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Korean Journal of Metals and Materials > Volume 55(5); 2017 > Article
Korean Journal of Metals and Materials 2017;55(5): 363-371. doi: https://doi.org/10.3365/KJMM.2017.55.5.363
고망간 경량철강 냉연판재의 미세조직, 인장특성 및 파괴거동에 미치는 어닐링 온도의 영향
이재현1,2, 박성준2, 문준오2, 강전연2, 박준영2, 이태호2, 조경목1
1부산대학교 재료공학부
2한국기계연구원 부설 재료연구소 철강재료연구실
Effect of Annealing Temperature on the Microstructure, Tensile Properties, and Fracture Behavior of Cold-Rolled High-Mn Light-Weight Steels
Jae-hyun Lee1,2, Seong-Jun Park2, Joonoh Moon2, Jun-Yun Kang2, Jun-Young Park2, Tae-Ho Lee2, Kyung Mox Cho1
1Department of Materials Science and Engineering, Pusan National University, Busan 46241, Republic of Korea
2Ferrous Alloy Department, Korea Institute of Materials Science, Changwon 51508, Republic of Korea
Correspondence  Seong-Jun Park ,Tel: +82-55-280-3431, Email: hyega@kims.re.kr
Kyung Mox Cho ,Tel: +82-55-280-3431, Email: chokm@pusan.ac.kr
Received: 21 October 2016;  Accepted: 21 November 2016.  Published online: 9 May 2017.
The effects of the annealing temperature on the microstructure and tensile properties of cold-rolled light-weight steels are investigated using two Fe-30Mn-xAl-0.9C alloys that contain different Al content. The initial alloy microstructure is composed of a single austenite or a mixture of austenite and ferrite depending on the nominal aluminum content. For the alloy with 9 wt% Al content, the recrystallization and grain growth of austenite occurrs depending on the annealing temperature. However, for the alloy with 11 wt% Al content, the β-Mn phase is observed after annealing for 10 min at 550~800 ℃. The β-Mn transformation kinetics is the fastest at 700 ℃. The formation of the β-Mn phase has a detrimental effect on the ductility, and this leads to significant decreases in the total elongation. The same alloy also forms κ-carbide and DO3 ordering at 550~900 ℃. The investigated alloys exhibit a fully recrystallized microstructure after annealing at 900 ℃ for 10 min, which results in a high total elongation of 25~55% with a high tensile strength of 900~1170 MPa.
Keywords: low-density steel, annealing, microstructure, beta-manganese, tensile properties, cold-rolling
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