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Influence of temperature on wear mechanisms in nitrited tool steel for forming of aluminium
2003 (English)Independent thesis Advanced level (degree of Master (One Year))Student thesis
Abstract [en]

Aluminium and aluminium alloys are a most economical and attractive material for a wide range of applications, because of their properties; low density, fabricability, physical properties, mechanical properties and corrosion resistance. Manufacturing of aluminium and aluminium alloys are as well very widespread, it manufactures well by forming, forging, extrusion and casting operations. In this study the wear properties of aluminium against steel are examined from room temperature up to 550 °C, so it includes the most part of wrought aluminium products, sheet, plate, forgings, etc. The wear problem of steel dies used in production of aluminium is of a big importance. Nitriding of steel surface improves the wear resistance of dies greatly, but still the wear problem influences the lifetime of dies and the surface quality of aluminium products. Development of nitriding-treatments is one interesting area in industrial production of aluminium parts. Wear mechanisms of nitrided and untreated steel have been studied in this thesis. The wear experimental was carried out using a block-on-cylinder configuration and dry sliding condition in an atmosphere of 98% Ar and 2% N. The material of the block was hot-work tool steel AISI H13, and the cylinder represented by aluminium AA6063. The tests were made at three different temperatures, 200, 400 and 550 °C. The dominating wear mechanism was delamination at 200 and 400 °C, and chemical wear at 550 °C. Formation of intermetallic layers was observed at 400 and 550°C. Chemical wear dominated in untreated steel specimens.

Place, publisher, year, edition, pages
2003. , 45 p.
Identifiers
URN: urn:nbn:se:kau:diva-57210Local ID: MTK D-2OAI: oai:DiVA.org:kau-57210DiVA: diva2:1121813
Subject / course
Mechanical Engineering
Available from: 2017-07-12 Created: 2017-07-12

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