Effects of Cold Spray Repairs on the Mechanical Properties of a Component
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Authors
Nieto, Andy
Ansell, Troy
Subjects
Cold Spray
Mechanical Properties
Heat Treatment
Mechanical Properties
Heat Treatment
Advisors
Date of Issue
2021
Date
2021
Publisher
Monterey, California: Naval Postgraduate School
Monterey, California. Naval Postgraduate School.
Monterey, California. Naval Postgraduate School.
Language
en_US
Abstract
Cold dynamic gas spray, better known as cold spray, has generated much interest for repairing metallic components and depositing protective metal coatings. Naval shipyards recognize the potential of this technology to provide rapid repair and manufacturing capability and to replace welding as the state-of-the-art for metal joining and repairs. As cold spray evolves into a mature technology, there is a need to understand the mechanical behavior of widely used engineering alloys such as the cupronickel alloys. This study investigates the mechanical behavior of Cu-38Ni coatings cold sprayed onto Cu-10Ni substrates with and without an annealing heat treatment. The cold sprayed coated specimens undergo uniaxial tensile tests to study the durability of the cold sprayed coating layer and its effects on the overall mechanical behavior of the coated substrate. Annealing at 650 °C is found to enhance both the ductility and strength of the coating material. The annealed coating specimen experiences an elongation to failure of ~13.7%, while the as-sprayed specimen only experienced ~3.9% elongation. Adhesion tests show that annealing leads to a large increase in adhesion strength of the coating to the substrate due to solid state diffusion across the interface during the heat treatment. Annealing further leads to a reduction in pores, intersplat cracks and porosity, and a more ductile and tough material due to recrystallized grains. Nanoindentation reveals that the cold as-sprayed material is the hardest, but also the most brittle, exhibiting plasticity of only 81%, as compared to 89-90% for the annealed coating and the substrates.
Type
Poster
Description
NPS NRP Project Poster
Series/Report No
Department
Mechanical and Aerospace Engineering
Organization
Naval Research Program (NRP)
Identifiers
NPS Report Number
Sponsors
Naval Sea Systems Command (NAVSEA)
ASN(RDA) - Research, Development, and Acquisition
ASN(RDA) - Research, Development, and Acquisition
Funding
This research is supported by funding from the Naval Postgraduate School, Naval Research Program (PE 0605853N/2098). https://nps.edu/nrp
Chief of Naval Operations (CNO)
Chief of Naval Operations (CNO)
Format
Citation
Distribution Statement
Approved for public release. Distribution is unlimited.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.