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首页> 外文期刊>Journal of Materials Science Research >Effects of Graphite Content and Temperature on Microstructure and Mechanical Properties of Iron-Based Powder Metallurgy Parts
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Effects of Graphite Content and Temperature on Microstructure and Mechanical Properties of Iron-Based Powder Metallurgy Parts

机译：石墨含量和温度对铁基粉末冶金零件组织和力学性能的影响

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摘要

An experimental investigation was conducted to study the effects of graphite content and temperature on the microstructure and mechanical properties of iron-based powder metallurgy parts. The specimens were produced at two sintering temperatures, 600 °C and 1100 °C, respectively, and the graphite contents were 0.5%, 1%, 1.5% and 2%, respectively. The polished and etched specimens were examined by optical metallography (OM) and scanning electron microscopy (SEM). Brinell hardness of the sintered specimen was measured to evaluate the mechanical behavior, and the density and the porosity of the specimens were calculated to evaluate the compaction and sintering. The results show that: (1) as the graphite content increasing from 0.5% to 2%, the microstructure of the iron-based powder sintered specimen changes gradually from ferrite and a small amount of pearlite to pearlite and a small amount of ferrite, (2) with the sintering temperature increasing, the microstructure of the sintered interface becomes uniform, (3) with the graphite content increasing, the hardness of the iron-based powder sintered part grows obviously and (4) the densities of the specimens with different graphite contents at 1100 °C are higher than those at 600 °C, and with graphite content increasing, the porosity of the sintered specimen decreases.
机译：进行了实验研究，以研究石墨含量和温度对铁基粉末冶金零件的组织和力学性能的影响。样品是在两个烧结温度分别为600°C和1100°C下生产的，石墨含量分别为0.5％，1％，1.5％和2％。通过光学金相学（OM）和扫描电子显微镜（SEM）检查抛光和蚀刻的样品。测量烧结样品的布氏硬度以评价其机械性能，并计算样品的密度和孔隙率以评价压实和烧结。结果表明：（1）随着石墨含量从0.5％增加到2％，铁基粉末烧结试样的微观结构从铁素体和少量珠光体逐渐变为珠光体和少量铁素体，（ 2）随着烧结温度的升高，烧结界面的微观结构趋于均匀;（3）随着石墨含量的增加，铁基粉末烧结件的硬度明显增加;（4）不同石墨试样的密度1100℃时的含量高于600℃时的含量，并且随着石墨含量的增加，烧结试样的孔隙率降低。

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