On the creep fracture toughness of 21/4Cr1Mo steel

Fu Zhen Xuan; Shan Ng Tu; Zheng Dong Wang; Jian Ming Gong

doi:10.4028/0-87849-978-4.1464

On the creep fracture toughness of 21/4Cr1Mo steel

Fu Zhen Xuan, Shan Ng Tu, Zheng Dong Wang, Jian Ming Gong

School of Mechanical and Power Engineering

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

8 Scopus citations

Abstract

To assess the failure risk of high temperature structures, it is essential to obtain the creep fracture toughness of materials. In the present paper, Creep crack growth (CCG) tests for 21/4Cr1Mo steel have been carried out by utilizing the side grooved compact tension (CT) specimen and direct current (DC) electrical potential technique. The material parameter of creep fracture toughness, K_mat^c, were obtained from analysis of 11 CCG tests at temperatures of 500 and 565°C. It has been found that for 21/4Cr1Mo steel K_mat^c decreases with increasing time and increases with elevating temperature. For this reason, the value of K_mat ^c at lower temperature or longer service time can be used to extract a conservative result in the high temperature defect assessment where the accurate value of K_mat^c is unavailable. It is also validated from this test that the proposed formula by Ainsworth et al can be adopted in practice.

Original language	English
Pages (from-to)	1464-1469
Number of pages	6
Journal	Key Engineering Materials
Volume	297-300 III
DOIs	https://doi.org/10.4028/0-87849-978-4.1464
State	Published - 2005

Keywords

21/4Cr1Mo steel
Creep crack growth test
Creep fracture toughness
High temperature

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10.4028/0-87849-978-4.1464

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abstract = "To assess the failure risk of high temperature structures, it is essential to obtain the creep fracture toughness of materials. In the present paper, Creep crack growth (CCG) tests for 21/4Cr1Mo steel have been carried out by utilizing the side grooved compact tension (CT) specimen and direct current (DC) electrical potential technique. The material parameter of creep fracture toughness, Kmatc, were obtained from analysis of 11 CCG tests at temperatures of 500 and 565°C. It has been found that for 21/4Cr1Mo steel Kmatc decreases with increasing time and increases with elevating temperature. For this reason, the value of Kmat c at lower temperature or longer service time can be used to extract a conservative result in the high temperature defect assessment where the accurate value of Kmatc is unavailable. It is also validated from this test that the proposed formula by Ainsworth et al can be adopted in practice.",

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AU - Xuan, Fu Zhen

AU - Tu, Shan Ng

AU - Wang, Zheng Dong

AU - Gong, Jian Ming

PY - 2005

Y1 - 2005

N2 - To assess the failure risk of high temperature structures, it is essential to obtain the creep fracture toughness of materials. In the present paper, Creep crack growth (CCG) tests for 21/4Cr1Mo steel have been carried out by utilizing the side grooved compact tension (CT) specimen and direct current (DC) electrical potential technique. The material parameter of creep fracture toughness, Kmatc, were obtained from analysis of 11 CCG tests at temperatures of 500 and 565°C. It has been found that for 21/4Cr1Mo steel Kmatc decreases with increasing time and increases with elevating temperature. For this reason, the value of Kmat c at lower temperature or longer service time can be used to extract a conservative result in the high temperature defect assessment where the accurate value of Kmatc is unavailable. It is also validated from this test that the proposed formula by Ainsworth et al can be adopted in practice.

AB - To assess the failure risk of high temperature structures, it is essential to obtain the creep fracture toughness of materials. In the present paper, Creep crack growth (CCG) tests for 21/4Cr1Mo steel have been carried out by utilizing the side grooved compact tension (CT) specimen and direct current (DC) electrical potential technique. The material parameter of creep fracture toughness, Kmatc, were obtained from analysis of 11 CCG tests at temperatures of 500 and 565°C. It has been found that for 21/4Cr1Mo steel Kmatc decreases with increasing time and increases with elevating temperature. For this reason, the value of Kmat c at lower temperature or longer service time can be used to extract a conservative result in the high temperature defect assessment where the accurate value of Kmatc is unavailable. It is also validated from this test that the proposed formula by Ainsworth et al can be adopted in practice.

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KW - Creep crack growth test

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On the creep fracture toughness of 21/4Cr1Mo steel

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Keywords

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