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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Microstructural and mechanical characterization of iron samples sintered in DC plasma
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Microstructural and mechanical characterization of iron samples sintered in DC plasma

机译：直流等离子体中烧结铁样品的组织和力学性能

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Samples of unalloyed iron were sintered in an abnormal glow discharge using a confined anode-cathode configuration. In this geometry the samples were placed on the holder, which acted as the discharge anode, while the cathode surrounded the sample undergoing bombardment by ions and energetic neutral atoms/molecules, leading to heating and sputtering. For comparison, another set of samples was sintered in a resistive furnace. The presence of large grains was observed for plasma-sintered unalloyed iron, which could be attributed to a large amount of atomic hydrogen in the electric discharge. These grains influence the mechanical properties of the sintered product. Three-point bending tests revealed lower yield strength and, quite surprisingly, ductility, compared to samples sintered in a furnace under the same temperature and time conditions. The decrease in ductility is associated with intergranular crack propagation in plasma-sintered samples. Such embrittlement could be attributed to the absorption of hydrogen during plasma sintering or higher impurity content at grain boundaries.
机译：使用受限的阳极-阴极结构以异常辉光放电烧结未合金化的铁样品。在这种几何形状中，将样品放置在用作放电阳极的支架上，而阴极则围绕着样品，使其受到离子和高能中性原子/分子的轰击，从而导致加热和溅射。为了比较，将另一组样品在电阻炉中烧结。等离子体烧结的非合金铁中观察到大晶粒的存在，这可能归因于放电中大量的原子氢。这些晶粒影响烧结产品的机械性能。与在相同温度和时间条件下在炉中烧结的样品相比，三点弯曲试验显示出较低的屈服强度和延展性，这令人惊讶。延展性的降低与等离子烧结样品中的晶间裂纹扩展有关。这种脆化可归因于等离子体烧结过程中氢的吸收或晶界处较高的杂质含量。

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