Effect of microstructure on formation of ductile fracture surface in steel plate

Tomoaki Fukahori, Shinichi Suzuki, Naoya Yamada, Masatoshi Aramaki, Osamu Furukimi

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

1 被引用数 (Scopus)

抄録

In recent years, high strength steel plates for building and pipelines have been required to improve ductile fracture properties, assuming ground deformation in earthquake-prone region. The ductile fracture is performed by the result from coalescence of micro-voids followed by the nucleation and growth[1]. Fractured surface morphology reflects the void coalescence process, so it is important to consider the relationship between the fracture surface morphology and the micro-voids formation beneath the fractured surface to consider the ductile fracture properties. The voids nucleate sites are mainly particles such as inclusions or precipitates, and grain boundries. These voids grow and coalesce according to three modes. The first mode is directly coalescence of voids followed by growth[2]. The second one is the coalescence of voids caused by shear deformation followed by internal necking between voids[3]. The third one is the coalescence of voids caused by micro-voids nucleation in shear band between two larger voids[4]. It is expected that these modes influence local elongation property which is one of the indices for ductile fracture property through the formation of fractured surface. In this study, local deformation energy which is measured by load-displacement curve in tensile test is examined by focusing the voids nucleation, growth and coalescence, for high tensile strength plates of TS480-830MPa which is controlled by the microstructure through the cooling rate of heat treatment. The deformation energy is useful to consider the ductile fracture property of steel plates which have a different tensile strength.

本文言語英語
ホスト出版物のタイトルTHERMEC 2011 Supplement
ページ678-683
ページ数6
DOI
出版ステータス出版済み - 2012
イベント7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011 - Quebec City, QC, カナダ
継続期間: 8 1 20118 5 2011

出版物シリーズ

名前Advanced Materials Research
409
ISSN(印刷版)1022-6680

その他

その他7th International Conference on Processing and Manufacturing of Advanced Materials, THERMEC'2011
Countryカナダ
CityQuebec City, QC
Period8/1/118/5/11

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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