Failure analysis of superalloy bolts for reducer cover plate

doi:10.13251/j.issn.0254-6051.2023.08.048

Abstract

Abstract: During the abnormal life cycle of the butterfly valve equipped in the dehydrogenation unit of a company, the nickel-base alloy bolts of the blind flange were broken. Through dimension measurement and stress deformation analysis, the fracture sequence of bolts was confirmed. Further physical and chemical analysis on the first broken piece confirms that the bolt fracture is brittle type, which is related to improper heat treatment in the manufacturing process, thus a large number of fibre structures without complete recovery and recrystallization are resulted.

Key words: superalloy, bolt, first broken piece, brittle fracture, fiber structure

CLC Number:

TG157

Jing Dong. Failure analysis of superalloy bolts for reducer cover plate[J]. Heat Treatment of Metals, 2023, 48(8): 291-294.

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