粉末冶金高速钢具有优异的室、高温性能，用于工、模具的高端制造。针对传统粉末冶金高速钢制备流程长、设备投入大、污染严重，即限用于材料制备，技术完全被少数发达国家所垄断等问题，本项目提出采用单质粉及碳化物混合粉为原料，通过全固相过程的多重复合活化-反应-扩散-烧结，制备高性能粉末冶金高速钢材料及其近净成形复杂形状件的清洁、便捷制备方法。进一步深入研究机械活化、碳-氧反应活化，以及孔洞周边材料高浓度孔隙/大尺寸原子元素偏聚耦合作用构筑的合金化元素浓度梯度促进Fe元素定向自扩散等致密化机理及其多重复合作用及其机理；同时，利用提出的全固相过程制备技术，设计、研发新型高性能粉末冶金高速钢及其强韧化方法；最后，综合研究高性能粉末冶金高速钢材料制备及其复杂形状件近净成型一体化新技术，探索发展粉末冶金高速钢新型制造技术。

Powder Metallurgy High Speed Steel(PM HSS), which has an excellent performance both at room temperature and at elevated temperature, is widely applied in the manufacturing of high-performance tools and molds. However, the traditional production process of PM HSS is characterized of long process, large investment of production facilities, and heavy contaminations. Moreover, the production techniques are pretty well monopolized by a few developed countries. In this project, a clean and convenient manufacturing technology for PM HSS with high performance and near-net shape has been proposed. A mixture of elemental and carbides powders were employed as the raw materials, which were subsequently densified and completed sintering by a combination effect of multiply activations, and diffusion alloying in solid state. The mechanical alloying, deoxidizing reaction, segregations of large metal atoms in vacancy, which leads to the diffusion gradients associated with oriented diffusion of Fe, have been investigated respectively and synthetically. Meanwhile, based on the proposed solid-fabrication technology, the novel PM HSSs with high performance can be designed and developed, as well as the new alloying methods. The ultimate aim is to investigate the manufacturing technology of near-net shaping PM HSSs with high performance and complex shape and to develop a creative process for the production of PM HSSs.