Dependence of Accelerated Creep Rate at 580 °C and Room Temperature Yield Stress for Two Creep Resistant Steels |
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Authors: | F Vodopivec J Vojvodič‐Tuma M Jenko R Celin B Šuštaršič |
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Affiliation: | Institute of Metals and Technology, Lepi pot 11, Ljubljana, Slovenia |
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Abstract: | Two creep resistant steels, P91 and X20, were tempered for 17520 h at 650 °C or 8760 h at 750 °C to study the growth and redistribution of carbide precipitates in martensite. On specimens annealed for a different time, yield stress at room temperature and accelerated creep rate at 580 °C were determined. With increasing yield stress in the range from 350 to 650 MPa the accelerated creep rate decreased continuously by about 2 orders of magnitude from 8·10?7 s?1 to 5·10?9 s?1. For equal yield stress, the creep rate was slightly lower for the steel P91 than for the steel X20. |
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Keywords: | Creep resistant steel tempered martensite carbide precipitates yield stress accelerated creep rate |
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