KLI

베이나이트강의 미세조직과 저온 충격 인성에 미치는 바나듐과 보론의 영향

Metadata Downloads
Alternative Title
Effect of Vanadium and Boron on Microstructure and Low Temperature Impact Toughness of Bainitic Steels
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.
Author(s)
황원구이훈조성규서준석권용재이정구신상용
Issued Date
2021
Type
Article
Keyword
bainitic steel platesheat affected zonemicrostructurecharpy impact properties
DOI
10.3740/MRSK.2021.31.3.139
URI
https://oak.ulsan.ac.kr/handle/2021.oak/8974
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_nrf_kci_oai_kci_go_kr_ARTI_9770345&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,%EB%B2%A0%EC%9D%B4%EB%82%98%EC%9D%B4%ED%8A%B8%EA%B0%95%EC%9D%98%20%EB%AF%B8%EC%84%B8%EC%A1%B0%EC%A7%81%EA%B3%BC%20%EC%A0%80%EC%98%A8%20%EC%B6%A9%EA%B2%A9%20%EC%9D%B8%EC%84%B1%EC%97%90%20%EB%AF%B8%EC%B9%98%EB%8A%94%20%EB%B0%94%EB%82%98%EB%93%90%EA%B3%BC%20%EB%B3%B4%EB%A1%A0%EC%9D%98%20%EC%98%81%ED%96%A5&offset=0&pcAvailability=true
Publisher
Korean Journal of Materials Research
Location
대한민국
Language
한국어
ISSN
1225-0562
Citation Volume
31
Citation Number
3
Citation Start Page
139
Citation End Page
149
Appears in Collections:
Engineering > Material Engineering
Authorize & License
  • Authorize공개
Files in This Item:
  • There are no files associated with this item.

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.