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首页> 外文学位 >Surface treatment of cast iron by adding different alloying elements to form metallic glass structure layer using an industrial carbon dioxide laser.
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Surface treatment of cast iron by adding different alloying elements to form metallic glass structure layer using an industrial carbon dioxide laser.

机译：通过使用工业二氧化碳激光器添加不同的合金元素以形成金属玻璃结构层，对铸铁进行表面处理。

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摘要

Wear and corrosion are the two factors that make utilization of metals very costly. Extraordinary amount of time and money is spent to replace metallic parts affected by either wear or corrosion. Cast iron that is used very widely in a host of different industrial products is one such metal. Among the various methods used to improve the properties of metals, production of amorphous metals is highly noticeable. This process is done by treating the base metal in a certain technique which produces a metal that is more resistant to wear and corrosion.; This study was conducted to examine the prospect of forming a metallic glass layer on the surface of gray cast iron by adding boron, silicon and coba coupled with the utilization of an industrial carbon dioxide (CO{dollar}sb2{dollar}) laser. Three different mixing ratios of the aforementioned alloying elements as well as four different groove sizes on the surfaces of the samples were used.; Determination of the characteristics of the laser-formed layers on the surfaces of the samples were conducted by the utilization of x-ray diffraction techniques, mechanical testing, Rockwell hardness testing method, as well as metallographic examinations.; The collected test results led to the conclusion that the formation of amorphous metal on the surface of gray cast iron is possible and practical when certain percentage of mixing ratios of boron, silicon and cobalt are used and lased by a 1300 watts industrial CO{dollar}sb2{dollar} laser. Furthermore, the hardness results indicated that a considerably higher degree of hardness resistivity, up to 70 HRC is achievable on the surface of a gray cast iron that has a hardness resistivity of 32 HRC. The micrographical analysis of the formed layers showed textures of a super-saturated structure that presented a high degree of resistivity to both wear as well as corrosion.; Boron content attributed to achieving of a high degree of hardness. Particularly when mixed with cobalt and silicon, in the ratio of up to 40% boron content, improved the hardness number directly. Beyond the 40% ratio, the effect of boron on the hardness improvement was not very significant. Three geometrically shaped grooves were machined on the surface of each specimen. Each shape was machined in four different depths on four different specimens. The depth of the lased areas ranged from 0.45mm to 2.15mm.
机译：磨损和腐蚀是使金属利用非常昂贵的两个因素。花大量的时间和金钱来更换受磨损或腐蚀影响的金属零件。在许多不同的工业产品中广泛使用的铸铁就是这样一种金属。在用于改善金属性能的各种方法中，非晶态金属的生产非常引人注目。该过程是通过以某种技术处理贱金属而完成的，该技术产生的金属更耐磨损和腐蚀。进行这项研究是为了研究通过添加硼，硅和钴在灰铸铁表面形成金属玻璃层的前景。加上工业二氧化碳（CO {dollar} sb2 {dollar}）激光器的利用。使用上述合金元素的三种不同混合比例以及样品表面上四种不同的凹槽尺寸。通过利用X射线衍射技术，机械测试，洛氏硬度测试方法以及金相检验来确定样品表面上激光形成层的特性。收集的测试结果得出结论，当使用一定百分比的硼，硅和钴的混合比例并以1300瓦的工业CO激光发射时，灰铸铁表面上的非晶态金属形成是可行的。 sb2 {dollar}激光器。此外，硬度结果表明，在具有32 HRC的硬度的灰口铸铁的表面上可以达到更高的硬度，最高可达70 HRC。对形成的层的显微分析表明超饱和结构的织构具有很高的耐磨损性和耐腐蚀性。硼含量归因于高硬度。特别是当与钴和硅混合时，硼含量高达40％的比例直接提高了硬度值。超过40％的比例，硼对硬度提高的作用不是很明显。在每个样品的表面上加工了三个几何形状的凹槽。每个形状在四个不同的样本上以四个不同的深度加工。激光区域的深度范围为0.45mm至2.15mm。

著录项

  • 作者

    Riahi, Mohammad.;

  • 作者单位

    University of Northern Iowa.;

  • 授予单位 University of Northern Iowa.;
  • 学科 Engineering Metallurgy.; Engineering Industrial.; Applied Mechanics.
  • 学位 D.I.T.
  • 年度 1991
  • 页码 141 p.
  • 总页数 141
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 冶金工业;一般工业技术;应用力学;
  • 关键词

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