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首页> 外文期刊>Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems >Spark Plasma co-Sintering of hot work and high speed steel powders for fabrication of a novel tool steel with composite microstructure
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Spark Plasma co-Sintering of hot work and high speed steel powders for fabrication of a novel tool steel with composite microstructure

机译：热作和高速钢粉的火花等离子体共烧结，用于制造具有复合组织的新型工具钢

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摘要

The capability to produce a hybrid tool steel with properties that can be modulated on the base of the specific application was investigated. Powder metallurgy (PM) offers the possibility to blend and co-sinter different powders to produce a hybrid material which combines the properties of the base materials. With the aim of producing a new steel with high hardness and good toughness, a hot work tool steel (HWTS) and a high speed steel (HSS) powder were selected. Four blends with different composition (HWTS-HSS: 20%-80%, 40%-60%, 60%-40%, 80%-20%) were produced by spark plasma sintering (SPS) and thermally treated. The influence of composition, particle size distribution and oxygen content was evaluated by the means of density. hardness and apparent fracture toughness of the blends. By selecting powders with a small size and narrow particles size distribution near full dense blends with good mechanical properties can be sintered. Large particles hinder the efficient co-sintering due to the different densification kinetics of the powders. High oxygen content in the base powders does not significantly influences the final density but negatively affects the consolidation process, strongly reducing toughness, particularly of the HWTS.
机译：研究了生产具有可根据具体应用进行调节的性能的混合工具钢的能力。粉末冶金（PM）提供了混合和共烧结不同粉末以生产结合了基础材料特性的混合材料的可能性。为了生产具有高硬度和高韧性的新型钢，选择了热作工具钢（HWTS）和高速钢（HSS）粉末。通过火花等离子体烧结（SPS）并进行热处理，制得了四种具有不同组成的共混物（HWTS-HSS：20％-80％，40％-60％，60％-40％，80％-20％）。通过密度评估组成，粒度分布和氧含量的影响。共混物的硬度和表观断裂韧性。通过选择具有小尺寸和窄粒度分布的粉末，可以烧结具有良好机械性能的全致密混合物。由于粉末的不同致密化动力学，大颗粒阻碍了有效的共烧结。基础粉末中的高氧含量不会显着影响最终密度，但会对固结过程产生负面影响，从而大大降低韧性，尤其是HWTS的韧性。

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