scholarly journals Evolution of a low-alloy steel/nickel superalloy dissimilar metal weld during post-weld heat treatment

2021 ◽  
Author(s):  
C.V. da Silva Lima ◽  
M. Verdier ◽  
F. Robaut ◽  
J. Ghanbaja ◽  
G. Badinier ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Alloy Steel ◽  
Nickel Superalloy ◽  
Post Weld Heat Treatment ◽  
Low Alloy Steel ◽  
Dissimilar Metal ◽  
Dissimilar Metal Weld ◽  
Metal Weld ◽  
Weld Heat

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.

Effects of thermal aging on microstructures of low alloy steel–Ni base alloy dissimilar metal weld interfaces

2013 ◽  
Vol 441 (1-3) ◽  
pp. 493-502 ◽  
Author(s):  
Kyoung Joon Choi ◽  
Jong Jin Kim ◽  
Bong Ho Lee ◽  
Chi Bum Bahn ◽  
Ji Hyun Kim
Keyword(s):  
Alloy Steel ◽  
Thermal Aging ◽  
Base Alloy ◽  
Low Alloy Steel ◽  
Dissimilar Metal ◽  
Dissimilar Metal Weld ◽  
Metal Weld

Alternative Approach for Qualification of Temperbead Welding in the Nuclear Industry

2012 ◽  
Author(s):  
Steven L. McCracken ◽  
Richard E. Smith
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Alloy Steel ◽  
Nuclear Power ◽  
Post Weld Heat Treatment ◽  
Nuclear Power Industry ◽  
Low Alloy Steels ◽  
Low Alloy Steel ◽  
Alloy Steels ◽  
Weld Heat

Temperbead welding is common practice in the nuclear power industry for in-situ repair of quenched and tempered low alloy steels where post weld heat treatment is impractical. The temperbead process controls the heat input such that the weld heat-affected-zone (HAZ) in the low alloy steel is tempered by the welding heat of subsequent layers. This tempering eliminates the need for post weld heat treatment (PWHT). Unfortunately, repair organizations in the nuclear power industry are experiencing difficulty when attempting to qualify temperbead welding procedures on new quenched and tempered low alloy steel base materials manufactured to modern melting and deoxidation practices. The current ASME Code methodology and protocol for verification of adequate fracture toughness in materials was developed in the early 1970s. This paper reviews typical temperbead qualification results for vintage heats of quenched and tempered low alloy steels and compares them to similar test results obtained with modern materials of the same specification exhibiting superior fracture toughness.

Fracture assessment for a dissimilar metal weld of low alloy steel and Ni-base alloy

2012 ◽  
Vol 90-91 ◽  
pp. 61-68 ◽  
Author(s):  
Takuya Ogawa ◽  
Masao Itatani ◽  
Toshiyuki Saito ◽  
Takahiro Hayashi ◽  
Chihiro Narazaki ◽  
...  
Keyword(s):  
Alloy Steel ◽  
Base Alloy ◽  
Low Alloy Steel ◽  
Dissimilar Metal ◽  
Fracture Assessment ◽  
Dissimilar Metal Weld ◽  
Metal Weld
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