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  • Trans Tech Publications, Ltd.  (13)
  • Xu, Wen Yong  (13)
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  • Trans Tech Publications, Ltd.  (13)
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  • 1
    Online Resource
    Online Resource
    Microstructure and Mechanical Properties of In718 Alloy Produced with Twin-Scanning Atomizer
    Trans Tech Publications, Ltd. ; 2007
    In:  Materials Science Forum Vol. 561-565 ( 2007-10), p. 415-418
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 561-565 ( 2007-10), p. 415-418
    Abstract: Sound billets were produced at BIAM with a twin-scanning spray forming facility. Microstructure and mechanical properties of In718 alloy produced with this technology were examined. Both tensile strength and stress rupture properties are excellent with the rupture life even doubled after received a direct aging heat treatment.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.561-565
    DOI: 10.4028/www.scientific.net/MSF.561-565.415
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2007
    detail.hit.zdb_id: 2047372-2
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  • 2
    Online Resource
    Online Resource
    Surface Segregation and Oxidation Behavior of Superalloy Powders Fabricated by Argon Atomization
    Trans Tech Publications, Ltd. ; 2013
    In:  Materials Science Forum Vol. 747-748 ( 2013-2), p. 518-525
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 747-748 ( 2013-2), p. 518-525
    Abstract: Particle surface component and valence state of nickel-based superalloy FGH96 powders fabricated by argon gas atomization have been measured by X-ray phoelectron spectrometer (XPS) to recognize the effect of powder size, surface segregation and heat treating on the oxidation behavior of powders. Type and phase structure of prior particle boundaries (PPBs) precipitated in HIPed superalloy have been studied also. The results showed that prior particle surface segregation and oxidation happened during the powder collection and storage with the C, O, Ti elements enrichment and Ti, Cr, Al, Zr elements oxidation in the surface respectively. During the heat treating of 1150/2h, normal segregation element Ti and Zr enriched more apparently in the particle surface, on the contrary, negative segregation elements Ni, Al and Co diffused into the particle inner. Furthermore, the higher oxygen level on particle surface enhanced to form much more oxides such as ZrO 2 , TiO 2 and Cr 2 O 3 . During HIP process of 1150/2h/150MPa, the oxide ZrO 2 as the nuclei accelerated the preferential precipitation of MC-type carbides which forms the continuous harmful PPBs. Definitely, PPB precipitation depended on the prior particle surface segregation and oxidation, surface elements Ti, Cr and Nb enrichment and oxidation reaction enhancement in high temperature such as 1150. Small powders always had little segregation in the surface and thin oxidation layer, but had more oxygen content per weight for its higher specific surface. So using some powders with optimum particle size and lower oxygen content can help to reduce the PPB precipitation.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.747-748
    DOI: 10.4028/www.scientific.net/MSF.747-748.518
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
    detail.hit.zdb_id: 2047372-2
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  • 3
    Online Resource
    Online Resource
    Powder Metallurgical Processing of Ti6Al4V Alloy
    Trans Tech Publications, Ltd. ; 2011
    In:  Advanced Materials Research Vol. 217-218 ( 2011-3), p. 1336-1342
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 217-218 ( 2011-3), p. 1336-1342
    Abstract: Ti6Al4V powders were produced by Argon gas atomization, the powder fraction ＜ 250μm was hot isostatically pressed (HIP) at 920°C and 140MPa. The properties of pre-alloyed powders and the compact were investigated in this paper. Powder particles are almost perfectly spherical. The microstructure of powder surface is approximate hexagonal cellular structure, the inner structure exhibits cellular αphase and needle-like martensiteα′ phase, these are resulting from the rapid solidification. After HIP, Ti6Al4V alloy has a Widmanstaten microstructure consisting of continuous grain boundary α（GBα）phase and β transformation structure, the grain size of GBα phase is in the range of 5～15μm . The tensile test at room temperature shows that strength of samples is 880MPa, the fracture surface exhibits obvious brittle cleavage fracture features including cleavage facets with river pattern and a few elongate dimples of different sizes and big voids at localized area.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.217-218
    DOI: 10.4028/www.scientific.net/AMR.217-218.1336
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2011
    detail.hit.zdb_id: 2265002-7
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  • 4
    Online Resource
    Online Resource
    Effect of Particle Size and Shape on Flowability of FGH96 Superalloy Powder
    Trans Tech Publications, Ltd. ; 2021
    In:  Materials Science Forum Vol. 1035 ( 2021-06-22), p. 143-151
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 1035 ( 2021-06-22), p. 143-151
