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2016 Vol.26, Issue 6 Preview Page
Effect of Grain Size on the Tensile Properties of an Austenitic High-Manganese Steel

오스테나이트계 고망간강의 인장 특성에 미치는 결정립 크기의 영향

Sang-In Lee
,
Yun Cho
,
Byoungchul Hwang†
이 상인
,
조 윤
,
황 병철†
Department of Materials Science and Engineering Seoul National University of Science and Technology, Seoul 01811, Republic of Korea
서울과학기술대학교 신소재공학과
†Corresponding author bhwang@seoultech.ac.kr (B. Hwang, Seoul Nat’l Univ. Sci. Technol.)
June 2016. pp. 325-331
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Abstract

This paper presents a study of the tensile properties of austenitic high-manganese steel specimens with different grain sizes. Although the stacking fault energy, calculated using a modified thermodynamic model, slightly decreased with increasing grain size, it was found to vary in a range of 23.4 mJ/m2 to 27.1 mJ/m2. Room-temperature tensile test results indicated that the yield and tensile strengths increased; the ductility also improved as the grain size decreased. The increase in the yield and tensile strengths was primarily attributed to the occurrence of mechanical twinning, as well as to the grain refinement effect. On the other hand, the improvement of the ductility is because the formation of deformation-induced martensite is suppressed in the high-manganese steel specimen with small grain size during tensile testing. The deformationinduced martensite transformation resulting from the increased grain size can be explained by the decrease in stacking fault energy or in shear stress required to generate deformation-induced martensite transformation.

Keywords
austenitic
high-manganese steel
grain size
tensile properties
deformation-induced martensite transformation
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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 : 26
  • No :6
  • Pages :325-331
  • Received Date : 2016-04-12
  • Revised Date : 2016-05-02
  • Accepted Date : 2016-05-12
  • DOI :https://doi.org/10.3740/MRSK.2016.26.6.325
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