Microstructure and high-temperature oxidation resistance of NiCrAlSi composite coating on Ti6Al4V alloy by laser cladding

被引：0
|
作者：
Xu J.-N. [1 ]
Liu X.-B. [1 ,2 ]
Qiao S.-J. [1 ]
Zhai Y.-J. [1 ]
Tu R. [2 ]
机构：
[1] School of Mechanical and Electric Engineering, Soochow University, Suzhou
[2] State Key Laboratory of Advanced Technology for Materials Synthesis Processing, Wuhan University of Technology, Wuhan
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2018年 / 28卷 / 01期
关键词：
Composite coating; High temperature oxidation; Laser cladding; Microstructure;
D O I：
10.19476/j.ysxb.1004.0609.2018.01.06
中图分类号：
学科分类号：
摘要：
In order to enhance the high-temperature oxidation resistance of Ti6Al4V alloy, Ni80Cr20-40Al-20Si (mass fraction, %) precursor mixed powders were adopted to prepare the protective composite coating on Ti6Al4V alloy by laser cladding. The phase compositions, microstructure and high temperature oxidation resistance of the composite coating were investigated, and the corresponding mechanisms were discussed. The results indicate that the coating which has metallurgical bonding with the substrate, has few pores, and is crack free, and mainly consists of primary Ti5Si3/Al3Ni2 reinforced particles and the inter-primary Al3Ti/NiTi intermetallic compounds matrix. The composite coating can form dense oxide scale consisting of Al2O3 and NiO on the surface, the oxidation dynamic curve is approaching parabolic, indicating good high-temperature oxidation resistance, after isothermal oxidation test at 800℃ for 32 h. While the Ti6Al4V alloy is oxidized severely because of the high affinity of Ti atoms to O atoms and the non-protective oxide scales of TiO2. Laser cladding NiCrAlSi composite coating is a promising way to improve the oxidation resistance of Ti6Al4V alloy. © 2018, Science Press. All right reserved.
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页码：46 / 52
页数：6
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