발간논문

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Vol.40, No.9, 1016 ~ 1022, 2002
Title
Welding & Joining : Cracking Observed in the Socket Weld HAZ of Hastelloy C-276 Alloy
김진우Jin Woo Kim,최승학Byung Hak Choe,홍전선Jin Sun Hong,김우식Woo Sik Kim,고영태Young Tai Kho,조종춘Chong Chun Cho
Abstract
This paper presents the main finding of cracking in a Ni-base alloy tube of Hastelloy C-276. It was developed as inter-granular cracking in the heat affected zone(HAZ) or weld metal that occurs during the exposure of welded assemblies to the elevated temperatures. Crack propagation along grain boundaries caused leak failure in the HAZ of socket welding tube. In the HAZ of socket welding, the cracking was not accompanied by coarse carbide precipitation such as Cr23C6 and Cr depleted zone in grain boundary. The intra-grain, however, was inflicted by highly dense dislocations and severe elastic strain fields by thermal stress or strain caused in welding as cooling. These may be caused by carbon diffusion during heating service, and result in construction of high-strengthened matrix in HAZ. The cracking may occur in relatively weak grain boundaries due to grain boundary sliding of the creep condition.
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