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Projects / Programmes source: ARIS

Influence of vacuum heat treatment, deep-cryogenic treatment and pulse plasma nitriding on mechanical fatigue and wear of high-speed and ledeburitic steels

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Research activity

Code Science Field Subfield
2.04.00  Engineering sciences and technologies  Materials science and technology   

Code Science Field
T150  Technological sciences  Material technology 
Keywords
high-speed steels, ledeburitic steels, vacuum heat treatment, deep-cryogenic treatment, plasma nitriding, sintering, mechanical fatigue, fracture toughness
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 (9)
no. Code Name and surname Research area Role Period No. of publications
1.  10762  MSc Boštjan Arh  Materials science and technology  Researcher  2004 - 2007  196 
2.  08236  Boris Arzenšek  Materials science and technology  Researcher  2004 - 2007  225 
3.  09434  PhD Mirko Doberšek  Materials science and technology  Researcher  2004 - 2007  162 
4.  23784  PhD Jozef Janovec  Materials science and technology  Researcher  2004 - 2005  67 
5.  21339  PhD Gorazd Jutriša  Materials science and technology  Junior researcher  2004 - 2005  25 
6.  07642  PhD Vojteh Leskovšek  Materials science and technology  Head  2004 - 2007  359 
7.  08195  PhD Borivoj Šuštaršič  Materials science and technology  Researcher  2004 - 2007  412 
8.  08001  PhD Franc Tehovnik  Materials science and technology  Researcher  2004 - 2007  324 
9.  05438  PhD Matjaž Torkar  Materials science and technology  Researcher  2004 - 2007  469 
Organisations (1)
no. Code Research organisation City Registration number No. of publications
1.  0206  Institute of Metals and Technology  Ljubljana  5051622000  6,011 
Abstract
Dies from high-speed steels for uniaxial powder die compaction of sintered parts for automotive industry are exposed to severe mechanical cyclic loading, which puts high demands on the die material. Thus are numerous phenomena which restrict die life. The most important are: cracking and indentation, mechanical fatigue, wear and corrosion/erosion. Mechanical fatigue is gradual cracking due to mechanical stresses from many compressive cycles and is a micro scale phenomenon taking place only in a thin surface layer or strees raisers. Mechanical fatigue cracks are caused by the combination of mechanical cyclic stress, tensile stress and plastic strain. Plastic strain initiates the crack and tensile stress promotes the crack growth. The following factors influence mechanical fatigue: applied load, basic die material properties and stress raisers. Due to the high number of factors influencing mechanical fatigue 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 of three dies made from ESR or PM W. No. 1.3343 steel shows that it is possible to enhance die life by 100%. Therefore, it is expected that with the systematical accession to optimisation of vacuum heat treatment, deep cryogenic treatment and ion nitriding of the selected steel W.No. 1.3343 it will be possible to influence the properties of the steel (ratio between fracture toughness and hardness) and in this manner to obtain greater resistance against cracking and indentation, mechanical fatigue, abrasive and adhesive wear and corrosion/erosion. By a systematic study of influence factors, and by research and experimental work we shall link together process parameters of vacuum heat treatment, deep-cryogenic 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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