The effects of cycle temperatures on the thermal fatigue crack growth of three kinds of superalloys were investigated. The experimental results show that the crack growth rate increases with the rise of cycle temperature. Optical Microscopy (OM) and Scanning electron microscopy (SEM) observations reveal that multiple small cracks primarily initiated at the notch tip in any temperature range. Subsequently, only one or two small cracks can continue to grow, and finally form the main cracks. The crack growth behavior varies distinctly for different alloys. In general, thermal fatigue cracks propagate along a preferential direction with the dendrite growth direction in single crystal superalloy, but along the interdendritic region for the Mar-M002 alloy.
參考文獻(xiàn)
相似文獻(xiàn)
引證文獻(xiàn)
引用本文
劉 源,于金江,徐 巖,孫曉峰.單晶高溫合金的冷熱疲裂紋生長行為研究[J].稀有金屬材料與工程,2009,38(1):59~63.[Liu Yuan, Yu Jinjiang, Xu Yan, Sun Xiaofeng. Thermal Fatigue Behavior of Single-Crystal Superalloy[J]. Rare Metal Materials and Engineering,2009,38(1):59~63.] DOI：[doi]