Very High Cycle Fatigue Behavior of a Directionally Solidified Ni-Base Superalloy DZ4
AbstractThe effect of casting pores on the very high cycle fatigue (VHCF) behavior of a directionally solidified (DS) Ni-base superalloy DZ4 is investigated. Casting and hot isostatic pressing (HIP) specimens were subjected to very high cycle fatigue loading in an ambient atmosphere. The results demonstrated that the continuously descending S-N curves were exhibited for both the casting and HIP specimens. Due to the elimination of the casting pores, the HIP samples had better fatigue properties than the casting samples. The subsurface crack initiated from the casting pore in the casting specimens at low stress amplitudes, whereas fatigue crack initiated from crystallographic facet decohesion for the HIP specimens. When considering the casting pores as initial cracks, there exists a critical stress intensity threshold ranged from 1.1 to 1.3
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Nie, B.; Zhao, Z.; Liu, S.; Chen, D.; Ouyang, Y.; Hu, Z.; Fan, T.; Sun, H. Very High Cycle Fatigue Behavior of a Directionally Solidified Ni-Base Superalloy DZ4. Materials 2018, 11, 98.
Nie B, Zhao Z, Liu S, Chen D, Ouyang Y, Hu Z, Fan T, Sun H. Very High Cycle Fatigue Behavior of a Directionally Solidified Ni-Base Superalloy DZ4. Materials. 2018; 11(1):98.Chicago/Turabian Style
Nie, Baohua; Zhao, Zihua; Liu, Shu; Chen, Dongchu; Ouyang, Yongzhong; Hu, Zhudong; Fan, Touwen; Sun, Haibo. 2018. "Very High Cycle Fatigue Behavior of a Directionally Solidified Ni-Base Superalloy DZ4." Materials 11, no. 1: 98.
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