Deformation behavior of Q&P steel with ultrafine-grained ferrite matrix under constant stress

doi:10.13251/j.issn.0254-6051.2023.03.029

Abstract

Abstract: Pre-quenching heat treatment process was adopted to obtain Q&P steel with ultrafine-grained ferrite. The microstructure evolution and deformation behavior of the tested steel under a constant stress were studied through a load-holding control experiment. The results show that the mount of strain increases gradually with the increasing of holding stress, and the strain increases slightly with the prolonging of the holding time. When loading stress is lower than the yield stress, the strain does not change with the prolonging of the load-holding time. When loading stress is higher than the yield stress, the amount of strain increases significantly and the strain-induced transformation from retained austenite to martensite occurs during the deformation process. In addition, the stability of retained austenite first decreases and then increases with the increase of strain.

Key words: Q&P steel, pre-quenching process, load-holding control experiment, retained austenite stability, TRIP effect

CLC Number:

TG161

Ma Wanwan, Tang Zhengyou, Cheng Chi, Zhao Li, Ding Hua. Deformation behavior of Q&P steel with ultrafine-grained ferrite matrix under constant stress[J]. Heat Treatment of Metals, 2023, 48(3): 174-178.

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