By means of x-ray diffraction apparatus, scanning electronic mocroscopy, x-ray energy spectrum meter and erosiontester, the
microstiucture and properties of Ni/Cr3C2,/(Ni + Cr) composite layer cladded by laser on 2Crl3 martensiticstainless steel n1atrix are imyestigated. Test results show that, adding and complete dissolving of Cr3C2 partic1es increasethe
content of Cr and C in the molten bath, and result in the separation of M7C3 compounds during solidification of the alloy. -Yhe hardened surfaces are composed of dense austenite(Y) dendrites surmunded by a Y-M7C3 eutectic, and the dendntes are fine and d1eir hardness values
increase 1vitLh the increase of the content of C1trC2 particles in the clad layer. Themicrohardness of the ha1dened su1fi1ces is twice as large as 2Crl3 steel. in the acid sandy slurry, under the condition ofa fixed impact of 45" and a impact velocit of 7 ~ 9 .5m/s, the clad layer is stiengthened by Ni + 5O% Cr3C2, and itserosion late is leduced by about 50% compared with that of 2Crl3 matrix.