Dependence of Accelerated Creep Rate at 580 °C and Room Temperature Yield Stress for Two Creep Resistant Steels

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 determ...

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Bibliographic Details
Published in:Steel research international 2010-07, Vol.81 (7), p.576-580
Main Authors: Vodopivec, F., Vojvodič-Tuma, J., Jenko, M., Celin, R., Šuštaršič, B.
Format: Article
Language:English
Subjects:
accelerated creep rate
carbide precipitates
Creep resistant steel
tempered martensite
yield stress
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Summary: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.
ISSN:1611-3683
1869-344X
DOI:10.1002/srin.201000046