通过在盐浴渗氮中施加7.5V的直流电场,在不同外热温度(545～575℃),不同保温时间(60 ～ 120 min)下对35钢进行盐浴渗氮,研究了直流电场对35钢盐浴渗氮动力学的影响.利用光学显微镜、X射线衍射仪对渗层的显微组织、厚度及物相进行了测试和分析.结果表明:直流电场对活性氮原子在基体内部的扩散有显著促进作用,提高渗氮速度,降低盐浴渗氮温度或缩短保温时间;直流电场盐浴渗氮的扩散系数都比常规盐浴渗氮提高约2倍,扩散激活能从常规盐浴渗氮的220 kJ/mol降低到181 kJ/mol,从而达到增加渗层厚度的显著效果.有无直流电场条件下盐浴渗氮,35钢渗层主要物相均为ε-Fe3N及少量γ'-Fe4N.
参考文献
| [1] | 刘建中;谢里阳;徐灏 .35钢循环应力应变特性的实验研究[J].机械强度,1994,16(04):10-12. |
| [2] | 蔡伟,魏国方,孟凡娜,胡静.QPQ盐浴复合处理时间对304不锈钢耐磨性的影响[J].材料热处理学报,2013(01):153-156. |
| [3] | 师蔷,王群,曹宏哲.QPQ盐浴复合处理对35钢组织和性能的影响[J].热加工工艺,2008(20):84-85,89. |
| [4] | LI Gui-jiang;PENG Qian;WANG Jun et al.Surface micmstructure of 316L austenitic stainless steel by the salt bath nitrocarburizing and postoxidation process known as QPQ[J].Surface and Coatings Technology,2008,202:2865-2870. |
| [5] | Gui-jiang Li;Qian Peng;Cong Li .Microstructure analysis of 304L austenitic stainless steel by QPQ complex salt bath treatment[J].Materials Characterization,2008(9):1359-1363. |
| [6] | 周正华,谢飞,胡浩波,胡静.直流电场对粉末法渗铝的影响[J].材料热处理学报,2008(06):154-157. |
| [7] | Zhou, ZH;Xie, F;Hu, J .A novel powder aluminizing technology assisted by direct current field at low temperatures[J].Surface & Coatings Technology,2008(1/2):23-27. |
| [8] | 周正华,谢飞,潘献波,王燕,胡静.施加直流电场的快速粉末渗铬工艺[J].材料热处理学报,2011(02):130-133. |
| [9] | 周正寿,解后润,魏国方,胡静.直流电场对35钢盐浴碳氮共渗技术的影响[J].材料热处理学报,2015(01):187-191. |
| [10] | Jacquet, P.;Coudert, J.B.;Lourdin, P. .How different steel grades react to a salt bath nitrocarburizing and post-oxidation process: Influence of alloying elements[J].Surface & Coatings Technology,2011(16):4064-4067. |
| [11] | Fan-Shiong Chen;Kuo-Liang Wang .The kinetics and mechanism of multi-component diffusion on AISI 1045 steel[J].Surface & Coatings Technology,1999(2/3):239-248. |
| [12] | A. Bouayad;Ch. Gerometta;A. Belkebir .Kinetic interactions between solid iron and molten aluminium[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2003(1/2):53-61. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%