Effects of annealing conditions on microstructure and mechanical properties of low carbon, manganese transformation-induced plasticity steel |
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Authors: | Jae-Myeong Jang Sung-Joon Kim Nam Hyun Kang Kyung-Mox Cho Dong-Woo Suh |
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Affiliation: | (1) Graduate Institute of Ferrous Technology (GIFT), Pohang University of Science and Technology (POSTECH), Pohang, 790-784, Korea;(2) Structural Materials Division, Korea Institute of Materials Science, Changwon, Kyungnam, 641-010, Korea |
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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 °C to 800 °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 strain-induced martensite formation, is thus critical for obtaining an exceptional mechanical balance of the alloy. |
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