1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; 2. Air China Development Aviation Technology Co., Ltd., Chengdu 610503, China
Abstract：It is of great significance to discuss the distribution of impurity elements to avoid defect generation and expansion. The distribution of oxygen, nitrogen, hydrogen, carbon and sulfur in nickel-based alloy ingot was explored by dissecting the entire nickel-based high temperature alloy ingot. The anatomical method was mainly transverse section sampling, with longitudinal sampling of 4mm×4mm thin strips along the ingot side as a supplement. Five pieces of round cakes were cut transversely, and about total 56 single samples were prepared for each piece. Two rods were cut longitudinally, and 80 single samples were prepared for each rod. The oxygen, nitrogen, hydrogen, carbon and sulfur analyzers based on infrared and thermal conductivity detection principle were adopted for data acquisition to guarantee the measurement accuracy. The experimental results showed that oxygen, nitrogen, hydrogen and carbon were evenly distributed in longitudinal direction along the ingot with the exception of the ingot core. The segregation of transverse distribution was serious. The closer to the core was, the more serious the segregation of oxygen, nitrogen, hydrogen and carbon. For oxygen and hydrogen, the segregation range even exceed an order of magnitude. Carbon was no exception, and the aggregation and precipitation of tiny carbide particles along the edge of shrinkage cavity could be observed by metallographic microscope in the central pore area of the alloy ingot. The segregation of nitrogen was not serious. The transverse and longitudinal distribution of sulfur was uniform without segregation.
谢君, 严志, 侯桂臣, 朱瑛才, 周亦胄, 朱跃进. 氧氮氢碳硫在镍基高温合金锭中分布的研究[J]. 冶金分析, 2020, 40(11): 17-25.
XIE Jun, YAN Zhi, HOU Gui-chen, ZHU Ying-cai ZHOU Yi-zhou, ZHU Yue-jin. Study on distribution of oxygen, nitrogen, hydrogen, carbon and sulfur in nickel-based high temperature alloy ingot. , 2020, 40(11): 17-25.
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