Effect of hot rotary swaging deformation on microstructure and properties of ASP30 grade powder metallurgical high speed steels strengthened by TiCN
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摘要: 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。Abstract: 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.
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Key words:
- TiCN /
- powder metallurgy /
- high speed steels /
- rotary swaging /
- mechanical properties /
- friction wear tests
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图 3 变形量为56%的合金棒料显微组织核壳结构
Figure 3. Core-shell structure in the microstructure of the steels with 56% deformation
图 4 变形量为56%的合金棒料显微组织中核壳结构成分分布
Figure 4. Composition distribution of the core-shell structure in the microstructure of the steels with 56% deformation
图 6 旋锻变形对样品磨痕界面轮廓的影响
Figure 6. Effect of the rotary swaging deformation on the interface profile of the wear traces
图 7 0%（a）及56%（b）旋锻变形量下材料冲击断口表面显微形貌
Figure 7. Impact fracture micrograph of the steels after 0% (a) and 56% (b) rotary swaging
表 1 ASP30高速钢化学成分（质量分数）
Table 1. Chemical composition of the ASP30+5%TiCN high speed steels
% C W Mo Cr V Co Si Mn Fe 1.28 6.40 5.00 4.20 3.10 8.50 0.30 0.30 余量 
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表 2 旋锻变形量对合金力学性能的影响
Table 2. Effect of rotary swaging deformation on the mechanical properties of alloys
变形量 /
%冲击韧性 /
(J·cm‒2)抗弯强度 /
(N·mm‒2)硬度，
HRC0 7.68 2011.42 66.30 21 11.22 3402.90 62.26 40 12.36 3734.61 62.26 56 14.55 4084.99 62.74 73 13.44 3842.56 61.89
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