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  1. No Access

    Article

    The crystallography of bainite in a medium-carbon steel containing Si, Mn, and Mo

    A composite microstructure consisting of upper bainite laths and lower bainite plates, both carbide-free, plate (twinned) martensite, and carbon-enriched retained austenite, was produced by air-cooling a mediu...

    C. P. Luo, G. C. Weatherly, Zheng-Yi Liu in Metallurgical Transactions A (1992)

  2. No Access

    Article

    Thermal activation model of endurance limit

    A thermal activation model of the endurance limit is proposed in the present study. It can quantitatively explain the effects of temperature and frequency on the endurance limit of metals at or below room temp...

    Baotong Lü, **ulin Zheng in Metallurgical Transactions A (1992)

  3. No Access

    Article

    Hydrogen probe equipped with SrCeO3-based proton conductor and Ca/CaH2 reference electrode

    The protonic transference number of SrCe0.95Yb0.05O3-α (SCYB) ceramic pellets was determined to be above 0.9 in the temperature range of 873 to 1073 K using a hydrogen concentration cell. The density of the ceram...

    Minhui Zheng, **uxin Zhen in Metallurgical Transactions B (1993)

  4. No Access

    Article

    Formation mechanism of bainitic ferrite and carbide

    Superledges on the broad faces of bainitic ferrite plates have been observed with transmission electron microscope (TEM). The observed superledges, ranging from less than 1 to 24 nm in height, are imaged in th...

    Hong-Sheng Fang, Jia-Jun Wang… in Metallurgical and Materials Transactions A (1994)

  5. No Access

    Article

    High-temperature corrosion of Cr2O3-forming alloys in CO-CO2-N2 atmospheres

    The corrosion of Fe−28Cr, Ni−28Cr, Co−28Cr, and pure chromium in a number of gas atmospheres made up of CO−CO2(−N2) was studied at 900°C. In addition, chromium was reacted with H2−H2O−N2, and Fe−28Cr was reacted ...

    X. G. Zheng, D. J. Young in Oxidation of Metals (1994)

  6. No Access

    Article

    Fatigue crack growth of SM-1240/TIMETAL-21S metal matrix composites at elevated temperatures

    A series of high-temperature fatigue crack growth experiments was conducted on a continuous-fiberreinforced SM1240/TIMETAL-21S composite using three different temperatures, room temperature (24 °C), 500 °C, an...

    D. Zheng, H. Ghonem in Metallurgical and Materials Transactions A (1995)

  7. No Access

    Article

    Studies concerning the effect of nitrogen on the oxidation behavior of TiAl-based intermetallics at 900°C

    The oxidation behavior of the titanium aluminides Ti-50Al and Ti-48Al-5Nb has been investigated in Ar+20%O2 and in air at 900°C. Thermogravimetric studies in combination with structural analyses using optical met...

    N. Zheng, W. J. Quadakkers, A. Gil, H. Nickel in Oxidation of Metals (1995)

  8. No Access

    Article

    Formation of bainite in ferrous and nonferrous alloys through sympathetic nucleation and ledgewise growth mechanism

    The subunits constituting a bainitic sheaf in an Fe-C-Cr-Si alloy were discovered by scanning tunneling microscopy (STM) to consist of sub-subunits, and sub-subunits were also composed of sub-sub-subunits. Det...

    Hong-Sheng Fang, Jia-Jun Wang, Zhi-Gang Yang… in Metallurgical and Materials Transactions A (1996)

  9. No Access

    Article

    The effect of niobium ion implantation on the oxidation behavior of aγ-TiAl-based intermetallic

    The effect of niobium implantation (2×1016 and 1017 ions/cm2) on the oxidation behavior of a γ-TiAl-based intermetallic alloy Ti−48Al−2Cr in air at 800°C has been examined. Isothermal studies with exposure times ...

    M. F. Stroosnijder, N. Zheng, W. J. Quadakkers, R. Hofman, A. Gil… in Oxidation of Metals (1996)

  10. No Access

    Article

    General existence of ledges on α1 plates in Cu-Zn-Al alloys

    A transmission electron microscopy (TEM) study was made of the interphase boundary structure between the matrix and α1 plates formed at 250 °C, 300 °C, and 350 °C in three Cu-Zn-Al alloys. The experiments showed ...

