Estimation of residual stresses in an 800 mm thick steel submerged arc weldment

被引:29
|
作者
Mitra, Abhishek [1 ,2 ]
Prasad, N. Siva [3 ]
Ram, G. D. Janaki [1 ]
机构
[1] Indian Inst Technol Madras, Madras 600036, Tamil Nadu, India
[2] Indira Gandhi Ctr Atom Res, Kalpakkam 603102, Tamil Nadu, India
[3] GITAM Univ, Sch Technol, Hyderabad 502329, Andhra Pradesh, India
关键词
Narrow gap welding; Residual stress; Finite element method; Ferritic steel; Phase transformation; Post-weld heat treatment; SIMULATION; JOINT; PIPE;
D O I
10.1016/j.jmatprotec.2015.09.007
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Assuming plane strain conditions and taking phase transformations into account, finite element analysis was carried out using a bead-by-bead deposition model as well as two different lumped models. The effects of post-weld heat treatment at 600 degrees C were also studied. Predicted residual stresses were verified using X-ray diffraction method. While both bead-by-bead and lumped models were found to overestimate the maximum residual stress in as-welded condition, the latter facilitated a safer upper-bound estimate of the residual stress. The net tensile stress in the weld metal was found to decrease as a result of solid-state transformation of austenite to ferrite. Further, a significant part of stress relief was found to occur in the first half hour of the holding time during post-weld heat treatment. A formula was developed for estimating the maximum residual stress in post-weld heat treated condition. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码:181 / 190
页数:10
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