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Effect of Quench Polish Quench Nitriding Temperature on the Microstructure and Wear Resistance of SAF2906 Duplex Stainless Steel

1
School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350116, China
2
Jinjiang Science and Education Park, Fuzhou University, Jinjiang 362251, China
3
Department of Advanced Production Engineering, Engineering and Technology Institute Groningen, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands
4
State Key Laboratory of Materials Processing and Die & Mould Technology, Huazhong University of Science and Technology, Wuhan 430074, China
*
Author to whom correspondence should be addressed.
Metals 2019, 9(8), 848; https://doi.org/10.3390/met9080848
Received: 19 June 2019 / Revised: 25 July 2019 / Accepted: 30 July 2019 / Published: 31 July 2019
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Abstract

The effect of quench polish quench (QPQ) nitriding temperature on the microstructure and wear resistance of SAF2906 duplex stainless steel was investigated. Results showed the surface of the nitrided samples was composed of an oxidized layer, a loose compound layer, a compact compound layer, and a diffusion layer. The oxidized layer was composed of Fe3O4. The main phases of the loose compound layer were CrN, αN, Fe2–3N, and Fe3O4. The compact compound layer was composed of CrN, αN, and Fe2–3N. In the diffusion layer, CrN and expanded austenite (S) were the main phases. The nitrided layer thickness increased from 20 to 41 μm with an increasing temperature of 570 to 610 °C. When the nitriding temperature was above 590 °C, the precipitates in the diffusion layer became coarsened, and their morphologies gradually changed from spherical particulate to rod-like and flocculent-like. Tribotests showed the cumulative mass loss of QPQ-treated samples was much lower than that of the substrate. The cumulative mass loss of the samples nitrided at 610 °C was higher than that at 570 °C during the first 29 h. When the test time was over 29 h, the former was lower than the latter. View Full-Text
Keywords: SAF2906 duplex stainless steel; nitriding temperature; microstructure; wear resistance SAF2906 duplex stainless steel; nitriding temperature; microstructure; wear resistance
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Xiang, H.; Wu, G.; Liu, D.; Cao, H.; Dong, X. Effect of Quench Polish Quench Nitriding Temperature on the Microstructure and Wear Resistance of SAF2906 Duplex Stainless Steel. Metals 2019, 9, 848.

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