| LU Shi-jing,SUN Fei,MIAO Xiao-ji,HU Jing.Preparation for Deep Nitriding Austenitic Stainless Steel by Complex Treatment of Plasma Nitriding and Solid Solution[J],47(10):180-185 |
| Preparation for Deep Nitriding Austenitic Stainless Steel by Complex Treatment of Plasma Nitriding and Solid Solution |
| Received:March 13, 2018 Revised:October 20, 2018 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2018.10.024 |
| KeyWord:plasma nitriding solution treatment XRD deep nitriding austenitic stainless steel wear resistance corrosion resistance |
| Author | Institution |
| LU Shi-jing |
1.Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou , China |
| SUN Fei |
2.Department of Mechanical Engineering, Changzhou Institute of Light Industry Technology, Changzhou , China |
| MIAO Xiao-ji |
2.Department of Mechanical Engineering, Changzhou Institute of Light Industry Technology, Changzhou , China |
| HU Jing |
1.Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou , China;2.Department of Mechanical Engineering, Changzhou Institute of Light Industry Technology, Changzhou , China |
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| Abstract: |
| The work aims to prepare deep nitriding austenitic stainless steel by a complex treatment of plasma nitriding and solid solution and then obtain the austenitic stainless steel with excellent comprehensive performance of hardness, corrosion re-sistance and wear resistance. 304 austenitic stainless steel was put in a LD-8CL D.C. plasma nitriding furnace and plasma nitriding treatment was conducted at 560 ℃ for 4 h in 400 Pa. Then, solid solution was carried out at 1050 ℃ for 8 h. In order to verify the applicability to get excellent comprehensive performance for stainless steel by this complex treatment, cross-sectional hardness profile, microstructure, phase constituents, surface composition, corrosion resistance and wear resistance of 304 stainless steel after the complex treatment were investigated and analyzed by HXD-1000TMC microhardness tester, DMI-3000M metallographic microscope, D/max-2500 X-ray diffraction (XRD), Thermo250XI X-ray photoelectron spectroscopy (XPS), CS 350 electrochemical workstation and universal friction tester. The stainless steel through complex treatment had single expanded austenite phase (γN) and the nitrogen atomic concentration was 1.56%. The corresponding peaks of γN shifted to the left to the stainless steel substrate. The effective hardening layer was 1.0 mm, and the surface hardness of the stainless steel increased from 210HV0.025 to 308HV0.025. Meanwhile, the complex treatment could improve the wear resistance and corrosion resistance of deep nitriding austenitic stainless steel. The corrosion potential increased from -0.534 V to -0.422 V and the friction coefficient of the nitrogenous steel decreased from 0.8 to 0.7. Complex treatment of plasma nitriding and solid solution can be used to prepare the deep nitriding stainless steel with excellent comprehensive performance. During technology design, appropriate solid solution parameters can be selected to prepare the nitriding stainless steel in conformity with various comprehensive performances based on the technical requirements of the components. |
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