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2021 Vol.31, Issue 9 Preview Page
Effect of Al Addition on the Cryogenic-Temperature Impact Properties of Austenitic Fe-23Mn-0.4C Steels

알루미늄 첨가에 따른 오스테나이트계 Fe-23Mn-0.4C 고망간강의 극저온 충격 특성

Sang-Gyu Kim
,
Jae-Yoon Kim
,
Tae-Hee Yun
,
Byoungchul Hwang†
김 상규
,
김 재윤
,
윤 태희
,
황 병철†
Department of Materials Science and Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea
서울과학기술대학교 신소재공학과
†Corresponding author E-Mail : bhwang@seoultech.ac.kr (B. Hwang, Seoul Nat’l Univ. Sci. and Technol.)
September 2021. pp. 519-524
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Abstract

The impact properties of two austenitic Fe-23Mn-0.4C steels with different Al contents for cryogenic applications are investigated in this study. The 4Al steel consists mostly of austenite single-phase microstructure, while the 5Al steel exhibits a two-phase microstructure of austenite and delta-ferrite with coarse and elongated grains. Charpy impact test results reveal that the 5Al steel with duplex phases of austenite and delta-ferrite exhibits a ductile-to-brittle transition behavior, while the 4Al steel with only single-phase austenite has higher absorbed energy over 100 J at -196 °C. The SEM fractographs of Charpy impact specimens show that the 4Al steel has a ductile dimple fracture regardless of test temperature, whereas the 5Al steel fractured at -100 °C and -196 °C exhibits a mixed fracture mode of both ductile and brittle fractures. Additionally, quasi-cleavage fracture caused by crack propagation of delta-ferrite phase is found in some regions of the brittle fracture surface of the 5Al steel. Based on these results, the delta-ferrite phase hardly has a significant effect on absorbed energy at room-temperature, but it significantly deteriorates low-temperature toughness by acting as the main site of the propagation of brittle cracks at cryogenic-temperatures.

Keywords
high-manganese
austenitic steel
impact property
cryogenic
ductile-to-brittle transition behavior
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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 : 31
  • No :9
  • Pages :519-524
  • Received Date : 2021-08-14
  • Revised Date : 2021-08-21
  • Accepted Date : 2021-09-05
  • DOI :https://doi.org/10.3740/MRSK.2021.31.9.519
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