光束反应合成碳化物增强的镍基合金堆焊层

以镍基合金粉Ni35、铬粉和石墨为堆焊材料,用光束反应合成的方法制备了碳化物增强的镍基合金堆焊层,研究了堆焊材料组成对堆焊层显微组织及宏观硬度的影响规律.结果表明,在镍基合金粉中加入铬粉和石墨,堆焊层中析出了一次碳化物,可显著提高堆焊层的宏观硬度;随铬粉和石墨加入量的增加,堆焊层中一次碳化物的析出量随之增加,堆焊层的宏观硬度相应提高,最高可达62 HRC,是镍基合金粉光束堆焊层的2.8倍;但加入过多的铬粉和石墨将恶化堆焊层的成形.

Carbide-reinforced Ni-based Alloy Surfacing Layer Synthesized by Light Beam Heating

With the Ni-based alloy powder, Cr powder and graphite as surfacing materials, the carbide-reinforced Ni-based alloy surfacing layer was reaction synthesized by light beam heating. The influence of the composition of surfacing material on the microstructure and hardness of surfacing layer was investigated. The results showed that adding Cr powder and graphite to Ni-based alloy powder can yield primary carbide precipitate in the surfacing layer, which obviously increases its hardness. With the increase of Cr powder and graphite content, the precipitated carbides increase, and the hardness of surfacing layer raises. The hardness of Carbide-reinforced Ni-based alloy surfacing layer can reach to 62 HRC, about 2.8 times that of the plain Ni-based alloy surfacing layer. Excess Cr powder and graphite will result in the poor shape of surfacing layer.