On the Creep Fracture Toughness of 2¼Cr1Mo Steel

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

doi:10.4028/www.scientific.net/KEM.297-300.1464

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 297-300On the Creep Fracture Toughness of 2¼Cr1Mo Steel

On the Creep Fracture Toughness of 2¼Cr1Mo Steel

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 2¼Cr1Mo 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, c mat K , were obtained from analysis of 11 CCG tests at temperatures of 500 and 565oC. It has been found that for 2¼Cr1Mo steel c mat K decreases with increasing time and increases with elevating temperature. For this reason, the value of c mat K 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 c mat K 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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Periodical:

Key Engineering Materials (Volumes 297-300)

Pages:

1464-1469

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.297-300.1464

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Online since:

November 2005

Authors:

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

Keywords:

2¼Cr1Mo Steel, Creep Crack Growth Test, Creep Fracture Toughness, High-Temperature

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References

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