45钢深层QPQ处理工艺的研究
发布时间：2018-10-30 19:00
【摘要】：由于常规QPQ技术处理的工件化合物层只有15μm左右,不能满足工件耐磨性和抗腐蚀性能方面的更高要求,而深层QPQ技术处理的化合物层厚度达到30μm以上,所以能够用来处理更高要求的零件；45钢作为应用广泛的中碳钢,因此研究其深层QPQ处理工艺对该技术的进一步应用推广有着重要的意义。本文对45钢的深层QPQ处理工艺进行了工艺试验,研究了氰酸根、温度、氮化时间对渗层的影响；并用光学显微镜、扫描电镜、X射线衍射仪分析了渗层组织以及形貌；讨论了不同QPQ处理工艺的45钢在力学性能、磨损性能、抗腐蚀性能等方面的差异。结果表明：45钢深层QPQ工艺处理后的渗层组织由外及里是氧化膜、疏松层、化合物层、中间层和扩散层；化合物层深度达到35gm以上,疏松层小于10μm,表面硬度HV0.1≥600；氮元素分布在整个化合物层比较平缓,最高氮浓度并不在渗层的最表面;渗层中的白两层主要由Fe3O4、ε相、Fe4N相组成,中间层由Fe4N和α组成,不同冷却方式获得的中间层的相不同;相比常规QPQ处理,深层QPQ处理能提高冲击韧性、延伸率和断面收缩率,但同时又使屈服强度、抗拉强度降低；与常规QPQ处理的45钢相比经深层QPQ处理后,45钢的滚动磨损性能提高2.8倍,滑动磨损性能提高4倍；45钢抗腐蚀失重性为常规QPQ处理的13.3倍；45钢深层QPQ处理试样盐雾试验的生锈时间是常规QPQ处理的1.78倍；深层QPQ处理+密封剂试样盐雾试验的生锈时间是常规QPQ处理的5.1倍,且45钢试样经深层QPQ处理+密封剂处理后,抗中性盐雾腐蚀能力都大于300h。
[Abstract]:Because the compound layer of workpiece treated by conventional QPQ technology is only about 15 渭 m, it can not meet the higher requirements of wearability and corrosion resistance of workpiece, while the thickness of compound layer treated by deep QPQ technology is more than 30 渭 m. So can be used to handle higher requirements of the parts; 45 steel is widely used as medium carbon steel, so it is of great significance to study the deep QPQ treatment process for the further application of the technology. In this paper, the effects of cyanate, temperature and nitriding time on the surface layer of 45 steel were studied by QPQ treatment, and the microstructure and morphology of the layer were analyzed by means of optical microscope, scanning electron microscope, X-ray diffractometer, scanning electron microscope (SEM), X-ray diffractometer (XRD), X-ray diffraction (XRD) and scanning electron microscope (SEM). The differences in mechanical properties, wear properties and corrosion resistance of 45 steel treated with QPQ were discussed. The results show that the microstructure of the deep layer of 45 steel treated by QPQ process is oxide film, loose layer, compound layer, intermediate layer and diffusion layer, the depth of compound layer is more than 35gm, the loose layer is less than 10 渭 m, and the surface hardness HV0.1 is 鈮，
本文编号：2300890
[Abstract]:Because the compound layer of workpiece treated by conventional QPQ technology is only about 15 渭 m, it can not meet the higher requirements of wearability and corrosion resistance of workpiece, while the thickness of compound layer treated by deep QPQ technology is more than 30 渭 m. So can be used to handle higher requirements of the parts; 45 steel is widely used as medium carbon steel, so it is of great significance to study the deep QPQ treatment process for the further application of the technology. In this paper, the effects of cyanate, temperature and nitriding time on the surface layer of 45 steel were studied by QPQ treatment, and the microstructure and morphology of the layer were analyzed by means of optical microscope, scanning electron microscope, X-ray diffractometer, scanning electron microscope (SEM), X-ray diffractometer (XRD), X-ray diffraction (XRD) and scanning electron microscope (SEM). The differences in mechanical properties, wear properties and corrosion resistance of 45 steel treated with QPQ were discussed. The results show that the microstructure of the deep layer of 45 steel treated by QPQ process is oxide film, loose layer, compound layer, intermediate layer and diffusion layer, the depth of compound layer is more than 35gm, the loose layer is less than 10 渭 m, and the surface hardness HV0.1 is 鈮，
本文编号：2300890
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