Pellizzari Massimo, Fedrizzi Anna, Zadra Mario
Department of Industrial Engineering, University of Trento, via Sommarive 9, Trento 38123, Italy.
Iveco Defence Vehicles, Product Development & Engineering, via Volta 6, Bolzano 39100, Italy.
Materials (Basel). 2016 Jun 16;9(6):482. doi: 10.3390/ma9060482.
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.
热作工具钢（AISI H13）和高速钢（AISI M3:2）粉末成功地进行了共烧结，以生产出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。为促进共烧结（由于两种钢的各种致密化动力学，共烧结存在困难），通过机械研磨（MM）细化了颗粒尺寸和结构。使用放电等离子烧结（SPS）获得了接近全密度（>99.5%）且微观结构非常精细和均匀的样品。混合物（20、40、60、80 wt% H13）的密度符合线性混合规则。它们的硬度呈现正偏差，这可归因于二次颗粒的强化作用改变了压痕过程中的应力分布。鉴于H13颗粒产生的裂纹偏折和裂纹止裂作用，可以解释富M3:2混合物的增韧现象。
