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Acta Metall Sin  2010, Vol. 46 Issue (4): 444-450    DOI: 10.3724/SP.J.1037.2009.00626
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FRACTURE CHARACTER OF LOW CYCLE FATIGUE OF P/M SUPERALLOY FGH97
ZHANG Ying; ZHANG Yiwen; ZHANG Na; LIU Mingdong; LIU Jiantao
Central Iron and Steel Research Institute; High Temperature Material Institute; Beijing 100081
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ZHANG Ying ZHANG Yiwen ZHANG Na LIU Mingdong LIU Jiantao. FRACTURE CHARACTER OF LOW CYCLE FATIGUE OF P/M SUPERALLOY FGH97. Acta Metall Sin, 2010, 46(4): 444-450.

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Abstract  

Powder metallurgy (P/M) nickel–based superalloy FGH97 has been researched in recent 10 years in China which is particularly suitable for producing aircraft engine disks and shafts etc.. In the range of operating temperature, the resistance to low cycle fatigue (LCF) of P/M nickel– based superalloy is one of the most important performances. In this paper the fracture features of LCF on P/M nickel–based superalloy FGH97 were investigated. The study focused on macroscopic and microscopic features of LCF fractures under 650 ℃, 980—30 MPa, 1 Hz test conditions by optical microscope and SEM. The types and morphologies of failure origins were observed. The effects of failure origin location and type, shape and size of defects located in fracture on LCF life were discussed. The results show that LCF life of all the specimens of FGH97 is over 5000 cyc under above test conditions. Statistically, 23% of LCF failure origins are on sample surface, 47% near surface and 30% in interior of samples. There are statistically three types of the LCF failure origins in this alloy: 5% of grain facet, 15% of powder particle and 80% of inclusion. Based on the statistical analysis and theoretical calculation of the influences of three types of LCF failure origins on LCF life, it can be concluded that the LCF life can be more severely affected by the inclusion than by the abnormal powder particle and partial plastic deformation.

Key words:  P/M superalloy FGH97      fracture of LCF      types of failure origin      LCF life     
Received:  18 September 2009     
Fund: 

Supported by National Basic Research Program of China (No.2010CB631200)

URL: 

https://www.ams.org.cn/EN/10.3724/SP.J.1037.2009.00626     OR     https://www.ams.org.cn/EN/Y2010/V46/I4/444

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