Role of concurrent deformation mechanisms in improving work hardening of dual-phase medium-Mn steel containing TRIP and TWIP effects
Source abstract
Abstract
High-performance dual-phase medium Mn steel achieves a combination of high strength and good ductility through multiple concurrent deformation mechanisms, including strain gradient plasticity, transformation-induced plasticity (TRIP), and twinning-induced plasticity (TWIP). However, the specific contributions of these mechanisms to work-hardening enhancement remain unclear. By comparing the tensile behavior of commercial dual-phase steel and conventional 7Mn dual-phase TRIP steel, this study demonstrates that the TRIP effect is the most effective mechanism for improving work-hardening rate and exponent in high-performance 10Mn steel exhibiting both TRIP and TWIP effects. The TWIP effect plays a secondary role in increasing the work-hardening exponent but contributes to sustaining a high work-hardening rate over a wide strain range. In contrast, the dual-phase microstructure strengthened solely by strain gradient plasticity is insufficient to prevent the decline in work-hardening rate, making it less effective than either TRIP or TWIP effects. This study emphasizes that martensitic transformation, rather than deformation twinning, plays the primary role in optimizing the tensile properties of medium Mn steel.
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Research context
OpenAlex topics: Microstructure and Mechanical Properties of Steels · Microstructure and mechanical properties · Metal and Thin Film Mechanics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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