Modeling of numerical simulation and experimental verification for carburizing-nitriding quenching process
(1.High-Tech Research Center Special Researcher, Saitama Institute of Technology, Fukaya 369-0293, Japan
2.Department of Mechanical Engineering, Saitama Institute of Technology, Fukaya 369-0293, Japan
3.Research Center of High Technology, Anshan University of Science and Technology, Anshan 114044, China
4.Department of Technology Development, Tobuyakin Ltd., Japan)
2.Department of Mechanical Engineering, Saitama Institute of Technology, Fukaya 369-0293, Japan
3.Research Center of High Technology, Anshan University of Science and Technology, Anshan 114044, China
4.Department of Technology Development, Tobuyakin Ltd., Japan)
Abstract: A model considering quantitative effects of diffused carbon and nitrogen gradients and kinetics of phase transformation is presented to examine metallo-thermo-mechanical behavior during carburized and nitrided quenching. Coupled simulation of diffusion, phase transformation and stress/strain provides the final distribution of carbon and nitrogen contents as well as residual stress and distortion. Effects of both transformation and lattice expansion induced by carbon and nitrogen absorption were introduced into calculating the evolution of the internal stress and strain. In order to verify the method and the results, the simulated distributions of carbon and nitrogen content and residual stress/strain of a ring model during carburized and nitrided quenching were compared with the measured data.
Key words: carburizing; nitriding; quenching; numerical simulation; metallo-thermo-mechanical behavior