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Spark Plasma Co-Sintering of Mechanically Milled Tool Steel and High Speed Steel Powders

机译：机械铣削工具钢和高速钢粉的火花等离子体共烧结

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Hot work tool steel (AISI H13) and high speed steel (AISI M3:2) powders were successfully co-sintered to produce hybrid tool steels that have properties and microstructures that can be modulated for specific applications. To promote co-sintering, which is made difficult by the various densification kinetics of the two steels, the particle sizes and structures were refined by mechanical milling (MM). Near full density samples (>99.5%) showing very fine and homogeneous microstructure were obtained using spark plasma sintering (SPS). The density of the blends (20, 40, 60, 80 wt % H13) was in agreement with the linear rule of mixtures. Their hardness showed a positive deviation, which could be ascribed to the strengthening effect of the secondary particles altering the stress distribution during indentation. A toughening of the M3:2-rich blends could be explained in view of the crack deviation and crack arrest exerted by the H13 particles.
机译：成功地将热作模具钢（AISI H13）和高速钢（AISI M3：2）粉末共烧结，以生产具有可针对特定应用进行调制的性能和微观结构的混合工具钢。为了促进共烧结，这由于两种钢的各种致密化动力学而变得困难，通过机械研磨（MM）细化了粒度和组织。使用火花等离子体烧结（SPS）获得了近乎全密度的样品（> 99.5％），显示出非常精细和均匀的微观结构。共混物（20、40、60、80 wt％H13）的密度与混合物的线性规律一致。它们的硬度显示出正偏差，这可以归因于次级颗粒的强化作用，改变了压痕过程中的应力分布。鉴于H13颗粒施加的裂纹偏差和裂纹止裂，可以解释富含M3：2的混合物的增韧。

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