硼对铬系白口铸铁组织与性能的影响.doc

目录
摘要 II
Abstract III
第一章文献综述 1
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2
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5
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第二章实验过程 11
实验材料和设备 11
实验过程 11
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第三章实验结果与分析 14
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(wt.%)Cr的铬系白口铸铁组织 14
(wt.%)Cr的铬系白口铸铁组织 15
(wt.%)Cr的铬系白口铸铁组织 16
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参考文献 21
致谢 22
硼对铬系白口铸铁组织与性能的影响
摘要: 随着社会科技的飞速发展,人类对机械设备的要求也越来越来高,希望有更长的使用寿命以及更高的精度等。工业机械的失效形式中,磨损虽然一般不会产生灾难性的危害,但是,每年国内外因机械磨损造成的损失是相当大的。而且,随着各种资源的日益稀缺,研究开发成本低耐磨性好的材料,将是未来市场的主要需求方向。
本课题采用合金化的方法,在铬系白口铸铁中加入比较廉价的硼元素,改变铬系白口铸铁的组织,达到提高其耐磨性的目的。利用正交分析法,将不同的硼和铬含量配比列入正交表,通过对合金化后的试样扫描电镜观察和硬度测试,分析硼对铬系白口铸铁组织和性能的影响。最后总结出:硼元素加入到铬系白口铸铁中,改变了组织中碳化物的类型,增加了碳化物的种类和含量,至于碳化物的具体类型,还需进一步的实验研究。
关键词:B,Cr,白口铸铁,硬度,碳化物

Effect of Boron on the Structure and Property of Cr-Alloyed White Cast Iron
Abstract: With the rapid development of social science and technology, human’s demand for mechanical equipment is ing more and more high hoping wear resistence to have a longer service life and higher the industrial machinery failure forms, the wear is although generally will not have disastrous harm, however, at home and abroad each year the loss caused by mechanical wear and tear is considerable. And with all kinds of resources are increasingly scarce, the research and development of low cost good abrasion resistance material, has been the trend of the Times.
This topic adopts the method of alloying in chrome white cast iron with more cheap boron element, changing the chrome white cast iron of the strcture, to achieve the purpose of improving its abrasion resistance. Adopt the method of orthogonal analysis method, researching the effect of the boron on chrome white cast iron, based on the sample after alloying SEM observation and hardness test. Finally conclusion: boron element added to the chrome white cast iron, improves the carbide content in the structure and produces a new carbide, a