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ASM Failure Analysis Case Histories

Handbook of Case Histories in Failure Analysis

Edited by
Khlefa A. Esaklul
Khlefa A. Esaklul
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ASM International
Volume
1
ISBN electronic:
978-1-62708-214-3
Publication date:
1992
Book Chapter

Environmentally-Induced Fracture of Type 410 Martensitic Stainless Steel Self-Drilling Tapping Screws

By
Durgam G. Chakrapani
Durgam G. Chakrapani
MEI-Charlton, Inc.
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Published:
1992
Page range:
305 - 307

Abstract

Cadmium-coated type 410 martensitic stainless steel 14-14 self-drilling tapping screws fractured during retorquing tests within a few weeks after installation. The screws were used to assemble structural steel frames for granite panels that formed the outer skin of a high-rise building. Fractographic and metallographic examination showed that the fractures occurred in a brittle manner from intergranular crack propagation. Laboratory and simulated environmental tests showed that an aqueous environment was necessary for the brittle fracture/cracking phenomenon. The cracks were singular and intergranular with little branching. Secondary subsurface cracks suggested possible hydrogen embrittlement. The 410 screws had been introduced to replace conventional case-hardened carbon steel screws that conform to SAE specification J78. Carbon steel screws had a proven record of acceptable performance for the intended application. It was recommended that use of the 410 screws be discontinued in preference to the case-hardened carbon steel screws.

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Durgam G. Chakrapani, 1992. "Environmentally-Induced Fracture of Type 410 Martensitic Stainless Steel Self-Drilling Tapping Screws", Handbook of Case Histories in Failure Analysis, Khlefa A. Esaklul

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