Microstructure transformation characteristic of 4330M steel during continuous cooling process

doi:10.13251/j.issn.0254-6051.2022.07.033

Abstract

Abstract: Continuous cooling transformation test of 4330 M steel was carried out by Gleeble-3500 thermal simulation test machine, and the microstructure transformation characteristic during continuous cooling process between cooling rate of 0.8-10 ℃/s was studied. The CCT curves of the steel were determined by means of thermal dilatometry method, hardness test and color metallography. The results show that the CCT curves of the 4330M steel contain ferrite, bainite and martensite transformation region, but there is no pearlite transformation region. With the increase of cooling rate, supercooled austenite is decomposed into ferrite+granular bainite, granular bainite+lower bainite+martensite and full martensite in turn. The critical cooling rate of martensite transformation is ascertained to be about 3 ℃/s. The orientation relationship of ferrite and cementite in lower bainite is (110)_α∥(102)_Fe₃C and [111]_α//[201]_Fe₃C. Combined the Vickers hardness test and quantitative analysis of color metallography, a hardness-volume fraction model is established to predict the hardness of 4330M steel as HBW=-0.07-4.69f_F+4.02f_GB+4.63f_LB+4.82f_M.

Key words: continuous cooling transformation, microstructure, color metallography, hardness-volume fraction model

CLC Number:

TG142.1⁺1

Shen Hui, Liu Yunpeng, Si Tingzhi. Microstructure transformation characteristic of 4330M steel during continuous cooling process[J]. Heat Treatment of Metals, 2022, 47(7): 190-196.

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