Creep-fatigue interaction behavior of simulated microstructures and the actual weldment of P91 steel

被引：12
作者：
Mariappan, K. [1 ]
Nagesha, A. [1 ]
机构：
[1] Indira Gandhi Ctr Atom Res, Mech Met Div, Kalpakkam 603102, Tamil Nadu, India
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2023年 / 866卷
关键词：
P91; steel; Simulated HAZ; Microstructure; Creep -fatigue interaction; Fatigue life; MODIFIED 9CR-1MO STEEL; LOW-CYCLE FATIGUE; HEAT-AFFECTED ZONE; LONG-TERM CREEP; MECHANICAL-PROPERTIES; TENSILE PROPERTIES; EVOLUTION; LIFE; OXIDATION; JOINT;
D O I：
10.1016/j.msea.2023.144695
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The paper presents first of its kind study on the creep-fatigue interaction (CFI) behavior of simulated coarse grain (CG), fine grain (FG) and inter-critical (IC) heat-affected zones (HAZs) of P91 steel weldment. Total axial straincontrolled fatigue tests were conducted at 550 C using trapezoidal waveform and introducing 30-min hold at peak tensile strain of +/- 0.6%. Irrespective of the initial microstructure, the alloy exhibited continuous cyclic softening throughout the deformation under CFI condition. Strain localization together with interlinkage of subsurface creep cavities caused enhanced crack propagation that resulted in the lowest fatigue life in the case of ICHAZ. The actual weldment failed in the interface between FGHAZ and ICHAZ. The mode of failure was found to be largely governed by Type IV cracking.
引用
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页数：17
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