EFFECT OF STRAIN RATE ON MICROSTRUCTURE EVOLUTION AND MECHANICAL BEHAVIOR OF A LOW C HIGH Mn TRIP/TWIP STEELS

doi:10.3724/SP.J.1037.2011.00590

Acta Metall Sin

2012, Vol. 48

Issue (5): 593-600 DOI: 10.3724/SP.J.1037.2011.00590

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EFFECT OF STRAIN RATE ON MICROSTRUCTURE EVOLUTION AND MECHANICAL BEHAVIOR OF A LOW C HIGH Mn TRIP/TWIP STEELS

WU Zhiqiang¹, TANG Zhengyou¹, LI Huaying¹,ZHANG Haidong²

1. School of Materials and Metallurgy, Northeastern University, Shenyang 110819
2. MCC Capital Engineering & Research Incorporation Limited, Beijing 100176

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WU Zhiqiang, TANG Zhengyou, LI Huaying,ZHANG Haidong. EFFECT OF STRAIN RATE ON MICROSTRUCTURE EVOLUTION AND MECHANICAL BEHAVIOR OF A LOW C HIGH Mn TRIP/TWIP STEELS. Acta Metall Sin, 2012, 48(5): 593-600.

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Abstract The microstructure and mechanical properties of Fe--18Mn low carbon high manganese TRIP/TWIP steels during tensile tests in the range of initial strain rate of 1.67×10^-4---10³ s^-1 at room temperature were studied. The inverse effect of strain rate on strength of steel was produced, the strength and ductility of steels decreased with increasing strain rate in the range of quasi--static tensile strain rate of 1.67×10^-4---1.67×10^-1 s^-1. While inverse effect of strain rate on ductility of steels was produced in the range of dynamic tensile strain rate of 10¹---10³ s^-1, the strength and ductility of materials increased significantly with increasing strain rate. The tensile strength of high manganese TRIP/TWIP steels was 957 MPa and their elongation was 55.8%. These results indicated that Fe--18Mn steel had excellent mechanical properties and good fracture resistance. The higher the strain rates applied, the less martensite, the more directions of deformation twins. The microstructure evolution of the specimen was analyzed by SEM, TEM and XRD, martensitic transformation and deformation twins were produced during the tensile deformation, and adiabatic temperature rise effect made the matrix softening during the high--speed deformation.

Key words: TRIP/TWIP steel strain rate microstructure evolution martensitic transformation deformation twin

Received: 20 September 2011

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TG142.41

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2011.00590 OR https://www.ams.org.cn/EN/Y2012/V48/I5/593

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