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

被引：32

作者：

Li, Zhenwei ^{[1
]}

Wen, Zhixun ^{[1
]}

Gu, Shuning ^{[1
]}

Pei, Haiqing ^{[1
]}

Gao, Hangshan ^{[1
]}

Mao, Qianzhu ^{[1
]}

机构：

[1] Northwestern Polytech Univ, Sch Mech Civil Engn & Architecture, Xian 710072, Shaanxi, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 793卷

关键词：

In-situ tension; Crack initiation; Metallic carbides; Crack propagation; Cleavage fracture; SINGLE-CRYSTAL SUPERALLOY; STRESS-STRAIN BEHAVIOR; LOW-CYCLE FATIGUE; MECHANICAL-PROPERTIES; GROWTH-BEHAVIOR; DAMAGE; MICROSTRUCTURE; PLATES; SEM;

D O I：

10.1016/j.jallcom.2019.04.139

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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. (C) 2019 Elsevier B.V. All rights reserved.

引用

页码：65 / 76

页数：12

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