Abstract
Homogeneous reinforcement particles distribution in the metal matrix is an important factor for obtaining high quality metal matrix composites (MMCs) with superior properties. Laser particle injection of AISI 304L austenitic stainless steel (ASS) was carried out with TiC as reinforcement powder. Characterization of MMCs fabricated was carried out using optical microscopy (OM), scanning electron microscopy (SEM) and Xray diffraction (XRD) analyses. The effects of varying laser power and scan speed on the microstructure, hardness and corrosion properties evolved were investigated. Experimental results indicated that at scan speed of 0.6 m/min and laser power of 2.0 kW the MMC produced revealed a uniform distribution of TiC particulates in the modified zone, this sample also displayed significant increase in microhardness which is twice that of the AISI 304L stainless steel substrate. The injection of TiC particles to 304L ASS increased the presence of Ti/Cr rich carbides in the microstructure and this reduces the corrosion resistance. However, sample produced at a laser power 1.5 kW and scan speed 1.2 m/min, showed a positive shift in Ecorr, and this was attributed to the lowest powder fraction of TiC in the MMC.
| Original language | English |
|---|---|
| Pages (from-to) | 1245-1252 |
| Number of pages | 8 |
| Journal | Digest Journal of Nanomaterials and Biostructures |
| Volume | 7 |
| Issue number | 3 |
| Publication status | Published - 2012 |
| Externally published | Yes |
Keywords
- Corrosion
- Hardness
- Laser
- Microstructure
ASJC Scopus subject areas
- Structural Biology
- Atomic and Molecular Physics, and Optics
- Biomedical Engineering
- General Materials Science
- Condensed Matter Physics
- Physical and Theoretical Chemistry