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通过还原-磨选法制取的特种天然微合金铁粉具有优异的性能。为了提高铁粉的压缩性,研究了不同退火温度对微合金铁粉压缩性的影响。采用扫描电镜、X射线衍射和硬度测试,探讨了晶粒大小、显微硬度对微合金铁粉压缩性的影响。结果表明:不同温度退火后粉末形貌、松装密度和流动性变化不大;但退火温度对微合金铁粉的晶粒尺寸、显微硬度影响较大,进而影响压缩性。随着退火温度的升高,粉末的晶粒尺寸增大,显微硬度降低。粉末的压缩性随着晶粒尺寸的增加有所提升;同等压力下压缩性随着显微硬度的降低而提高。压力为500MPa时,显微硬度对粉末压缩性的影响最大。
The special natural microalloyed iron powder prepared by reduction-grinding method has excellent performance. In order to improve the compressibility of iron powder, the influence of different annealing temperature on the compressibility of the microalloyed iron powder was studied. The effects of grain size and microhardness on the compressibility of microalloyed iron powder were investigated by scanning electron microscopy, X-ray diffraction and hardness testing. The results show that the morphology, bulk density and fluidity of the powder after annealing at different temperatures have little change. But the annealing temperature has a great effect on the grain size and microhardness of the microalloyed iron powder, which affects the compressibility. With the increase of annealing temperature, the grain size of the powder increases and the microhardness decreases. The compressibility of the powder increases with the increase of the grain size; compressibility increases with the decrease of the microhardness under the same pressure. The pressure of 500MPa, the microhardness of powder compressibility of the greatest impact.