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Microstructural evaluation and creep deformation and rupture behavior of 9Cr-1Mo steel base metal, weld metal and weld joint

Laha, K and Chandravathi, KS and Rao, KBS and Mannan, SL and Sastry, DH (2000) Microstructural evaluation and creep deformation and rupture behavior of 9Cr-1Mo steel base metal, weld metal and weld joint. In: Workshop on Creep, Fatigue and Creep-Fatigue Interaction, JAN 20-22, 1999, Indira Gandhi Centre Atomic Research, Kalpakkam, India, pp. 217-221.

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Abstract

The deformation and creep rupture behaviour of 9Cr-1Mo ferritic steel base metal, weld metal and cross weld joint at 823 K over a stress range of 130-250 MPa have been evaluated. The weld metal exhibited significantly higher creep rupture life than the base metal and the weld joint showed inferior creep rupture life. The weld joint crept at a faster rate while the weld metal deformed at a slower rate than the base metal. Transgranular fracture prevailed over the stress range examined. Microstructure developed across the weld joint and the changes of the microstructures that occurred during creep test have been characterized. Failure in the weld joint specimens took place in the intercritical structure of heat affected zone. Intergranular creep damage comprising cavities and cracks were not seen in the tested samples. Ductility was marginally reduced with increasing rupture time for all the material conditions. The rupture elongation exhibited by base metal was higher than that shown by weld metal and weld joint

Item Type: Conference Paper
Additional Information: Copyright of this article belongs to Indian Institute of Metals.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 02 Nov 2009 11:46
Last Modified: 16 Feb 2010 05:05
URI: http://eprints.iisc.ernet.in/id/eprint/18041

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