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J Weld Join > Volume 31(3); 2013 > Article
Research Paper
Journal of KWJS 2013;31(3):31-38.
DOI: https://doi.org/10.5781/KWJS.2013.31.3.31    Published online June 30, 2013.
Effects of Serrated Grain Boundary Structures on Boron Enrichment and Liquation Cracking Behavior in the Simulated Weld Heat-Affected Zone of a Ni-Based Superalloy
Hyun-Uk Hong, June-Woo Choi, Sang-Hyun Bae, Joong-Geun Yoon, In-Soo Kim, Baig-Gyu Choi, Dong-Jin Kim, Chang-Yong Jo
Correspondence:  Hyun-Uk Hong,
Email: huhong@changwon.ac.kr
Abstract
The transition of serrated grain boundary and its effect on liquation behavior in the simulated weld heat-affected zone (HAZ) have been investigated in a wrought Ni-based superalloy Alloy 263. Recently, the present authors have found that grain boundary serration occurs in the absence of adjacent coarse γ´ particles or M23C6 carbides when a specimen is direct-aged with a combination of slow cooling from solution treatment temperature to aging temperature. The present study was initiated to determine the interdependence of the serration and HAZ property with a consideration of this serration as a potential for the use of a hot-cracking resistant microstructure. A crystallographic study indicated that the serration led to a change in grain boundary character as special boundary with a lower interfacial energy as those terminated by low-index {111} boundary planes. It was found that the serrated grain boundaries are highly resistant to boron enrichment, and suppress effectively grain coarsening in HAZ. Furthermore, the serrated grain boundaries showed a higher resistance to susceptibility of liquation cracking. These results was discussed in terms of a significant decrease in interfacial energy of grain boundary by the serration.
Key Words: Ni-based superalloy, Grain boundary serration, Special boundary, Interfacial energy, Segregation, Liquation, Simulated HAZ
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