Effect of intercritical annealing on microstructure and properties of ferrite/bainite dual-phase steel

doi:10.13251/j.issn.0254-6051.2024.05.026

Abstract

Abstract: Effect of intercritical annealing process on microstructure and mechanical properties of ferrite/bainite dual-phase steel was studied by means of thermal simulation test machine, microhardness tester, electronic universal tensile testing machine, optical microscope and scanning electron microscope. The results show that under traditional intercritical annealing process, the microstructure is composed of ferrite, bainite and a small amount of martensite, and showing banded structures. The quenching+intercritical annealing process can refine the microstructure, obtain lath ferrite/bainite dual-phase structures, and inhibit the formation of martensite. Moreover, different processes obtain similar volume fractions of ferrite. Compared with the traditional intercritical annealing process, the quenching+intercritical annealing process can significantly reduce yield ratio and improve elongation of the tested steel.

Key words: dual-phase steel, bainite, intercritical annealing, mechanical properties

CLC Number:

TG161

Shi Lei, Tian Pengyong, Shi Ying, Bai Xue, Yang Fang. Effect of intercritical annealing on microstructure and properties of ferrite/bainite dual-phase steel[J]. Heat Treatment of Metals, 2024, 49(5): 158-161.

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