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Oxide layer thickness modification of a dual phase steel by steam treatment
2012 (Engelska)Självständigt arbete på avancerad nivå (masterexamen), 20 poäng / 30 hpStudentuppsats (Examensarbete)
Abstract [en]

Low carbon steels have good mechanical properties that are utilised in various applications around the world. Dual phase steel structures consisting of ferrite and martensite provide a good combination of strength, formability and weldability. Under certain conditions, a desirable oxide layer can be formed on the base material, which improves the wear and corrosion properties. Black oxidation treatment is a metal finishing process, used to create an oxide layer on steels. The high temperature oxidation treatment also influences the mechanical properties of the steel by simultaneous annealing of the steel. In this work laboratory experiments simulating a black oxidizing treatment in industry have been performed. The dew points of water vapour, operation temperature, time of oxidation, partial pressure of oxygen and gas flow rate have been varied in the experiments. The analysis methods for determining the microstructure that have been used are optical microscopy (OM) and scanning electron microscopy (SEM). The composition of the oxide and base material was analysed using x-ray energy dispersive spectroscopy (EDS). The surface roughness of the oxide surface was determined by topographical profilometry. Hardness testing of cross sections of the final samples was also performed. The results showed that a higher dew point gives a thicker oxide layer. This is a result of higher water vapour content and water vapour pressure, which produces a higher partial pressure of oxygen in the system, enabling more oxygen to interact with the base material. With certain temperatures and oxidation treatment times the oxide layer thickness is influenced, as is the hardness of the material, which will become softer.

Ort, förlag, år, upplaga, sidor
2012.
Nyckelord [en]
Technology
Nyckelord [sv]
Teknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-49870Lokalt ID: 730028d0-2ef6-4c57-ab2b-724d2ec3cba8OAI: oai:DiVA.org:ltu-49870DiVA, id: diva2:1023218
Ämne / kurs
Examensarbete, minst 30 hp
Utbildningsprogram
Materialteknik, master
Examinatorer
Anmärkning
Validerat; 20120626 (anonymous)Tillgänglig från: 2016-10-04 Skapad: 2016-10-04Bibliografiskt granskad

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