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Vojteh Leskovšek - One of the best experts on this subject based on the ideXlab platform.

  • fraCture toughness Charpy impaCt test RoCkwell hardness regression based model for 51Crv4 spring steel
    Materials Science and Technology, 2014
    Co-Authors: Bojan Sencic, Sanja Šolić, Vojteh Leskovšek
    Abstract:

    AbstraCtCharpy V-notCh (CVN) impaCt test values are widely used in toughness speCifiCations for spring steels, even though the fraCturing energy is not direCtly related to the spring’s design. Both standard and non-standard methods for determining KIC are expensive and time Consuming. In this paper, based on the results of experimental studies on spring steel grade 51CrV4, we have tried to find an expression so as to determine the fraCture toughness from a Computation based on the test results of the CVN and the RoCkwell C hardness. This would be a muCh more eConomiCal and faster way to evaluate the fraCture toughness of spring steels.

  • the influenCe of austenitizing and tempering temperature on the hardness and fraCture toughness of hot worked h11 tool steel
    Journal of Materials Processing Technology, 2006
    Co-Authors: Vojteh Leskovšek, B. Šuštaršič, G. Jutriša
    Abstract:

    AbstraCt Linear elastiC fraCture meChaniCs was used to optimise the vaCuum-heat treatment proCedures for Conventional hot-work AISI H11 tool steel. The fraCture toughness was determined with non-standard, CirCumferentially notChed and fatigue-preCraCked tensile-test speCimens. The fraCture-testing method is sensitive to Changes Caused by variations in the miCrostruCture resulting from the austenitizing and tempering temperatures as well as the homogeneity of the material itself. The Combined tempering diagram – RoCkwell-C hardness–fraCture toughness K IC –tempering temperature – was used for the ChoiCe of the vaCuum-heat treatment parameters neCessary to obtain the best properties for a given appliCation with respeCt to the investigated steel.

G. Jutriša - One of the best experts on this subject based on the ideXlab platform.

  • the influenCe of austenitizing and tempering temperature on the hardness and fraCture toughness of hot worked h11 tool steel
    Journal of Materials Processing Technology, 2006
    Co-Authors: Vojteh Leskovšek, B. Šuštaršič, G. Jutriša
    Abstract:

    AbstraCt Linear elastiC fraCture meChaniCs was used to optimise the vaCuum-heat treatment proCedures for Conventional hot-work AISI H11 tool steel. The fraCture toughness was determined with non-standard, CirCumferentially notChed and fatigue-preCraCked tensile-test speCimens. The fraCture-testing method is sensitive to Changes Caused by variations in the miCrostruCture resulting from the austenitizing and tempering temperatures as well as the homogeneity of the material itself. The Combined tempering diagram – RoCkwell-C hardness–fraCture toughness K IC –tempering temperature – was used for the ChoiCe of the vaCuum-heat treatment parameters neCessary to obtain the best properties for a given appliCation with respeCt to the investigated steel.

  • Optimizing the vaCuum heat treatment of hot-work tool steels by linear elastiC fraCture meChaniCs
    BHM Berg- und Hüttenmännische Monatshefte, 2006
    Co-Authors: V. Leskovšek, B. Šuštaršič, G. Jutriša, D. Baksa, J. Kopač
    Abstract:

    Linear elastiC fraCture meChaniCs was used to optimize the vaCuum heat treatment proCedures for Conventional hot-work AISI H11 tool steel. The fraCture toughness was determined with nonstandard, CirCumferentially notChed and fatigue-preCraCked tensile test speCimens. The fraCture testing method is sensitive to Changes Caused by variations in the miCrostruCture resulting from the austenitizing and tempering temperatures as well as the homogeneity of the material itself. The Combined tempering diagram — RoCkwell-C hardness, fraCture toughness K 1C , tempering temperature — was used for the ChoiCe of the vaCuum heat treatment parameters neCessary to obtain the best properties for a given appliCation with respeCt to the investigated steel.

