Evaluation of residual stress near the weld overlay cladding by welding and post-weld heat treatment

被引:6
作者
Makoto, Udagawa [1 ]
Jinya, Katsuya [1 ]
Hiroyuki, Nishikawa [1 ]
Kunio, Onizawa [1 ]
机构
[1] Japan Atomic Energy Agency, Japan
关键词
deep hole drilling method; finite element method; post-weld heat treatment; reactor pressure vessel; sectioning method; thermal-elastic-creep analysis; weld residual stress; weld-overlay cladding;
D O I
10.1080/09507116.2012.753238
中图分类号
学科分类号
摘要
Austenitic stainless steel is welded as a cladding on the inner surface of a reactor pressure vessel (RPV) made of low alloy steel. In order to assess the structural integrity of the RPV precisely, the residual stress distribution caused by weld-overlay cladding and post-weld heat treatment (PWHT) is evaluated. Since the cladding layer is very thin compared to the vessel wall, it is necessary to evaluate the residual stress distribution around the weld fusion line, which can be very steep. In this study, cladded specimens were fabricated using different welding methods. Residual stress measurements using both sectioning and deep hole drilling (DHD) methods were then performed to evaluate the residual stress distributions through the weld fusion line. Three-dimensional thermal-elastic-plastic-creep analyses based on the finite element method were also conducted to evaluate the residual stress caused by weld-overlay cladding and PWHT. It was shown that analytical results provided reasonable agreements on weld residual stress with experimental results. It was also clarified that the main cause of residual stress due to welding and PWHT was the difference of thermal expansion between weld and base metals. © 2013 © 2013 Taylor & Francis.
引用
收藏
页码:521 / 534
页数:13
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