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Title: Creep rupture behavior due to molybdenum rich M{sub 6}C carbide in 1.0Cr-1.0Mo-0.25V bainitic steel weldment

Some reports show that Cr-Mo-V steel structures fabricated by welding has a high percent of failures in the microstructurally altered and inhomogeneous heat affected zone (HAZ). The failure usually takes place either at the coarse grain HAZ (CGHAZ) or intercritical HAZ (ICHAZ). Failure at creep condition is related to either cracking at grain boundary triple junctions or the formation of cavities (or voids) on grain boundaries that are approximately normal to the applied stress. Cavities are normally formed by grain boundary sliding causing stress concentrations at precipitates in the grain boundaries. Cavities will then develop at the precipitates whenever plastic flow or diffusion is not fast enough to prevent it. The precipitates that provide cavity nucleation sites are mostly sulfides and carbides. The carbides that provide cavity sites are usually M{sub 23}C{sub 6} and M{sub 6}C. Although considerable researchers have been carried out in the carbides that provide cavitation, the mechanism governs creep behavior during welding remains uncertain. Therefore, the objective of this study is to correlate carbide morphology and its effect on creep rupture behavior in 1.0 Cr-1.0Mo-0.25V bainitic steel weldment.
Authors:
 [1] ;  [2] ;  [3]
  1. Kia Motors Corp., Kyungkido (Korea, Republic of)
  2. SoonChunHayng Univ., ChungNam (Korea, Republic of). Dept. of Materials Engineering
  3. Univ. of Illinois, Chicago, IL (United States)
Publication Date:
OSTI Identifier:
684346
Resource Type:
Journal Article
Resource Relation:
Journal Name: Scripta Materialia; Journal Volume: 41; Journal Issue: 1; Other Information: PBD: 4 Jun 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CREEP; FRACTURE PROPERTIES; STEEL-CRMOV; WELDED JOINTS; CARBIDES; PRECIPITATION; CORRELATIONS