氧化锆含量对TZM合金显微组织和磨粒磨损性能的影响

Effect of Zirconia Content on Microstructure and Abrasive Wear Properties of TZM Alloy

摘要:

采用粉末冶金和轧制法制备了不同ZrO₂含量的TZM合金，研究了TZM合金的晶粒尺寸、硬度和耐磨粒磨损性能。对TZM合金在10、15、20 N和磨料粒径为7、11、18、38 μm的条件下进行磨粒磨损试验。结果表明，TZM合金中添加的ZrO₂颗粒主要分布在晶界处。含1.5wt% ZrO₂的TZM合金显著细化了合金的晶粒，硬度提高了16%。磨损试验结果表明，含1.5wt% ZrO₂的TZM合金在所有载荷和磨粒尺寸下具有最低的失重率和优异的耐磨性能，磨损性能最高提高了12%。高硬度的ZrO₂成为载荷的主要承担者，并且作为第二相阻碍磨粒刺入基体的深度，有效的抵抗磨粒划伤，是优异耐磨性的主要原因。

Abstract:

The TZM alloys with different contents of ZrO₂ were prepared by powder metallurgy and rolling, and the grain size, hardness, and abrasive wear resistance of TZM alloy were studied. The abrasive wear test of TZM alloy was conducted under the conditions of 10, 15, and 20 N and abrasive particle sizes of 7, 11, 18, and 38 μm. The results show that the added ZrO₂ particles in TZM alloy are mainly distributed at the grain boundaries. The grains of TZM alloy containing 1.5wt% ZrO₂ are significantly refined, and the hardness is increased by 16%. The wear test results show that TZM alloy containing 1.5wt% ZrO₂ has the lowest mass loss rate and excellent wear resistance under all loads and abrasive sizes, and the wear performance is improved by 12%. The ZrO₂ with high hardness becomes the main bearer of the load, and as the second-phase, it hinders the abrasive particles from entering the matrix and effectively resists the scratch of the abrasive particles, which is the main reason for the excellent wear resistance.