配分时间对Q&P钢力学性能及显微组织的影响<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.04.019

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Abstract Based on the regulating and controlling theory of thermodynamic, the microstructure evolution and mechanical properties of a new designed medium-carbon-manganese steel after Q&P process was studied by SEM,EBSD and TEM. The mecha-nical properties was tested,and the evolution mechanism of retained austenite was discussed by XRD. The results indicated that the microstructure was consisted of lath martensite and dispersively distributed retained austenite; the retained austenite was emerged in the form of thin film between martensite laths and blocks along the grain boundaries; the strength decreased and the elongation increased with the increase of partition time; the fraction of retained austenite decreased from 6.94%-10.78% to 3.5%-4.5% after tensile test, which indicated the occurrence of TRIP effect and the increase of ductility.

Key words： Q&P process microstructure retained austenite partition time

Published: 02 May 2018

CLC number:

TG151.2

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.04.019 OR http://www.mater-rep.com/EN/Y2017/V31/I4/83

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