The Evolution of Cast Microstructures on the HAZ Liquation Cracking of Mar-M004 Weld

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...

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Bibliographic Details
Published inMetals (Basel ) Vol. 8; no. 1; p. 35
Main Authors Cheng, Yi-Hsin, Chen, Jyun-Ting, Shiue, Ren-Kae, Tsay, Leu-Wen
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.01.2018
Subjects
Borides
Carbides
Chromium
Diffraction
Electron backscatter diffraction
Electrons
Fracture mechanics
Hafnium
Heat affected zone
Intermetallic compounds
liquation crack
Mar-M004 superalloy
Microstructure
Molybdenum
repair welding
Superalloys
X-ray diffraction
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Summary: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.
ISSN:2075-4701
2075-4701
DOI:10.3390/met8010035