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A new approach to creep data assessment

โœ Scribed by B. Wilshire; P.J. Scharning; R. Hurst

Publisher
Elsevier Science
Year
2009
Tongue
English
Weight
202 KB
Volume
510-511
Category
Article
ISSN
0921-5093

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โœฆ Synopsis

New relationships, incorporating the activation energy for matrix diffusion (300 kJ mol -1 ) and the ultimate tensile strength values at the creep temperature, allow effective rationalization of the multi-batch stress rupture properties for Grade 92 steel (9Cr-0.5Mo-1.8W-V-Nb). These approaches lead to straightforward procedures for extrapolation of short-term results, with creep life measurements from tests lasting up to only 5000 h providing reasonable estimates of 100,000 h rupture strengths. Validation of this new methodology would therefore offer the prospect of cost-effective acquisition of long-term creep design data.

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