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Acta Metall Sin  2009, Vol. 45 Issue (3): 320-325    DOI:
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EFFECT OF HEAT TREATMENT ON FATIGUE BEHAVIOR OF 25Cr2NiMo1V STEEL
ZHU Mingliang; XUAN Fuzhen; ZHU Kuilong; WANG Guozhen; JIA Tianyao
School of Mechanical and Power Engineering; East China University of Science and Technology; Shanghai 200237
Cite this article: 

ZHU Mingliang XUAN Fuzhen ZHU Kuilong WANG Guozhen JIA Tianyao. EFFECT OF HEAT TREATMENT ON FATIGUE BEHAVIOR OF 25Cr2NiMo1V STEEL. Acta Metall Sin, 2009, 45(3): 320-325.

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Abstract  

The specimens of commercial 25Cr2NiMo1V steel were treated at 955 ℃ quenching +665 ℃ tempering (HP) and 900 ℃ quenching +625 ℃ tempering (LP), respectively. Fatigue threshold and fatigue crack propagation rate tests were conducted in HP and LP specimens. The results show that in threshold regime, the HP specimen has larger fatigue threshold and lower fatigue crack growth rates than the LP specimen. The fatigue behavior is related to crack closure and the surface roughness is a main factor for crack closure. HP specimen has a larger crack closure ability than LP specimen due to the densified bainites and larger prior austenite grain size. HP specimen has more tempering martensites which do not play an important role in preventing crack growth. In Paris regime, no clear difference between fatigue behaviors of HP and LP specimens is observed.

Key words:  25Cr2NiMo1V steel      combined rotor      fatigue threshold      crack growth rate      crack closure     
Received:  15 October 2008     
ZTFLH: 

TG142.11

 
  TG111.91

 
Fund: 

Supported by National High Technology Research and Development Program of China (No.2006AA04Z413) and Program for New Century Excellent Talents in University (No.NCET--06--0414)

URL: 

https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y2009/V45/I3/320

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