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2021 Vol.31, Issue 3 Preview Page
Effect of Vanadium and Boron on Microstructure and Low Temperature Impact Toughness of Bainitic Steels

베이나이트강의 미세조직과 저온 충격 인성에 미치는 바나듐과 보론의 영향

Yuanjiu Huang1
,
Hun Lee1
,
Sung Kyu Cho2
,
Jun Seok Seo2
,
Yongjai Kwon1
,
Jung Gu Lee1
,
Sang Yong Shin1†
황 원구1
,
이 훈1
,
조 성규2
,
서 준석2
,
권 용재1
,
이 정구1
,
신 상용1†
1School of Materials Science and Engineering, University of Ulsan, Ulsan 44610, Republic of Korea
2Technical Research Center, Hyundai Steel Company, Dangjin 31719, Republic of Korea
1울산대학교 첨단소재공학과
2현대제철 기술연구소
†Corresponding author E-Mail : sshin@ulsan.ac.kr (S. Y. Shin, Univ. of Ulsan)
March 2021. pp. 139-149
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Abstract

In this study, three kinds of bainitic steels are fabricated by controlling the contents of vanadium and boron. High vanadium steel has a lot of carbides and nitrides, and so, during the cooling process, acicular ferrite is well formed. Carbides and nitrides develop fine grains by inhibiting grain growth. As a result, the low temperature Charpy absorbed energy of high vanadium steel is higher than that of low vanadium steel. In boron added steel, boron segregates at the prior austenite grain boundary, so that acicular ferrite formation occurs well during the cooling process. However, the granular bainite packet size of the boron added steel is larger than that of high vanadium steel because boron cannot effectively suppress grain growth. Therefore, the low temperature Charpy absorbed energy of the boron added steel is lower than that of the low vanadium steel. HAZ (heat affected zone) microstructure formation affects not only vanadium and boron but also the prior austenite grain size. In the HAZ specimen having large prior austenite grain size, acicular ferrite is formed inside the austenite, and granular bainite, bainitic ferrite, and martensite are also formed in a complex, resulting in a mixed acicular ferrite region with a high volume fraction. On the other hand, in the HAZ specimen having small prior austenite grain size, the volume fraction of the mixed acicular ferrite region is low because granular bainite and bainitic ferrite are coarse due to the large number of prior austenite grain boundaries.

Keywords
bainitic steel plates
heat affected zone
microstructure
charpy impact properties
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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 :3
  • Pages :139-149
  • Received Date : 2021-01-29
  • Revised Date : 2021-02-08
  • Accepted Date : 2021-02-08
  • DOI :https://doi.org/10.3740/MRSK.2021.31.3.139
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