Effect of annealing process on microstructure and properties of 980 MPa hot dip galvanized dual-phase steel

doi:10.13251/j.issn.0254-6051.2022.11.021

Abstract

Abstract: Continuous annealing galvanizing process of 980 MPa dual-phase steel was simulated by Voestal pine thermal simulator, and the effect of soaking temperature and rapid cooling outlet temperature of continuous hot dip galvanizing process on microstructure and mechanical properties of the dual-phase steel was studied by means of tensile testing machine and optical microscope and scanning electron microscope. The results show that the microstructure of 980 MPa dual-phase steel consists of ferrite and martensite after annealing galvanizing process, and Nb, Ti carbonitrides distribute in the structure. With the increase of soaking temperature, the volume fraction of martensite increases, the yield strength and yield ratio increase. With the rapid cooling outlet temperature increasing from 340 ℃ to 430 ℃, tempering decomposition of martensite appears, which reduces the yield strength of the tested steel, but improves the elongation. When the rapid cooling outlet temperature is 400 ℃, the maximum value of the product of strength and elongation is 13.9 GPa·%. When soaked at 840 ℃ and rapid cooled at 460-480 ℃, the hot dip galvanized dual-phase steel can be obtained with the tensile strength above 980 MPa.

Key words: dual-phase steel, hot dip galvanizing, soaking temperature, rapid cooling outlet temperature, microstructure and properties

CLC Number:

TG142.1

Liu Pengfei, Yang Bo, Chen Yu, Liu Hongliang. Effect of annealing process on microstructure and properties of 980 MPa hot dip galvanized dual-phase steel[J]. Heat Treatment of Metals, 2022, 47(11): 122-125.

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