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

Authors: Dongsong Rong; Yong Jiang; Jianming Gong; Yawei Peng

Addresses: School of Mechanical Engineering, Yancheng Institute of Technology, Yancheng 224051, China ' School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 210009, China ' School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 210009, China ' School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 210009, China

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.

Keywords: residual stress; numerical model; austenitic stainless steel; carbon diffusity; low temperature colossal carburisation; LTCC.

DOI: 10.1504/IJCMSSE.2018.095332

International Journal of Computational Materials Science and Surface Engineering, 2018 Vol.7 No.3/4, pp.231 - 242

Received: 01 Dec 2016
Accepted: 19 Sep 2017

Published online: 28 Sep 2018 *

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