Next Article in Journal
Impurity Effects in Electroplated-Copper Solder Joints
Next Article in Special Issue
Characteristics of Welding and Arc Pressure in the Plasma–TIG Coupled Arc Welding Process
Previous Article in Journal
Combined Galvanostatic and Potentiostatic Plasma Electrolytic Oxidation of Titanium in Different Concentrations of H2SO4
Previous Article in Special Issue
Characterizing the Soldering Alloy Type In–Ag–Ti and the Study of Direct Soldering of SiC Ceramics and Copper
Article Menu
Issue 6 (June) cover image

Export Article

Open AccessArticle

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

1
Institute of Materials Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan
2
Nuclear Fuels and Materials Division, Institute of Nuclear Energy Research, Taoyuan 32546, Taiwan
3
Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan
*
Author to whom correspondence should be addressed.
Metals 2018, 8(6), 387; https://doi.org/10.3390/met8060387
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)
  |  
PDF [3264 KB, uploaded 27 May 2018]
  |  

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. View Full-Text
Keywords: IN738 superalloy; welding; HAZ cracking; microconstituent IN738 superalloy; welding; HAZ cracking; microconstituent
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

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.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Metals EISSN 2075-4701 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top