Effect of Intercritical Annealing on Microstructure and Mechanical Properties of Fe-9Mn-0.2C-3Al-0.5Si Medium Manganese Steels Containing Cu and Ni

Seung-Wan Lee; Seung-Hyuk Sin; Byoungchul Hwang

doi:10.3740/MRSK.2020.30.1.44

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2020 Vol.30, Issue 1 Preview Page

Effect of Intercritical Annealing on Microstructure and Mechanical Properties of Fe-9Mn-0.2C-3Al-0.5Si Medium Manganese Steels Containing Cu and Ni 구리와 니켈이 포함된 Fe-9Mn-0.2C-3Al-0.5Si 중망간강의 미세조직과 기계적 특성에 미치는 2상역 어닐링의 영향

January 2020. pp. 44-49

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Abstract

The effect of intercritical annealing temperature on the microstructure and mechanical properties of Fe-9Mn-0.2C-3Al-0.5Si medium manganese steels containing Cu and Ni is investigated in this study. Six kinds of medium manganese steels are fabricated by varying the chemical composition and intercritical annealing temperature. Hardness and tensile tests are performed to examine the correlation of microstructure and mechanical properties for the intercritical annealed medium manganese steels containing Cu and Ni. The microstructures of all the steels are composed mostly of lath ferrite, reverted austenite and cementite, regardless of annealing temperature. The room-temperature tensile test results show that the yield and tensile strengths decrease with increasing intercritical annealing temperature due to higher volume fraction and larger thickness of reverted austenite. On the other hand, total and uniform elongations, and strain hardening exponent increase due to higher dislocation density because transformation-induced plasticity is promoted with increasing annealing temperature by reduction in reverted austenite stability.

Keywords

medium manganese steel

intercritical annealing

tensile property

reverted austnite

austenite stability

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Information

Publisher :Materials Research Society of Korea
Publisher(Ko) :한국재료학회
Journal Title :Korean Journal of Materials Research
Journal Title(Ko) :한국재료학회지
Volume : 30
No :1
Pages :44-49
Received Date : 2019-11-25
Revised Date : 2019-12-21
Accepted Date : 2019-12-24
DOI :https://doi.org/10.3740/MRSK.2020.30.1.44

Korean Journal of Materials Research ISSN:1225-0562(Print) 2287-7258(Online) 한국재료학회지

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