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Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld

Institute of Materials Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan
Nuclear Fuels and Materials Division, Institute of Nuclear Energy Research, Taoyuan 32546, Taiwan
Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
Author to whom correspondence should be addressed.
Metals 2018, 8(6), 387;
Received: 7 May 2018 / Revised: 24 May 2018 / Accepted: 25 May 2018 / Published: 27 May 2018
(This article belongs to the Special Issue Science, Characterization and Technology of Joining and Welding)
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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. View Full-Text
Keywords: IN738 superalloy; welding; HAZ cracking; microconstituent IN738 superalloy; welding; HAZ cracking; microconstituent

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Chen, K.-C.; Chen, T.-C.; Shiue, R.-K.; Tsay, L.-W. Liquation Cracking in the Heat-Affected Zone of IN738 Superalloy Weld. Metals 2018, 8, 387.

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