Thesis Defense - Onur Bilgin (MSME)

Onur Bilgin – M.Sc. Mechanical Engineering

Assoc. Prof. Güney Güven Yapıcı – Advisor

Date: 15.08.2022

Time: 13.00

Location: AB1 246

“Effect of Different Surface Treatments on the Tensile and Wear

Behavior of Inconel 625 Superalloy and AISI 321 Stainless Stl”

Assoc.Prof. Güney Güven Yapıcı, Özyeğin University

Assist. Prof. Altuğ Melik Başol, Özyeğin University

Assist. Prof. Mehmet İpekoğlu, Turkish-German University

Abstract:

AISI 321 stainless steel and Inconel 625 superalloy are utilized in an extensive range of applications such as aircraft engines, nuclear powerplants and industrial furnaces due to their excellent mechanical properties at high temperatures.

The surface treatment of these materials is necessary due to the extreme working environments. Boronizing and WC coating is the most important surface hardening processes. In the current work, the effect of boronizing and WC coating on the wear performance and tensile behavior of AISI 321 and Inconel 625 at room and high temperatures were investigated. Furthermore, damage mechanisms and fracture morphologies were observed using Scanning Electron Microscopy (SEM) and optical profilometry.

The results were shown that the wear rates of boronized and WC coated AISI 321 were extremely lower than that of the uncoated sample. On the other hand, at 600°C, WC coated wear rate was still lower but the uncoated and boronized samples' values were similar to the room temperature results. Inspection of room temperature the wear test results revealed that the wear rates of Inconel 625 uncoated and coated samples were similar to the results of AISI 321. WC coated samples' wear rate was tremendously lower than the others. At high temperatures, the boronized Inconel 625 had a higher friction coefficient than the WC coated sample. A fluctuation was also noticed, which is linked to boron particle aggregation on the surface at high temperatures.

Bio:

Onur Bilgin went on to continue his academic education in Istanbul Technical University, Turkey, where he obtained a BS in Manufacturing Engineering in September of 2015. His bachelor's project was focusing on the design of rotating bending fatigue machine for the bar shaped materials. Upon graduation, Onur moved his studies to MEMFIS group under the supervision of Dr. Yapıcı. While contributing to MEMFIS, he has been working towards his MS degree in Mechanical Engineering at Ozyegin University. He had been working on the heavy trucks’ exhaust urea injector systems as a project researcher in the TUBİTAK project with Ozyegin University and Ford Otosan. He is currently working as a mechanical design engineer in the defense industry.