Experimental Study of the Microstructure and Micromechanical Properties of Laser Cladded Ni-based Amorphous Composite Coatings

被引：13
作者：
Li, Ruifeng [1 ]
Zheng, Qichi [1 ]
Zhu, Yanyan [2 ]
Li, Zhuguo [2 ]
Feng, Kai [2 ]
Liu, Chuan [1 ]
机构：
[1] Jiangsu Univ Sci & Technol, Sch Mat Sci & Engn, Zhenjiang 212003, Jiangsu, Peoples R China
[2] Shanghai Jiao Tong Univ, Shanghai Key Lab Mat Laser Proc & Modificat, Shanghai 200240, Peoples R China
来源：
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2018年 / 27卷 / 01期
基金：
中国博士后科学基金; 中国国家自然科学基金;
关键词：
amorphous; laser cladding; microhardness; NbC particle; nanoindentation; METALLIC GLASSES; RESISTANCE; CORROSION; ALLOYS; PHASE;
D O I：
10.1007/s11665-017-3066-z
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
(Ni0.6Fe0.4)(65)B18Si10Nb4C3 amorphous composite coating was successfully fabricated on AISI 1045 steel substrate by using laser cladding process with coaxial powder feeding equipment. The microstructure and phase distribution of the coating were investigated by using x-ray diffraction, scanning electron microscopy and transmission electron microscope. The mechanical properties of the coating were examined by using microhardness testing and nanoindentation. The experimental results indicated that the volume fraction of amorphous phase increased with the decrease in laser cladding heat input, leading to an improvement of mean microhardness and nanohardness. NbC particles in a size ranging between 150 and 1650 nm were found embedding in the amorphous composite coatings in all situations. The presence of the NbC particles can contribute to an improvement of 96.7 HV in hardness on the basis of experimental results, while theoretical prediction suggests an improvement of 92.5 HV by using Orowan-Ashby equation.
引用
收藏
页码：80 / 88
页数：9
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