等温淬火球墨铸铁材料表面磨损机理的研究

发布时间：2018-06-12 21:53

本文选题：等温淬火球墨铸铁 + 有限单元法　；参考：《长春工业大学》2017年硕士论文

【摘要】：材料表面刮伤现象经常出现在各类发动机零部件上,如发动机活塞,齿轮,凸轮以及传动轴。由于等温淬火球墨铸铁(ADI)有很好的自润滑性,所以这种材料的应用变得越来越广泛。由于刮伤问题严重影响结构部件使用寿命,未得到有效提高ADI材料抗刮伤性能途径,针对此问题,论文主要开展了以下三方面的研究工作:(1)推导金属材料表面损伤本构方程。简化金属材料表面损伤的基本物理过程,提出影响其变化的因素,依据机械动力学基本方程构建基础本构方程,引入应力-应变关系和热力学条件,获得有限单元法基本解算过程,依据金属材料磨损影响因素的不同,综合得到影响最终本构方程的物理因素方法。(2)等温淬火球墨铸铁材料的刮伤实验。研究等温淬火球墨铸铁材料的刮伤实验原理及方法,获得研究等温淬火球墨铸铁材料的实验基本过程,针对每种类别材料都完成不同的热处理工艺处理,选择刮伤实验设备,完成包括粗糙度测试与硬度测试,选取最终优质样品进行刮伤实验,获取不同类别不同组的测试实验结果,对比了镍元素含量对样品抗刮伤性能的影响,对比了不同热处理条件下刮伤载荷的变化以及材料硬度对划痕的产生的影响。(3)构建等温淬火球墨铸铁材料刮伤模型。依据不同热处理温度,组成元素,润滑条件,载荷受力面积等影响因素,重新构建该材料对应于磨损问题的基本属性;构建物理模型结构,完成瞬态热固耦合分析,获得不同压力,不同时间,不同热处理温度,不同载荷面积的数据结果,完成数据处理及分析工作,为该材料的工程应用问题提供相对准确的物理模型。文章研究了金属材料表面磨损力学本构方程,获得理想模型数据,为等温淬火球墨铸铁材料刮伤性能研究,提供物理模型,同时完成了等温淬火球墨铸铁材料刮伤性能实验研究。实验结果证明,镍含量较高的ADI有比较高的抗刮伤能力。同样元素组成的样品之间硬度并不是衡量刮伤性能的决定性因素。
[Abstract]:Surface scratches often occur in engine parts such as engine pistons, gears, cams and drive shafts. Due to the good self-lubricating properties of isothermal quenched ductile iron, the application of this material has become more and more extensive. As the problem of scratch seriously affects the service life of structural parts, it is not effective to improve the scratch resistance of ADI materials. Aiming at this problem, this paper mainly studies the following three aspects: 1) deducing the constitutive equation of surface damage of metal materials. The basic physical process of surface damage of metallic materials is simplified. The factors affecting the surface damage of metallic materials are proposed. The basic constitutive equations are constructed according to the basic equations of mechanical dynamics. The stress-strain relationship and thermodynamic conditions are introduced. The basic calculation process of finite element method was obtained. According to the different factors affecting the wear of metal materials, the scrape experiments of austempered ductile iron materials were obtained by synthesizing the physical factors that affect the final constitutive equation. The principle and method of scrape test of isothermal quenched ductile iron were studied, and the basic process of the experiment was obtained. According to the different heat treatment process of each kind of material, the scrape test equipment was selected. Finish the roughness test and hardness test, select the final high quality sample for scratch test, obtain the test results of different kinds of different groups, compare the effect of nickel content on the scratch resistance of the sample. The scrape model of isothermal quenched ductile iron was constructed by comparing the change of scrape load under different heat treatment conditions and the effect of hardness on scratch. According to the influence factors such as different heat treatment temperature, component element, lubrication condition, load force area and so on, the basic properties of the material corresponding to the wear problem are re-constructed, the physical model structure is constructed, and the transient thermal-solid coupling analysis is completed. The data of different pressure, different time, different heat treatment temperature and different load area are obtained, and the data processing and analysis work is completed, which provides a relatively accurate physical model for the engineering application of the material. In this paper, the constitutive equations of surface wear mechanics of metallic materials are studied, and the ideal model data are obtained, which provide a physical model for the study of scrape properties of isothermal quenched ductile iron materials. At the same time, the scrape properties of isothermal quenched ductile iron were studied. The experimental results show that ADI with higher nickel content has higher scrape resistance. Hardness between samples made of the same elements is not a decisive factor in determining scratch properties.
【学位授予单位】：长春工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TG143.5

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