Failure Analysis of Weld Crack of P92 Steel

Shao Hua Yin; Yu Zhong Wei; Gan Gang Wang; Tian Zuo Liu; Peng Cheng; Jian Lin Zhang

doi:10.4028/www.scientific.net/KEM.737.50

Paper Titles

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Microstructural Evolution and Mechanical Properties in a Mn_1.05Fe_1.05CoNiCu_0.9 High Entropy Alloy
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Failure Analysis of Weld Crack of P92 Steel
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HomeKey Engineering MaterialsKey Engineering Materials Vol. 737Failure Analysis of Weld Crack of P92 Steel

Failure Analysis of Weld Crack of P92 Steel

Abstract:

In order to find out the causes of weld cracks in the main steam pipe welded joint of a power plant, a series of relevant tests are specially formulated, which include room temperature tensile and high temperature tensile test, room temperature impact test, the crack tip metallographic observation, crack fracture scanning electron microscope observation, oxide film thickness measurement, and so on. By analyzing the metallographic photographs of the crack, the crack character is preliminarily determined. In addition, the direction of crack extension is determined by the thickness of oxide film in different parts. The crack failure mechanism has been identified. The results show that the welding heat crack occurs in 1# crack initiation position; and the crack initiation in 2# weld crack (primary crack) position is caused by the root defect of welding seam and lead to a high brittleness, which results in the crack failure by crack propagating in operational process gradually.

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Periodical:

Key Engineering Materials (Volume 737)

Pages:

50-55

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.737.50

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Online since:

June 2017

Authors:

Shao Hua Yin*, Yu Zhong Wei, Gan Gang Wang, Tian Zuo Liu, Peng Cheng, Jian Lin Zhang

Keywords:

Brittle Fracture, Failure Analysis, Hot Crack, P92 Steel, Welded Joint

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