TY - JOUR
T1 - Laser surface alloying of ferritic Fe-40Cr alloy with ruthenium
AU - Tjong, S. C.
AU - Ku, J. S.
AU - Ho, N. J.
PY - 1997/4/1
Y1 - 1997/4/1
N2 - An investigation is made of the laser surface alloying of an experimental ferritic Fe-40Cr alloy with a ruthenium powder coating using a continuous wave CO2 laser. The micro structure and corrosion behaviour of the laser surface alloying layer and the Fe-40Cr bulk alloy were examined by means of scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy, microhardness, potentiodynamic and corrosion potential measurements. The results of the microstructural examination showed that fine cellular dendrites with a ruthenium content as high as 51.84wt.% were produced by laser surface alloying. The extended solubility of ruthenium in the cellular dendrites resulted in a dramatic increase of the hardness in the laser alloying layer. Potentiodynamic and open circuit corrosion potential measurements indicated that the ruthenium-containing surface layer spontaneously passivated in hydrochloric and sulphuric acid solutions, whereas the bulk Fe-40Cr alloy remained in the active state when exposed in these reducing acid solutions. © 1997 Elsevier Science S.A.
AB - An investigation is made of the laser surface alloying of an experimental ferritic Fe-40Cr alloy with a ruthenium powder coating using a continuous wave CO2 laser. The micro structure and corrosion behaviour of the laser surface alloying layer and the Fe-40Cr bulk alloy were examined by means of scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy, microhardness, potentiodynamic and corrosion potential measurements. The results of the microstructural examination showed that fine cellular dendrites with a ruthenium content as high as 51.84wt.% were produced by laser surface alloying. The extended solubility of ruthenium in the cellular dendrites resulted in a dramatic increase of the hardness in the laser alloying layer. Potentiodynamic and open circuit corrosion potential measurements indicated that the ruthenium-containing surface layer spontaneously passivated in hydrochloric and sulphuric acid solutions, whereas the bulk Fe-40Cr alloy remained in the active state when exposed in these reducing acid solutions. © 1997 Elsevier Science S.A.
KW - Fe-40Cr
KW - Laser surface alloying
KW - Ruthenium
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UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-0031123831&origin=recordpage
U2 - 10.1016/S0257-8972(96)03135-0
DO - 10.1016/S0257-8972(96)03135-0
M3 - RGC 21 - Publication in refereed journal
SN - 0257-8972
VL - 90
SP - 203
EP - 209
JO - Surface and Coatings Technology
JF - Surface and Coatings Technology
IS - 3
ER -