Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Electronic Resource  (13)
Source
Material
  • Electronic Resource  (13)
Years
  • 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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    An Evaluation of Thermal Fatigue Cracking and Chemical Reaction in Die Casting Mould (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 701-704 
    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: It is well known that the main failure mechanisms in die-casting mould are heat checkingdue to thermal fatigue and melt-out caused by chemical reaction between die and molten alloys.Thermal fatigue tests were carried out using the thermal cycle simulator to establish the propermethod to estimate the thermal fatigue resistance of hot die steel. In this study, the thermal shocktester consisted of induction heating and water spray cooling unit was constructed to evaluatethermal crack propagation resistance and the sum of crack length per unit specimen length, Lm isproposed as the index representing the susceptibility to crack initiation and propagation. Also, newconcept of measurement for the melt-out behavior was suggested. AISI H13 hot work tool steel wassolution treated and tempered at various temperatures, to control the hardness and toughness thathave effect on the behavior of thermal crack propagation. The result of thermal fatigue test showedthat there is optimum value of hardness and impact energy to maximize the thermal crackpropagation resistance. The influence of nitriding on melt-out resistance was also investigated. Thedissolution rate due to melt-out phenomenon tended to be smaller for thicker compound layer.Furthermore, the resistance to melt-out was affected by the compound layer thickness rather thanthat of diffusion layer. The results of the both tests properly reflect the effect of materials propertieson failure modes of die-casting mould and it means those test methods are suitable to evaluate thedurability of hot work tool steel for die-casting
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.701.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Thermal Crack Propagation Behavior on Nitrided H13 Hot Work Die Steel (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 1191-1194 
    Details
    ISSN: 1662-8985
    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 nitriding type and condition on the thermal crack propagation behaviorof hot work die steel was investigated. Thermal fatigue tests were carried out using a specialapparatus, which is consisted of induction heating and water spray cooling unit. The sum of cracklength per unit specimen length, Lm is proposed as an index representing the susceptibility to crackpropagation. The Lm values of the gas and ion nitrided specimens were lower than that of as-heattreated specimen. But in the case of maximum and average crack length of nitrided specimen washigher than those of as-heat treated specimen. The nitrogen diffusion layer still remained althoughthe oxide scale was formed and fell off during thermal fatigue test. After 1000 cycles of the thermalfatigue test, the interior region of nitrided specimen showed lower hardness by softening. Inparticular, ion nitrided specimens of relatively less softening condition showed reduction both thedepth and number of cracks compared with the other surface conditions
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.1191.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Preparation and Characterization of CdSe Nanoparticles Prepared by Using Ultrasonic Irradiation (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 2034-2036 
    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: CdSe nanoparticles with average particles size of ~ 3.4 nm were successfully prepared by thesonochemical reduction of a mixed solution of CdCl2, Na2SeSO3 and CH2CH2OH)2NH at room temperature.CdSe nanoparticles characterized by TEM, XPS and XRD analysis revealed the formation of highpurity cubic phase CdSe nanoparticles with lattice constant of a=6.415Å. CdSe nanoparticles showedrelatively large range of particle size distribution from 20 to 50 nm as the sonication time increased.UV-Vis absorption spectra showed a red-shift in the wavelength region of 545-590 nm as increasingsonication time due to the gradual growth of CdSe nanoparticles in the solution. This paper will mainlypresent the effects of ultrasonic irradiation on the formation and properties of CdSe nanoparticles
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2034.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Preparation and Characterization of CdSe Synthesized from Non-Aqueous Media (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 2030-2033 
    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: Cadmium selenide (CdSe) have been prepared by the reduction of mixed solution of cadmiumchloride (CdCl2), sodium selenosulfate (Na2SeSO3) and diethanolamine ((CH2CH2OH)2NH) at temperaturesof 80-200°C under Ar atmosphere. Characteristics of CdSe nanoparticles were analyzed usingtransmission electron microscopy (TEM), x-ray photoelectron spectroscopy (XPS) and x-ray diffraction(XRD) and UV-Vis absorption spectra. CdSe samples prepared at relatively low temperature of below100°C showed cubic structure while samples synthesized at temperature above 100°C showed hexagonalphase. The increased reaction temperature caused the particle size increase as well as the agglomerationof particles to form a hollow sphere. UV-Vis absorption spectra also showed a red-shift as increasingreaction temperatures due to the gradual growth of CdSe nanoparticles in the solution. The relativelysharp absorption band from samples synthesized at 80 and 100°C can be attributed to homogeneousparticle size distribution compared with those of prepared at elevated temperatures. This paper willmainly discuss the phase stability of CdSe nanoparticles as well as the hollow sphere formation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.2030.pdf
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...