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Fatigue behavior of a 4140 steel coated with a Colmonoy 88 alloy applied by HVOF by E.S. Puchi Cabrera; J.A. Berrı́os-Ortiz; J. Da-Silva; J. Nunes is a Engineering article available to read on EtoBox.
What is Fatigue behavior of a 4140 steel coated with a Colmonoy 88 alloy applied by HVOF about?
The fatigue behavior of a quenched and tempered AISI 4140 steel has been investigated, both uncoated and after coating with a deposit of NiCrBSiW alloy (Colmonoy 88) of approximately 240-250 mm in thickness, applied by HVOF thermal spraying. Previous to the deposition of the Colmonoy 88 alloy, an intermediate layer of a NiMoAl alloy known commercially as Metco 447 of approximately 60-70 mm was also applied by means of HVOF thermal spraying, in order to avoid grid blasting of the steel substrate with alumina particles. It has been determined that coating this steel substrate with such a deposit leads to a significant reduction in fatigue properties in comparison with the uncoated substrate. The reduction in fatigue life, evaluated in the alternating stress range of 544-598 MPa has been found to achieve up to 99.8%, whereas, the decrease in fatigue limit was approximately 43%, that is to say 220 MPa below the fatigue limit of the uncoated substrate. It has been shown that such a decrease in fatigue properties can be attributed almost entirely to the presence of both the intermediate bonding layer and coating, rather than to the inclusion of the coating thickness in the computation of
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- Author
- E.S. Puchi Cabrera; J.A. Berrı́os-Ortiz; J. Da-Silva; J. Nunes
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 0257-8972)
- Published
- 2003
- Language
- EN
- Field
- Engineering (Physical Sciences)