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  • 1
    Electronic Resource
    Electronic Resource
    Effect of Deep Cryogenic Treatment on Carbide Precipitation and Mechanical Properties of Tool Steel (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 118 (Dec. 2006), p. 9-14 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: It is well known that the durability of tool steel could be improved by deep cryogenictreatment. It has been assumed that the increase of service life of tool steel caused by decrease ofretained austenite and/or by formation of nano-scale fine η-carbide. But the principles of deepcryogenic treatment remain unclear yet. In this research, to manifest the effect of deep cryogenictreatment on wear resistance, the specimen was emerged in liquid nitrogen for 20 hours for deepcryogenic treatment after austenitizing and the following tempering temperature was varied. Themicrostructure of specimens was observed using TEM and the mechanical properties and wearresistance were examined. As the tempering temperature increased, the carbides became larger andfine carbides were formed above certain temperature. In the case of deep cryogenic treatedspecimen, the number of carbides increased while the carbides size was decreased, furthermore, thefine carbide forming temperature was lowered also. It was considered that the deep cryogenictreatment increased the driving force for the nucleation of carbides. As tempering temperatureincreased, hardness decreased while wear resistance and impact energy increased. The deepcryogenic treated specimens showed this tendency more clearly. It was considered that the wearresistance is affected not only to the hardness but also to the precipitation of fine carbides, and thiscarbide evolution can be optimized through the deep cryogenic treatment
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.118.9.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    An Investigation of the Melt-Out and Heat Checking Phenomena in Surface Modified Hot Die Steel for Aluminum Die Casting (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 118 (Dec. 2006), p. 443-450 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: For hot die steel, failure is mostly caused by heat checking and melt-out on its surfaceswhich are in contact with molten metals. In the present research, resistances to melt-out and heatchecking of surface modified H13 hot die steels, such as gas nitriding(GN) andmicro-blasting(MB), were investigated. The evaluation of melt-out behavior was carried out bymeasuring the mean depth from the original surface after immersion. To examine the thermalfatigue resistance, a cyclic thermal shock system consisting of induction heating and water sprayquenching was constructed. The value of Lm is proposed as the index representing the susceptibilityto crack initiation and propagation. The melt-out depth was the lowest for the GN treated surface.MB-GN and MB-GN-MB treated specimens also showed good resistance to melt-out. In the case ofGN treatment, while the white layer was completely melted out, the diffusion layer still existedeven after immersion for 43 hours. This implies that nitriding significantly reduced the rate ofmelt-out. From the total crack number, it is seen that crack initiation was reduced to the extent ofhalf after surface treatment. This result means that the residual compressive stress and nitrided layerwere beneficial to crack initiation resistance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.118.443.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Surface Condition on Melt-Out of Die-Casting Mould (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 118 (Dec. 2006), p. 509-514 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: In order to understand the melt-out mechanism of H13 die casting mould material,microstructural investigation was conducted for the immersion-tested surface in Al-alloy melt. Thesurface condition of H13 tool steel was modified by varying nitriding conditions and by surfaceblasting. In particular, long-term behavior of melt-out phenomena during immersion testing of up to43 hours was focused in this article. It was observed that an ion-nitrided H13 surface showed higherresistance towards melt-out than a gas-nitrided or blasted surface. This was related to the surfacelayers that are normally formed by nitriding
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.118.509.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal Fatigue Behavior of the Surface Treated Hot Die Steel Depending on Test Temperature (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 869-872 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The influence of thermal fatigue test temperature on crack propagation behavior of the surface treated tool steel for die-casting was investigated. For this purpose, thermal fatigue system consisted of induction heating and water spray quenching unit was constructed to simulate the service condition and Lm is proposed as the index representing the susceptibility to crack initiation and propagation. The thermal fatigue tests were conducted at the maximum temperature of 600°C, 700°C and 720°C using as-heat treated or nitrided specimens. The ion nitrided specimen showed lower Lm value than as-heat treated at all test temperature. But in the case of maximum and average crack length, the ion nitrided specimen exhibited higher value than those of as-heat treated specimen
