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Introduction to an impact fatigue testing method in order to assess the properties of different steel grades with various applied surface treatments
2009 (Engelska)Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
Abstract [en]

During this project, several different steel grades that were made by Ovako steel company 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, and a costume 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 1000, 10000, 100000, 500000, 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, following by DLC coated samples designated as G (803J), these samples were followed from the best to worst as per samples E (528Q_induction hardened), samples B (256G_carburized), samples J (804Q_through hardened), samples D (277Q_nitrided), samples C (225A_nitrided), and worst achieved results were from samples designated as A (804Q_annealed).

Ort, förlag, år, upplaga, sidor
2009.
Nyckelord [en]
Physics Chemistry Maths, Impact fatigue, test, surface treated, steels, surface crack, evaluation
Nyckelord [sv]
Fysik, Kemi, Matematik
Identifikatorer
URN: urn:nbn:se:ltu:diva-48307ISRN: LTU-PB-EX--09/084--SELokalt ID: 5c390c9d-dd97-4ca4-8bd0-7f4aa1db3634OAI: oai:DiVA.org:ltu-48307DiVA, id: diva2:1021648
Ämne / kurs
Examensarbete, minst 30 hp
Utbildningsprogram
Kemiteknik, master
Examinatorer
Anmärkning
Validerat; 20101217 (root)Tillgänglig från: 2016-10-04 Skapad: 2016-10-04Bibliografiskt granskad

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