Effect of elevated-temperature aging on creep-fatigue crack growth behavior of G115 steel

doi:10.13251/j.issn.0254-6051.2023.07.005

Abstract

Abstract: Creep-fatigue crack growth behavior of G115 steel aged at 650 ℃ for 1000, 2000 and 3000 h was investigated under the condition of holding time 600 s and initial stress intensity factor 23 MPa·m^0.5. The results reveal that the creep-fatigue crack growth rate da/dN increases with the aging time, causing the decrease of the crack propagation life. However, the change of aging time has no significant effect on crack propagation mechanism, which is a transgranular dominant mixed fracture mode with a large number of creep damage. The rapid nucleation and growth of Laves phase along the boundaries and the reduction of solid solution effect are the main reasons for the reduction of creep-fatigue crack growth life of G115 steel after aging.

Key words: G115 steel, elevated-temperature aging, creep-fatigue, crack growth

CLC Number:

TG142.1

Zhao Xin, Chen Zhengzong, Tang Zhengxin. Effect of elevated-temperature aging on creep-fatigue crack growth behavior of G115 steel[J]. Heat Treatment of Metals, 2023, 48(7): 26-31.

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