2Cr13钢表面激光熔覆Co基合金组织及其性能

Microstructure and Performance of a Laser Clad Co-Based Alloy on 2Cr13 Stainless Steel

摘要:

采用横流连续波2kW CO2激光在2Cr13不锈钢表面进行激光熔覆处理，对熔履层的组织结构、磨损及高温和PbSO4盐热腐蚀性能进行了系统研究。试验结果表明，表面激光熔覆Co基合金后，其耐磨粒磨损性能、高温PbSO4盐热腐蚀性能均提高了2.5倍以上，熔覆层的热腐蚀机制是沿晶腐蚀及硫化-氧化循环进行造成的剥落型腐蚀破坏。

Abstract:

Cr13 stainless steel was surface cladded with Co-based alloy using a high power carbon dioxide laser. The microstructure, wear resistance and corrosion properties of the clad layer were investigated. The experimental results indicate that the high temperature corrosion behaviour and wear resistant property of the clad layer are 3 and 3.5 times better than those of the parent metal. Under the high temperature molten lead sulphate salt corrosion condition, the clad layer spalls off which is caused by intergrannular corrosion in the clad layer. The fine dendritic structure and the Co-based alloy oxides help to retard the penetration rate of the sulphur ion, which induces the intergrannular corrosion.