Failure Analysis of Weld Crack of P92 Steel
| Autor: | Yu Zhong Wei, Gan Gang Wang, Tian Zuo Liu, Shao Hua Yin, Jian Lin Zhang, Peng Cheng |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Mechanical Engineering Metallurgy technology industry and agriculture Crack tip opening displacement Welding respiratory system Crack growth resistance curve law.invention Crack closure Brittleness Mechanics of Materials law mental disorders Fracture (geology) General Materials Science Joint (geology) Tensile testing |
| Zdroj: | Key Engineering Materials. 737:50-55 |
| ISSN: | 1662-9795 |
| DOI: | 10.4028/www.scientific.net/kem.737.50 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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