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首页> 外文期刊>Materials Science and Engineering >Solidification microstructure and tensile deformation mechanisms of selective electron beam melted Ni_3Al-based alloy at room and elevated temperatures
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Solidification microstructure and tensile deformation mechanisms of selective electron beam melted Ni_3Al-based alloy at room and elevated temperatures

机译：选择性电子束熔化Ni_3Al基合金的凝固微观结构和拉伸变形机制在室内和升高的温度下

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摘要

Selective electron beam melting (SEBM) was used to process crack-free Ni_3Al-based IC21 alloy (low density superalloy) containing -85% γ'-volume fraction. There are distinct differences between dendrites and inter-dendritic regions with the presence of coarse γ+γ' eutectic and secondary solidification microconstituents (Cr and Mo-rich) in the latter. The pronounced inter-dendritic eutectic regions suggest that a significant elemental partitioning between the liquid and solid occurred during the SEBM. The terminal liquid is trapped at boundaries between dendrites and grains, as evidenced by the liquid films on cracked surfaces. In contrast to extensive studies indicating the segregation of Zr and B, we show unambiguously the segregation of Si to low melting point liquid films and thereby enhancing the susceptibility to solidification cracking in IC21 produced by SEBM. The tensile specimens extracted from the crack-free IC21 samples exhibit superior properties at room temperature (RT) and 1000 °C. The RT deformation mechanism is characterised by cutting y'-phase with two paired dislocations and antiphase boundaries in between. At 1000 °C tensile deformation, the well-developed γ/γ' interfacial dislocation networks are in good agreement with their promising high-temperature performance (σ_y = 518 ± 10 MPa, σ_(uts) = 560 ± 16 MPa, 20.5% for ductility).
机译：选择性电子束熔化（SEBM）用于处理含有-85％γ'体积分数的无裂缝的Ni_3Al基IC21合金（低密度超合金）。在后者在后者存在粗γ+γ'共晶和二次凝固微频率（Cr和Mo-富含），树枝状和树突间区域之间存在明显差异。明显的树突间共晶区域表明，在SEBM期间液体和固体之间的显着元素分配。端子液体被捕获在树突和晶粒之间的边界处，如裂化表面上的液体膜所证明的。与表明Zr和B的分离的广泛研究相比，我们明确地显示了Si对低熔点液膜的偏析，从而提高了SEBM生产的IC21中的凝固裂解敏感性。从无裂缝IC21中提取的拉伸试样在室温（RT）和1000℃下具有优异的性质。 RT变形机制的特征在于切割Y'-阶段，其两者之间具有两个成对的脱位和抗血腺酶边界。在1000°C的拉伸变形时，良好的γ/γ'界面位错网络与他们有前途的高温性能（σ_y= 518±10 MPa，σ_（UTS）= 560±16 MPa，20.5％延性）。

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  • 来源
    《Materials Science and Engineering》 |2021年第20期|140629.1-140629.15|共15页
  • 作者

    Y. Yao; C. Xing; H. Peng; H. Guo; B. Chen;

  • 作者单位

    School of Materials Science and Engineering Beihang University Beijing 100191 China;

    School of Materials Science and Engineering Beihang University Beijing 100191 China;

    Key Laboratory of High-Temperature Structural Materials & Coatings Technology Ministry of Industry and Information Technology Beihang University 37 XueyuanRoad Beijing 100191 China;

    Key Laboratory of High-Temperature Structural Materials & Coatings Technology Ministry of Industry and Information Technology Beihang University 37 XueyuanRoad Beijing 100191 China;

    School of Engineering University of Leicester Leicester LE1 7RH UK;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Solidification cracking; Grain boundary; Dislocation; Selective electron beam melting; Additive manufacturing; Ni-base superalloys;

    机译：凝固开裂;晶界;错位;选择性电子束熔化;添加剂制造;Ni-Base超级合金;

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