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Effect of Austenitising Temperature and Cooling Rate on Microstructure in a Hot-Work Tool Steel
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avd för tillverkningsprocesser. (PTW)ORCID-id: 0000-0001-5249-4207
Uddeholms AB.
The Swedish School of Mining and Metallurgy.
Nuclear Physics Institute ASCR.
Visa övriga samt affilieringar
2014 (Engelska)Ingår i: Proceedings of the 6th International Swedish Production Symposium / [ed] Stahre, Johan, Johansson, Björn & Björkman, Mats, 2014, s. 1-7Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

The effects on microstructucture of austenitising temperature and cooling rate during hardening were studied for a hot-work tool steel. Transformation temperatures were determined by dilatometry, scanning electron microscopy was used to characterise the microstructure and both retained austenite contents and their lattice parameters were measured by neutron diffraction. For lower cooling rates, lower austenitising temperatures produce larger amounts of both retained austenite and bainite. Retained austenite in bainitic structures is higher in carbon than in martensitic structures. Consequently, lowering the austenitising temperature will affect microstructure and properties.

Ort, förlag, år, upplaga, sidor
2014. s. 1-7
Nyckelord [en]
Austenitising temperature, bainitic reaction, retained austenite, lattice parameter
Nationell ämneskategori
Produktionsteknik, arbetsvetenskap och ergonomi
Forskningsämne
TEKNIK, Produktions- och materialteknik; Produktionsteknik
Identifikatorer
URN: urn:nbn:se:hv:diva-7009ISBN: 978-91-980974-1-2 (tryckt)OAI: oai:DiVA.org:hv-7009DiVA, id: diva2:764703
Konferens
The 6th Swedish Production Symposium
Tillgänglig från: 2014-11-20 Skapad: 2014-11-19 Senast uppdaterad: 2018-08-12Bibliografiskt granskad
Ingår i avhandling
1. Effect of austenitising temperature and cooling rate on microstructures of hot-work tool steels
Öppna denna publikation i ny flik eller fönster >>Effect of austenitising temperature and cooling rate on microstructures of hot-work tool steels
2015 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

The average size of hot-work tools has gradually increased over the past years.This affects the effective temperature cycle tools experience during hardening,as large dimensions prevent uniform and rapid cooling, and thereby the resulting microstructures and properties. In order to avoid the formation of coarse structures or cracking during heat treatment it has become common practise to lower the austenitising temperature below that recommended by the steel manufacturer.In this work, therefore, the effects of austenitising at temperatures lower thancommonly recommended are investigated. Three 5% Cr hot-work tool steelsalloyed with Mo and V were heat treated, resulting microstructures andtempering carbides were studied and transformation characteristics determined for different austenitising temperatures and different cooling rates. The temperatures and cooling rates have been chosen to be representative for heat treatments of different sizes of tools. Bainite rather than martensite formed during slow cooling regardless of austenitising temperature. A lowered austenitising temperature produced largeramounts of both bainite and retained austenite while a higher caused graingrowth. Carbon partitioning during the bainitic transformation resulted in anincrease of the carbon content in the retained austenite of at least 0.3 wt.%. The austenitising temperature influences also the type and amount of tempering carbides that precipitate, which affects the properties of the steel. Higher austenitising temperatures favour the precipitation of MC carbides during tempering. The Mo rich M2C type carbides were proven to be more prone to coarsening during service at 560°C-600°C, while V rich MC carbides preserve their fine distribution. A best practice heat treatment needs to balance the increase of grain size with increasing austenitising temperatures, with the possibility to form more tempering carbides. Higher austenitising temperatures also give less retained austenite, which can affect dimensional stability and toughness negatively after tempering

Ort, förlag, år, upplaga, sidor
Trollhättan: University West, 2015. s. 85
Serie
Licentiate Thesis: University West ; 4
Nyckelord
Tool steel, Heat Treatment, Austenitising Temperature, Large Tools, Tempering Carbides, Bainitic Microstructures
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsteknik; TEKNIK, Produktions- och materialteknik
Identifikatorer
urn:nbn:se:hv:diva-8614 (URN)978-91-87531-16-3 (ISBN)978-91-87531-15-6 (ISBN)
Opponent
Handledare
Tillgänglig från: 2015-11-11 Skapad: 2015-11-02 Senast uppdaterad: 2019-12-03Bibliografiskt granskad

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Coll Ferrari, Maria Teresa

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