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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/48163

Title: The effect of Nb and S segregation on the solidification cracking of alloy 52M weld overlay on CF8 stainless steel
Authors: H. A. Chu
M. C. Young
H. C. Chu
L.W. Tsay
C. Chen
Contributors: 國立臺灣海洋大學:光電與材料科技學系
Date: 2014-03
Issue Date: 2018-08-15T01:12:37Z
Publisher: Journal of Materials Engineering and Performance
Abstract: Abstract: The weld overlay of Alloy 52M (a nickel-based filler metal) on a cast 304 (CF8) stainless steel (SS) was made to simulate overlay welding of the safe end of reactor pressure vessels in nuclear power plants. The deteriorated effect of sulfur on solidification cracking of the Alloy 52M overlay was highlighted by using a CF8 substrate with 0.14 wt.% S. Severe solidification cracking was observed when Alloy 52M was directly overlaid on the CF8 substrate. To lower the cracking susceptibility, ER 308L was deposited on the CF8 SS as a buffer layer before the subsequent deposition of Alloy 52M. Under such circumstances, the region near the weld interface between the SS buffer layer and Alloy 52M overlay was susceptible to solidification cracking. The formation of γ-NbC(N), γ-Laves, and γ-(Fe-Ni-S) eutectic-type constituents at the solidification boundaries was responsible for cracking near the weld interface. Nevertheless, depositing two layers of 308L prior to applying Alloy 52M could effectively reduce the cracking susceptibility of the overlay.
Relation: 23(3) pp.967-974
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/48163
Appears in Collections:[光電科學研究所] 期刊論文

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