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Research Papers: Materials and Fabrication

Reduction in Fatigue Life in Cr-Coated Steel Induced by Pulsed Laser Heating

[+] Author and Article Information
Jeffrey M. Warrender

Benét Laboratories,
U.S. Army ARDEC,
Watervliet, NY 12189
e-mail: jwarrend@post.harvard.edu

Gregory N. Vigilante

Benét Laboratories,
U.S. Army ARDEC,
Watervliet, NY 12189

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received October 4, 2016; final manuscript received January 10, 2017; published online February 3, 2017. Assoc. Editor: Kunio Hasegawa.This material is declared a work of the U.S. Government and is not subject to copyright protection in the United States. Approved for public release; distribution is unlimited.

J. Pressure Vessel Technol 139(3), 031404 (Feb 03, 2017) (4 pages) Paper No: PVT-16-1183; doi: 10.1115/1.4035789 History: Received October 04, 2016; Revised January 10, 2017

Four-point bend tests were performed on Cr-coated steel specimens that were pulsed laser heated (PLH) with two pulses per area from a millisecond pulse duration laser. Cracks were observed in the PLH specimens extending to the substrate. Specimens subjected to PLH exhibited reduced cycles to failure under all the loadings. This indicates that the PLH process replaces the crack initiation process, and the PLH-formed cracks give the expected crack propagation behavior. This approach provides a method to separately study the effects of crack formation and crack propagation in fatigue life tests. It is especially applicable to situations in which the cracks to be propagated are induced by thermomechanical processes.

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Figures

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Fig. 1

Schematic illustration of four-point bend test geometry (dimensions are in millimeter)

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Fig. 2

Representative metallographic cross sections of specimens under three PLH conditions, as indicated on the images. Specimens were etched in 2% Nital solution prior to imaging.

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Fig. 3

Applied stress versus cycles to failure for specimens with three different initial crack depths ai. (Inset) Cycles to failure versus initial crack depth ai for three different specimens that received PLH and were all loaded at the same applied stress (540 MPa).

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Fig. 4

Cycles to failure for specimens irradiated under three different PLH conditions, corresponding to the three panels in Fig. 2 (Cr thickness = 200 μm and applied stress = 1140 MPa)

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