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Influence of vacuum heat treatment and ion nitriding on thermal fatigue resistance of tool steel w.no.1.2343 (utop mo1)

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Research activity

Code Science Field Subfield
2.04.02  Engineering sciences and technologies  Materials science and technology  Metallic materials 

Code Science Field
T151  Technological sciences  Optical materials 
Keywords
die forging, vacuum heat treatment, ion nitriding, microstrukture, mechanical properties
Evaluation (rules)
source: COBISS
Evaluation of bibliographic research performance indicators according to ARIS methodology
Citations Citations for bibliographic records in COBIB.SI that are linked to records in citation databases
source: WoS source: Scopus source: COBISS
Researchers (7)
no. Code Name and surname Research area Role Period No. of publications
1.  10762  MSc Boštjan Arh  Materials science and technology  Researcher  2002 - 2004  0 
2.  08236  Boris Arzenšek  Materials science and technology  Researcher  2002 - 2004  0 
3.  21339  PhD Gorazd Jutriša  Materials science and technology  Researcher  2002 - 2004  0 
4.  17202  Franc Kandare    Researcher  2002 - 2004  0 
5.  07642  PhD Vojteh Leskovšek  Materials science and technology  Head  2002 - 2004  0 
6.  08195  PhD Borivoj Šuštaršič  Materials science and technology  Researcher  2002 - 2004  0 
7.  08001  PhD Franc Tehovnik  Materials science and technology  Researcher  2002 - 2004  0 
Organisations (1)
no. Code Research organisation City Registration number No. of publications
1.  0206  Institute of Metals and Technology  Ljubljana  5051622000  0 
Abstract
Dies for open-die forging are exposed to severe thermal and mechanical cyclic loading, which puts high demands on the die material. There are thus a number of phenomena which restrict die life. The most important are: thermal fatigue (heat checking), corrosion/erosion, cracking and indentation. Thermal fatigue is gradual cracking due to thermal stresses from many temperature cycles and is a micro scale phenomenon taking place only in a thin surface layer. Thermal fatigue cracks are caused by the combination of thermal cyclic stress, tensile stress and plastic strain. Plastic strain initiates the crack and tensile stress promotes the crack growth. The following factors influence thermal fatigue: die temperature cycle, basic die material properties and stress raisers. Due to the high number of factors influencing thermal fatigue (heat checking) of dies we will try to establish the actual state and examine the most significant factors causing this phenomenon. Previous work in the field of optimisation of vacuum heat treatment and ion nitriding of die casting dies made from W. No. 1.2343 steel shows that it is possible to enhance die life by 30-40%. Therefore, it is expected that with the optimisation of vacuum heat treatment and ion nitriding of the selected steel W.No. 1.2343 (Utop Mo1) it will be possible to influence the properties of the steel (ratio between hardness and fracture toughness) and in this manner to obtain greater resistance to thermal fatigue, corrosion/erosion, cracking and indentation. By a systematic study of influence factors, and by research and experimental work we shall link together process parameters of vacuum heat treatment and ion nitriding with microstructural properties of heat treated tool steel and its mechanical properties, which are important for the enhancement of die life in real conditions of exploitation.
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