TY - GEN
T1 - Microstructure and corrosion behaviour of TiC reinforced duplex stainless steels matrix composites sythesized by laser melt injection
AU - Obadele, Babatunde
AU - Olubambi, Peter
AU - Johnson, Oluwagbenga
PY - 2012
Y1 - 2012
N2 - The microstructure and corrosion behaviour of titanium carbide (TiC) reinforced duplex stainless steel matrix surface composites synthesized by laser melt injection technique was investigated. The surface melting operation was conducted using a 4.4 kW CW Nd:YAG laser with laser power of 1.5 kW, scanning speed of 0.4 to 1.0 m/min, beam size of 3 mm and argon shield gas flow rate of 4 L/min. The morphologies and microstructures of the coatings examined using field emission gun scanning electron microscope (FEGSEM) revealed homogeneous distribution of fine precipitates of TiC in the matrix, while X-ray diffraction (XRD) analysis confirm no phase change. TiC addition to the steels significantly increased hardness value to about 547 Hv 0.1 but slightly decreased the corrosion resistance of the steels in 3.5% NaCl possibly due to the inter-granular carbide coating that prevented chromium from forming continuous passive oxide layers.
AB - The microstructure and corrosion behaviour of titanium carbide (TiC) reinforced duplex stainless steel matrix surface composites synthesized by laser melt injection technique was investigated. The surface melting operation was conducted using a 4.4 kW CW Nd:YAG laser with laser power of 1.5 kW, scanning speed of 0.4 to 1.0 m/min, beam size of 3 mm and argon shield gas flow rate of 4 L/min. The morphologies and microstructures of the coatings examined using field emission gun scanning electron microscope (FEGSEM) revealed homogeneous distribution of fine precipitates of TiC in the matrix, while X-ray diffraction (XRD) analysis confirm no phase change. TiC addition to the steels significantly increased hardness value to about 547 Hv 0.1 but slightly decreased the corrosion resistance of the steels in 3.5% NaCl possibly due to the inter-granular carbide coating that prevented chromium from forming continuous passive oxide layers.
KW - Duplex steels
KW - Laser melt injection
KW - Titanium carbide
UR - http://www.scopus.com/inward/record.url?scp=84860788097&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84860788097
SN - 9781118291405
T3 - TMS Annual Meeting
SP - 33
EP - 40
BT - Extraction and Processing Division - 2012 EPD Congress - Held During the TMS 2012 Annual Meeting and Exhibition
T2 - 2012 EPD Congress - TMS 2012 Annual Meeting and Exhibition
Y2 - 11 March 2012 through 15 March 2012
ER -