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.869.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Critical Strain for the Initiation of Dynamic Recrystallization in a Ni-Fe Base Alloy (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 577-580 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In order to quantitatively analyze the critical strain for the initiation of dynamicrecrystallization in Ni-Fe-based Alloy 718, a series of uniaxial compression tests was conducted in the temperature range 927°C - 1066°C and the strain rate range 5 x 10〈sup〉-4〈/sup〉 s〈sup〉-1〈/sup〉 - 5 s〈sup〉-1〈/sup〉 with varying initialgrain size. The critical strains were graphically determined based on one parameter approach and microscopically confirmed. The effect of γ'' (matrix-hardening phase) and δ (grain boundary phase)on the critical strain was simply discussed. The constitutive model for the critical strain of Alloy 718 was constructed using the experimental data obtained from the higher strain rate and the temperaturerange between 940°C and 1040°C
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.577.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of Surface Treatment on the Life of AISI H13 Steel Core Pin for Die-Casting (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 326-328 (Dec. 2006), p. 1181-1184 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The Effect of die surface modification on the physiochemical melt-out phenomenon wasinvestigated. To measure the melt-out resistance more accurately, the mean depth measurementmethod after immersion in molten Al-alloy was proposed instead of the conventional weight changemethod. The validity of the mean depth method was verified by the comparison with the fieldservice test of core-pin. The several kind of nitriding, such as gas nitriding, ion nitriding, salt-bathnitriding and TNHT[removed info] process of PHILOS TECHNOLOGIES, INC were employed to changesurface condition and their effects on melt out resistance were examined by the immersion test andthe field service test of core pins. The melt-out depth was decreased with the nitriding treatmentsand in case of ion-nitrided specimen showed 2.8 times lower dissolution depth than as heat treatedspecimen. The white compound layer play a important role in the prevention of physiochemicalreaction, therefore, the TNHT process, which does not form the white layer, was less effective inthe view point of melt-out phenomenon only. The field test result using core-pins for producingautomobile engine parts showed similar tendency with the mean depth method and this implies thatthe mean depth method reflects the melt-out resistance of the modified surfaces effectively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.326-328.1181.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Estimation of Micro-Formability and FEM Simulation of Micro-Forming Process of a Zr-Based Bulk Metallic Glass (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 2129-2134 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Micro-forming is considered to be a suited technology to manufacture very small metallicparts (several μm~mm). Zr-based bulk metallic glass, Zr62Cu17Ni13Al8, has been expected to be apromising metallic material for micro-forming process due to their isotropy, low flow stress in awide supercooled liquid region and good stability of amorphous matrix. Therefore, one can expectthat micro-forming of Zr62Cu17Ni13Al8 might be feasible at a relatively low stress in the supercooledliquid state without any crystallization during hot deformation. In this study, micro-formability ofZr62Cu17Ni13Al8 bulk metallic glass was investigated for micro-forging of U-shape pattern. Microformabilitywas estimated by comparing Rf values (=Af/Ag), where Ag is corss-sectional area of Ugroove, and Af the filled area by material. Micro-forging process was also simulated and analyzedby applying the finite element method. The micro-formability of Zr62Cu17Ni13Al8 was increasedwith increasing load and time in the temperature range of the supercooled liquid state. In spite of thesimilar trend in the variations of Rf values, FEM simulation results showed much higher Rf valuesthan the experimental Rf values. This disagreement was analyzed based on the stress overshootphenomena of bulk metallic glasses in the supercooled liquid region. FEM simulation of the microstampingprocess was applicable for the optimization of micro-forming process by carefullyinterpreting the simulation results
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.2129.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Deformation Behavior and Microstructure Evolutions in Ti-6Al-4V Extrusion (2003)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 426-432 (Aug. 2003), p. 719-724 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/07/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.426-432.719.pdf
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