Microstructure and Properties of Coating of Ni35 Powder Doped with High Carbon Ferrochrome Powder by Laser Cladding

作者：Li Gang; Zhang Jingbo^*; Wen Ying; Liang Yanhui; Wang Siqi; Yuan Juan

来源：Rare Metal Materials and Engineering, 2018, 47(6): 1830-1835.

• laser cladding
• high carbon ferrochrome
• microstructure
• corrosion resistance

The coatings of Ni35 powder doped with different mass fractions (0%, 25%, 50%, 75% and 100%) of high carbon ferrochrome powder were prepared on the surface of 27SiMn steel using a laser cladding technique. The microstructure and the phase of the laser cladding layers were studied by OM, SEM, EDS and XRD. The mechanical and corrosion properties of the laser cladding layers were studied by micro-hardness tester, abrasive wear machine and electrochemical corrosion tester. The results show that the phases of the cladding layers without high carbon ferrochrome are gamma-Ni, FeNi3 and Cr2Ni3. When the content of carbon ferrochrome is 50%, alpha-Cr and (Cr, Fe)(7)C-3 is generated while Cr2Ni3 disappears. With increasing the content of high carbon ferrochrome, the lath microstructures increase and coarsen constantly. When the content is 50%, Cr element enrichment happens in the petal-looking microstructure of the upper cladding layer and the lath microstructure of the middle cladding layer, and the light gray microstructure is gamma-Ni. And with the content increasing, the micro-hardness increases while the wear rate declines. When the content is 25%, the maximum dilution rate is 20.80% and when the content is 50%, the cladding layer has the best corrosion resistance, and the least corrosion current density, which is similar to 0.39 mu A/cm(2).

• 出版日期2018-6
• 单位辽宁工程技术大学