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首页> 外文期刊>Materials Science and Engineering >High temperature deformation and control of homogeneous microstructure during hot pack rolling of Ti-44Al-5Nb-(Mo, V, B) alloys: The impact on mechanical properties
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High temperature deformation and control of homogeneous microstructure during hot pack rolling of Ti-44Al-5Nb-(Mo, V, B) alloys: The impact on mechanical properties

机译：Ti-44al-5NB-（Mo，V，B）合金热包装轧制期间均匀微观结构的高温变形及控制：对机械性能的影响

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摘要

Hot workability and deformation mechanism of beta-solidifying gamma-TiAl alloy with a nominal composition of Ti-44Al-5Nb-1Mo-2V-0.28 (in at%) were systematically studied under uniaxial hot compression. The strain rate sensitivity exponent (m) and processing maps at strains of 0.2 and 0.6 were developed. Based on an analysis of the processing maps and the corresponding microstructure, 1200 degrees C/0.1 s(-1) was defined as the optimum deformation condition. At low temperatures and high strain rates, pileup of dislocations at lamellar colonies was found to be responsible for deformation, which provided the driving force for sub-grain boundary formation. As deformation progressed, twinning-induced dynamic recrystallization (DRX) and near complete breakdown of lamellae through the rearrangement of sub-boundaries were the main deformation mechanism. Moreover, nanolamellar structure and stacking faults (SF) were generated. The hot isostatically pressed (as-HIPed) alloy had relatively good workability, and crack-free sheets were obtained from the as-HIPed alloy with different reductions. A multiple phase, homogeneous as-rolled microstructure without coarse residual lamellar colonies (RL) or shear bands was obtained when the total rolling reduction was 78.8%. The ultimate tensile stress (UTS) and ductility at 800 degrees C ranged from 523 to 553 MPa and from 21% to 32%, respectively, for different deformation reductions.
机译：在单轴热压缩下，系统地研究了具有标称组成的β固化的γ-γ-Tial合金的热可加工性和变形机制。显影应变率敏感性指数（M）和0.2和0.6株的处理地图。基于处理地图和相应的微结构的分析，将1200摄氏度（-1）定义为最佳变形条件。在低温和高应变速率下，发现层状菌落的脱位堆积负责变形，其提供了亚晶边界的驱动力。随着变形的进展，通过副边界重排的孪晶诱导的动态重结晶（DRX）和LAMELLAE的完全分解是主要变形机制。此外，产生了纳米米兰结构和堆叠故障（SF）。热等静压（以upped）合金具有相对良好的可加工性，并且可以从备p合金中获得无裂缝片，以不同的降低。当总轧制还原为78.8％时，获得了无粗残留层状菌落（R1）或剪切带的多相，均匀的片状微观结构。对于不同的变形减少，800摄氏度的最终拉伸应力（UTS）和延展性分别为523至553MPa，分别为21％至32％。

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  • 来源
    《Materials Science and Engineering》 |2019年第28期|1-9|共9页
  • 作者

    Li T. R.; Liu G. H.; Xu M.; Wang B. X.; Misra R. D. K.; Wang Z. D.;

  • 作者单位

    Northeastern Univ State Key Lab Rolling & Automat Shenyang 110819 Liaoning Peoples R China;

    Northeastern Univ State Key Lab Rolling & Automat Shenyang 110819 Liaoning Peoples R China;

    Northeastern Univ State Key Lab Rolling & Automat Shenyang 110819 Liaoning Peoples R China;

    Northeastern Univ State Key Lab Rolling & Automat Shenyang 110819 Liaoning Peoples R China|Univ Texas El Paso Dept Met Mat & Biomed Engn Lab Excellence Adv Steel Res El Paso TX 79968 USA;

    Univ Texas El Paso Dept Met Mat & Biomed Engn Lab Excellence Adv Steel Res El Paso TX 79968 USA;

    Northeastern Univ State Key Lab Rolling & Automat Shenyang 110819 Liaoning Peoples R China;

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  • 正文语种 eng
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  • 关键词

    TiAl; Microstructure; Deformation mechanism; Hot rolling;

    机译：TiAl;微观结构;变形机制;热轧;

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