Effect of strain rate on microstructure and properties ofhigh strength steel for automobile

doi:10.13251/j.issn.0254-6051.2020.09.012

Abstract

Abstract: High speed impact compression tests of QP980 and TRIP590 steel were carried out under different strain rates by means of split Hopkinson pressure bar testing machine and scanning electron microscope.The microstructure and properties of the two kinds of high strength steel for automobile under different strain rates were analyzed.The results show that the relative error between the calculated stress and the measured stress of the steels is 1.2%-3.3%,which is small and stable,so the experimental data are basically consistent with the two wave formula.The engineering stress of the two kinds of high strength steel for automobile increases with the increase of strain rate,but the maximum engineering stress of QP980 steel plate is larger than that of TRIP590 steel plate.After impact test,the microstructure of QP980 steel plate becomes more lath and fine,and the microstructure is uniform ferrite and martensite.While the microstructure of TRIP590 steel plate after impact becomes coarse and uneven,and with the increase of strain rate,the ferrite in the original structure gradually expands to the surroundings during the extrusion process,the bainite is covered by the larger ferrite structure,and the martensite content increases.

Key words: high strength steel, strain rate, microstructure, mechanical properties

CLC Number:

TG306

Hou Yudong, Jing Cainian, Ding Xiaoyun, Wu Cong. Effect of strain rate on microstructure and properties ofhigh strength steel for automobile[J]. Heat Treatment of Metals, 2020, 45(9): 71-76.

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