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首页> 外文期刊>Materials Science and Engineering >Effects of processing parameters on relative density, microhardness and microstructure of recycled Ti-6Al-4V from machining chips produced by equal channel angular pressing
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Effects of processing parameters on relative density, microhardness and microstructure of recycled Ti-6Al-4V from machining chips produced by equal channel angular pressing

机译：工艺参数对等通道角向压制加工切屑回收Ti-6Al-4V相对密度，显微硬度和显微组织的影响

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摘要

Ti-6A1-4V was recycled from machining chips by using equal channel angular pressing (ECAP). Samples were pressed through a die up to 8 passes at moderate temperatures in the range of 400-500 ℃. The ECAP process was accomplished with back-pressures ranging from 50 to 250 MPa. The results demonstrate that ECAP with back-pressures allows the consolidation of machining chips to near fully dense (～99.9%) recycled products. The relative density of the as-recycled samples increased with the applied back-pressure and number of passes. The average hardness and homogeneity were improved as the number of passes increased. The transmission electron microscopy reveals a combination of equiaxed and elongated a grains after the first pass. With subsequent pressing, the samples were dominated by nano-equiaxed α grains with diameters of ～70 nm. The original β phase in the machining chips was fragmented during the ECAP process.
机译：通过使用等通道角挤压（ECAP）从加工芯片中回收Ti-6A1-4V。在中等温度下（400-500℃），将样品通过模具压制最多8次。 ECAP工艺是通过50至250 MPa的背压完成的。结果表明，带背压的ECAP可使加工切屑固结成接近完全致密（〜99.9％）的再生产品。回收样品的相对密度随施加的背压和通过次数增加。随着通过次数的增加，平均硬度和均质性得到改善。透射电子显微镜显示在第一遍之后等轴晶粒和细长晶粒的组合。在随后的压制下，样品被直径约70 nm的纳米等距的α晶粒所占据。在ECAP过程中，加工芯片中的原始β相被破碎了。

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