Title

Creep-Fatigue Interaction and Cyclic Strain Analysis in P92 Steel Based on Test

Document Type

Article

Publisher

Springer New York LLC

School

School of Engineering

RAS ID

19137

Funders

NSFC, National Natural Science Foundation of China

Grant Number

51201097

Comments

Originally published as: Ji, D., Zhang, L.-C., Ren, J., Wang, D. (2015). Creep-Fatigue Interaction and Cyclic Strain Analysis in P92 Steel Based on Test in Journal of Materials Engineering and Performance, 24(4), 1441-1451. Available here.

Abstract

This work focused on the interaction of creep and fatigue and cyclic strain analysis in high-chromium ferritic P92 steel based on load-controlled creep-fatigue (CF) tests and conventional creep test at 873 K. Mechanical testing shows that the cyclic load inhibits the propagation of creep damage in the P92 steel and CF interaction becomes more severe with the decrease in the holding period duration and stress ratio. These results are also verified by the analysis of cyclic strain. The fatigue lifetime reduces with the increasing of the holding period duration and it does not reduce much with the increasing stress ratio especially under the conditions of long holding period duration. The cyclic strains (i.e., the strain range and creep strain) of CF tests consist of three stages, which is the same as those for the conventional creep behavior. The microscopic fracture surface observations illustrated that two different kinds of voids are observed at the fracture surfaces and Laves phase precipitates at the bottom of the voids.

DOI

10.1007/s11665-015-1446-9