Thermal fatigue behavior of K125L superalloy
来源期刊：Rare Metals2016年第2期
论文作者：Li-Kui Ning Zhi Zheng Song Tang Jian Tong Hui-Si Ji
文章页码：172 - 176
摘 要：The thermal fatigue behavior of K125 L superalloy at the peak temperature of 1,050 °C was investigated by optical microscope（OM）, X-ray diffraction（XRD）, and scanning electron microscope（SEM）. The experimental results show that the crack initiation sites of tested alloys are at the V-notch tip and the V-notch tip propagates by way of continuous cracking along grain boundaries. The formation of high-temperature oxides and MC carbides accelerates the crack propagation, and no secondary carbides precipitate out. Oxides between cracks are mainly the Al2O3 as well as Cr2O3, and carbides are Ta-rich and Tirich MC carbides.
Li-Kui Ning1，Zhi Zheng1，Song Tang1，Jian Tong1，Hui-Si Ji1
1. Institute of Metal Research, Chinese Academy of Sciences
摘 要：The thermal fatigue behavior of K125 L superalloy at the peak temperature of 1,050 °C was investigated by optical microscope（OM）, X-ray diffraction（XRD）, and scanning electron microscope（SEM）. The experimental results show that the crack initiation sites of tested alloys are at the V-notch tip and the V-notch tip propagates by way of continuous cracking along grain boundaries. The formation of high-temperature oxides and MC carbides accelerates the crack propagation, and no secondary carbides precipitate out. Oxides between cracks are mainly the Al2O3 as well as Cr2O3, and carbides are Ta-rich and Tirich MC carbides.
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