摘要
为了提高Ti6Al4V表面激光熔覆Ni+TiB_(2)复合涂层的耐磨性,研究了粉末配比对涂层组织和力学性能的影响。激光熔覆层主要由TiB,TiB_(2),α-Ti, β-Ti, NiTi合金固溶体和TiO2组成,熔覆层主要由黑色椭圆相、细长针状相和周围的胞晶相组成。黑色椭圆相为TiB_(2),针状相为TiB,周围细胞晶相为NiTi。随着TiB_(2)添加量的增加,TiB含量增加,TiB金相颗粒变粗。熔覆层显微硬度最高达到920.8HV1.0,约为Ti6Al4V合金的3倍,显微硬度的升高可以提高熔覆层的耐磨性能。随着载荷的增加,复合涂层的脆性剥落越来越严重,不适合高载荷条件。
In order to improve the wear resistance performance laser cladded Ni+TiB_(2) composite coating prepared on Ti6Al4V surface,the influence of powder ratio on microstructure and mechanical properties is studied.The laser cladding coating is mainly composed of TiB,TiB_(2),α-Ti,β-Ti,NiTi alloy solid solution and TiO 2.The cladding layer is mainly composed of black elliptic phase,elongated needle-like phase and surrounding cell crystal phase.The black elliptic phase,needle-like phase and surrounding cell crystal phase are TiB_(2),TiB,NiTi,respectively.When the TiB_(2) additive amount content increases,the TiB content increases,the TiB metallographic particles become coarse.The highest microhardness of the cladding layer reaches 920.8 HV 1.0,which is about 3 times that of the Ti6Al4V alloy,the increased microhardness improves the wear resistance properties of the cladding coating.The brittle spalling becomes more serious with the load increasing,and the composite coating is not suitable for high load conditions.
作者
廖君慧
孙富建
刘奕梁
朱千放
Liao Junhui;Sun Fujian;Liu Yiliang;Zhu Qianfang
出处
《工具技术》
北大核心
2024年第11期17-22,共6页
Tool Engineering
基金
车用动力基础科研创新计划。
