马氏体不锈钢渗硼工艺研究

摘要用固体渗硼技术对 9Cr18、40Cr13 和 20Cr13 三种马氏体不锈钢分别在850℃、880℃、910℃和 940℃保温 3、5、7、9 个小时进行渗硼。通过光学显微镜观察了三种马氏体不锈钢在不同加热温度和保温时间下，钢渗层的形貌和显微组织，同时得到渗层厚度的范围为 11~81µm。三种马氏体不锈钢进行渗硼后渗层的硬度显著增大且最大硬度差异较大。渗硼层的生长动力学是通过测量不同温度和保温时间下渗层的厚度来分析的。结果表明：生长速率常数 K 随着温度和保温时间的增加而增加。 9Cr18、 40Cr13和 20Cr13 三种马氏体不锈钢的扩散激活能分别为 567，472 和 149 kJ/mol。可以发现，不同钢种的渗硼扩散激活能随着含碳量的升高近似呈线性增长。同时也画出了三种马氏体不锈钢渗硼层的等厚度图,通过等厚度图可以将渗硼的工艺参数和渗层厚度联系起来。59645
毕业论文关键词：马氏体不锈钢；固体渗硼；渗硼层；动力学；扩散激活能
Title Title Title Title Study on the boronizing process of martensite stainless steel Abstract Abstract Abstract Abstract In this study, with solid boriding technology on 9Cr18, 40Cr13 and 20Cr13 three kinds of martensitic stainless steel respectively at 850 ℃, 880 ℃, 910 ℃ and 940 ℃ for 3, 5, 7, 9 hours of boronizing. Three kinds of martensitic stainless steel in different heating temperature and holding time were observed by optical microscope, morphology and microstructure of steel infiltration layer, and layer thickness in the range of 11~81µm. Three kinds of martensitic stainless steel after boronizing layer hardness increases significantly and the maximum hardness difference. The growth kinetics of boriding layer is measured by the different temperature and holding time layer thickness analysis The results show that: the growth rate constant K increases with increasing temperature and holding time. Activation energy were 567，472 and 149 kJ/mol diffusion 9Cr18, 40Cr13 and 20Cr13 three kinds of martensitic stainless steel. It can be found that, different types of steel boronizing diffusion activation energy with the increase of carbon content is approximately linear growth. At the same time also shows three kinds of martensitic stainless steel boriding layer thickness, the thickness can be boronizing process parameters and layer thickness to link.
Key word: Martensitic stainless steel; Solid boronizing; Borides; Kinetics; Activation energy

1绪论1

2实验方法6

2.1实验材料与设备6

2.2实验过程与方案7

3实验结果与讨论8

3.1渗硼层金相组织分析8

3.2渗硼层显微硬度分析11

3.3渗硼层生长动力学分析12

结论23

致谢24

参考文献25

1 绪论绪论绪论绪论渗硼是近代发展起来的一种新型热处理工艺，是重要实用的化学热处理工艺技术，是提高钢件表面耐磨性的有效方法。对钢件进行渗硼处理，可显著提高其表面硬度、耐磨性、抗高温氧化性和抗蚀性，应用非常广泛[1]。但是渗硼层也存在硬度高、脆性大等缺点[2]。同时，对不同的钢材采用不同的渗硼工艺参数（渗硼温度、渗硼时间、保温时间），所得到的渗硼层厚度以及性能也会有很大的不同。这些问题都给渗硼工艺参数的确定带来了一定的问题。因此，近年来国内外专家学者已经开始研究了一些不同钢的渗硼工艺。本文主要就马氏体不锈钢的渗硼工艺进行了研究和总结。
1.1 马氏体不锈钢渗硼工艺研究的意义和方法马氏体不锈钢渗硼工艺研究的意义和方法马氏体不锈钢渗硼工艺研究的意义和方法马氏体不锈钢渗硼工艺研究的意义和方法马氏体不锈钢渗硼工艺研究:http://www.youerw.com/cailiao/lunwen_64926.html