Effect of double annealing on microstructure and mechanical properties of Mn-TRIP steel

A novel double annealing process was applied to a Mn-TRIP steel. As a result, a great combination of yield strength of 829MPa, tensile strength of 1132MPa and total elongation of 42.1% was obtained. The improvement of mechanical property was contributed to microstructure evolution. By double anneali...

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Bibliographic Details
Published in:Journal of physics. Conference series 2022-11, Vol.2368 (1), p.12019
Main Authors: Sun, Xiaoyu, Hu, Zhiping, Li, Yang, Lei, Aidi, Liu, Rendong
Format: Article
Language:English
Subjects:
Annealing
Austenite
Cementite
Elongation
Grains
Mechanical properties
Microstructure
Physics
Tensile strength
TRIP steels
Yield strength
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Summary:A novel double annealing process was applied to a Mn-TRIP steel. As a result, a great combination of yield strength of 829MPa, tensile strength of 1132MPa and total elongation of 42.1% was obtained. The improvement of mechanical property was contributed to microstructure evolution. By double annealing process, ferrite grains were refined and VC could effectively precipitate instead of cementite, which contributed to the enhancement of yield strength. Austenite fraction was increased and two types of austenite morphology (block and lath) were obtained. In addition, Mn partitioning was promoted, leading to high Mn enrichment in austenite grains. Consequently, the austenite grains with high stability provided continuous and active TRIP effect, contributing to a great work-hardening behavior and increasing strength and ductility.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/2368/1/012019