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Study on Fracture Behavior of Mild Steel Under Cryogenic Condition
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 Title & Authors
Study on Fracture Behavior of Mild Steel Under Cryogenic Condition
Choi, Sung Woong; Lee, Woo IL;
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 Abstract
Considering for plants and structure under extreme conditions is required for the successful design, especially temperature and pressure. The ductile-brittle transition temperature (DBTT) for the materials under extreme condition needs to be considered. In this study, A-grade mild steel for the LNG carrier and offshore plant was examined by performing low-temperature Charpy V-notch (CVN) impact tests to investigate DBTT and the fracture toughness. The absorbed energy decreased gradually with the experimental temperature, which showed an upper-shelf energy region, lower shelf energy region, and transition temperature indicating DBTT. In addition, the fracture surface morphologies of the mild steels indicated ductile fractures at the upper-shelf energy level, with wide and large-sized dimples, whereas a brittle fracture surface, where was observed at the lower-shelf energy level, with both large and small cleavage facets. Based on the experimental results, ductile brittle transition temperature was estimated in about .
 Keywords
A-grade mild steel;CVN;DBTT;Ductile fracture;Brittle fracture;
 Language
Korean
 Cited by
 References
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