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  1. Article

    Open Access

    High-resolution Transmission Electron Microscopy Characterization of the Structure of Cu Precipitate in a Thermal-aged Multicomponent Steel

    High-dispersed nanoscale Cu precipitates often contribute to extremely high strength due to precipitation hardening, and whereas usually lead to degraded toughness for especially ferritic steels. Hence, it is ...

    Lizhan Han, Qingdong Liu, Jianfeng Gu in Chinese Journal of Mechanical Engineering (2019)

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  2. No Access

    Article

    The effect of preexisting VC carbides on the bainite transformation in medium-carbon high-alloy steel

    Bainite transformation in steels is influenced by various factors. In the present work, bainite transformation in medium carbon high alloyed steel was investigated focusing on the influence of preexisting VC c...

    **aoli Zhao, Lizhan Han, Chuanwei Li, Jianfeng Gu in Journal of Materials Research (2019)

  3. No Access

    Article

    A Novel Method to Calculate the Carbides Fraction from Dilatometric Measurements During Cooling in Hot-Work Tool Steel

    Dilatometry is a useful technique to obtain experimental data concerning transformation. In this paper, a dilation conversional model was established to calculate carbides fraction in AISI H13 hot-work tool st...

    **aoli Zhao, Chuanwei Li, Lizhan Han, Jianfeng Gu in Metals and Materials International (2018)

  4. Article

    Open Access

    Bainite Transformation Characteristics of High-Si Hypereutectoid Bearing Steel

    In this work, the bainite transformation characteristics of a high-Si hypereutectoid (1.3 wt.% Si, 1 wt.% C) bearing steel was analyzed by means of microstructural observation and dilatometric experiment. The ...

    Zhihui Chen, Jianfeng Gu, Lizhan Han in Metallography, Microstructure, and Analysis (2018)

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  5. No Access

    Article

    Effect of Macrosegregation on the Microstructure and Mechanical Properties of a Pressure-Vessel Steel

    Macrosegregation refers to the chemical segregation, which occurs quite commonly in the large forgings such as nuclear reactor pressure vessel. This work assesses the effect of macrosegregation and homogenizat...

    Guanghua Yan, Lizhan Han, Chuanwei Li… in Metallurgical and Materials Transactions A (2017)

  6. No Access

    Chapter

    Microstructure Evolution of a Reactor Pressure Vessel Steel During High-Temperature Tempering

    The electron microscopy techniques were employed to analyze the microstructure evolution during high-temperature tempering of a reactor pressure vessel steel. The results show that carbon enriched martensite/a...

    Chuanwei Li, Jianfeng Gu, Lizhan Han, Qingdong Liu in Energy Materials 2017 (2017)

  7. No Access

    Article

    Microstructural Evolution and Carbide Precipitation in a Heat-Treated H13 Hot Work Mold Steel

    The microstructure and carbide precipitation for a H13 hot work mold steel after heat treatment and stabilization treatment at 620 °C for up to 20 h were investigated by optical microscopy, electron backscatte...

    Mu Lin, **ngfeng Zhao, Lizhan Han… in Metallography, Microstructure, and Analysis (2016)

  8. No Access

    Article

    Effect of interstitial solutes on precipitation behavior of 9–12% chromium ferritic steels

    Effects of nitrogen and carbon content on precipitation behavior in two 9–12% Cr ferritic heat-resistant steels during isothermal transformation were investigated. Isothermal aging treatments at 700 °C after s...

    **ngang Tao, Chuanwei Li, Lizhan Han, Jianfeng Gu in Metals and Materials International (2015)