Effect of V and heat treatment on carbon enrichment in austenite of bainitic steel

doi:10.13251/j.issn.0254-6051.2020.01.003

Abstract

Abstract: Effect of V and three different heat treatments, namely, BAT, BQ&P and DBAT processes, on carbon enrichment in austenite during isothermal transformation of high carbon (about 0.6wt%C) nano-structured bainitic steel was studied. In order to capture the microstructure evolution during each route, dilatometric measurements were carried out on a DIL805L high-resolution dilatometer. X-ray diffractometer (XRD) was used to measure and calculate the retained austenite content and its carbon content.Scanning electron microscope (SEM) was used to analyze the microstructure morphology of the experimental steel during isothermal transformation, and the content and size of M/A islands were calculated. The results show that V microalloyingc an inhibit the bainite transformation and slow down the carbon enrichment rate in the residual austenite. The carbon enrichment rates of BQ&P process and DBAT process are different under the three heat treatment processes. The carbon enrichment rates of both BQ&P and DBAT processes are higher than that of BAT process. Hence, BQ&P and DBAT processes can be used to offset the retard influence of V microalloying on bainitic transformation.

Key words: vanadium microalloying, carbon enrichment, retained austenite, bainitic steel

CLC Number:

TG156.1

Fan Pengyu, Liu Rong, Gao Guhui, Gui Xiaolu, Bai Bingzhe. Effect of V and heat treatment on carbon enrichment in austenite of bainitic steel[J]. HTM, 2020, 45(1): 11-15.

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