Neutral Molten Salt-Bath Carburizing of Ti6Al4V Alloy with Nanocrystalline Surface Layer at Low Temperature Assisted by Surface Mechanical Attrition Treatment
Nanocrystalline surface layer about 10~15μm thick was fabricated on the surface of Ti6Al4V sheet by means of the surface mechanical attrition treatment (SMAT).The average grain size was about 10nm and the grain characteristic presented equiaxed morphology.The nanocrystalline surface layer could be perfectly maintained below 550℃ in the following thermal stability analysis.Neutral salt mixture was about 21% NaCl, 31% BaCl2 and 48% CaCl2 and additionally 5% Na2CO3 of total was utilized.After carburizing process, a continuous charcoal grey carburized layer was composed of TiC and carbon supersaturated solid solution, the hardening layer was about 10~15μrn thick.The hardness of the outermost surface reached 1000HV, which was much higher than its coarse-grained counterpart in the same carburizing condition.The experimental result indicated that the carburizing kinetics was obviously enhanced by nanocrystalline surface layer assistance.Furthermore, the neutral molten salt-bath carburizing was verified that it could be performed in a relatively low temperature of 650℃.
Neutral molten salt-bath Carburizing Ti6Al4V alloy Nanocrystalline
Quan-tong Yao Nei-ping Tong Meng-yao Li Guang-lan Zhang
Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110004, PR China
国际会议
The 2016 China Functional Materials Technology and Industry Forum (2016中国国际功能材料大会暨第九届中国功能材料及其应用学术会议)
重庆
英文
1001-1008
2016-07-25（万方平台首次上网日期，不代表论文的发表时间）