COMBINED CREEP-FATIGUE BEHAVIOUR OF A 12Cr1MoV STEEL USED IN POWER PLANTS
WANG Xiang;TONG Shihua;JIANG Xianmei;REN Weiping Institute of Solid State Physics; Academia Sinica; Hefei Shanghai Power Equipment Research InstituteKONG Qingping Professor;Institute of Solid State Physics;Academia Sinica;Hefei
Cite this article:
WANG Xiang;TONG Shihua;JIANG Xianmei;REN Weiping Institute of Solid State Physics; Academia Sinica; Hefei Shanghai Power Equipment Research InstituteKONG Qingping Professor;Institute of Solid State Physics;Academia Sinica;Hefei. COMBINED CREEP-FATIGUE BEHAVIOUR OF A 12Cr1MoV STEEL USED IN POWER PLANTS. Acta Metall Sin, 1988, 24(2): 106-110.
Abstract Combined creep-fatigue behaviour (i. e. cyclic creep) of a 12Cr1MoVsteel used in power plants has been studied at 550℃. Experimental resultsindicated that, at higher stress amplitude, the rupture life of cyclic creep is longerthan that of pure creep, and the rupture is mainly transgranular. At lower stressamplitude, the rupture life of cyclic creep is shorter than that of pure creep, andthe rupture is intergranular. Based on TEM observations of dislocation structuresand grain boundaries in ruptured specimens, the reason of cyclic strengthening andcyclic weakening at different stress amplitudes is considered to be: at higher stress,the damage in the interior of grains can be partly recovered during unloading inthe case of cyclic stress; while at lower stress, superposition of cyclic stress enhances the cavity formation and linkage at grain boundaries.
