2012年8月
Evaluation of local deformation behavior accompanying fatigue damage in F82H welded joint specimens by using digital image correlation
FUSION ENGINEERING AND DESIGN
- ,
- 巻
- 87
- 号
- 5-6
- 開始ページ
- 589
- 終了ページ
- 593
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1016/j.fusengdes.2012.01.048
- 出版者・発行元
- ELSEVIER SCIENCE SA
By using digital image correlation, the deformation behaviors of local domains of F82H joint specimens welded using tungsten inert gas (TIG) and electron beam (EB) welding were evaluated during tensile and fatigue testing. In the tensile test specimens, the tensile strength decreased in the TIG-welded joints, and ductility decreased in both the EB- and TIG-welded joints. Because axial strain increased in the tempered heat-affected zone (HAZ) and led to the fracture of the TIG-welded joint, the strength was considered to have decreased because of welding. In fatigue testing, the number of cycles to fracture for the welded joint decreased to less than 40-60% of that for the base metal. For both fracture specimens, the largest value of shear strain was observed in the region approximately between the fine-grained HAZ and tempered HAZ; this shear strain ultimately led to fracture. Cavities and macrocracks were observed in the fine-grained HAZ and tempered HAZ in the cross sections of the fracture specimens, and geometrical damage possibly resulted in the reduction of fatigue lifetime. (C) 2012 Elsevier B.V. All rights reserved.
- リンク情報
- ID情報
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- DOI : 10.1016/j.fusengdes.2012.01.048
- ISSN : 0920-3796
- Web of Science ID : WOS:000309781400041