为了探讨无毒液体渗氮工艺对CrNiMo钢渗层的效果,采用正交试验方法研究了氮化温度、氮化时间和尿素添加量对CrNiMo钢液体渗氮层的脆性、渗层厚度和硬度的影响.结果表明,尿素添加量是影响渗层脆性和硬度的主要因素,氮化时间是影响渗层厚度的主要因素,氮化温度对渗层厚度和硬度的影响较小.最优渗氮工艺为570℃,氮化时间5 h,尿素添加量为50 g/h,此时渗层厚度为0.235mm,最高硬度为920HV,脆性级别为1级.
The effects of liquid nitriding parameters including temperature,time,and dosage of urea on the brittleness,thickness,and hardness of the nitrided layer were investigated by making use of orthogonal test.It has been found that the dosage of urea has major effect on the brittleness and hardness of the nitrided layer,while nitriding time has major effect on the thickness of the nitrided layer.However,nitriding temperature had a minor effect on the thickness and hardness of the nitrided layer.The optimized nitriding temperature,nitriding time,and dosage of urea were suggested as 570℃,5 h,and 50 g/h,respectively.The resulting nitrided layer obtained under the optimized conditions had a thickness of 0.235 mm and a maximum hardness of 920 HV,while its brittleness was ranked as grade 1.
参考文献
| [1] | 郭海祥.氮碳共渗复合强化[J].金属热处理,1995(05):15-20. |
| [2] | 张兰,陈波,任学平.25Cr5MoA钢的热处理工艺[J].金属热处理,2005(11):64-67. |
| [3] | 郑长根 .rF1-ABI盐浴氮化工艺[J].机电工程,1997,20:8-12. |
| [4] | 陆卫东.柴油机喷油器精密偶件的材料选择及热处理[J].柴油机,1996(05):21-22. |
| [5] | 韦习成.盐浴渗氮技术的现状和发展思考[J].热处理,2005(02):16-19. |
| [6] | 周瑜.表面工程及其应用[J].工程与维修,1995(06):6-7. |
| [7] | 许少华.盐浴氮化技术国产化[J].洪都科技,2001(01):30-37. |
| [8] | 韦习成,符仁钰,李麟.盐浴渗氮工艺参数和渗氮层硬度的关系[J].金属热处理,2000(12):16-17. |
| [9] | GB/T 11354-2005.钢铁零件渗氮层深度测定和金相组织检验[S].,2005. |
| [10] | 雷廷权;傅家祺.热处理工艺方法300种[M].北京:机械工业出版社,1993 |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%