TY - JOUR
T1 - Microstructures and microhardness at fusion boundary of 316 stainless steel/Inconel 182 dissimilar welding
AU - Wang, Wei
AU - Lu, Yonghao
AU - Ding, Xianfei
AU - Shoji, Tetsuo
N1 - Funding Information:
The work described in this paper was supported by the Important National Science & Technology Specific Projects of China , 2011ZX06004-009 ; National Energy Application Technology Research and Engineering Demonstration Project , NY20111201-1 , and the 111 Project (Grant No. B12012 ).
Publisher Copyright:
© 2015 Elsevier Inc.
PY - 2015/8/3
Y1 - 2015/8/3
N2 - Microstructures and microhardness at fusion boundary of a weld joint were investigated in a 316 stainless steel/Inconel 182 dissimilar weldment. The results showed that there were two alternately distributed typical fusion boundaries, a narrow random boundary (possessed 15% in length) with a clear sharp interface and an epitaxial fusion one with (100)BM//(100)WM at the joint interface. The composition transition, microstructure and hardness across the fusion boundary strongly depended on the type of the fusion boundary. For the random boundary, there was a clear sharp interface and the composition transition with a width of 100 μm took place symmetrically across the grain boundary. For the epitaxial fusion one, however, there were Type-I and Type-II grain boundaries perpendicular and parallel to the epitaxial fusion boundary, respectively. The composition transition took place in the Inconel 182 weld side. Σ3 boundaries in the HAZ of 316SS side and Σ5 grain boundaries in weld metal were usually observed, despite the type of fusion boundary, however the former was much more in epitaxial fusion boundary. Microhardness was continuously decreased across the random fusion boundary from the side of Inconel 182 to 316SS, but a hardening phenomenon appeared in the epitaxial fusion boundary zone because of its fine cellular microstructure.
AB - Microstructures and microhardness at fusion boundary of a weld joint were investigated in a 316 stainless steel/Inconel 182 dissimilar weldment. The results showed that there were two alternately distributed typical fusion boundaries, a narrow random boundary (possessed 15% in length) with a clear sharp interface and an epitaxial fusion one with (100)BM//(100)WM at the joint interface. The composition transition, microstructure and hardness across the fusion boundary strongly depended on the type of the fusion boundary. For the random boundary, there was a clear sharp interface and the composition transition with a width of 100 μm took place symmetrically across the grain boundary. For the epitaxial fusion one, however, there were Type-I and Type-II grain boundaries perpendicular and parallel to the epitaxial fusion boundary, respectively. The composition transition took place in the Inconel 182 weld side. Σ3 boundaries in the HAZ of 316SS side and Σ5 grain boundaries in weld metal were usually observed, despite the type of fusion boundary, however the former was much more in epitaxial fusion boundary. Microhardness was continuously decreased across the random fusion boundary from the side of Inconel 182 to 316SS, but a hardening phenomenon appeared in the epitaxial fusion boundary zone because of its fine cellular microstructure.
KW - 316 stainless steel
KW - Dissimilar metal weld
KW - Fusion boundary
KW - Inconel 182 alloy
KW - Microstructure
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U2 - 10.1016/j.matchar.2015.07.018
DO - 10.1016/j.matchar.2015.07.018
M3 - Article
AN - SCOPUS:84938373601
VL - 107
SP - 255
EP - 261
JO - Materials Characterization
JF - Materials Characterization
SN - 1044-5803
ER -