时效处理对WC/Cu-Ni-Mn堆焊层耐磨损性能影响

Influence of age-hardening treatment on anti-wear performance of WC/Cu-Ni-Mn hardfacing coatings

关键词:  铜镍锰金属基|碳化钨增强耐磨堆焊层|时效处理|耐磨损性能|磨损机理

Key words:  Cu-Ni-Mn metal matrix|WC-reinforced hardfacing coating|age-hardening treatment|anti-wear performance|wear mechanism

摘要:

通过对比未时效与时效后WC/Cu-Ni-Mn堆焊层的微观组织、界面及耐磨损性能，研究时效处理对其耐磨损性能的影响规律，并揭示其耐磨损机理. 结果表明，未时效和时效后的WC/Cu-Ni-Mn涂层相对耐磨损性能分别是时效后Cu-Ni-Mn基体的170.72和210.77倍，时效后涂层耐磨性能提升了23.5%；时效处理后Cu-Ni-Mn金属基中析出了NiMn第二相，基体硬度提升了2.3倍，从而为WC颗粒增强相提供了更稳定支撑；而未时效的Cu-Ni-Mn合金中Ni，Mn原子固溶到Cu晶格，形成了一种α-Cu固溶体；未时效和时效后WC/Cu-Ni-Mn的主要磨损机理均为磨粒磨损和黏着磨损.

Abstract:

The microstructure, interface and anti-wear performance of WC/Cu-Ni-Mn hardfacing coatings with and without age-hardening were compared and analyzed. The influence of the aging treatment on the anti-wear performance and wear mechanisms of WC/Cu-Ni-Mn coatings were investigated. The results showed that relative wear-resistances of WC/Cu-Ni-Mn hardfacing coatings with and without age-hardening treatment were 170.72 and 210.77 times as much as the aged Cu-Ni-Mn matrix, which increased by 23.5%. After aging, the NiMn phase precipitated in the Cu-Ni-Mn alloy and its hardness increased by 2.3 times. As for the Cu-Ni-Mn metal matrix without the age-hardening, the elements of Ni and Mn dissolved in copper and then formed the α-Cu solid solutions. The main wear mechanisms of coating with and without age-hardening were adhesion and abrasion.