Thermomechanical modelling of weld microstructure and residual stresses in P91 steel pipe

被引：12

作者：

Yaghi, A.H. ^{[1
]}

Hyde, T.H. ^{[1
]}

Becker, A.A. ^{[1
]}

Sun, W. ^{[1
]}

机构：

[1] Department of Mechanical, Materials and Manufacturing Engineering, University of Nottingham

来源：

Energy Materials: Materials Science and Engineering for Energy Systems | 2009年 / 4卷 / 03期

关键词：

Columnar; Equiaxed; FE; Martensite; P91; weld;

D O I：

10.1179/174892310X12779109287084

中图分类号：

学科分类号：

摘要：

A multipass circumferentially butt welded P91 steel pipe, typically used for high temperature applications in power plants, has been numerically analysed to determine residual stresses, induced by the process of welding, as well as microstructural regions in the weld, caused by thermal cycles. The finite element (FE) method has been applied to simulate residual stresses generated in the weld region and heat affected zone (HAZ), which are then validated by published experimental data. The axisymmetric FE simulation incorporates solid state phase transformation by allowing for volumetric changes and associated changes in yield stress and hardening behaviour due to austenitic and martensitic transformations. The thermal cycles during welding cause different microstructural regions to emerge within the weld metal and HAZ. Columnar and equiaxed microstructural zones have been numerically modelled in the weld region of the pipe. The predicted FE microstructural regions have been corroborated by columnar and equiaxed zones that have been mapped out on a cross-sectional macroimage of the weld. © 2011 Institute of Materials, Minerals and Mining and W. S. Maney & Son Ltd.

引用

页码：113 / 123

页数：10

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