Difficulties in interpreting data from creep crack growth tests on type 316H weldments

Autor:	D. W. Dean, L. Allport
Rok vydání:	2013
Předmět:	Heat-affected zone Materials science Tension (physics) Mechanical Engineering Butt welding Metallurgy Condensed Matter Physics Crack growth resistance curve Crack closure Cracking Creep Mechanics of Materials Residual stress General Materials Science
Zdroj:	Materials Research Innovations. 17:344-349
ISSN:	1433-075X 1432-8917
DOI:	10.1179/1432891713z.000000000254
Popis:	Experimental creep crack growth data are generally obtained by following standard methods such as ASTM E1457-07 and subsequently characterised using the C* parameter. These data are then used in assessment procedures, such as R5, together with reference stress estimates of C* in the component, to predict creep crack growth behaviour. Some modifications to the ASTM E1457 creep crack growth testing and analysis methods have already been proposed following a previous analysis of data from long term creep crack growth tests on type 316H parent material. This paper reports the results of creep crack growth tests on type 316H heat affected zone material at 550°C using compact tension (CT) specimens manufactured from non-stress relieved thick section butt welds. It is shown that interpretation of the data from these weldment tests is complicated by both the discontinuous nature of the cracking process and the presence of significant residual stresses in the CT specimens. Further modifications to creep cr...
Databáze:	OpenAIRE
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