التفاصيل البيبلوغرافية
| العنوان: |
Microstructure characterisation of in-situ synthesised TiC/Ti6Al4 V composite coating by laser cladding. |
| المؤلفون: |
Zhang, Lizheng, Zhao, Zhanyong, Bai, Peikang, Du, Wenbo, Wang, Qin, Liang, Minjie, Liao, Haihong, Li, Yuxin, Han, Bing |
| المصدر: |
Philosophical Magazine Letters; Dec2020, Vol. 100 Issue 12, p588-595, 8p |
| مصطلحات موضوعية: |
METAL cladding, COMPOSITE coating, GRAPHENE synthesis, LASERS, MICROSTRUCTURE, MARTENSITE |
| مستخلص: |
A TiC/Ti6Al4V composite coating was prepared by laser cladding and the microstructure and the microhardness of different areas of the coating were studied. The results showed that an in-situ synthesis between graphene and Ti occurred during the laser cladding process and TiC was formed. At the top of the coating, the amount of TiC formed was less and it was not homogeneously distributed. In the middle of the coating, TiC was homogeneously distributed and the number of TiC particles was significantly higher. Because of the rapid cooling rate at the top, many of the nucleated TiC particles did not grow significantly. The TiC was fully grown in the middle because of lower heat dissipation and a relatively slow cooling rate; furthermore, convection of the molten pool promoted the homogeneous distribution of TiC in the middle of the cladded coating. Compared with the middle part of the coating, the coating bonded well with the Ti6Al4V matrix at the bottom of the coating. Moreover, α' acicular martensite was formed during the rapid solidification process in the heat-affected zone (HAZ). The TiC and the α-Ti phase displayed an orientation relationship extremely close to [−2 −2 0] TiC // [2 −4 0 2] α-Ti. The hardness of the TiC/Ti6Al4V composite coating was 57% higher than that of the Ti6Al4V matrix, with the hard TiC particles played a strengthening role. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
