Microstructure and Properties of Alumina Ceramic Particle Reinforced Powder Forged Fe-Ni-Mo-C-Cu Composites
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摘要: 本文通过粉末锻造技术制备了不同含量微米级Al2O3颗粒强化的Fe-Ni-Mo-C-Cu(简称Q61)复合材料,并对调质态和淬火态复合材料的组织和性能进行了研究。结果表明:当Al2O3添加量为0.15 wt.%时,其在基体内分布均匀,相较于单一Q61,调质态复合材料的硬度从HRC 38增至HRC 39.8,屈服强度从1106 MPa增至1121 MPa,延伸率从12%降至6.5%,而淬火态复合材料的硬度则从HRC 61.5增至HRC 63.2,磨损率从5.27×10-6 mm3·m-1·N-1降至3.08×10-6 mm3·m-1·N-1,低于对比试验用的典型齿轮材料40Cr的3.24×10-6 mm3·m-1·N-1;当Al2O3含量大于0.15 wt.%时其逐渐偏聚,虽然调质态下复合材料屈服强度仍继续小幅增加,但塑性严重退化,且淬火态复合材料磨损率增加、耐磨性变差。综合来看,本文制备的Q61+0.15 wt.% Al2O3复合材料在调质态下具有较高的综合力学性能而在淬火态下则表现出良好的抗摩擦磨损能力,相关结果可为粉末锻造制备该系列材料的组织性能调控和工业化生产提供有益参考
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关键词:
Abstract: The Fe-Ni-Mo-C-Cu (Q61) composite materials reinforced by different contents of microscaled alumina particles were prepared by powder forging and the microstructures and properties of the composites in the quenched and tempered states were investigated. The Al2O3 particles were distributed homogeneously in the matrix when its amount is 0.15 wt.%. Resultantly, the hardness and yield strength of the tempered composite were increased from HRC 38 and 1106 MPa to HRC 39.8 and 1121 MPa, respectively, while the elongation was decreased from 12% to 6.5%, all in comparison with the single Q61 under the same state. Correspondingly after quenching, the hardness was enhanced from HRC 61.5 to HRC 63.2 and the wear rate was reduced from 5.27×10-6 mm3·m-1·N-1 to 3.08×10-6 mm3·m-1·N-1, lower than that of the typical gear material 40Cr (3.24×10-6 mm3·m-1·N-1). However, the alumina was aggregated gradually to a great extent when the addition content was further improved. Though the yield strength is still improved, the plasticity is reduced significantly for the tempered materials, and the wear rate was greatly increased for the quenched counterparts, showing degraded wear resistance. Overall, the composite with 0.15 wt. % alumina can achieve a better combination of comprehensive mechanical properties and good wear resistance in the tempered and quenched states, respectively. This work can provide useful guidance for the microstructure and property manipulation and the industrial applications for this series of materials prepared by powder forging.-
Key words:
- Powder forging /
- Composite materials /
- Microstructure /
- Mechanical property /
- Friction and wear
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