感应熔铸Ni60涂层中稀释率的控制研究及工艺优化

发布时间：2018-11-03 13:55

【摘要】：感应加热技术对于回转类零件改性及修复具有独特的优势,因此在表面热处理领域中应用十分广泛。然而现有涂层的制备工艺还不成熟,熔覆过程中易出现流淌、氧化等问题,并且针对合金涂层的质量尚无直观的评价标准,不能定量分析涂层质量,此问题已成为限制感应熔覆技术发展的主要因素。本课题以感应熔铸合金涂层的稀释率控制和工艺优化为研究目标,深入研究涂层与基材之间的扩散规律,引入稀释率概念,探索稀释率的控制方法。主要的研究内容如下所示:针对感应熔覆过程中涂层流淌及氧化问题,改善涂层制备技术,引入感应熔铸工艺。搭建感应熔铸Ni60的实验平台,分析涂层与基体的组织成分,重点观察涂层与基体之间的元素扩散现象,以及由于扩散导致的硬度分布变化。借鉴激光熔覆中稀释率的研究,引入感应熔铸稀释率概念,并总结其计算方法。根据感应熔铸稀释率的计算方法,温度场的分布是工件熔化稀释的基础。因此考虑材料的温变效应,建立含有相变过程的感应熔铸温度场模型,并采用热电偶测温进行验证。分析不同工艺参数对温度场分布的影响规律,重点研究冷却凝固过程中温度场变化,探索感应熔铸过程中热流传递规律,为熔池分析提供基础。在已验证的温度场模型计算基础上,建立感应熔铸熔池模型,研究在加热及冷却过程中熔池形貌变化及熔池移动规律,计算熔池内部的温度场分布特征,研究熔池中溶质流动规律。另外,探索工艺参数对感应熔铸熔池截面积大小以及熔池内部的流动剧烈程度的影响。基于对熔池的研究,根据感应熔铸稀释率的计算方法,研究工艺参数单因素对稀释率大小的影响规律。采用正交试验分析方法,设置残余应力值为辅助目标参数,分析各个因素对稀释率的敏感程度,筛选出较优的因素组合。结合感应熔铸稀释规律的实验研究,总结稀释率的控制方法并优化感应熔铸的工艺。
[Abstract]:Induction heating technology has unique advantages in modification and repair of rotary parts, so it is widely used in the field of surface heat treatment. However, the existing coating preparation process is not mature, and the process of cladding is prone to flow, oxidation and other problems, and there is no intuitive evaluation standard for the quality of alloy coating, so the coating quality can not be quantitatively analyzed. This problem has become the main factor limiting the development of induction cladding technology. The aim of this paper is to study the dilution rate control and process optimization of induction casting alloy coating. The diffusion law between the coating and the substrate is deeply studied. The concept of dilution rate is introduced and the control method of dilution rate is explored. The main research contents are as follows: aiming at the problem of coating flow and oxidation during induction cladding process, the coating preparation technology is improved and induction melting casting process is introduced. The experimental platform of induction melting casting Ni60 was set up to analyze the microstructure of coating and substrate and to observe the phenomenon of element diffusion between coating and substrate and the change of hardness distribution caused by diffusion. Based on the study of dilution rate in laser cladding, the concept of induction casting dilution rate is introduced and its calculation method is summarized. According to the method of calculating dilution rate of induction melting casting, the distribution of temperature field is the basis of melting dilution of workpiece. Therefore, considering the effect of material temperature variation, the model of induction melting casting temperature field with phase change process is established and verified by thermocouple. The influence of different process parameters on the distribution of temperature field is analyzed. The variation of temperature field during cooling and solidification is studied, and the heat flux transfer law in induction casting process is explored, which provides the basis for the analysis of molten pool. On the basis of the verified temperature field model, the induction molten pool model is established to study the variation of molten pool morphology and the rules of molten pool movement during heating and cooling, and to calculate the distribution characteristics of temperature field inside the molten pool. The flow law of solute in molten pool was studied. In addition, the influence of process parameters on the cross section area of induction molten pool and the intensity of flow inside the molten pool is explored. Based on the study of molten pool and the calculation method of dilution rate of induction casting, the influence of single factor of process parameters on dilution rate is studied. By means of orthogonal test method, the residual stress value is set as the auxiliary target parameter, and the sensitivity of each factor to dilution rate is analyzed, and the better combination of factors is selected. Based on the experimental study of dilution law of induction melting casting, the control method of dilution rate is summarized and the process of induction casting is optimized.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG174.4

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