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采用铸造法制备了钼含量为10wt%的高钼高速钢,利用SEM、XRD、EDS分析了显微组织,并利用ML-100型销盘式磨损试验机测试了磨粒磨损性能。结果表明:高钼高速钢中的碳化物为M_2C型碳化物,经过热处理后,其基体组织为马氏体和奥氏体。磨粒尺寸与载荷对高钼高速钢的磨损性能有显著影响,随着磨粒尺寸或载荷增大,磨损量显著增加。磨损失效形式为磨粒对高速钢的显微切削。当磨粒尺寸及载荷较小时,M_2C型碳化物能有效地发挥作用而抵抗磨粒的显微切削,反之,当磨粒尺寸及载荷较大时,磨粒经过碳化物时会对其耕犁而掀起碳化物,碳化物不能有效的保护基体,导致磨损较为严重。
High-molybdenum high-speed steel with molybdenum content of 10wt% was prepared by casting method. The microstructure was analyzed by SEM, XRD and EDS. The abrasive wear performance was tested by ML-100 pin-on-plate wear tester. The results show that the carbides in the high-molybdenum high-speed steel are M_2C carbides. After heat treatment, the matrix structure is martensite and austenite. Abrasive grain size and load have a significant impact on the wear properties of high-molybdenum high-speed steel, with a significant increase in wear as grain size or load increases. Wear failure of the form of abrasive particles on the high-speed micro-cutting. When the particle size and load is small, M_2C carbide can effectively play a role in the anti-abrasive micro-cutting, on the contrary, when the abrasive size and load is large, the carbide particles through the carbide plow And set off carbides, carbides can not effectively protect the substrate, leading to more serious wear and tear.