Microstructure and Properties of Cr3C2+Ti Composite Modified Laser Clad Fe-0.3C-15Cr-1Ni Alloy
The study aims to improve the hardness and corrosion resistance of Fe-0.3C-15Cr-1Ni alloy coatings.Stainless steel-based and TiC-containing coatings with high hardness and corrosion resistance were in-situ synthesized by the laser cladding technique on the surface of 3Cr13 stainless steel substrate with different contents of(Cr3C2+Ti)(0,0.5％,1％,2％).A Metallographic microscope(OM),a scanning electron microscope(SEM),an X-ray diffractometer(XRD),a microhardness tester,an electrochemical workstation and other equipment were used to study the effects of different contents of(Cr3C2+Ti)on the microstructure,phase composition,hardness distribution and corrosion resistance of the clad layers.The results show that the interfacial metallurgical bonding between the clad layer and the 3Cr13 stainless steel matrix is good.With(Cr3C2+Ti)added,the dendrites and columnar crystals of the clad layer were changed to cytosolic and equiaxed crystals;the carbides were changed from herringbone and massive to rod and granular,from low-carbon carbides to high-carbon carbides and declined in number.With the increase of(Cr3C2+Ti)content,the hardness of the clad layer,the pitting potential and the width of the passivation zone increase first and then decrease.The results show that the addition of(Cr3C2+Ti)to Fe-0.3C-15Cr-1Ni alloy powder can significantly improve the hardness and corrosion resistance of the martensitic stainless steel-based coatings.The overall performance of the clad layer is the best when the(Cr3C2+Ti)content is 0.5％.
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