    Abstract: The effect of particle size and shape on flowability of FGH96 superalloy powder was investigated by field emission scanning electron microscopy (FE-SEM), laser particle size analyzer (LPSA) and X-ray photoelectron spectroscopy (XPS). The results showed that the powder flowability basically presented a decreasing trend as the median diameter decreased. The Hall velocity of the five median diameter powders ( 50 =203.9 μm, 106.3 μm, 83.2 μm, 73.8 μm, 19.9 μm) was 27.18 s/50g, 23.25 s/50g, 23.86 s/50g, 23.42 s/50g and none, respectively. The surface oxides/ hydroxide/nitride of the five median diameter powders were mostly the same, mainly including Al 2 O 3 , Cr 2 O 3 , MoO 3 , Nb 2 O 5 , Ni (OH) 2 , TiO 2 and TiN. The median diameter 50 , shape factors (circularity, aspect ratio, roundness, solidity) and fractal dimension were selected to quantitatively characterize particle size and shape. For the same fluctuation value of powder flowability, the roundness and solidity showed lower sensitivity. Compared with the two shape factors, the sensitivity of circularity and aspect ratio was at an intermediate level, while the median diameter and fractal dimension displayed higher sensitivity. The median diameter and fractal dimension can be used to characterize the principal variation of flowability. The circularity and aspect ratio can be utilized to characterize the variation of flowability supplementally.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.1035
    DOI: 10.4028/www.scientific.net/MSF.1035.143
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2021
    detail.hit.zdb_id: 2047372-2
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  • 5
    Online Resource
    Online Resource
    Interface between FGH96 Superalloy and Refractory Slurry with Different Soaking Time
    Trans Tech Publications, Ltd. ; 2021
    In:  Materials Science Forum Vol. 1035 ( 2021-06-22), p. 318-327
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 1035 ( 2021-06-22), p. 318-327
    Abstract: In this paper, the contact interface between FGH96 superalloy melts and refractory slurry with corundum powder and silica sol at 1600°C with different soaking time in 10-240 min range was investigated. The morphology and composition of the contact interface were studied by optical microscopy (OM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that the reaction layer formed on the contact interface between the melting superalloy and the refractory slurry, and is mainly consist of Alumina and contains a small amount of other metal elements such as Ti and Cr. The reaction layer was not smooth on the micro level, and there was a peninsula-like structure protruding into the internal part of the melting superalloy on the reaction zone, and even started to fall off at some places to form islands. With the increase of soaking time, the reaction between melt of superalloy and refractory slurry increased gradually and the reaction layer began to combine with the refractory slurry substrate and form obvious interaction layered structure, resulting in the corrosion of refractory slurry substrate. With the soaking time over 120 min, the stable contact interface was destroyed. Thermodynamic calculation shows that the substitution reaction between Al in superalloy and SiO 2 in refractory slurry meets the thermodynamic conditions, and the reaction can proceed forward.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.1035
    DOI: 10.4028/www.scientific.net/MSF.1035.318
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2021
    detail.hit.zdb_id: 2047372-2
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  • 6
    Online Resource
    Online Resource
    Quantitative Analysis on Fatigue Fracture of Spray Formed GH738 Alloy
    Trans Tech Publications, Ltd. ; 2013
    In:  Materials Science Forum Vol. 747-748 ( 2013-2), p. 564-568
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 747-748 ( 2013-2), p. 564-568
    Abstract: Low-cycle fatigue (LCF) fracture of the spray formed GH738 alloy was investigated under total strain controlled mode at 650°C. Basic theory for evaluating fatigue lives by fatigue striations has been introduced. The crack length a and the crack propagation rate da/dN were measured and the curve of da/dN in crack propagation zone was obtained with Paris formula and tabulation trapezoidal formula, respectively. The size and symmetry of rapid fracture zone of fatigue were also studied. The results showed that the relationship of a and N was linear with tabulation trapezoidal formula, and the da/dN and a was conic with Paris formula. At last, quantitative analysis of fatigue fracture was also discussed.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.747-748
    DOI: 10.4028/www.scientific.net/MSF.747-748.564
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
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  • 7
    Online Resource
    Online Resource
    Effect of Heat Treatment on the Microstructure and Property of TiAl Alloys Prepared by Gas Atomization Powders
    Trans Tech Publications, Ltd. ; 2013
    In:  Materials Science Forum Vol. 747-748 ( 2013-2), p. 497-501
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 747-748 ( 2013-2), p. 497-501
    Abstract: Powder metallurgical TiAl alloy was fabricated by gas atomization powders, and the effect of heat treatment temperature on the microstructure evolution and room tensile properties of PM TiAl alloy was investigated. The uniform fine duplex microstructure was formed in PM TiAl based alloy after being heat treated at 1250/2h followed by furnace cooling (FC)+ 900/6h (FC). When the first step heat treatment temperature was improved to 1360/1h, the near lamellar microstructure was achieved. The ductility of the alloy after heat treatment improved markedly to 1.2% and 0.6%, but the tensile strength decreased to 570MPa and 600MPa compared to 655MPa of as-HIP TiAl alloy. Post heat treatment at the higher temperature in the alpha plus gamma field would regenerate thermally induced porosity (TIP).
