Name:
Kamrooz Riyahi
Born:
Iran-Tehran 1981
Education:
Postgraduate work on top slag optimization at Ovako Hofors AB , MSc in Metallurgical engineering from Luleå University of technology, BSc in Industrial Metallurgy from Azad University in Iran.
My thesis work:
I wrote my thesis work at the material research and development department of Ovako Hofors AB starting January to July 2009. The subject of the thesis was "Introduction to an impact fatigue testing method in order to assess the properties of different steel grades with various applied surface treatments".
During this project, several different steel grades that were made by Ovako Hofors AB were chosen, then they were treated differently (annealed, through hardened, carburized, nitridized, induction hardened, and DLC coated), finally by the means of an in house Vibrophore machine a custom made cyclic impactor a test setup were introduced.
Samples were tested in two different force conditions of 1900N and 2400N, and in four different impact cycles as per 1e3, 1e4, 1e5, 5e5, then surfaces of these specimens were analyzed both macroscopically and microscopically and achieved results were documented. Finally a comparison among the size of the biggest appeared surface ring cracks, number of appeared surface ring cracks that were above 40µm, indentation radius and penetration depth of the impacted surface areas after applying cyclic impact force were made, and results were shown.
As the final result of the introduced impact fatigue test it is concluded that samples designated as I and H (Ovako steel grade 804Q_DLC coated, 528Q_DLC respectively) had the same and best impact fatigue resistance among the tested samples.
My experiences of the company and my colleagues:
Swedish colleagues are very kind and helpful, and they were ready and willing to help me any time I needed their help or advice.
I can recommend Ovako for other students:
Ovako is a company full of opportunities and undoubtedly is the perfect place for those students who are interested in the steel making metallurgy and/or material science, and are willing to extent their knowledge about advanced steel making process. I do believe there are not many companies in the world that have the same equipment and steel making ''know how'' as Ovako and it's personal.
My work today:
I am now working as a PhD candidate in the research and development department of Ovako Hofors AB. The subject of my PhD work is ''Top slag optimization in the ladle furnace''. I am very satisfied with what I am doing now, because I am learning every day more and more in a real working situation, I can see and measure the tangible result of my job, and work in this environment is really fun.
''Being a part of Ovako demands genuine interest and potential, if you have them both, here is the best place to work, don't waste time and join us''.