Research and development of galvannealing dual-phase steel DP980

doi:10.13251/j.issn.0254-6051.2024.04.006

Abstract

Abstract: On the basis of laboratory test and research, galvannealed dual-phase steel DP980-GA was successfully developed relying on industrial continuous galvanizing line (CGL). The results show that microstructure of the steel substrate is composed of ferrite, martensite and a small amount of bainite. The phase structure of the coating is composed of thin Γ layer with 0.6 μm thickness near the substrate, principal phase δ and a small amount of ζ phase, where the Fe content in the coating is around 10.5%. The mechanical properties of the DP980-GA steel product show low yield ratio (0.624), good elongation and hole expansion ratio. The industrial mass produced products were applied to parts such as A pillar inner, of which the process capacity of yield strength, tensile strength and elongation is controlled stably.

Key words: galvannealing, DP980 dual-phase steel, microstructure, coating phase structure

CLC Number:

TG156.2

Zhang Liang, Huang Xueqi, Liu Libin, Li Zhen, Xie Chunqian, Shi Chang, Liu Xingquan. Research and development of galvannealing dual-phase steel DP980[J]. Heat Treatment of Metals, 2024, 49(4): 34-37.

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