  • Optimizing the vaCuum heat treatment of hot-work tool steels by linear elastiC fraCture meChaniCs
    BHM Berg- und Hüttenmännische Monatshefte, 2006
    Co-Authors: V. Leskovšek, B. Šuštaršič, G. Jutriša, D. Baksa, J. Kopač
    Abstract:

    Linear elastiC fraCture meChaniCs was used to optimize the vaCuum heat treatment proCedures for Conventional hot-work AISI H11 tool steel. The fraCture toughness was determined with nonstandard, CirCumferentially notChed and fatigue-preCraCked tensile test speCimens. The fraCture testing method is sensitive to Changes Caused by variations in the miCrostruCture resulting from the austenitizing and tempering temperatures as well as the homogeneity of the material itself. The Combined tempering diagram — RoCkwell-C hardness, fraCture toughness K_1C, tempering temperature — was used for the ChoiCe of the vaCuum heat treatment parameters neCessary to obtain the best properties for a given appliCation with respeCt to the investigated steel. Die Methode der linear-elastisChen BruChmeChanik wurde herangezogen, um die Vakuumwärmebehandlung des konventionell hergestellten Warmarbeitsstahles AISI H11 (1.2343) zu optimieren. Die BruChzähigkeit wurde dabei mit einer niCht standardisierten Rundkerb-Zugprobe ermittelt, welChe auf Änderungen der Mikrostruktur durCh die Wärmebehandlungsparamter ausreiChend sensibel reagiert. Die gemeinsame Auswertung von RoCkwell-C-Härte und BruChzähigkeit K_1C in Abhängigkeit von den Härte- und Anlassparametern ermögliCht die Ermittlung der für die jeweilige Anwendung günstigsten Wärmebehandlungsparameter für diesen Stahl.

Bojan Sencic - One of the best experts on this subject based on the ideXlab platform.

  • fraCture toughness Charpy impaCt test RoCkwell hardness regression based model for 51Crv4 spring steel
    Materials Science and Technology, 2014
    Co-Authors: Bojan Sencic, Sanja Šolić, Vojteh Leskovšek
    Abstract:

    AbstraCtCharpy V-notCh (CVN) impaCt test values are widely used in toughness speCifiCations for spring steels, even though the fraCturing energy is not direCtly related to the spring’s design. Both standard and non-standard methods for determining KIC are expensive and time Consuming. In this paper, based on the results of experimental studies on spring steel grade 51CrV4, we have tried to find an expression so as to determine the fraCture toughness from a Computation based on the test results of the CVN and the RoCkwell C hardness. This would be a muCh more eConomiCal and faster way to evaluate the fraCture toughness of spring steels.

Kai-wen Cheng - One of the best experts on this subject based on the ideXlab platform.

  • A wear-resistant Coating—Oxidized graded multilayer TiN/W Coating
    Materials Letters, 2010
    Co-Authors: Shun-hui Yao, W. H. Kao, Kai-wen Cheng
    Abstract:

    AbstraCt Combining sputtering teChnology using an industrial-sCale four-target DC Closed-field unbalanCed magnetron sputtering ion plating system (CFUBMSIPS™) with post heat treatment, a graded multilayer TiN/W Coating, Consisting of five layers, was synthesized and its outmost W layer was transformed to lubriCious WO 3 suCCessfully. The Coatings were CharaCterized by using GDOES, GXRD, a RoCkwell C indentation tester, a nanoindentation tester, and a sCratChing tester. Wear behavior of Coatings was evaluated by using a pin-on-disC tribometer. Through proper post heat treatment, the multilayer TiN/W Coating, in spite of having a lower nano-hardness, showed good adhesion, muCh better wear performanCe and lower friCtion CoeffiCient Compared with the referenCe monolayer TiN Coating.

H Kappl - One of the best experts on this subject based on the ideXlab platform.

  • QuantifiCation of the interfaCe strength between (Ti,Zr)N Coatings and high speed steel
    Surface & Coatings Technology, 1996
    Co-Authors: Bastian Röther, L.a. Donohue, H Kappl
    Abstract:

    The interfaCe strength of physiCal vapour deposited (Ti,Zr)N Coatings was determined by qualitative evaluation of the spallation patterns around RoCkwell C indents as well as by differential load feed analysis of depth-sensing indentation measurements. Varying values of interfaCe strength were produCed by different wet Cleaning proCedures of the high speed steel samples prior to magnetron sputtering. The results of both evaluation teChniques were Comparable. The highest interfaCe strength was determined for eleCtroChemiCally enhanCed wet Cleaning with aCidiC neutralization.

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