Date of Award

2009

Publication Type

Master Thesis

Degree Name

M.A.Sc.

Department

Mechanical, Automotive, and Materials Engineering

First Advisor

Derek O. Northwood

Second Advisor

Randy J. Bowers

Keywords

Applied sciences

Rights

info:eu-repo/semantics/openAccess

Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

Abstract

Nitrocarburizing is a thermochemical diffusion process that has been proposed as an alternative to carbonitriding to improve the surface characteristics of automotive components without producing unacceptable part distortion. In this study, gas, ion and vacuum ferritic nitrocarburizing using various heat treatment schedules were investigated and compared with a current carbonitriding procedure. Dimensional distortion and residual stresses in Navy C-Rings and torque converter pistons resulting from each treatment process were evaluated. The microstructure and microhardness, as well as the phase composition of the specimens, were also characterized.

The results of this study indicated that the nitrocarburizing process utilizing suitable heat treatment procedures gave rise to smaller size and shape variations in specimens than carbonitriding. However, given the tensile surface residual stresses induced by nitrocarburizing, additional wear testing needs to be carried out to confirm the possibility of replacing the current carbonitriding process with an appropriate ferritic nitrocarburizing procedure.

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