Volume 46, Issue 10 pp. 3829-3845
ORIGINAL ARTICLE

The low cycle fatigue property, damage mechanism, and life prediction of additively manufactured Inconel 625: Influence of temperature

Meng Liu

Meng Liu

Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University, Chengdu, China

Key Laboratory of Deep Underground Science and Engineering, Ministry of Education, Sichuan University, Chengdu, China

State Key Laboratory of Long-Life High Temperature Materials, Dongfang Turbine Co., Ltd, Deyang, China

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Yifang Cai

Yifang Cai

Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University, Chengdu, China

Key Laboratory of Deep Underground Science and Engineering, Ministry of Education, Sichuan University, Chengdu, China

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Quanyi Wang

Quanyi Wang

Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University, Chengdu, China

Key Laboratory of Deep Underground Science and Engineering, Ministry of Education, Sichuan University, Chengdu, China

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Yunqing Jiang

Yunqing Jiang

Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University, Chengdu, China

Key Laboratory of Deep Underground Science and Engineering, Ministry of Education, Sichuan University, Chengdu, China

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Tongfei Zou

Tongfei Zou

Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University, Chengdu, China

Key Laboratory of Deep Underground Science and Engineering, Ministry of Education, Sichuan University, Chengdu, China

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Yunru Wang

Yunru Wang

Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University, Chengdu, China

Key Laboratory of Deep Underground Science and Engineering, Ministry of Education, Sichuan University, Chengdu, China

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Qingsong Li

Qingsong Li

State Key Laboratory of Long-Life High Temperature Materials, Dongfang Turbine Co., Ltd, Deyang, China

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Yubing Pei

Yubing Pei

State Key Laboratory of Long-Life High Temperature Materials, Dongfang Turbine Co., Ltd, Deyang, China

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Hong Zhang

Corresponding Author

Hong Zhang

Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University, Chengdu, China

Key Laboratory of Deep Underground Science and Engineering, Ministry of Education, Sichuan University, Chengdu, China

State Key Laboratory of Long-Life High Temperature Materials, Dongfang Turbine Co., Ltd, Deyang, China

Correspondence

Hong Zhang and Yonjie Liu, Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University, Chengdu, 610065, China.

Email: [email protected] and [email protected]

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Yongjie Liu

Corresponding Author

Yongjie Liu

Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University, Chengdu, China

Key Laboratory of Deep Underground Science and Engineering, Ministry of Education, Sichuan University, Chengdu, China

Correspondence

Hong Zhang and Yonjie Liu, Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University, Chengdu, 610065, China.

Email: [email protected] and [email protected]

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Qingyuan Wang

Qingyuan Wang

Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University, Chengdu, China

Key Laboratory of Deep Underground Science and Engineering, Ministry of Education, Sichuan University, Chengdu, China

School of Architecture and Civil Engineering, Chengdu University, Chengdu, China

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First published: 25 July 2023

Abstract

Symmetrical high-temperature low-cycle fatigue tests were performed in this study to examine the influence of temperature on the fatigue failure mechanism of the additively manufactured Inconel 625. According to the fracture analysis, cracks initiate from the crystallographic plane at room temperature. At 600°C, oxidation of carbides leads to crack initiation. The strengthening effect of γ″ precipitation prevents crack propagating within the matrix. At 750°C, the crack becomes transgranular propagating, as a consequence of γ″-δ transformation. Geometrically necessary dislocations distribution on the fracture supports this result. Furthermore, a modified life prediction formula considering effect of temperature and strain amplitude was established. It was observed that the modified model predicted the fatigue life of the studied materials well in both test conditions.

Highlights

  • Cracks initiate from favorable slip plane at room temperature.
  • Precipitation of γ″ at 650°C prevents dislocation shearing into the matrix.
  • Cyclic plastic deformation accelerates the γ″-δ transformation at 700°C.
  • Life prediction model considering strain amplitude and temperature shows good accuracy.

DATA AVAILABILITY STATEMENT

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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