    Chun-Ming Li, Zhi-Gang Yang, Jia-Jun Wang… in Metallurgical and Materials Transactions A (1997)

  11. No Access

    Article

    A study of the mechanism of hardness change of Al-Zn-Mg alloy during retrogression reaging treatments by small angle X-ray scattering (SAXS)

    In this work, the changes in hardness of Al-Zn-Mg alloy during retrogression and reaging (RRA) treatments were detected and the mechanism of the hardness change was studied by Small Angle X-ray Scattering (SAX...

    Chaofu Meng, Houwen Long, Yong Zheng in Metallurgical and Materials Transactions A (1997)

  12. No Access

    Chapter

    Nano-Sized Oxide Composite Powders, Bulk Materials and Superplastic Behavior at Room Temperature

    The preparation and characterization of nano-sized zirconia and its composite powders, Y-TZP/Al2O3 by various chemical processes is presented. Different ways to avoid hard-agglomerate formation and the characteri...

    D. S. Yan, J. L. Shi, Y. S. Zheng in Ceramic Microstructures (1998)

  13. No Access

    Article

    Simultaneous Aluminizing and Chromizing of Steels to Form (Fe, Cr)3Al Coatings

    A cementation pack involving halide activatorsand elemental Al and Cr powders has been used to achievethe codeposition and diffusion of aluminum and chromiuminto low-alloy steels. A two-step treatment at 925°C...

    Minhui Zheng, Robert A. Rapp in Oxidation of Metals (1998)

  14. No Access

    Article

    Cathodic deoxygenation of the alpha case on titanium and alloys in molten calcium chloride

    The oxygen-enriched alpha case on titanium and alloys was successfully deoxygenated to satisfactory levels by electrolysis in molten CaCl2, in which the cathode was made from the metal to be refined. The oxygen d...

    George Zheng Chen, Derek J. Fray… in Metallurgical and Materials Transactions B (2001)

  15. No Access

    Article

    Kinetics of In-situ formation of AlN in Al alloy melts by bubbling ammonia gas

    In-situ processing of AlN-Al alloy composites by the gas bubbling method was investigated using ammonia as the gaseous precursor in the temperature range of 1373 to 1523 K. The products were char...

    Qingjun Zheng, Ramana G. Reddy in Metallurgical and Materials Transactions B (2003)

  16. No Access

    Article

    Fine carbide-strengthened 3Cr-2WVTa bainitic steel

    Both the 3Cr-3WV and the 3Cr-2WVTa steels exhibit an acicular bainite microstructure under the normalized and the normalized-and-tempered condition. The addition of Ta to the 3Cr-3WV steel substantially decrea...

    Zheng Chen, Zhi-Wei Shan, Scott X. Mao… in Metallurgical and Materials Transactions A (2004)

  17. No Access

    Article

    Microstructure evolution and low temperature superplasticity of ZK40 magnesium alloy subjected to ECAP

    Microstructure evolution and superplastic behaviors of ZK40 magnesium alloy were investigated in the temperature range of 473–623 K. Transmission electron microscopy (TEM) was used to study the microstructure ...

    Li Lin, Zheng Liu, Lijia Chen, Teng Liu, Shiding Wu in Metals and Materials International (2004)

  18. No Access

    Article

    Modified expression for predicting the bending resistance of a locally corroded pipeline and its experimental verification

    In practical service, transmitted pipelines may suffer from corrosion, which affects the safety of the component. For an engineering pipeline subjected to local corrosion, the pipe wall becomes thinner locally...

    M. Zheng, J. B. Li, X. X. Shu in Metals and Materials International (2005)

  19. No Access

    Article

    High-temperature creep-deformation behavior of the Ni-based superalloy M963

    The high-temperature creep-deformation behavior of a Ni-based M963 superalloy has been investigated over a broad stress range of 80 to 600 MPa at high temperatures (800 °C to 975 °C). The detailed dislocation ...

    L. Z. He, Q. Zheng, X. F. Sun, H. R. Guan… in Metallurgical and Materials Transactions A (2005)

  20. No Access

    Article

    Interfacial phenomena and joint strength in resistance microwelding of crossed Au-plated Ni wires

    Resistance microwelding (RMW) of crossed Au-plated Ni wires has been performed at welding currents from 250 to 800 A and welding times from 1 to 80 ms under 4-kg welding force. The interfacial phenomena and th...

    S. Fukumoto, Zheng Chen, Y. Zhou in Metallurgical and Materials Transactions A (2005)

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