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Effect of heat treatment on microstructure and mechanical properties of a 5 wt.% Cr cold work tool steel
Högskolan Väst, Institutionen för ingenjörsvetenskap, Forskningsmiljön produktionsteknik(PTW). (PTW)ORCID-id: 0000-0001-6300-5923
2019 (Engelska)Doktorsavhandling, monografi (Övrigt vetenskapligt)
Abstract [en]

This work presents investigations related to phase transformations occurring inthe 5 wt.% Cr cold work tool steel Caldie during hardening and tempering treatments. The influence of austenitisation temperature, cooling rate, sub-zero cooling, isothermal treatment during cooling, tempering temperature and holding time on the microstructure and mechanical properties were investigated.The hardened microstructure of the investigated steel consisted of a mixture ofplate and lath martensite, minor amounts of bainite, blocky and thin retained austenite and M7C3 carbides. Increasing austenitisation temperature from 1020°Cto 1050°C was found useful as it provided higher hardness, good compressive strength and sufficient toughness. However, a further increase to 1075°C resulted in large prior austenite grains which produced coarse martensite containing somewhat increased carbon content. This was found to reduce the impacttoughness of the steel. Significant amounts of retained austenite were present after tempering for 2x2 h between 200°C and 500°C while tempering at 525°C or higher, reduced retained austenite content to below 2%. During holding at tempering temperature carbides precipitated in martensite and possibly in retained austenite. The retained austenite was thereby destabilised and transformed to martensite on cooling. This fresh martensite was tempered by following tempering treatments. It was concluded that tempering at 525°C for 2x2 h was suitable to achieve a good combination of hardness, compressive strength and impact toughness. Retained austenite was also found to transform during holding at 600°C for longer times. Initially, carbides formed in the austenite and after some time transformation of retained austenite to ferrite and carbides took place. Results were used to discuss alternative heat treatment procedures for the 5wt.% Cr cold work tool steel Caldie and some changes of current heat treatment recommendations were suggested.

Ort, förlag, år, upplaga, sidor
Trollhättan: University West , 2019. , s. 160
Serie
PhD Thesis: University West
Nyckelord [en]
Cold work tool steel; Hardening; Tempering; Microstructural characterisation; Retained austenite; Martensite; Bainite; Hardness; Impact toughness
Nationell ämneskategori
Bearbetnings-, yt- och fogningsteknik
Forskningsämne
Produktionsteknik; TEKNIK, Produktions- och materialteknik
Identifikatorer
URN: urn:nbn:se:hv:diva-13750ISBN: 978-91-88847-27-0 (tryckt)ISBN: 978-91-88847-26-3 (digital)OAI: oai:DiVA.org:hv-13750DiVA, id: diva2:1301179
Disputation
2019-04-23, F131, Trollhättan, 10:00 (Engelska)
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Tillgänglig från: 2019-04-02 Skapad: 2019-04-01 Senast uppdaterad: 2019-04-01Bibliografiskt granskad

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