Numerical simulation of residual stress in low temperature colossal carburised layer on austenitic stainless steel

D. Rong, Yong Jiang, J. Gong, Yawei Peng
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Abstract

A numerical model is proposed to quantitatively characterise the residual stress evolutions in low temperature colossal carburised layer on austenitic stainless steel. In this model, on the basis of the consideration of concentration and stress dependent carbon diffusivity, prediction of the carbon concentration distribution and growth regularity of carburised layer is performed. The strain rate is discussed taking the compositive effects of residual stress and carbon concentration gradient. Based on the strain compatibility of carburised layer and substrate, the residual stress is calculated. Meanwhile, a low temperature colossal carburisation experiment is carried out on 316L austenitic stainless steel and the carbon concentration and residual stress are measured to verify the validity of the model. The numerical results of carbon concentration and residual stress distributions agree with the experimental data, indicating that the numerical model established in this paper can be used to investigate the process of low temperature colossal carburisation.
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奥氏体不锈钢低温巨渗碳层残余应力的数值模拟
提出了一个定量描述奥氏体不锈钢低温巨渗碳层残余应力演变的数值模型。在该模型中,在考虑浓度和应力依赖的碳扩散率的基础上,对渗碳层的碳浓度分布和生长规律进行了预测。考虑残余应力和碳浓度梯度的综合影响,讨论了应变速率。基于渗碳层与基体的应变相容性,计算了渗碳层的残余应力。同时,对316L奥氏体不锈钢进行了低温巨渗碳实验,测量了碳浓度和残余应力,验证了模型的有效性。碳浓度和残余应力分布的数值结果与实验数据一致,表明本文建立的数值模型可用于研究低温巨渗碳过程。
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来源期刊
CiteScore
1.20
自引率
0.00%
发文量
3
期刊介绍: IJCMSSE is a refereed international journal that aims to provide a blend of theoretical and applied study of computational materials science and surface engineering. The scope of IJCMSSE original scientific papers that describe computer methods of modelling, simulation, and prediction for designing materials and structures at all length scales. The Editors-in-Chief of IJCMSSE encourage the submission of fundamental and interdisciplinary contributions on materials science and engineering, surface engineering and computational methods of modelling, simulation, and prediction. Papers published in IJCMSSE involve the solution of current problems, in which it is necessary to apply computational materials science and surface engineering methods for solving relevant engineering problems.
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