August 21, 2025MetalsOpen Access

Effect of Heat Treatment Temperature on the Microstructure and Mechanical Properties of Fe-18Mn-0.6C-xAl

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Yield strength increased from 357 to 461 MPa with the addition of 5 wt.% aluminum, enhancing mechanical properties.
Charpy impact energy improved significantly, rising from 56 J to 119 J at room temperature with added aluminum.
Heat-treated at 600 °C, the deformation mechanism transformed to twinning plus strong planar slip as aluminum content increased.
Although aging embrittlement exists, aluminum addition reduces the brittle zone in high-Mn steels, improving toughness.

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Heat treatment enhances yield strength and toughness in high-Mn steels, suggesting potential for cryogenic applications.

Li et al. (2025) studied this question.

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