【摘要】 对Cr3C2/Ni3Al复合堆焊合金层的元素分布、横截面组织和硬度等进行分析和研究。结果表明,堆焊过程中,母材表面半熔化区的形成使堆焊层与母材实现冶金结合,堆焊层金属逆热流方向与母材呈联生方式长大,形成Cr3C2强化的Ni3Al基堆焊层;Ni3Al基体对Cr3C2起到保护和支撑作用,弥散分布的硬质强化相Cr3C2,硬度高,抗磨损性好,显著提高堆焊层硬度,并对Ni3Al基体起保护作用;堆焊层与母材冶金结合,无裂纹,不易剥落,使得部件整体的耐磨性能提高。更多还原

【Abstract】 Elements distribution,microstructure of the cross-section surface and the hardness of the Cr3C2/Ni3Al hardfacing alloy layer were studied.The results show that,in the welding process,surfacing layer and the base metal is metallurgically bonded by the forma-tion of partially melted zone on base metal surface,the hardfacing layer of Ni3Al strengthened by Cr3C2 is formed against the direction of heat flow which showes adnate growing style with base metal;The matrix of Ni3Al can protect and hold-up the Cr3C2,and the matrix of Ni3Al is protected and the hardness of hardfacing layer increases significantly because of the dispersed distribution of Cr3C2 which has high hardness and good wear-resistance;The improvement of the wear-resistance in the whole component due to good metallurgi-cal combination of hardfacing layer and base metal,crack-free,so the hardfacing alloy layer can not exfoliate easily,thus improving the wear-resistance.更多还原