High-temperature creep properties of fine grained heat-affected zone in P92 weldment

The simulated fine grained heat-affected zone (FGHAZ) specimens for P92 welded joints were prepared by heat treatment, then the creep tests were carried out at 650 °C under the applied stress of 90–120 MPa to investigate high-temperature creep behavior of FGHAZ. The results show that the creep prope...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2009-12, Vol.19, p.s772-s775
Main Authors: WANG, Xue, SHI, Zhuan, PAN, Qian-gang, WU, Hong-liang
Format: Article
Language:English
Subjects:
Chromium molybdenum vanadium steels
creep
Creep (materials)
Creep rate
Creep tests
fine grained heat-affected zone(FGHAZ)
Heat affected zone
Heat resistant steels
Heat treatment
High strength steels
Mathematical analysis
resistant heat steel
Stresses
welding
Weldments
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Summary:The simulated fine grained heat-affected zone (FGHAZ) specimens for P92 welded joints were prepared by heat treatment, then the creep tests were carried out at 650 °C under the applied stress of 90–120 MPa to investigate high-temperature creep behavior of FGHAZ. The results show that the creep property of FGHAZ is much inferior to that of the base metal, which exhibits the much higher steady creep rate and shorter time to creep fracture. The power law equation can describe the steady creep rate dependence on applied stress, indicating that the stress exponent n of FGHAZ is distinguished between two regions with n=15.1 at high stresses (more than 100 MPa) and n=8.64 at lower stresses. Based on Monkman-Grant equation, the relationship between the secondary creep rate and time to rupture is obtained to evaluate the creep life of FGHAZ with the applied stress above 100 MPa.
ISSN:1003-6326
DOI:10.1016/S1003-6326(10)60149-5