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GH864合金蠕變/疲勞裂紋擴展速率及a-N曲線分析
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國家自然科學基金（50771011）


Analysis of Fatigue/Creep Crack Propagations Rates and a-N Curves of GH864 Alloy
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    摘要:

    研究了GH864合金不同保載時間下650 ℃蠕變/疲勞裂紋擴展行為，分析了裂紋擴展過程中蠕變和氧化的作用，以及a-N曲線的轉折點含義。結果表明：保載5 s時GH864合金以穿晶斷裂為主，疲勞作用占主導；保載90 s時GH864合金以沿晶斷裂為主，蠕變作用占主導。利用Saxena模型可較好地表征本實驗條件下650 ℃蠕變/疲勞交互作用的裂紋擴展速率曲線，可估算較高應力強度因子和較低應力強度因子的裂紋擴展速率。另外，用Saxena模型可求出蠕變和疲勞的表達式，對比分析高溫蠕變/疲勞交互作用的裂紋擴展過程中蠕變和疲勞的作用及所占的比例。最后針對a-Ni/Nf、da/dN-a曲線及da/dN-N曲線變換中出現(xiàn)的拐點，結合斷口形貌分析了轉折點對應的含義。高溫合金及其它材料的裂紋擴展速率曲線也適用于以上曲線分析方法。

    Abstract:

    The crack propagation behavior of GH864 alloy was studied at 650 oC under fatigue/creep interaction with different dwell time; the effects of creep and oxidation and the meaning of transition point were analyzed in da-dN and a-N curves. The results indicate that the crack growth rate under dwell 90 s is higher than that under dwell 5 s. The alloy is mainly trans-granular fracture under dwell 5 s and the fatigue effect is principle. The alloy is mainly inter-granular fracture under dwell 90 s and the creep effect is dominant. The crack propagation rate curves of fatigue/creep interaction at 650 oC could well be described by Saxena model under the condition of this test. The descriptions could estimate the crack growth rates at lower and higher stress intensity factors. In addition, the expressions of different alloys from Saxena could contrast the effects of fatigue and creep as well as their proportion. At last, the transition points of a-Ni/Nf, da/dN-a and da/dN-N curves were obtained and the meaning of these points was analyzed with fracture analysis. The curve analysis method can also be used for the crack propagation rate curves of superalloys and other materials.

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王 璞,董建新,張麥倉,鄭 磊,謝錫善. GH864合金蠕變/疲勞裂紋擴展速率及a-N曲線分析[J].稀有金屬材料與工程,2011,40(4):630~634.[Wang Pu, Dong Jianxin, Zhang Maicang, Zheng Lei, Xie Xishan. Analysis of Fatigue/Creep Crack Propagations Rates and a-N Curves of GH864 Alloy[J]. Rare Metal Materials and Engineering,2011,40(4):630~634.]
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  • 收稿日期:2010-04-26
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