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Article

Effect of Adjusted Gas Nitriding Parameters on Microstructure and Wear Resistance of HVOF-Sprayed AISI 316L Coatings

1
Materials and Surface Engineering Group, Institute of Materials Science and Engineering, Chemnitz University of Technology, D-09107 Chemnitz, Germany
2
Härterei Reese Chemnitz GmbH & Co. KG, 09117 Chemnitz, Germany
*
Author to whom correspondence should be addressed.
Materials 2019, 12(11), 1760; https://doi.org/10.3390/ma12111760
Received: 13 May 2019 / Revised: 24 May 2019 / Accepted: 29 May 2019 / Published: 30 May 2019
(This article belongs to the Special Issue Advances in Thermal Spray Technology)
Gas nitriding is known as a convenient process to improve the wear resistance of steel components. A precipitation-free hardening by low-temperature processes is established to retain the good corrosion resistance of stainless steel. In cases of thermal spray coatings, the interstitial solvation is achieved without an additional surface activation step. The open porosity permits the penetration of the donator media and leads to a structural diffusion. An inhomogeneous diffusion enrichment occurs at the single spray particle edges within the coating’s microstructure. A decreasing diffusion depth is found with increasing surface distance. The present study investigates an adjusted process management for low-temperature gas nitriding of high velocity oxy-fuel-sprayed AISI 316L coatings. To maintain a homogeneous diffusion depth within the coating, a pressure modulation during the process is studied. Additionally, the use of cracked gas as donator is examined. The process management is designed without an additional surface activation step. Regardless of surface distance, microstructural investigations reveal a homogeneous diffusion depth by a reduced processing time. The constant hardening depth allows a reliable prediction of the coatings’ properties. An enhanced hardness and improved wear resistance is found in comparison with the as-sprayed coating condition. View Full-Text
Keywords: thermal spraying; high velocity oxy-fuel (HVOF); S-phase; expanded austenite; 316L; stainless steel; thermochemical treatment; hardening; gas nitriding thermal spraying; high velocity oxy-fuel (HVOF); S-phase; expanded austenite; 316L; stainless steel; thermochemical treatment; hardening; gas nitriding
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MDPI and ACS Style

Kutschmann, P.; Lindner, T.; Börner, K.; Reese, U.; Lampke, T. Effect of Adjusted Gas Nitriding Parameters on Microstructure and Wear Resistance of HVOF-Sprayed AISI 316L Coatings. Materials 2019, 12, 1760. https://doi.org/10.3390/ma12111760

AMA Style

Kutschmann P, Lindner T, Börner K, Reese U, Lampke T. Effect of Adjusted Gas Nitriding Parameters on Microstructure and Wear Resistance of HVOF-Sprayed AISI 316L Coatings. Materials. 2019; 12(11):1760. https://doi.org/10.3390/ma12111760

Chicago/Turabian Style

Kutschmann, Pia, Thomas Lindner, Kristian Börner, Ulrich Reese, and Thomas Lampke. 2019. "Effect of Adjusted Gas Nitriding Parameters on Microstructure and Wear Resistance of HVOF-Sprayed AISI 316L Coatings" Materials 12, no. 11: 1760. https://doi.org/10.3390/ma12111760

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