ASM Failure Analysis Case Histories
ASM Failure Analysis Case Histories: Processing Errors and Defects
ASM International
ISBN electronic:
978-1-62708-235-8
Publication date:
2019
Book Chapter
Hydrogen Induced Cracking of a Tappet Adjusting Screw
By
B.V. Krishna
B.V. Krishna
Materials Science & Technology Division, Thapar Centre for Industrial Research and Development Thapar Technology Campus
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Published:2019
Abstract
The electroplated tappet adjusting screws used in diesel engines failed during initial bend testing. The analysis of the failure showed that the fracture was nucleated from the subsurface of the screw. The fracture surface was intergranular at the ID and OD region and microvoid coalescence in the center. The improper baking after electroplating of the screw led to H2-induced blistering/cracking. The high strength of the threaded region of the adjusting screw increased the failure propensity.
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B.V. Krishna, 2019. "Hydrogen Induced Cracking of a Tappet Adjusting Screw", ASM Failure Analysis Case Histories: Processing Errors and Defects
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