Quantifying the metallurgical response of a nuclear steel to welding thermal cycles
Quantifying the metallurgical response of a nuclear steel to welding thermal cycles
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DOI：
10.1080/02670836.2015.1132529
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发表时间：
2016-02
影响因子：
1.8
通讯作者：
N. O’Meara;H. Abdolvand;J. Francis;S. Smith;P. Withers
中科院分区：
文献类型：
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作者：
N. O’Meara;H. Abdolvand;J. Francis;S. Smith;P. Withers
由于与相变相关的应变和力学性能的相关变化，固态相变可以极大地影响焊缝应力的演变。因此，焊接残余应力的有限元预测需要可靠的材料数据，包括相变动力学信息以及依赖于相和温度的材料特性。由于此类数据的缺乏，许多作者使用未经校准的经验建模方法来预测焊接残余应力。本文解决了一种重要的核压力容器（SA508）钢的这一严重短缺问题。给出了奥氏体形成、晶粒生长和分解的数据，并随后用于校准转变模型。实验结果表明，该模型能较准确地预测微观结构和残余应力。本文是关于残余应力的测量、建模和缓解的主题问题的一部分。
Solid-state phase transformations can drastically influence the evolution of stress in welds due to the strains associated with the transformations and related changes in mechanical properties. As such, finite-element predictions of welding residual stresses need reliable materials data including, where applicable, information on phase transformation kinetics and phase- and temperature-dependent material properties. Owing to a scarcity of such data, many authors have used uncalibrated empirical modelling approaches for the prediction of welding residual stresses. This paper addresses this critical shortage for an important nuclear pressure vessel (SA508) steel. Austenite formation, grain growth and decomposition data are presented and subsequently used to calibrate transformation models. These models are shown to accurately predict microstructure and residual stresses for experimental test cases. This paper is part of a Themed Issue on Measurement, modelling and mitigation of residual stress.