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以不同的预先热处理工艺对GCr15SiMn液压马达导轨进行热处理,对其显微组织、耐磨性和力学性能进行了测试和分析。结果表明,预先热处理中采用分级球化退火和分级去应力退火,可促进组织中碳化物呈细小、弥散的分布,提高导轨的耐磨损性能和力学性能。与常规预先热处理相比,分级球化退火和常规去应力退火可使导轨的磨损体积减少34.64%、抗拉强度增加15 MPa、冲击功增加3.8 J;分级球化退火和分级去应力退火则可使导轨的磨损体积减少53.76%、抗拉强度增加26 MPa、冲击功增加5.9 J。
The GCr15SiMn hydraulic motor guide rail was heat-treated with different pre-heat treatments, and its microstructure, wear resistance and mechanical properties were tested and analyzed. The results show that the fractional spheroidizing annealing and graded stress-relieving annealing in the pre-heat treatment can promote the distribution of the carbides in the microstructure to be small and disperse, and improve the wear resistance and mechanical properties of the guide rail. Compared with the conventional pre-heat treatment, the segmented spheroidizing annealing and the conventional stress-relieving annealing can reduce the wear volume of the guide rail by 34.64%, the tensile strength by 15 MPa and the impact energy by 3.8 J; Reducing the wear volume of the guide rail by 53.76%, increasing the tensile strength by 26 MPa, and increasing the impact energy by 5.9%.