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首页> 外文期刊>Materials Science and Engineering >The role of pore wall microstructure and micropores on the mechanical properties of Cu-Ni-Mo based steel foams
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The role of pore wall microstructure and micropores on the mechanical properties of Cu-Ni-Mo based steel foams

机译：孔壁微结构和微孔对Cu-Ni-Mo基泡沫钢力学性能的影响

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Mechanical behaviour of metal foams is not only affected by the macrostructure of the foam, i.e. porosity content, shape and size of the macropores, but also depends on the properties of pore wall. This study primarily concerns the role of pore wall microstructure and micropores formed in the pore wall which influences the mechanical behavior of steel foams. Steel foams having rather similar macropore structure but differences in pore wall microstructure and porosity content were produced by the space holder-water leaching technique in powder metallurgy. Pre-alloyed steel powders with compositions of 1.75 Ni-1.5 Cu-0.5 Mo-0.2 C, 4.0 Ni-1.5 Cu-0.5 Mo-0.2 C and 1.5 Mo-0.2 C as the parent material and carbamide as space holder material were used for the produced steel foams. The structural and mechanical property variations resulting from the use of spacer having different amounts and the various alloy elements in the chemical composition of powders were investigated. The formation mechanism of macro and micropores was discussed in terms of mechanical properties of the foams. The results showed that the size and amount of macropores increased with increasing spacer content, but the size and amount of micropores decreased. An increase in content of spacer improved the densification during compaction of powder mixtures by the plastic deformation of soft spacer particles. In addition, the copper in alloys reduced micropores in the pore walls. Compression tests were carried out to investigate the deformation mechanism and energy absorbing characteristic of the steel foams. The alloy that contained high nickel resulted in better compressive behavior. The strength and energy absorption capacity of the foams increased with a decrease in level of porosity.
机译：金属泡沫的机械行为不仅受泡沫的宏观结构的影响，即孔隙率，大孔的形状和大小，而且还取决于孔壁的性能。这项研究主要涉及孔壁微结构和孔壁中形成的微孔的作用，这些孔影响钢泡沫的机械性能。通过粉末冶金中的空间保持器-水浸出技术产生了具有相当相似的大孔结构但孔壁微结构和孔隙率含量不同的钢泡沫。使用成分为1.75 Ni-1.5 Cu-0.5 Mo-0.2 C，4.0 Ni-1.5 Cu-0.5 Mo-0.2 C和1.5 Mo-0.2 C的预合金钢粉作为母体材料，并使用尿素作为空间保持剂材料。生产的泡沫钢。研究了在粉末化学成分中使用具有不同含量的间隔物和各种合金元素导致的结构和机械性能变化。从泡沫的力学性能出发，讨论了大孔和微孔的形成机理。结果表明，随着间隔物含量的增加，大孔的大小和数量增加，而微孔的大小和数量减少。间隔物含量的增加通过软间隔物颗粒的塑性变形改善了粉末混合物压实期间的致密化。另外，合金中的铜减少了孔壁中的微孔。进行压缩试验以研究泡沫塑料的变形机理和能量吸收特性。含高镍的合金具有更好的压缩性能。泡沫的强度和能量吸收能力随着孔隙率的降低而增加。

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