Summary
Extrapolating creep failure data to longer times has been extensively studied over the past six decades. In many industrial applications, high-temperature components are designed for service life’s much longer than those typically covered by experimental creep data. As a result, it becomes necessary to predict stress and temperature requirements for long-term service life based on much shorter-term data. While interpolation and correlation of creep-rupture data can be done with confidence within the temperature and stress ranges covered by experimental data, extrapolation to significantly longer rupture times often yields less accurate results, increasing the potential for error. [1]. There are several parametric methods for predicting the useful life of the components, such as the Larson-Miller, Manson-Haferd, Penny, Orr-Sherby-Dorn,
Read more Read lessManson-Brown, and Minimum-Commitment methods. [2].
The present study aims to evaluate the accuracy of remaining-life predictions for new 1Cr0.5Mo steel and for the same steel aged in service in samples from a part of the secondary superheater output collector of a boiler that had been in service for 240,000 hours in a thermoelectric plant, using the Larson-Miller [5] and Penny [3, 4] methods. The steel is a ferritic 1Cr-0.5Mo alloy, typically used in high-temperature applications. It was part of the secondary superheater output collector of a boiler that had been in service for 240,000 hours in a thermoelectric plant. This steel is identified by the manufacturer as 16CrMo44 according to the
German specification DIN 17337 [10]. During its operational life, the steel was exposed to a temperature of 500°C and a pressure of 80 kgf/cm².
Tests were conducted on both new and aged materials at temperatures of 500°C and 550°C, respectively, and stress ranges of 127 to 373 MPa, resulting in a total of 30 tests. The objective of this study was to assess whether there were significant differences in the residual life predictions made for the as-received 1Cr-0.5Mo steel and the same steel after it had aged in service.
Additional informations
| Publication type | Session Materials |
|---|---|
| Reference | D1_11396_2026 |
| Publication year | |
| Publisher | CIGRE |
| Country | Brazil |
| Study committees | |
| File size | 2 MB |
| Price for non member | 30 € |
| Price for member | 30 € |
Authors
FURTADO Heloisa C. - COPPE/UFRJ Brazil; ROZA Gabriela C. S. - COPPE/UFRJ Brazil; ALMEIDA Luiz H. - COPPE/UFRJ Brazil
Keywords
nuclear power plant, thermal power plant, creep test, integrity evaluation
