Phase Stability and Microstructure Evolution of Solution-Hardened 316L Powder Feedstock for Thermal Spraying
A solution-hardening of AISI 316L stainless-steel powder was conducted. The expansion of the crystal lattice and a strong increase in the nanoindentation hardness confirm the successful diffusion of carbon and nitrogen in the interstices. A multiphase state of the powder feedstock with phase fractio...
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| Format: | Article |
| Language: | English |
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MDPI AG
2018-12-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/8/12/1063 |
| _version_ | 1818173899307745280 |
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| author | Thomas Lindner Martin Löbel Thomas Lampke |
| author_facet | Thomas Lindner Martin Löbel Thomas Lampke |
| author_sort | Thomas Lindner |
| collection | DOAJ |
| description | A solution-hardening of AISI 316L stainless-steel powder was conducted. The expansion of the crystal lattice and a strong increase in the nanoindentation hardness confirm the successful diffusion of carbon and nitrogen in the interstices. A multiphase state of the powder feedstock with phase fractions of the metastable S-phase (expanded austenite) mainly at the particle’s edge, and the initial austenitic phase within the core was found. Thermal spraying using high velocity oxy-fuel (HVOF) and atmospheric plasma spraying (APS) prove the sufficient thermal stability of the Sphase. Microstructural investigations of the HVOF coating reveal the ductility of the S-phase layer, while the higher heat load within the APS cause diffusion processes with the initial austenitic phase. The lattice expansion and the nanoindentation hardness decrease during thermal spraying. However, the absence of precipitates ensures the sufficient heat stability of the metastable S-phase. Even though further efforts are required for the thermochemical treatment of powder feedstock, the results confirm the feasibility of the novel powder treatment approach. |
| first_indexed | 2024-12-11T19:35:50Z |
| format | Article |
| id | doaj.art-37f9489994a149c1b0ad5e8e967e5d61 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-12-11T19:35:50Z |
| publishDate | 2018-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-37f9489994a149c1b0ad5e8e967e5d612022-12-22T00:53:09ZengMDPI AGMetals2075-47012018-12-01812106310.3390/met8121063met8121063Phase Stability and Microstructure Evolution of Solution-Hardened 316L Powder Feedstock for Thermal SprayingThomas Lindner0Martin Löbel1Thomas Lampke2Materials and Surface Engineering Group, Institute of Materials Science and Engineering, Chemnitz University of Technology, D-09107 Chemnitz, GermanyMaterials and Surface Engineering Group, Institute of Materials Science and Engineering, Chemnitz University of Technology, D-09107 Chemnitz, GermanyMaterials and Surface Engineering Group, Institute of Materials Science and Engineering, Chemnitz University of Technology, D-09107 Chemnitz, GermanyA solution-hardening of AISI 316L stainless-steel powder was conducted. The expansion of the crystal lattice and a strong increase in the nanoindentation hardness confirm the successful diffusion of carbon and nitrogen in the interstices. A multiphase state of the powder feedstock with phase fractions of the metastable S-phase (expanded austenite) mainly at the particle’s edge, and the initial austenitic phase within the core was found. Thermal spraying using high velocity oxy-fuel (HVOF) and atmospheric plasma spraying (APS) prove the sufficient thermal stability of the Sphase. Microstructural investigations of the HVOF coating reveal the ductility of the S-phase layer, while the higher heat load within the APS cause diffusion processes with the initial austenitic phase. The lattice expansion and the nanoindentation hardness decrease during thermal spraying. However, the absence of precipitates ensures the sufficient heat stability of the metastable S-phase. Even though further efforts are required for the thermochemical treatment of powder feedstock, the results confirm the feasibility of the novel powder treatment approach.https://www.mdpi.com/2075-4701/8/12/1063thermal sprayingHVOFAPSS-phaseexpanded austenite316Lstainless steelthermochemical treatmenthardeninggas nitrocarburization |
| spellingShingle | Thomas Lindner Martin Löbel Thomas Lampke Phase Stability and Microstructure Evolution of Solution-Hardened 316L Powder Feedstock for Thermal Spraying Metals thermal spraying HVOF APS S-phase expanded austenite 316L stainless steel thermochemical treatment hardening gas nitrocarburization |
| title | Phase Stability and Microstructure Evolution of Solution-Hardened 316L Powder Feedstock for Thermal Spraying |
| title_full | Phase Stability and Microstructure Evolution of Solution-Hardened 316L Powder Feedstock for Thermal Spraying |
| title_fullStr | Phase Stability and Microstructure Evolution of Solution-Hardened 316L Powder Feedstock for Thermal Spraying |
| title_full_unstemmed | Phase Stability and Microstructure Evolution of Solution-Hardened 316L Powder Feedstock for Thermal Spraying |
| title_short | Phase Stability and Microstructure Evolution of Solution-Hardened 316L Powder Feedstock for Thermal Spraying |
| title_sort | phase stability and microstructure evolution of solution hardened 316l powder feedstock for thermal spraying |
| topic | thermal spraying HVOF APS S-phase expanded austenite 316L stainless steel thermochemical treatment hardening gas nitrocarburization |
| url | https://www.mdpi.com/2075-4701/8/12/1063 |
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