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| Surface Chromizing and Nitriding Treatment of 316L Stainless Steel and Its Wear Resistance |
| Received:November 12, 2024 Revised:February 27, 2025 |
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| DOI：10.7643/issn.1672-9242.2025.04.019 |
| KeyWord:chromizing 316L steel vacuum chemical heat treatment glow ion nitriding CrN film deep hole coating |
| Author | Institution |
| CHEN Sheng |
The Fifth Military Representative Office in Chongqing, Chongqing , China |
| LIU Jie |
State-run No.296 Factory, Cho ngqing , China |
| LIU Jing |
Southwest Institute of Technology and Engineering, Chongqing , China |
| PENG Xiaoming |
The Third Military Representative Office in Chongqing, Chongqing , China |
| ZHAO Yu |
The Fifth Military Representative Office in Chongqing, Chongqing , China |
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| Abstract: |
| The work aims to optimize physical properties of the chromium nitride film on the 316L steel surface to find a solution to the problem of inner wall coating of deep hole workpieces. Vacuum chemical thermal treatment technology and glow ion nitriding technology were used to prepare a chromium nitride (CrN) film on the substrate 316L steel to explore the physical properties such as thickness, metallographic organization, microcosmic morphology, hardness, and wear resistance of the chromium nitride film. The chromizing and nitriding technology was used to coat the inner wall of the deep hole workpieces (pore ratio of 1:10), and detect the micro and macro characteristics of the inner holes of the workpieces. This article determined the best conditions for chromium nitride layer preparation by exploring different reaction conditions, such as temperature, time and ammonia flow. Under the best reaction conditions, a CrN film with a thickness of 93.28 μm was formed on the surface of 316L steel. The grain boundary was still obvious at 620 ℃, and there was no “intergranular corrosion” phenomenon. The hardness of film could reach 1 306HV0.1, and the coefficient of friction was 0.15. After chromizing and nitriding treatment, the inner hole of the deep hole workpieces had a relatively uniform infiltration layer with a thickness of 1.47 μm. The use of vacuum chemical head treatment and glow ion nitriding technology to form a CrN layer on the surface of 316L steel effectively improves the surface hardness and wear resistance of 316L steel. The chromizing and nitriding technology can provide technical support for the coating of small arms, especially for deep hole workpieces. |
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