EFFECT OFδ-Ni_3 Nb ON LOW CYCLE FATIGUE RACTURE OF INCONEL 718

Acta Metall Sin

1991, Vol. 27

Issue (1): 55-60 DOI:

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EFFECT OFδ-Ni_3 Nb ON LOW CYCLE FATIGUE RACTURE OF INCONEL 718

HONG Bande;YI Xiao;MENG Qingchang Harbin Institute of Technology

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HONG Bande;YI Xiao;MENG Qingchang Harbin Institute of Technology. EFFECT OFδ-Ni_3 Nb ON LOW CYCLE FATIGUE RACTURE OF INCONEL 718. Acta Metall Sin, 1991, 27(1): 55-60.

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Abstract The effect of size and distribution of σ-Ni_3Nb phase on the fatiguefracture behaviour of Inconel 718 under constant controlled cyclic strain at 650℃has been studied. The serrated distribution or σ-plates along grain boundaries, form-ed by high temperature solid solution and intermediate aging, may improve the re-sistance to crack propagation along boundary, so as to change the low cycle fatiguefracture from intergranular, undergone standard heat treatment, into transgranular.However, the precipitation of coarse plate σ-phase along twin boundaries and throughgrains, after treated on the schedule for forming the serrated boundary, mayreduce the adoptability to cyclic strain and may often form too early the microvo-ids at interface between σ-phase and matrix and even disintegrate to shorten the fa-tigue life of steel.

Key words: δ-Ni_3Nb phase fatigue life intergranular fracture transgranular fracture

Received: 18 January 1991

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