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  • 1
    Electronic Resource
    Electronic Resource
    Study on the Microstructure and Mechanical Properties of 17-4 PH Stainless Steel Depending on Heat Treatment and Aging Time (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 118 (Dec. 2006), p. 15-20 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The microstructures and mechanical properties of 17-4 PH stainless steel at each steps ofheat treatment, such as homogenizing, solid solution treatment followed by aging treatment, longtermaging at 400 °C, and recovery treatment, in order to obtain a better understanding of theembrittlement phenomena on aging, was investigated. As the homogenizing treatment timeincreased, the length of δ-ferrite decreased and elongated shape of δ-ferrite turned to sphere shapewith the decrease of volume fraction. The solution treated specimen mainly consists of lathmartensite with a small fraction of elongated δ-ferrite. The spherical particles existed a little in themartensite matrix, while no precipitates were found in the δ-ferrite at the solution treated specimen.As the aging treatment temperature increased, the strength decreased while the toughness increased.The fcc Cu-rich particles precipitated in the δ-ferrite during the long-term aging at 400 °C after thesolution heat treatment. This precipitation causes the aged hardening after long-term agingaccompanied by decreases in elongation and charpy V-notch energy absorption. The strength andelongation was restored after recovery treatment and the fcc-Cu precipitated were almost dissolvedinto the δ-ferrite matrix
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.118.15.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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    Paper (German National Licenses)
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