Laser surface hardening of 11% Cr ferritic stainless steel and its sensitisation behaviour
| Autor: | Timo Manninen, Alexander Kaplan, Hannu-Pekka Heikkinen, Jesper Sundqvist, Severi Anttila |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0209 industrial biotechnology
Materials science Metallurgy 02 engineering and technology Surfaces and Interfaces General Chemistry Lath engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure Hardness Surfaces Coatings and Films Corrosion Carbide 020901 industrial engineering & automation Ferrite (iron) Martensite Materials Chemistry Hardening (metallurgy) engineering 0210 nano-technology |
| Zdroj: | Surface and Coatings Technology. 344:673-679 |
| ISSN: | 0257-8972 |
| Popis: | 11% Cr ferritic stainless steel conforming to EN 1.4003 standard was surface hardened by a continuous-wave fibre laser beam. Both single-pass and multi-pass laser hardening was investigated. Different laser parameters were compared and their influence on hardness, microstructure, geometry of the hardened zone and sensitisation was investigated, especially for overlapping passes. The experiments showed that a surface hardness which is double that of the base material hardness was obtainable via martensitic phase transformation and high cooling rate, in spite of the low carbon and nitrogen content. This behaviour could be predicted from the chemical composition using the Kaltenhauser Ferrite Factor. Hardening at higher power levels gives more coarse-grained lath martensite but does not increase the hardness. Sensitisation was not a problem in single-pass hardening. However, the production of overlapping tracks could be detrimental to corrosion resistance in 11% Cr steel due to the formation of chromium carbides and nitrides. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect