Correlation between Microstructure and Mechanical Properties of Base Metal and HAZ of 500 MPa Steel Plates for Offshore Platforms

Jiwon Park; Sung Kyu Cho; Young Wook Cho; Gunchul Shin; Yongjai Kwon; Jung Gu Lee; Sang Yong Shin

doi:10.3740/MRSK.2020.30.3.123

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2020 Vol.30, Issue 3 Preview Page Next Page

Correlation between Microstructure and Mechanical Properties of Base Metal and HAZ of 500 MPa Steel Plates for Offshore Platforms 해양플랜트용 500 MPa급 후판강의 모재 및 HAZ의 미세조직과 기계적 특성의 상관관계

March 2020. pp. 123-130

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Abstract

In this study, two types of thick steel plates are prepared by controlling carbon equivalent and nickel content, and their microstructures are analyzed. Tensile tests, Vickers hardness tests, and Charpy impact tests are conducted to investigate the correlation between microstructure and mechanical properties of the steels. The H steel, which has high carbon equivalent and nickel content, has lower volume fraction of granular bainite (GB) and smaller GB packet size than those of L steel, which has low carbon equivalent and nickel content. However, the volume fraction of secondary phases is higher in the H steel than in the L steel. As a result, the strength of the L steel is higher than that of the H steel, while the Charpy absorbed energy at -40 °C is higher than that of the L steel. The heat affected zone (HAZ) simulated H-H specimen has higher volume fraction of acicular ferrite (AF) and lower volume fraction of GB than the HAZ simulated L-H specimen. In addition, the grain size of AF and the packet sizes of GB and BF are smaller in the H-H specimen than in the L-H specimen. For this reason, the Charpy absorbed energy at -20 °C is higher for the H-H specimen than for the L-H specimen.

Keywords

steel

microstructure

tensile properties

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 : 30
No :3
Pages :123-130
Received Date : 2020-02-05
Revised Date : 2020-02-20
Accepted Date : 2020-02-20
DOI :https://doi.org/10.3740/MRSK.2020.30.3.123

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

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