理，本文對(duì)GH2036高溫合金平板在550°C、不同應(yīng)力比下的低循環(huán)疲勞裂紋擴(kuò)展特性進(jìn)行了試驗(yàn)研究，采用數(shù)字圖像相關(guān)（DIC）方法確定了GH2036高溫合金的張開(kāi)應(yīng)力強(qiáng)度因子。結(jié)果表明，550°C溫度、應(yīng)力比大于0.7時(shí)GH2036高溫合金無(wú)裂紋閉合現(xiàn)象，在此基礎(chǔ)上建立了以殘余裂尖張開(kāi)位移、應(yīng)力比為參量的GH2036高溫合金裂紋閉合模型。而后，斷口的SEM分析表明：隨著應(yīng)力比的增加，裂紋擴(kuò)展區(qū)由穿晶斷裂向沿晶斷裂轉(zhuǎn)化。最后，基于GH2036高溫合金的裂紋閉合模型，建立了GH2036高溫合金平板的低循環(huán)疲勞裂紋擴(kuò)展壽命預(yù)測(cè)方法，與試驗(yàn)數(shù)據(jù)吻合良好，驗(yàn)證了方法的準(zhǔn)確性。

    Abstract:

    In order to examine the crack growth behavior of GH2036 supealloy subjected to low cycle fatigue (LCF) loading, crack growth experiments on GH2036 superalloy plates under different ratios at 550 °C were performed and the crack opening stress intensity factor of GH2036 superalloy were measured using Digital Image Correlation (DIC) technique. It was shown that no crack closure is observed at 550 °C when the stress ratio is greater than 0.7. Meanshile, crack closure model in GH2036 superalloy was established in terms of the residual crack tip opening displacement and stress ratio. In addition, SEM analysis of fracture analysis showed that with the increase of stress raio, the fracture mode at the crack growth region changes from transgranular to intergranular. Finally, crack growth life of GH2036 superalloy under LCF loading was predicted using the established crack closure model in GH2036 superalloy plates. Low life scatter factor through model validation indicated satisfactory results of the predicted crack growth life model.

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胡殿印,楊乾,劉華偉,王炎飛,任夢(mèng)溪,王榮橋. GH2036高溫合金平板裂紋閉合效應(yīng)及裂紋擴(kuò)展模型[J].稀有金屬材料與工程,2017,46(11):3405~3409.[Hu Dianyin, Yang Qian, Liu Huawei, Wang Yanfei, Ren Mengxi, Wang Rongqiao. Crack closure effect and crack growth life prediction for GH2036 superalloy plate[J]. Rare Metal Materials and Engineering,2017,46(11):3405~3409.]
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  • 收稿日期:2016-09-12
  • 最后修改日期:2017-01-05
  • 錄用日期:2017-01-06
  • 在線發(fā)布日期: 2017-12-13
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