Laser Cladding Fe-Cr-Si-P Amorphous Coatings on 304L Stainless

The Fe-Cr-Si-P amorphous composite coatings were fabricated on 304L stainless steel by laser cladding. The microstructure, the phase composition, the microhardness, the corrosion and wear resistance of the coatings were analyzed by optical microscope (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM), a microhardness tester, an electrochemical measurement system and a friction and wear tester. The results show that the cladding coating mainly contains plum-like dendrite crystals in the surface, an amorphous in center region and a dendrite crystals in binding zone. A good metallurgical bond is obtained between the coating and substrate. Except amorphous phase, the cladding coating contains a small amount of Fe3P and Fe2Si phases. The coating has a good performance. The microhardness HV0.2 is about 8000 MPa; the Ecorr and icorr are −449.3 mV and 4.34 μA/cm2, respectively; the frictions coefficient at the load of 100 N is 0.076.