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- Title
Type IV Cracking Susceptibility in Weld Joints of Different Grades of Cr-Mo Ferritic Steel.
- Authors
Laha, K.; Chandravathi, K. S.; Parameswaran, P.; Sankara Rao, K. Bhanu
- Abstract
Relative type-IV cracking susceptibility in 2.25Cr-1Mo, 9Cr-1Mo, and 9Cr-1MoVNb ferritic steel weld joint has been assessed. The type-IV cracking was manifested as preferential accumulation of creep deformation and cavitation in the relatively soft intercritical region of heat affected zone of the weld joint. The type-IV cracking susceptibility has been defined as the reduction in creep-rupture strength of weld joint compared to its base metal. The 2.25Cr-1Mo steel exhibited more susceptibility to type-IV cracking at relatively lower temperatures; whereas, at higher temperatures, 9Cr-1MoVNb steel was more susceptible. The relative susceptibility to type-IV cracking in the weld joint of the Cr-Mo steels has been rationalized on the basis of creep-strengthening mechanisms operating in the steels and their venerability to change on intercritical heating during weld thermal cycle, subsequent postweld heat treatment, and creep exposure.
- Subjects
FERRITIC steel; STAINLESS steel; CAVITATION; HYDRODYNAMICS; TWO-phase flow; HEAT treatment of metals
- Publication
Metallurgical & Materials Transactions. Part A, 2009, Vol 40, Issue 2, p386
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-008-9724-x