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阎相忠,但磊,杨屹,田彦康,黄坤兰.电场升温速率对成型Ti6Al4V钛合金微齿轮的影响[J].稀有金属材料与工程(英文),2020,49(10):3294~3300.[yanxiangzhong,danlei,yangyi,tianyankang and huangkunlan.Effect of Heating Rate on Formability of Ti6Al4V Alloy Micro-gear under an Electric Field[J].Rare Metal Materials and Engineering,2020,49(10):3294~3300.]
Effect of Heating Rate on Formability of Ti6Al4V Alloy Micro-gear under an Electric Field
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Received:February 24, 2020  Revised:March 28, 2020
Key words: Ti6Al4V alloy  hard-to-deform  electric field  micro-gear  formability
Foundation item:National Nature Science Foundation of China (no.51705348), Sichuan science and technology program (no.2019YFG0359) and the Research Funds for the Central University (no.2019SCUH0013)
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yanxiangzhong,danlei,yangyi,tianyankang and huangkunlan  
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      In this paper, a novel micro plastic forming technology is introduced for the forming of micro-gear using the high strength, toughness, and hard-to-deform Ti6Al4V alloy material. The experimental results showed that the Ti6Al4V alloy micro-gear can be achieved successfully from a cylindrical Ti6Al4V billet with a set of graphite die under an electric field. The Ti6Al4V material exhibits the best formability when the heating rate is 5 ℃/s, however, higher heating rate 30 ℃/s and 40 ℃/s can effectively shorten the time for pre-heating the material for deformation. The microstructure in all the formed samples have the Widmanst?tten structure. but gear center in contradiction to tooth top which exhibit a finer microstructure, and the β phase content of specimens with the heating rates of 5 ℃/s and 10 ℃/s are slightly higher than the original billet but specimens involving in heating rates 20 ℃/s, 30 ℃/s, and 40 ℃/s show nothing of the β phase from XRD analysis. Moreover, Vickers hardness of all formed samples increase than that of the original billet after an electric field, and which is independent on the heating rates.