Effect of post-weld heat treatment on fusion boundary microstructure in dissimilar metal welds for subsea service

2017 ◽  
Vol 59 (6) ◽  
pp. 547-554 ◽  
Author(s):  
Carolin Fink ◽  
Boian T. Alexandrov
Keyword(s):  
Heat Treatment ◽  
Post Weld Heat Treatment ◽  
Fusion Boundary ◽  
Dissimilar Metal ◽  
Boundary Microstructure ◽  
Weld Heat

The Formation and Control of Laves Phase in K418 and 42CrMo Dissimilar Metal Laser Weld

2012 ◽  
Vol 166-169 ◽  
pp. 1839-1842 ◽  
Author(s):  
Ming Pang ◽  
Chang Zhen Liu ◽  
Guang Hui Xu ◽  
Jun Hua Ma
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Post Weld Heat Treatment ◽  
Laves Phase ◽  
Laser Weld ◽  
Dissimilar Metal ◽  
Weld Metals ◽  
Transmission Electron ◽  
And Control ◽  
Weld Heat

The effect of K418 and 42CrMo dissimilar metal laser welding velocity, temperature of post-weld heat treatment on controlling formation of laves phase were investigated. Microstructure and laves phase were characterized by optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM).Results showed that Laves phase formed in the interdendritic regions of the weld metals as a result of segregation. The morphology and composition of Laves phase depended strongly on heat input/cooling rate and influenced its response to subsequent homogenization post-weld heat treatment.

Residual Stress Predictions on a 29″ Narrow Gap Dissimilar Metal Weld and Comparison With a 14″ Configuration

2012 ◽  
Author(s):  
Stéphan Courtin ◽  
Xavier Ficquet ◽  
Thi Thuy Trang Lê ◽  
Philippe Gilles ◽  
Miguel Yescas
Keyword(s):  
Heat Treatment ◽  
Residual Stress ◽  
Post Weld Heat Treatment ◽  
Thickness Effect ◽  
Narrow Gap ◽  
Welding Simulation ◽  
Dissimilar Metal ◽  
Dissimilar Metal Weld ◽  
Metal Weld ◽  
Weld Heat

AREVA has developed narrow gap weld techniques to perform junctions between low alloy steel heavy section components and austenitic stainless steel piping systems. In parallel, for a good understanding of welding and post weld heat treatment consequences, numerical welding simulation has already demonstrated its relevance to predict residual stress fields in welded components [1]. This paper presents Finite Element (FE) simulations of a 29″ multipass narrow gap Dissimilar Metal Weld (DMW) configuration, the welding simulation including non linear kinematic hardening models, phase transformations and visco-plastic calculations for reproducing the post weld heat treatment. The numerical results are compared to measurements obtained by the deep hole drilling technique [2]. This work gives another evidence of the relevance of the numerical welding simulation. Particularly, the comparison with a 14″ configuration [3] gives some elements to assess on the validity of both numerical and experimental techniques and on the weld thickness effect.

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