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Isochronous creep curves for a low alloy steel

Comandar C., Amariei N., Leon D.

International Journal of Applied Mechanics and Engineering

2003

Vol. 8, no spec.

225-229

The paper presents the authors' research of the low alloy steel behaviour at high temperature. The short time testing and creep testing results are presented. Processing of the creep experimental results, a family of isochronous creep curves is obtained. Having constructed these curves, it is possible to predict the stress relaxation response. The relaxation response is determined with equation of stress relaxation curves by Kachanov's flow hypothesis and Belyaev-Malinin's hypothesis.

Life prediction for alloy steel pipeline under creep conditions

Comandar C., Amariei N., Leon D.

Applied Mechanics and Engineering

1999

Vol. 4, no spec.

75-78

This paper presents the research of the authors did to determine the current state of two steam pipe-lines after 100 000 hours in function at 500°C and 10MPa. Chemical and metallographic analyses, mechanical tests and creep failure tests have been performed. The results of the creep tests were extrapolated by means of Larson-Miller method. The paper presents graphics of results obtained. The behaviour of the studied materials is interpreted from the residual life assessment.