QPQ表面改性层的干滑动摩擦磨损性能研究
本实验是在切削铜质翅片管的刀片常因耐磨性能差而使用周期短的背景下，通过对材料进行合理的QPQ处理使其表面耐磨性提高，从而延长刀片的使用寿命。本试验以Q345b圆钢为原材料，通过设计L16（44）正交实验方案，对调质后的试样进行QPQ盐浴复合处理，然后在常温下对处理后的试样进行摩擦磨损试验。研究利用OM、显微硬度计、SEM、X射线衍射仪、激光共聚焦扫描显微镜等分析设备分别对处理后的渗层显微组织、显微硬度、化学成分、物相、磨痕粗糙度和耐磨性进行分析研究。结果表明Q345b钢在QPQ处理后表面由外到内可形成明显的化合物层、疏松层和扩散层，且渗层厚度受渗氮温度和渗氮时间的影响最大；QPQ表面改性层主要由Fe2-3 N和Fe3O4组成；Q345b钢经过QPQ工艺参数：580℃渗氮120min,370℃氧化40min，所得到的有效渗层最厚；QPQ处理能够显著降低Q345b的摩擦系数，减少磨损量；在常温下试样的磨损机理主要是粘着磨损，并伴随轻微的氧化磨损。
关键词：QPQ盐浴复合技术；正交试验；耐磨性；摩擦磨损
Abstract QPQ technology is a kind of can also greatly improve the wear resistance of the metal surface and the corrosion resistance of a metal surface modification technology and strengthening, in fact, quality is low temperature salt bath salt bath nitriding oxidation or low temperature salt bath carbon and nitrogen carbonitriding salt bath oxidation。QPQ is widely used in machinery manufacturing, automotive and other fields, in order to improve the wear resistance of the products, resistance to fatigue strength and corrosion resistance。
This experiment is in the cutting copper finned tube blade often due to poor wear resistance and short service life under the background of QPQ by appropriate processing technology of materials on the surface of the wear resistance increases, so as to extend the life of the blade。 The test of Q345B steel as raw material, through the design of L16 (44) orthogonal experiment scheme QPQ, after the compound treatment of samples, and then at room temperature of the specimens in the friction and wear tests were performed。 Based on OM, micro hardness tester, SEM, X ray diffraction, laser scanning confocal microscopy analysis of equipment layer microstructure, microhardness after the infiltration process, chemical composition, phase, analysis of grinding roughness and wear resistance of Q345B steel。 The results showed that after QPQ treatment the surface from outside to inside were formed in the white layer, porous layer and the diffusion layer, and the thickness of the layer by the nitriding temperature and nitriding Has the greatest influence on time; QPQ surface modified layer is mainly composed of Fe2-3 N and Fe3O4; steel Q345B best QPQ process parameters for 580 DEG C nitriding 120min, 370 DEG C oxidation 40min; QPQ treatment can significantly reduce the friction coefficient of Q345B and reduce the amount of wear; at room temperature sample wear mechanism if adhesive wear, accompanied by mild oxidation wear。
Keywords: QPQ compound technology; orthogonal test; wear resistance; friction and wear
目 录
第1章 绪论 1
1。1 选题的意义及实用价值 1
1。2 QPQ盐浴复合处理技术 1
1。2。1 概述 1
1。2。2 QPQ盐浴复合处理工艺 2
1。2。3 QPQ盐浴复合处理技术原理 3
1。2。4 QPQ技术的特点及应用 4
1。3 摩擦与磨损 4