Effect of Cr3C2 Content on Microstructure and Properties of Laser Cladding Ti(C, B)/Ni Coatings

In order to solve the problems of low hardness and poor wear resistance of titanium alloy, laser cladding technology was used to prepare Ti(C,B)/Ni coatings with different amount of Cr 3 C 2 on the surface of Ti-6Al-4V titanium alloy. The effects of Cr 3 C 2 content on the microstructure, hardness a...

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Vydáno v:Journal of materials engineering and performance Ročník 31; číslo 7; s. 5189 - 5200
Hlavní autoři: Yunlong, Liang, Hanguang, Fu, Zhenguo, Xing, Xingye, Guo, Jian, Lin
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York Springer US 01.07.2022
Témata:
Characterization and Evaluation of Materials
Chemistry and Materials Science
Corrosion and Coatings
Engineering Design
Materials Science
Quality Control
Reliability
Safety and Risk
Technical Article
Tribology
hardness
C
laser cladding
microstructure
wear resistance
Ti(C,B)/Ni coatings
Cr
addition
TiC
ISSN:1059-9495, 1544-1024
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Shrnutí:In order to solve the problems of low hardness and poor wear resistance of titanium alloy, laser cladding technology was used to prepare Ti(C,B)/Ni coatings with different amount of Cr 3 C 2 on the surface of Ti-6Al-4V titanium alloy. The effects of Cr 3 C 2 content on the microstructure, hardness and wear resistance of Ti(C,B)/Ni coating were investigated by methods of scanning electron microscope (SEM), x-ray diffractometer (XRD), microhardness tester and M-200 wear tester. The results showed that phases existing in coating mainly contain γ-Ni, Ni 3 Ti, NiTi, TiB 2 , Ti(C,B) and CrB. With the increase of Cr 3 C 2 content, the size and number of black bulk precipitates in the coating reduced. Meanwhile, the short rod-like Ti(C,B) particles grew and the amount of the particles increased, and Ti(C,B) particles existed in the form of cellular dendritic crystals in the coating. The average microhardness of the cladding layer without Cr 3 C 2 addition is 896.7 HV 0.2 , which is about 1.5 times higher than that of Ti-6Al-4V substrate (360 HV 0.2 ). With the increase of Cr 3 C 2 content (10, 20, 30 wt.%), the average microhardness of the coating increased to 948.7, 990.4 and 1035.8 HV 0.2 , respectively. The average hardness of the coating added 30 wt.%Cr 3 C 2 is 15.5% higher than that of the Cr 3 C 2 -free coating. At the same time, the wear resistance increased with the increase of Cr 3 C 2 content.
ISSN:1059-9495
1544-1024
DOI:10.1007/s11665-022-06604-y