Effect of heating temperature on microstructure and properties of 34MnB5 hot forming steel

doi:10.13251/j.issn.0254-6051.2023.03.023

Abstract

Abstract: Gleeble3500 thermal simulation machine was used to simulate annealing of 34MnB5 steel after continuous acid rolling. The optimum annealing temperature was analyzed and the flat die quenching test of different hot stamping processes was carried out. The effect of annealing temperature and quenching temperature on microstructure and properties of the hot formed steel was studied. The results show that when the annealing temperature is 790 ℃, the banded structure is almost disappeared, the equiaxation degree of grains is higher, the mixed grain phenomenon is improved obviously, the bainite grain structure is refined, and the two phases of ferrite and bainite are evenly distributed in the matrix. When annealing temperature is 790 ℃, quenching temperature is 930 ℃ and holding time is 5 min, the microstructure is fine and uniform lath martensite, and the comprehensive mechanical properties are the best. Yield strength reaches 1353 MPa, tensile strength reaches 2018 MPa, elongation reaches 7.5%, and the transverse and longitudinal three-point bending angle reach more than 50°.

Key words: annealing temperature, flat die quenching, hot forming steel

CLC Number:

Tian Xiugang, Wang Zhao, Sun Xu, Zhang Jingyu, Lu Zhiqiang, Han Xue. Effect of heating temperature on microstructure and properties of 34MnB5 hot forming steel[J]. Heat Treatment of Metals, 2023, 48(3): 135-138.

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