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.747-748
    DOI: 10.4028/www.scientific.net/MSF.747-748.497
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
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  • 8
    Online Resource
    Online Resource
    Low Cycle Fatigue Behavior of Spray Formed Superalloy Rings
    Trans Tech Publications, Ltd. ; 2011
    In:  Advanced Materials Research Vol. 399-401 ( 2011-11), p. 1937-1941
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 399-401 ( 2011-11), p. 1937-1941
    Abstract: Low cycle fatigue behavior of spray formed superalloy GH738 at 650°C has been investigated under fully reversed total strain-controlled mode. When strain amplitude (Δε t /2) is between 0.32% and 0.4%, cyclic stress response is stable under fully reversed constant total strain amplitude. The stabilized hysteresis loops narrowing sharply to a straight line indicates that the alloy exhibits typical elastic strain. The crack initiates single site from the surface. When strain amplitude is between 0.6% and 1.0%, cyclic hardening is observed until fracture. The tendency for hardening is found to increase with strain amplitude. The hyperesis loops expand gradually, which indicates that plastic deformation happens during cyclic deformation process. The crack initiates multi-sites from the surface. The cyclic strain-stress relationship of spray formed GH738 at 650°C can be illustrated by Δσ/2 =2017(Δε p /2)0.1489.The total strain-life function can expressed by Δε t /2=0.0071(2N f ) -0.0781 +0.0647(2N f ) ) -0.4914 .
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.399-401
    DOI: 10.4028/www.scientific.net/AMR.399-401.1937
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2011
    detail.hit.zdb_id: 2265002-7
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  • 9
    Online Resource
    Online Resource
    Modeling of Flow Fields of Different Delivery Chamfers in Spray Forming Process
    Trans Tech Publications, Ltd. ; 2014
    In:  Materials Science Forum Vol. 789 ( 2014-4), p. 554-559
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 789 ( 2014-4), p. 554-559
    Abstract: The computational fluid dynamic (CFD) software was used to calculate the velocity field in atomization chamber of spray forming equipment. The relationship between melt flow rates, gas aspiration of the atomizer and operating pressure are complex, and the above mentioned parameters are closely related to the atomization process. The influences of different delivery chamfers on gas flow field, which is determined by atomizer structure, were analyzed. Using K-epsilon model with a symmetrical domain, the gas dynamic of different delivery chamfer conditions were investigated. The results indicate that the sharp point of delivery tube causes detachment of flow field, and 56°, 45° and 34° chamfer conditions have same diffusion angle. Gas was aspirated from delivery tube when chamfer was 0°, which is beneficial to liquid metal flow in atomization process.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.789
    DOI: 10.4028/www.scientific.net/MSF.789.554
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
    detail.hit.zdb_id: 2047372-2
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  • 10
    Online Resource
    Online Resource
    Evaluation of Inclusions in P/M Superalloy
    Trans Tech Publications, Ltd. ; 2013
    In:  Materials Science Forum Vol. 747-748 ( 2013-2), p. 513-517
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 747-748 ( 2013-2), p. 513-517
    Abstract: The non-metallic inclusions in master alloy, P/M superalloy and HIP powder billet were studied in this paper. The results show that the amount of inclusions in master alloy is higher than that of the superalloy powers. The EB-button analysis shows that the main non-metallic inclusions in both the master alloy and the HIP powder billet is Al 2 O 3 .The amount of the inclusion in master alloy is about 0.166cm 2 /kg and the size of most inclusions is in the range of 100μm to 200μm, while the maximum inclusion size reaches 400μm.In the P/M superalloy billet, the content of inclusion is only 0.01cm 2 /kg and the size of most inclusions is less than 50 μm.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.747-748
    DOI: 10.4028/www.scientific.net/MSF.747-748.513
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2013
    detail.hit.zdb_id: 2047372-2
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