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Full-Text Articles in Engineering Science and Materials

High Strain Rate Dynamic Response Of Aluminum 6061 Micro Particles At Elevated Temperatures And Varying Oxide Thicknesses Of Substrate Surface, Carmine Taglienti Jul 2018

High Strain Rate Dynamic Response Of Aluminum 6061 Micro Particles At Elevated Temperatures And Varying Oxide Thicknesses Of Substrate Surface, Carmine Taglienti

Masters Theses

Cold spray is a unique additive manufacturing process, where a large number of ductile metal micro particles are deposited to create new surface coatings or free-standing structures. Metallic particles are accelerated through a gas stream, reaching velocities of over 1 km/s. Accelerated particles experience a high-strain-rate microscopic ballistic collisions against a target substrate. Large amounts of kinetic energy results in extreme plastic deformation of the particles and substrate. Though the cold spray process has been in use for decades, the extreme material science behind the deformation of particles has not been well understood due to experimental difficulties arising from ...


Simulation Of Gas Dynamic Cold Spray Process, Sai Rajkumar Vadla Jan 2018

Simulation Of Gas Dynamic Cold Spray Process, Sai Rajkumar Vadla

Electronic Theses and Dissertations

The utilization of computational fluid dynamics (CFD) as a study tool in the aerodynamics and turbomachinery industry reinforces efficiency in the design of aircraft or for understanding the flow through pipes. CFD offer tools to model different geometries and perform a more extensive study of the flow phenomena. This gives the opportunity to model a variety of geometries and analyze their behavior under different operating conditions. A similar approach can be applied to coating technologies. Coating technologies play an essential role in the manufacturing industry. Their ability to form layers of specific materials onto engineering components to enhance mechanical and ...


Repairing Casting Defects By High Pressure Cold Spraying Method, Prathamesh Shivakumar Patil Jan 2017

Repairing Casting Defects By High Pressure Cold Spraying Method, Prathamesh Shivakumar Patil

Graduate Theses and Dissertations

The objective of this study was to investigate whether high pressure cold spray can be used to repair casting defects. The experiment conducted involved microstructural observations and mechanical property measurements of 316L stainless steel powder (20-44μ) cold sprayed coatings deposited onto a cast CA6NM martensitic stainless-steel substrate. The substrate was cold sprayed by hand using a VRC GEN III Cold Spray System with Nitrogen as the carrier gas. Substrate holes with different sizes and preparation techniques were created to mimic casting porosity. The backside of the plate was machined smooth and cold spray filled to perform ASTM C633 adhesion testing ...


Improving The Quality Of High Alloy Ca6nm Stainless Steel Castings, Rubesh Ganesan Jan 2015

Improving The Quality Of High Alloy Ca6nm Stainless Steel Castings, Rubesh Ganesan

Graduate Theses and Dissertations

This paper describes two studies performed on CA6NM martensitic stainless steel. The goal of the first study was to investigate claims that CA6NM hardness could be held below Rockwell C (Rc) 23 as per NACE requirements using an ice water quench. This research was performed on three grades of CA6NM, namely, A487 Class A, A487 Class B and A743 in both as-received and as-cast conditions. A double tempering at 667ºC and 607ºC followed by different cooling techniques after solutionizing and tempering was employed to test the hypothesis. The holding time for each tempering step was also changed to study the ...