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针对煤矿液压支架油缸活塞杆(材质40Cr钢)服役过程中存在耐磨性、耐蚀性较低的问题,提出表面渗硼改性工艺。从活塞杆切取试样,利用金相、XRD、显微硬度、耐蚀性能测试等方法研究了试样在未调质和调质两种初始状态下经渗硼及渗硼后淬火对其渗硼层组织和性能的影响。研究结果表明:活塞杆渗硼前的调质可以促进硼化物的形成与析出,使其析出强化作用更显著;渗硼后再经淬火的渗硼层硬度略有降低,从表面到心部的硬度梯度有所减小,表面脆性降低,塑性和韧性提高。
Aiming at the problem that the wear resistance and the corrosion resistance of piston rod (material 40Cr steel) of the hydraulic support hydraulic cylinder of coal mine are in service, the surface boronizing modification process is proposed. The sample was cut from the piston rod, and the microstructure, XRD, microhardness and corrosion resistance test were used to study the effect of quenching on the infiltrated and quenched samples Effect of boron layer structure and properties. The results show that the quenching of the piston rod before boronizing can promote the formation and precipitation of boride and make the precipitation strengthening effect more remarkable. After boronizing, the hardness of the boronizing layer quenched slightly decreases from the surface to the heart The hardness gradient is reduced, the surface brittleness is reduced, and the plasticity and toughness are increased.