Effects of annealing conditions on microstructure and mechanical properties of low carbon, manganese transformation-induced plasticity steel

• Published in: Metals and materials international 2009, 15(6), , pp.909-916
• Main Authors: Jang, Jae-Myeong, Kim, Sung-Joon, Kang, Nam Hyun, Cho, Kyung-Mox, Suh, Dong-Woo
• Format: Article
• Language: English
• Subjects: Alloys; Annealing; Characterization and Evaluation of Materials; Chemistry and Materials Science; Engineering Thermodynamics; Grain size; Heat and Mass Transfer; Machines; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Mechanical properties; Metallic Materials; Metallurgy; Processes; Solid Mechanics; 재료공학
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-009-0909-7

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.