本文以我国自主研制的第三代镍基粉末高温合金FGH99为研究对象，研究了铣削径向切深对加工表面完整性参数及其微动磨损性能的影响。通过控制表面粗糙度一致，分析了表面硬度与残余应力对FGH99微动磨损行为的协同作用。研究结果表明：径向切深的增加引起了切削热和切削力的升高，从而导致表面完整性参数发生变化。随着径向切深从0.06 mm增加到0.30 mm，表面硬度从476.8 HV提升至589.2 HV，表面残余拉应力从100.8 MPa增加至661.3 MPa。微动磨损试验表明，在低硬度/低残余拉应力状态下，磨损主要表现为塑性变形和氧化磨损；而在高硬度/高残余拉应力条件下，残余拉应力对磨损的加剧作用超越了硬度提升的抑制作用，形成氧化-磨粒-疲劳复合磨损机制。当径向切深在0.12-0.18 mm范围时，表面硬度和残余拉应力达到最佳平衡，此时FGH99铣削表面表现出最佳的抗微动磨损性能。
This study investigated the effect of the radial depth of cut during milling on the machining-induced surface integrity parameters and the subsequent fretting wear performance of FGH99, a third-generation nickel-based powder sup-eralloy independently developed in China. By maintaining a consistent surface roughness, the synergistic effects of surface hardness and residual stress on the fretting wear behavior of FGH99 were analyzed. The results indicate that an increase in radial depth of cut leads to elevated cutting temperatures and cutting forces, consequently alter-ing the surface integrity parameters. As the radial depth of cut increased from 0.06 mm to 0.30 mm, the surface hardness rose from 476.8 HV to 589.2 HV, and the surface residual tensile stress increased from 100.8 MPa to 661.3 MPa. Fretting wear tests revealed that under conditions of low hardness and low residual tensile stress, wear primarily manifested as plastic deformation and oxidative wear. Conversely, under high hardness and high residual tensile stress conditions, the detrimental effect of tensile stress on wear outweighed the beneficial effect of in-creased hardness, leading to a composite wear mechanism involving oxidation, abrasion and fatigue. An optimal balance between surface hardness and residual tensile stress was achieved within the radial depth of cut range of 0.12-0.18 mm, within which the milled FGH99 surface exhibited the best resistance to fretting wear.
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