National Taiwan Ocean University Institutional Repository:Item 987654321/50739
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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50739

Title: The Evolution of Cast Microstructures on the HAZ Liquation Cracking of Mar-M004 Weld
Authors: Yi-Hsin Cheng
Jyun-Ting Chen
Ren-Kae Shiue
Leu-Wen Tsay
Contributors: 國立臺灣海洋大學:材料工程研究所
Keywords: liquation crack
heat-affected zone
Mar-M004 superalloy
repair welding
Date: 2018-04
Issue Date: 2018-10-22T07:57:32Z
Publisher: Metals
Abstract: Abstract: The causes of liquation cracking in the heat-affected zone (HAZ) of a cast Mar-M004 superalloy weld were investigated. X-ray diffraction (XRD), electron probe microanalyzer (EPMA), and electron backscatter diffraction (EBSD) were applied to identify the final microconstituents at the solidification boundaries of the cast alloy. Fine borides and lamellar eutectics were present in front of some γ-γ′ colonies, which were expected to be liquefied prematurely during welding. The metal carbide (MC) enriched in Nb, Hf; M3B2 and M5B3 borides enriched in Cr and Mo; and lamellar Ni-Hf intermetallics were mainly responsible for the induced liquation cracking of the Mar-M004 weld, especially the MC carbides. Scanning electron microscope (SEM) fractographs showed that the fracture features of those liquation cracks were associated with the interdendritic constituents in the cast superalloy.
Relation: 8(1)
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50739
Appears in Collections:[Institute of Materials Engineering] Periodical Articles

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