软磁铁素体不锈钢的成分设计及性能研究

发布时间：2018-05-31 01:22

  本文选题：软磁材料 + 铁素体不锈钢　； 参考：《南京理工大学》2017年硕士论文

【摘要】：随着自动控制技术的迅猛发展,软磁材料在机电设备中的应用越来越多。铁素体不锈钢是常见的金属软磁材料,与其它软磁材料相比,其磁性能仍有不足,需要进一步提高。另一方面,传统软磁材料为保证耐蚀性就需要加以电镀,这样既污染环境又增加了生产成本,因此开发耐蚀的软磁材料十分必要。本论文是在研究现有铁素体不锈钢成分和性能的基础上,进一步探究组织和化学成分对铁素体不锈钢软磁性能和耐蚀性能的影响。利用X射线荧光分析仪(EDX)、X射线衍射仪(XRD)、背散射电子衍射分析仪(EBSD)及光学显微镜等测试了合金成分、物相及显微组织,同时结合磁性能测试和电化学实验结果分析,得到以下结论:(1)铁素体不锈钢中的Cr和Mo元素对磁性能影响较大;Ti、Si、Cu、Nb及Mn元素的添加有利于耐蚀性能的提高;晶粒尺寸对软磁铁素体不锈钢的耐蚀性和磁性能有显著影响。(2)随着退火温度的升高和退火时间的延长,再结晶晶粒逐渐变大,软磁性能先变好后变差,晶粒尺寸为18μm时具有较好的软磁性能;晶粒尺寸的变化对耐蚀性能的影响不显著。(3)通过正交实验分析,得到Cr、Ti、Mo和Si元素对软磁性能的影响顺序为:TiSiCrMo,对耐蚀性能的影响顺序为:CrMoTiSi。硅元素含量变化对软磁性影响不大,对耐蚀性影响较大且含量越大耐蚀性越好;铜元素的添加对磁性能没有显著的影响,可显著提高耐蚀性;铝含量变化对耐蚀性影响不显著,铝含量越多软磁性越好;镍元素的添加对显微组织、软磁性和耐蚀性无明显改善作用;少量稀土元素的添加有利于改善显微组织和提高软磁性,过多稀土元素的添加对软磁性和耐蚀性没有显著影响。(4)与现有公司样钢相比,设计的新型铁素体不锈钢的软磁性能得到显著提高。性能较好的合金成分为:Cr18.0%、Ti0.4%、Mo1.8%、Si1.0%、Cu0.6%、Al1.3%、Mn1.0%和 S0.05%,还需控制 C+N≤0.015%。
[Abstract]:With the rapid development of automatic control technology, soft magnetic materials are applied more and more in electromechanical equipment. Ferritic stainless steel is a common metal soft magnetic material. Compared with other soft magnetic materials, the magnetic properties of ferrite stainless steel are still insufficient and need to be further improved. On the other hand, traditional soft magnetic materials need to be electroplated to ensure corrosion resistance, which not only pollutes the environment but also increases the production cost, so it is necessary to develop corrosion resistant soft magnetic materials. Based on the study of the composition and properties of ferrite stainless steel, the effects of microstructure and chemical composition on the soft magnetic properties and corrosion resistance of ferrite stainless steel were investigated in this paper. The composition, phase and microstructure of the alloy were measured by means of X-ray fluorescence analyzer edX X ray diffractometer, backscatter electron diffraction analyzer (EBSD) and optical microscope. At the same time, the magnetic properties and electrochemical experimental results were analyzed. The following conclusions are obtained: (1) the addition of Cr and Mo elements in ferrite stainless steel has a great influence on the magnetic properties. The addition of Cu NB and mn elements is beneficial to the improvement of corrosion resistance. Grain size has a significant effect on corrosion resistance and magnetic properties of soft magnetic ferrite stainless steel. When the grain size is 18 渭 m, the soft magnetic properties are better, and the effect of grain size on corrosion resistance is not significant. (3) by orthogonal experiment, it is found that the order of the effects of CrTiMo and Si on soft magnetic properties is: 1: TiSiCrMoand the order of effect on corrosion resistance is: CrTiTiSiSi. The content of silicon has little effect on the soft magnetic properties, and the larger the corrosion resistance is, the better the corrosion resistance is. The addition of copper has no significant effect on the magnetic properties, but it can significantly improve the corrosion resistance, while the change of aluminum content has no significant effect on the corrosion resistance. The more aluminum content, the better the soft magnetism, the less the addition of nickel, the less the microstructure, the better the corrosion resistance and the better the microstructure, the better the soft magnetic properties, the more the addition of rare earth elements, the better the microstructure and the better the soft magnetic properties. The soft magnetic properties and corrosion resistance of the new ferrite stainless steel were improved significantly compared with the existing steel. The alloy components with better properties are: 1: Cr18.0 and Ti0.4Mo1.8and about Si1.0and about Cu0.6Al1.3Mn1.0% and S0.05. it is also necessary to control C N 鈮，

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