Journal Published Online: 23 September 2019
Volume 8, Issue 1

Results of the ASTM Round Robin on Creep-Fatigue Crack Growth Testing of a P91 Steel



This article summarizes the results of a round robin (RR) study begun in 2013 to evaluate ASTM E2760-10, Standard Method for Creep-Fatigue Crack Growth Testing (Superseded). Thirteen laboratories from around the world conducted testing and reported results. The test material was a creep-ductile, ASTM Grade P91 9Cr-1Mo steel. All testing was performed using nominally 50-mm-wide compact tension specimens at a test temperature of 625°C using trapezoidal waveforms with hold times of 0, 60, and 600 s. The 600-s hold time condition was the primary condition used for assessing interlaboratory variability among crack growth rates. Loading/unloading times were 2 s each. All laboratories tested duplicate specimens that were identical in all respects except for the force amplitude levels. Results from prior studies that included tensile, creep deformation and rupture, and low-cycle fatigue properties were available for the analysis of tests conducted as part of this RR testing. Crack growth rates at 600-s hold time reported by six laboratories fall within a 95 % confidence band (interlaboratory variability) separated by a factor of 6.16 when correlated with ΔK, 10.76 when correlated with measured vales of (Ct)avg, and 7.17 when correlated with calculated values of (Ct)avg.

Author Information

Narasimhachary, Santosh B.
Siemens Corporate Technology, Charlotte, NC, USA
Saxena, Ashok
Department of Mechanical Engineering, College of Engineering, University of Arkansas, Fayetteville, AR, USA
Pages: 20
Price: $25.00
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Stock #: MPC20190125
ISSN: 2379-1365
DOI: 10.1520/MPC20190125