In-situ observation of crack initiation and propagation in Ni-based superalloy with film cooling holes during tensile test

Zhenwei Li; Zhixun Wen; Shuning Gu; Haiqing Pei; Hangshan Gao; Qianzhu Mao

doi:10.1016/j.jallcom.2019.04.139

In-situ observation of crack initiation and propagation in Ni-based superalloy with film cooling holes during tensile test

Zhenwei Li, Zhixun Wen, Shuning Gu, Haiqing Pei, Hangshan Gao, Qianzhu Mao

School of Mechanics,Civil Engineering and Architecture

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

35 Scopus citations

Abstract

The main aim of this work is to explore and analyze the crack initiation and propagation in nickel-based superalloy with film cooling holes (FCHs) during the in-situ tensile test. The stress value and position of crack initiation were determined by experiments and finite element analysis (FEA). Internal cracking of the metallic carbides (MC) composed by refractory elements has a greater impact on crack initiation and propagation. Both crack initiation and early expansion are Mode-I. The secondary crack spread in the opening type; however, the main crack spread in the form of slip separation. The material microstructure in crack tip plastic zone has a decisive effect on the crack propagation path. Finally, samples break along the {111} slip plane and perpendicular to the stress axis direction in the form of cross-cleavage.

Original language	English
Pages (from-to)	65-76
Number of pages	12
Journal	Journal of Alloys and Compounds
Volume	793
DOIs	https://doi.org/10.1016/j.jallcom.2019.04.139
State	Published - 15 Jul 2019

Keywords

Cleavage fracture
Crack initiation
Crack propagation
In-situ tension
Metallic carbides

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10.1016/j.jallcom.2019.04.139

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title = "In-situ observation of crack initiation and propagation in Ni-based superalloy with film cooling holes during tensile test",

abstract = "The main aim of this work is to explore and analyze the crack initiation and propagation in nickel-based superalloy with film cooling holes (FCHs) during the in-situ tensile test. The stress value and position of crack initiation were determined by experiments and finite element analysis (FEA). Internal cracking of the metallic carbides (MC) composed by refractory elements has a greater impact on crack initiation and propagation. Both crack initiation and early expansion are Mode-I. The secondary crack spread in the opening type; however, the main crack spread in the form of slip separation. The material microstructure in crack tip plastic zone has a decisive effect on the crack propagation path. Finally, samples break along the {111} slip plane and perpendicular to the stress axis direction in the form of cross-cleavage.",

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AU - Li, Zhenwei

AU - Wen, Zhixun

AU - Gu, Shuning

AU - Pei, Haiqing

AU - Gao, Hangshan

AU - Mao, Qianzhu

PY - 2019/7/15

Y1 - 2019/7/15

N2 - The main aim of this work is to explore and analyze the crack initiation and propagation in nickel-based superalloy with film cooling holes (FCHs) during the in-situ tensile test. The stress value and position of crack initiation were determined by experiments and finite element analysis (FEA). Internal cracking of the metallic carbides (MC) composed by refractory elements has a greater impact on crack initiation and propagation. Both crack initiation and early expansion are Mode-I. The secondary crack spread in the opening type; however, the main crack spread in the form of slip separation. The material microstructure in crack tip plastic zone has a decisive effect on the crack propagation path. Finally, samples break along the {111} slip plane and perpendicular to the stress axis direction in the form of cross-cleavage.

AB - The main aim of this work is to explore and analyze the crack initiation and propagation in nickel-based superalloy with film cooling holes (FCHs) during the in-situ tensile test. The stress value and position of crack initiation were determined by experiments and finite element analysis (FEA). Internal cracking of the metallic carbides (MC) composed by refractory elements has a greater impact on crack initiation and propagation. Both crack initiation and early expansion are Mode-I. The secondary crack spread in the opening type; however, the main crack spread in the form of slip separation. The material microstructure in crack tip plastic zone has a decisive effect on the crack propagation path. Finally, samples break along the {111} slip plane and perpendicular to the stress axis direction in the form of cross-cleavage.

KW - Cleavage fracture

KW - Crack initiation

KW - Crack propagation

KW - In-situ tension

KW - Metallic carbides

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VL - 793

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JO - Journal of Alloys and Compounds

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ER -

In-situ observation of crack initiation and propagation in Ni-based superalloy with film cooling holes during tensile test

Abstract

Keywords

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