Numerical simulation of microstructure and distortion evolution behavior of C-type specimens during carburizing and quenching

doi:10.13251/j.issn.0254-6051.2024.05.011

Abstract

Abstract: Taking C-type specimen of 18Cr2Ni2MoNbA steel as the study object, the microstructure and distortion evolution behavior of the C-type specimens under suspension during carburizing and quenching were studied by using finite element method to establish a multi-field coupling model of temperature field, structure field and strain field. The results show that the calculated distortion results are in good agreement with the actual measurements. The maximum distortion is at the notch position of the C-type specimen. The maximum temperature difference between the center position of the maximum width and the surface position of the notch during cooling process appears at 2.78 s and reaches 383.437 ℃. The martensitic transformation first starts from the core of the notch position, and the content of martensite in the core of C-type specimen can generally reach over 94%. During quenching, the surface martensite transformation of the C-type specimen lags behind the core, the surface martensitic transformation content is significantly lower than that of the core under the influence of retained austenite, and the final transformation content is about 83%.

Key words: 18Cr2Ni2MoNbA steel, C-type specimen, carburizing, quenching, microstructure, distortion

CLC Number:

TG142.1

Xu Yong, Liu Ke, Deng Yaoyao, Yang Bing, Lu Hailong, Luo Yi. Numerical simulation of microstructure and distortion evolution behavior of C-type specimens during carburizing and quenching[J]. Heat Treatment of Metals, 2024, 49(5): 68-73.

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