Microstructure and properties of 1.5Al medium-manganese steel after short time intercritical annealing

doi:10.13251/j.issn.0254-6051.2022.05.022

Abstract

Abstract: Thermodynamic process window, microstructure and mechanical properties of 0.2C-5Mn-0.5Si-1.5Al medium manganese TRIP steel were studied by means of thermodynamic software, scanning electron microscopy (SEM), X-ray diffractometer (XRD) and tensile test, based on which, the effect of short time intercritical annealing temperature on microstructure evolution and mechanical properties of the tested steel was analyzed. The thermodynamic calculation results show that the optimal intercritical annealing temperature range is 640-670 ℃, and the actual optimal annealing temperature shifts to the right about 70 ℃. At the low temperature stage (700 ℃), the carbides are not completely dissolved, while at the high temperature stage (760-820 ℃), the stability of austenite decreases and martensite appears in the microstructure, which corresponding to both sides of the optimal process window respectively. After intercritical annealed at 730 ℃, the carbides are completely dissolved and the austenite is stable enough, the microstructure is composed of ferrite and austenite, and the optimal mechanical properties can be obtained, with the tensile strength of 1041 MPa, the yield strength of 921 MPa, the elongation of 42%, and the strength-elongation product being close to 43 GPa·%.

Key words: medium manganese steel, short time intercritical annealing, retained austenite, mechanical properties

CLC Number:

TG156.21

Feng Jike, Ding Wei, Li Yan, Zhang Guangyin, Zhang Nan. Microstructure and properties of 1.5Al medium-manganese steel after short time intercritical annealing[J]. Heat Treatment of Metals, 2022, 47(5): 136-140.

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