Surface Modification of Ti-6Al-4V Alloy by Pack Boronizing
A pack bonding technique was employed to obtain a hard coating on the surface of Ti-6Al-4V alloy in this paper. The diffusion process was carried out at various temperatures ranging from 1000℃ to 1100℃ for various periods of time ranging from 5 to 20 hours. The microstructure, morphology and the phase composition of Ti-6Al-4V alloy after bonding were investigated. The diffusion behavior of Ti, Al, V, B elements in boronizing process was also discussed. It was showed that the thickness of diffusion layer ranged from 0.8μm to 15μm based on the bonding parameters. The TiB-TiB2 biphasic boron-titanium compounds layer were formed on the surface of Ti-6Al-4V alloy. The X-ray diffraction (XRD) patterns of the coatings revealed that the peak position of TiB and TiB2 increased with temperature rising. Furthermore, the surface B atoms reacted with Ti of Ti-6Al-4V matrix that led to the reduction of Ti in transition region. The microhardness value of TiB2 to TiB was gradient distribution ranged from 2200HV0.01 to 1100HV0.01- And the hardness value in the transition region was higher than the Ti-6Al-4V matrix.
pack boronizing Ti-6Al-4V alloy boron-titanium compounds microhardness
YI Xiao-hong FAN Zhan-guo ZHANG Jing-lei LI Feng-hua
School of Materials and Metallurgy,Northeastern University,Shenyang,China
国际会议
The Fourth Asian Conference on Heat Treatment and Surface Engineering(第四届亚洲热处理及表面工程大会)
北京
英文
391-395
2009-10-27（万方平台首次上网日期，不代表论文的发表时间）