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      Sub-Zero Treatment of Cold Work Tool Steels – Metallurgical Background and the Effect on Microstructure and Properties* Translated title: Tiefkühlbehandlung von Kaltarbeitsstählen – metallurgischer Hintergrund und Auswirkung auf Gefüge und Eigenschaften

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          Abstract

          Sub-zero treatment is a commonly accepted process that is intended to increase the hardness, wear resistance and dimensional stability of tool steels and components over several decades. However, the metallurgical background of the phenomena responsible for these improvements is not yet entirely clear. Several theories have attempted to clarify the phenomena taking place during sub-zero treatment and their effect on the microstructure and properties of steels, but all of them manifested significant drawbacks from the point of view of generally accepted metallurgical theories. In this study, these theories are discussed based upon the results obtained by comprehensive investigations of sub-zero treatment of powder metallurgy-made Cr-V Vanadis 6 ledeburitic tool steel. A new theory respecting the main physical-metallurgical principles is also established.

          Kurzfassung

          Das Tiefkühlen ist als Prozessschritt zur Steigerung der Härte, des Verschleißwiderstandes und der Maßbeständigkeit von Werkzeugen und Bauteilen anerkannt. Der metallurgische Hintergrund der Phänomene, die hierfür verantwortlich sind, ist jedoch noch nicht vollständig verstanden. Es gibt verschiedene Theorien, um die bei einer Tiefkühlbehandlung ablaufenden Vorgänge und deren Einfluss auf Gefüge und Eigenschaften zu erklären, aber jede weist im Hinblick auf allgemein akzeptierte werkstofftechnische Theorien Nachteile auf. Die Veröffentlichung diskutiert diese Theorien auf der Basis umfangreicher Untersuchungen von Tieftemperaturbehandlungen an einem pulvermetallurgisch hergestellten ledeburitischen Cr-V-Stahl und stellt eine neue Theorie vor, die die wichtigsten metallkundlichen Theorien berücksichtigt.

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          Most cited references 35

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          Low-temperature martensitic transformation in tool steels in relation to their deep cryogenic treatment

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            The tempering of iron- carbon martensite; dilatometric and calorimetric analysis

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              Sub-zero treatments of AISI D2 steel: Part I. Microstructure and hardness

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                Author and article information

                Journal
                htme
                HTM Journal of Heat Treatment and Materials
                Carl Hanser Verlag
                1867-2493
                2194-1831
                15 February 2017
                : 72
                : 1
                : 62-68
                Affiliations
                1 Department of Materials, Faculty of Materials and Technology of the STU, Trnava, Paulínská 16, 917 24 Trnava, Slovak Republic, p.jurci@ 123456seznam.cz
                Author notes
                [*]

                Lecture at the European Conference on Heat Treatment 2016 and 3 rd International Conference on Heat Treatment and Surface Engineering in Automotive Applications, 11–13 May 2016, Prague, Czech Republic

                Article
                HT110301
                10.3139/105.110301
                © 2017, Carl Hanser Verlag, München
                Page count
                References: 35, Pages: 7
                Product
                Self URI (journal page): http://www.hanser-elibrary.com/loi/htme
                Categories
                Fachbeiträge/Technical Contributions

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