热旋锻变形对TiCN强化ASP30粉末冶金高速钢的组织及性能研究

采用粉末冶金法制备TiCN强化ASP30粉末冶金高速钢棒料，研究TiCN及旋锻变形量对ASP30高速钢力学性能与显微组织的影响，并研究其摩擦磨损行为。结果表明，添加质量分数5%的TiCN可明显提高ASP30的耐磨性。旋锻变形量为56%的ASP30+5%TiCN合金棒料经淬火-回火处理后，抗弯强度达到4084.99 N?mm?2，抗冲击韧性达到14.55 J?cm?2，相较于未旋锻态，其强韧性得到明显提升。在反复径向旋锻变形作用下，TiCN硬质相明显破碎，呈弥散颗粒状分布，且旋锻可以促进TiCN生成核壳结构，硬质相与基体之间的润湿性与结合能力得到提高，抑制了磨削过程中硬质相/基体间裂纹的产生。

Effect of hot rotary swaging deformation on microstructure and properties of ASP30 grade powder metallurgical high speed steels strengthened by TiCN

The ASP30 powder metallurgy (PM) high speed steels strengthened by TiCN were fabricated by powder metallurgy process, the effects of TiCN and rotary awaging deformation on the mechanical properties, microstructure, and tribological behaviors of the ASP30 steels were investigated. The results show that, adding TiCN with the mass fraction of 5% can effectively improve the wear resistance of ASP30. After the quenching-tempering treatment, the bending strength of ASP30+5%TiCN with the 56% swaging deformation is 4084.99 N?mm?2, and the impact toughness is 14.55 J?cm?2. The strength and toughness of the ASP30 steels after swaging are effectively improved. After the repeated radial swaging deformation, the TiCN phases are obviously broken and distribute as the dispersion particles. Besides, the rotary swaging can promote the formation of TiCN core-rim structure and improve the wettability and bonding ability between the hard phase and the matrix, inhibiting the generation of cracks between the hard phase and the matrix during grinding.