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题名: Liquation Cracking in the Heat-affected Zone of IN 738 Superalloy Weld
作者: Kai-Cheng Chen
Tai-Cheng Chen
R. K. Shiue
Leu-Wen Tsay*
贡献者: 國立臺灣海洋大學:材料工程研究所
关键词: IN738 superalloy
welding
microconstituent
HAZ cracking
日期: 2018-05
上传时间: 2019-06-21T06:20:31Z
出版者: Metals
摘要: Abstract: The main scope of this study investigated the occurrence of liquation cracking in the heat-affected zone (HAZ) of IN738 superalloy weld, IN738 is widely used in gas turbine blades in land-based power plants. Microstructural examinations showed considerable amounts of γ’ uniformly precipitated in the γ matrix. Electron probe microanalysis (EPMA) maps showed the γ-γ’ colonies were rich in Al and Ti, but lean in other alloy elements. Moreover, the metal carbides (MC), fine borides (M3B2 and M5B3), η-Ni3Ti, σ (Cr-Co) and lamellar Ni7Zr2 intermetallic compounds could be found at the interdendritic boundaries. The fracture morphologies and the corresponding EPMA maps confirmed that the liquation cracking in the HAZ of the IN738 superalloy weld resulted from the presence of complex microconstituents at the interdendritic boundaries.
關聯: 8(6) pp.387
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/52286
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