STUDY ON HIGH CYCLE FATIGUE PROPERTIES OF DZ468 SUPERALLOY

doi:10.3724/SP.J.1037.2009.00600

Acta Metall Sin

2010, Vol. 46

Issue (6): 708-714 DOI: 10.3724/SP.J.1037.2009.00600

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STUDY ON HIGH CYCLE FATIGUE PROPERTIES OF DZ468 SUPERALLOY

LIU Enze; ZHENG Zhi; TONG Jian; NING Likui; GUAN Xiurong

Institute of Metal Research; Chinese Academy of Sciences; Shenyang 110016

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LIU Enze ZHENG Zhi TONG Jian NING Likui GUAN Xiurong. STUDY ON HIGH CYCLE FATIGUE PROPERTIES OF DZ468 SUPERALLOY. Acta Metall Sin, 2010, 46(6): 708-714.

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Abstract

The high cycle fatigue properties of a new type Ni-based superalloy DZ468 were investigated in this paper. The high cycle fatigue strengths of DZ468 alloy at 900 and 760 ℃ with a ratio of stress R=-1 reach 290 and 300 MPa, respectively. The high cycle fatigue fractures of DZ468 alloy were composed of fatigue source, fatigue district and final stage. Cracks originate from surface, sub-surface and inner defect of sample. At 900 and 760 ℃, stage I and stage II crack propagation could be observed from fatigue fracture, which was caused by the combination action of planar slip, cross slip and climb of dislocations. With increasing of stress value, the crack propagation rate quickly increase. A correlation exists between the crack propagation mode and deformation mode.

Key words: Ni-based superalloy high cycle fatigue property fracture

Received: 10 September 2009

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https://www.ams.org.cn/EN/10.3724/SP.J.1037.2009.00600 OR https://www.ams.org.cn/EN/Y2010/V46/I6/708

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