Effect of pretreatment process on microstructure and mechanical properties of medium manganese TRIP steel

doi:10.13251/j.issn.0254-6051.2023.05.040

Abstract

Abstract: Microstructure evolution and change of mechanical properties of the 0.2C-5Mn-1.5Al-0.5Si medium manganese TRIP steel after different pretreatments and intercritical annealing treatment were systematically studied by means of scanning electron microscope (SEM), X-ray diffractometer (XRD) and tensile testing machine. The results show that with the shortening of pretreatment time, the pearlite content does not change, but the ferrite and martensite grains are refined. When intercritically annealed at 730 ℃ for 5 min, two kinds of retained austenite in the form of block and film appear in the microstructure. The grains of austenite and ferrite in the steel under shorter pretreatment time are finer. It is found that the tensile strength and elongation of the tested steel under shorter pretreatment time are generally higher than those under longer pretreatment time. Under the process with a shorter pretreatment time, the optimal mechanical properties are obtained after annealing, with elongation of 34%, the product of strength and elongation of 34.34 GPa·%, and there is no yield extension phenomenon during the tensile process, with good work hardening ability.

Key words: medium manganese TRIP steel, pretreatment, microstructure evolution, mechanical properties, austenite

CLC Number:

TG142.1

Zhang Guangying, Ding Wei, Li Yan, Feng Jike, Dong Rui. Effect of pretreatment process on microstructure and mechanical properties of medium manganese TRIP steel[J]. Heat Treatment of Metals, 2023, 48(5): 259-264.

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