the evolution of cast microstructures on the haz liquation cracking of mar-m004 weld

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ID: 257755
2018
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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.
Reference Key
cheng2018metalsthe Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Yi-Hsin Cheng;Jyun-Ting Chen;Ren-Kae Shiue;Leu-Wen Tsay
Journal seminars in cancer biology
Year 2018
DOI
10.3390/met8010035
URL
http://www.mdpi.com/2075-4701/8/1/35
Keywords
heat-affected zone metallurgy repair weldingmining engineering

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