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Effect of step quenching on microstructures and mechanical properties of HSLA steel

机译：逐步淬火对HSLA钢组织和力学性能的影响

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摘要

Step quenching and tempering (SQT) for HSLA multi-phases steel was designed to obtain the desirable multi-phases microstructure with the superior mechanical properties. Quenching and tempering (QT) and intercritical quenching and tempering (IQJ) was also conducted as controls. Besides, Effects of austenitizing temperature for the different treatment routes on microstructural characteristics and mechanical properties were also investigated. Due to the cooperation of the "soft" ferrite/pearlite and "hard" martensite, the samples undergoing SQT possess the relatively high tensile strength and impact toughness, and the lowest yield ratio. Increase of austenitizing temperature results in the coarse aus-tenite grains, and thus significantly decrease of tensile strength and impact energy, in spite of the heat treatment paths. Higher austenitizing temperature also leads to lower density of dislocations and higher grain size, which reduces the yield ratio for all samples.
机译：设计用于HSLA多相钢的步骤淬火和回火（SQT），以获得具有优异机械性能的理想多相显微组织。还进行了淬火和回火（QT）和临界淬火和回火（IQJ）。此外，还研究了不同处理途径的奥氏体化温度对组织性能和力学性能的影响。由于“软”铁素体/珠光体和“硬”马氏体的共同作用，经受SQT的样品具有相对较高的拉伸强度和冲击韧性，并且具有最低的屈服比。尽管进行了热处理，但奥氏体化温度的升高会导致奥氏体晶粒粗大，从而使拉伸强度和冲击能显着降低。较高的奥氏体化温度还导致较低的位错密度和较高的晶粒尺寸，这降低了所有样品的产率。

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  • 来源
    《Materials Science and Engineering》 |2016年第15期|371-378|共8页
  • 作者

    Yongchang Liu; Lei Shi; Chenxi Liu; Liming Yu; Zesheng Yan; Huijun Li;

  • 作者单位

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300350, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300350, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300350, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300350, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300350, PR China;

    State Key Lab of Hydraulic Engineering Simulation and Safety, School of Materials Science & Engineering, Tianjin University, Tianjin 300350, PR China;

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  • 正文语种 eng
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  • 关键词

    HSLA steel; Intercritical heat treatment; Austenitizing temperature; Microstructures; Mechanical properties;

    机译：HSLA钢;临界间热处理;奥氏体化温度;微观结构;机械性能;

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