Effect of intercritical annealing temperature on microstructure and mechanical properties of 0.2C-8Mn-2Al steel for auto

doi:10.13251/j.issn.0254-6051.2024.09.040

Abstract

Abstract: Effects of intercritical annealing temperature on the microstructure and mechanical properties of hot rolled 0.2C-8Mn-2Al steel were studied by using scanning electron microscope (SEM) and tensile testing. The results show that microstructure of the annealed 0.2C-8Mn-2Al steel is mainly composed of austenite and ferrite. In the range of 780 ℃ to 900 ℃, with the increase of annealing temperature, the volume fraction of austenite transformation in the 0.2C-8Mn-2Al steel before and after stretching gradually increases. Meanwhile, the tensile strength, elongation and product of strength and elongation of the 0.2C-8Mn-2Al steel first increase and then decrease. The austenite transformation volume fraction of the 0.2C-8Mn-2Al steel annealed at 900 ℃ is the highest, reaching 43.4%. The tensile strength, elongation and product of strength and elongation of the 0.2C-8Mn-2Al steel annealed at 840 ℃ reach maximum values, which are 1208.6 MPa, 31.2% and 37.71 GPa·%, respectively. 840 ℃ is the optimal annealing temperature for the hot rolled 0.2C-8Mn-2Al steel.

Key words: 0.2C-8Mn-2Al steel, intercritical annealing, microstructure, mechanical properties

CLC Number:

TG161

Cao Zhongyu, Jia Huapo, Zhao Baowei. Effect of intercritical annealing temperature on microstructure and mechanical properties of 0.2C-8Mn-2Al steel for auto[J]. Heat Treatment of Metals, 2024, 49(9): 247-250.

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