High-temperature tensile and creep deformation of cross-weld specimens of weld joint between T92 martensitic and Super304H austenitic steels

Title
High-temperature tensile and creep deformation of cross-weld specimens of weld joint between T92 martensitic and Super304H austenitic steels
Authors
김명연곽석출최인석이영국서진유Eric Fleury정우상손태하
Keywords
Heat-resistant steel; Welding; Heat-affected zone; Hardness measurement; Laves phase; Electron microscopy
Issue Date
2014-11
Publisher
Materials characterization
Citation
VOL 97, 161-168
Abstract
The high-temperature mechanical behavior of cross-weld specimens prepared from a dissimilar weld joint between T92 martensitic and Super304H austenitic heat-resistant steels incorporating Ni-based weld metal was evaluated at temperatures up to 650 °C. For both high temperature tensile and creep tests, failure took place in T92 due to its faster degradation with temperature increase. The heat-affected zone of T92 played a critical role during creep deformation, resulting in type IV failure under the long-term creep condition. For the creep specimens, the location of failure shifted from the base metal region to the fine-grained heat-affected zone as the creep duration time increased from the short-term to the long-term condition. The massive precipitation of Laves phase on the grain boundaries of the fine-grained heat-affected zone during creep deformation was observed and found to be responsible for the accelerated void formation in the area leading to the premature failure.
URI
http://pubs.kist.re.kr/handle/201004/48302
ISSN
10445803
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KIST Publication > Article
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