Creep rupture analysis and remaining life assessment of 2.25Cr-1Mo steel tubes from a thermal power plant

被引：49
作者：
Ray, A. K. [1 ]
Tiwari, Y. N.
Roy, P. K.
Chaudhuri, S.
Bose, S. C.
Ghosh, R. N.
Whittenberger, J. D.
机构：
[1] Natl Met Lab, Jamshepur 831007, India
[2] NASA, Lewis Res Ctr, Cleveland, OH 44135 USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2007年 / 454卷
关键词：
service exposed; 2.25Cr-1Mo steel; Larson-Miller parameter; LMP residual life;
D O I：
10.1016/j.msea.2006.11.019
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Superheater and reheater 2.25Cr-1Mo steel boiler tubes from a thermal power plant after 17 year of service at nominally 540 degrees C and 40 MPa were studied to predict their remnant life. The investigation included dimensional, hardness and tensile measurements in addition to accelerated stress rupture tests between 625 and 700 degrees C and microstructural examination. The microstructure of the service-exposed alloy was free from any signs of deterioration, and the hardness was within the expected ranges; however, tensile testing revealed an apparent loss of strength from room temperature to 600 degrees C. Accelerated rupture testing, on the other hand, did not reveal any degradation of rupture behaviour compared to that of the virgin alloy. Analysis of the stress rupture data predicted that the 17 years exposed superheater and reheater tubes could remain in continued service for at least 12 more years at the current stress-temperature conditions. (c) 2006 Elsevier B.V. All rights reserved.
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页码：679 / 684
页数：6
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