Microstructural and mechanical characterization of injection molded 718 superalloy powders
Microstructural and mechanical characterization of injection molded 718 superalloy powders
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DOI：
10.1016/j.jallcom.2013.04.042
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发表时间：
2013-11
影响因子：
6.2
通讯作者：
Ö. Özgün;H. Gülsoy;R. Yilmaz;F. Findik
中科院分区：
文献类型：
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作者：
Ö. Özgün;H. Gülsoy;R. Yilmaz;F. Findik
本文研究了718高温合金注射成形零件的最佳工艺参数。同时对所制备的零件进行了显微组织和力学性能表征。在初始阶段，将718高温合金粉末与多组分粘结剂系统混合以制备原料。然后将制备的原料造粒并通过注射成型。在该操作之后，使成形的样品经受脱脂过程。这些样品在不同温度下烧结不同时间。对在最高相对密度（1290 °C下3 h）条件下烧结的样品分别进行固溶处理和老化。烧结，溶液处理和老化的样品分别进行微观结构和机械特性。X射线衍射、光学显微镜（OM）、扫描电镜（SEM）、透射电镜（TEM）和元素分析等微观结构表征表明，使用聚合物粘结剂体系导致注射成型样品中出现大量碳化物析出物。时效处理使合金中大量碳化物析出，降低了合金中γ′和γ″相的体积分数。通过硬度测量和拉伸试验进行机械表征。
This study concerns with the determination of optimum production parameters for injection molding 718 superalloy parts. And at the same time, microstructural and mechanical characterization of these produced parts was also carried out. At the initial stage, 718 superalloy powders were mixed with a multi-component binder system for preparing feedstock. Then the prepared feedstock was granulated and shaped by injection molding. Following this operation, the shaped samples were subjected to the debinding process. These samples were sintered at different temperatures for various times. Samples sintered under the condition that gave way to the highest relative density (3 h at 1290 °C) were solution treated and aged respectively. Sintered, solution treated and aged samples were separately subjected to microstructural and mechanical characterization. Microstructural characterization operations such as X-ray diffraction, optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and elemental analysis showed that using polymeric binder system led to plentiful carbide precipitates to be occurred in the injection molded samples. It is also observed that the volume fractions of the intermetallic phases (γ′ and γ″) obtained by aging treatment were decreased due to the plentiful carbide precipitation in the samples. Mechanical characterization was performed by hardness measurements and tensile tests.