激光熔敷Ni基合金涂层的结构与性能  

Investigation on structure and properties of laser remelting Ni-base alloy coatings

作　　者：高阳[1] 佟百运[2] 梁勇[2] 

机构地区：[1]清华大学 [2]中国科学院金属研究所

出　　处：《材料研究学报》2003年第1期87-91,共5页Chinese Journal of Materials Research

基　　金：国家自然科学基金59971025

摘　　要：观测了激光熔敷NiCrBSi合金涂层的显微结构,研究了涂层与不锈钢基体的结合方式和时效处理对其组织结构和显微硬度的影响.用5kW连续二氧化碳激光器对不锈钢上等离子喷涂NiCrBSi合金层进行重熔。涂层的显微结构为细化树枝晶,由γ基体与γ/γ＇和NiB的共晶组成。面心立方γ基体晶格常数是0.3572nm。时效处理后的合金层由析出γ＇沉淀强化相的针状和羽毛状马氏体组成,时效使显微硬度值显著提高。A 5 kW CW CO2 laser was utilized to prepare NiCrBSi alloy coatings on stainless steel. Powders were prepared by plasma-spraying. The microstructure of the coatings are fine dendrites, which are composed of γ matrix phases and eutectic phases including γ/γ' and NiB phases, lattice parameter of fcc γ matrix is 0.3572 nm. The coating process provides a route to refine microstructure, as laser scanning speed increases from 5 to 20 mm/s, the space between dendrites decreases from 10 to 3.8 μm. NiCrBSi coatings after ageing treatment were composed of pinhole and plumy martensite, the precipitation of γ' phase increases the microhardness values of alloy coatings.

关 键 词：激光熔敷 镍基合金涂层 不锈钢基体 显微结构 显微硬度 气蚀 磨损 防护 

分 类 号：TG174.44[金属学及工艺—金属表面处理]