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研究了滚珠丝杠用GCr15钢表面感应淬火后的组织和磨损机理。采用SEM、显微硬度计和XRD分别观察和检测了表面感应淬火试样的微观组织、断口形态、从表层到芯部的显微硬度分布以及淬火相变硬化区的物相,分别在低、中、高磨损载荷下,对试样进行往复式线性干摩擦磨损测试,分析研究了摩擦系数、磨损表面和磨屑形貌。结果表明:相变硬化区主要由隐晶马氏体、残留奥氏体及弥散分布的粒状碳化物组成;表层到芯部的断口形态呈明显变化;随着载荷增加,摩擦系数降低;低载荷下磨损表面呈现轻微划痕和少量脱离的碳化物颗粒,发生轻微磨粒磨损;中载荷下主要发生磨粒磨损和轻微剥层磨损;高载荷下磨损表面有严重犁沟,磨屑呈大片状,主要发生剧烈磨粒磨损和剥层磨损。
The microstructure and wear mechanism of ball screw GCr15 steel after induction hardening were studied. The microstructure and fracture morphology of the surface induction quenched samples were observed and examined by SEM, microhardness tester and XRD respectively. The microhardness distribution of the samples from the surface to the core and the phases of the quenched transformation hardening zone were observed at low, Under medium and high abrasion loads, the reciprocating linear dry friction and wear tests were carried out on the specimens, and the friction coefficient, wear surface and wear debris morphology were analyzed. The results show that the phase change hardened zone is mainly composed of cryptocrystalline martensite, retained austenite and dispersed carbides. The fracture morphology changes obviously from the surface layer to the core. The friction coefficient decreases with the increase of the load. The low load Under the wear surface showed a slight scratches and a small amount of carbide particles from the separation, the occurrence of slight abrasive wear; abrasive wear and slight wear under moderate load; slight wear on the surface under severe furrows, debris was large Shape, the main occurrence of severe abrasive wear and peeling wear.