【摘要】 本文研究了在低碳钢表面激光熔覆纳米TiAl合金涂层的显微组织,以探索纳米材料在表面工程领域中的应用。研究结果表明低碳钢表面激光熔覆纳米TiAl合金涂层熔区组织仍为钢基组织,但熔区的晶粒大小仅为0 .8μm～1.2 μm ,比不用纳米TiAl合金的熔区晶粒约小一个数量级;在熔区的最表层形成了一新的致密的薄层组织(约为1μm)。低碳钢表面激光熔覆纳米TiAl合金涂层中形成细小的晶粒组织和致密的氧化物可以显著地提高其力学性能(硬度)和耐腐蚀性能。更多还原

【Abstract】 The microstructure of nano-TiAl coating on low carbon steel surface processed through laser melting was studied in this paper.Experimental results show that the microstructure was still maintained steel-based,and the grain size of the melt was 0.8-1.2μm,which is much less than the grain size obtained without nano-TiAl.A dense and thin layered structure was formed in the surface of the molten zone.The fine grains and dense layered structure can remarkably improve the mechanical properties and corrosion-resistant properties.更多还原