DD6合金1100℃低周疲勞行為

DD6合金1100℃低周疲勞行為Low Cycle Fatigue of Single Crystal Nickel-based Superalloy DD6 at 1100℃

研究了1100℃下鎳基單晶高溫合金DD6不同應(yīng)變比（R=-1，0.05）下的低周疲勞行為。結(jié)果表明：材料的循環(huán)軟化／硬化行為不僅與材料本身的微觀結(jié)構(gòu)有關(guān)，還與加載狀態(tài)有關(guān)；平均應(yīng)變?yōu)檎龝r(shí)，非對(duì)稱循環(huán)應(yīng)變控制會(huì)產(chǎn)生平均應(yīng)力松弛現(xiàn)象，且隨著應(yīng)變幅的增大，平均應(yīng)力松弛速率增大；R=-1時(shí)，材料表現(xiàn)出拉壓不對(duì)稱性；采用三種不同的模型對(duì)不同應(yīng)變比下的壽命進(jìn)行表征，預(yù)測(cè)精度基本落在±2倍的分散帶內(nèi)。

The total strain-controlled low cycle fatigue(LCF) behaviors of a single crystal superalloy DD6 at 1100℃ for R=-1 and 0.05 were investigated. The results of LCF tests indicated that the cyclic hardening/softening behavior of the alloy not only has the relationship with the microstructure of the material, but also the loading status. The mean stress relaxation occurred under asymmetric straining. The rate of mean stress relaxation increased with the increasing of strain amplitude; when R=-1, the alloy shows tension-compression asymmetry behavior. All the LCF data obtain under various ratios were well correlated by three models for lifetime prediction, the precision rates predicted are fallen into the factor of±2 times scatter band.

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