Metals and materials international

The Korean Institute of Metals and Materials (대한금속재료학회)
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Effects of Annealing Conditions on Microstructure and Mechanical Properties of Low Carbon, Manganese Transformation-Induced Plasticity Steel

Jang, Jae-Myeong;Kim, Sung-Joon;Kang, Nam-Hyun;Cho, Kyung-Mox;Suh, Dong-Woo

  • Published : 20091200
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Abstract

The effects of annealing conditions on microstructural evolution and mechanical properties have been investigated in low carbon, manganese TRIP (Mn TRIP) steel based on a 0.12C-6Mn-0.5Si-3Al alloy system. The microstructure of cold-rolled sheet subjected to annealing at 760 ${^{\circ}C}$ to 800 ${^{\circ}C}$ for 30 s to 1800 s consists of a recrystallized ferrite matrix and fine-grained austenite with a phase fraction of 25 % to 35 %. Variation of the annealing conditions remarkably influenced the characteristics of constituent phases and thus affected the tensile strength and elongation. Optimization of microstructural parameters such as grain size and fraction of constituent phases, which control the yield strength, overall work hardening, and the kinetics of straininduced martensite formation, is thus critical for obtaining an exceptional mechanical balance of the alloy.

Keywords

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