| ZHONG Li,WANG Shuai-feng,MEN Xin-hao,HAN Xi.Research on Plasma Nitriding Process of 38CrMoAl Steel with Ti Catalyst[J],50(12):159-166 |
| Research on Plasma Nitriding Process of 38CrMoAl Steel with Ti Catalyst |
| Received:December 22, 2020 Revised:June 04, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2021.12.016 |
| KeyWord:plasma nitriding titanium catalyst 38CrMoAl steel microstructure |
| Author | Institution |
| ZHONG Li |
School of Mechatronics and Vehicle Engineering, Chongqing Jiaotong University, Chongqing , China |
| WANG Shuai-feng |
School of Mechatronics and Vehicle Engineering, Chongqing Jiaotong University, Chongqing , China |
| MEN Xin-hao |
School of Mechatronics and Vehicle Engineering, Chongqing Jiaotong University, Chongqing , China |
| HAN Xi |
School of Mechatronics and Vehicle Engineering, Chongqing Jiaotong University, Chongqing , China |
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| Abstract: |
| This paper aims to explore the mechanism of plasma nitriding process for 38CrMoAl steel. Under the condition that other process parameters are determined, through the contrast test of conventional plasma nitriding and titanium catalyzed plasma nitriding, the variation law of titanium catalyzed plasma nitriding treatment with nitriding time of 38CrMoAl steel is studied. The surface hardness, depth, micro-structure and SEM morphology of the samples are observed to explore the effect of different treatment processes and the nitriding mechanism of plasma nitriding. It is shown that in the first 3 hours of nitriding, the thickness of nitriding layer increases obviously. When the nitriding time exceeds 3 hours, the thickness of nitriding layer tends to be saturated. At the same time, comparing with the surface hardness of titanium-catalyzed nitriding at different times, there is little difference in surface hardness in 3, 5 and 8 hours. It is concluded that the optimal nitriding time is 3 hours under the conditions of nitriding temperature 535 ℃ and ammonia flow rate 2.0 L/min. Under this process parameter, the surface hardness of titanium ion nitriding is 1160.8HV, and the penetration depth is 300 μm, which is better than the effect of conventional ion nitriding for 8 hours. The surface hardness and depth of the nitrided layer of 38CrMoAl steel sample after plasma nitriding with titanium catalyst are significantly higher than that of conventional plasma nitriding. The addition of titanium can promote the enrichment of alloying elements to the surface, which is conducive to surface alloying, nitriding efficiency improvement, and nitriding effect enhancement. |
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