摘要
利用选区激光熔化(Selective laser melting,SLM)技术打印TC4合金成形义齿支架,研究在人工唾液(模拟口腔环境)中不同腐蚀时间下其耐腐蚀性能的变化规律,对其显微组织进行分析,结合电化学测试和腐蚀后形貌对耐腐蚀性能的趋势进行探究,并与铸造TC4合金进行对比。结果表明:随着腐蚀时间的延长,SLM样件的耐腐蚀性呈现逐渐增强的趋势,而铸造样件的耐腐蚀性先增强后降低。腐蚀后的SLM合金表面形成钝化膜,其成分以TiO_(2)、Al_(2)O_(3)为主,样件表面腐蚀形态以蚀坑为主,而铸造样件表面缺陷多于SLM样件。SLM打印TC4的物相主要为密排六方结构的α相与生长方向呈±45°的α′马氏体相,其针状α′马氏体晶粒尺寸为(2±0.5)μm,并没有明显β相出现;铸造样件的物相为α+β相。SLM成形TC4的耐腐蚀性能与显微组织中复杂的α′马氏体相转变有关。
Selective laser melting(SLM)technology was applied to print TC4 alloy denture scaffold.The corrosion resistance of TC4 alloy was studied in artificial saliva(simulated oral environment)under different corrosion times.The electrochemical test curves and microstructure were analyzed and compared to the cast TC4 alloy.The results show that the corrosion resistance of SLM samples gradually increases with the increase of corrosion time,while that of cast samples gradually decreases,but the corrosion resistance of SLM samples is slightly worse than that of cast samples at the same corrosion time.After corrosion,the surface of SLM alloy forms passivated film,which is mainly composed of TiO_(2)and Al_(2)O_(3).The phase of TC4 printed by SLM is mainlyαandα′martensite phase with closely arranged hexagonal structure,but no obviousβphase.The casting samples is composed ofαandβphase.The corrosion resistance of TC4 manufactured by SLM is related to the complexα′martensite phase transformation in the microstructrue.
作者
冯庆晓
李多生
宋胜利
叶寅
王国波
王明娣
FENG Qingxiao;LI Duosheng;SONG Shengli;YE Yin;WANG Guobo;WANG Mingdi(School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China;College of Mechanical and Electrical Engineering,Army Engineering University of PLA,Nanjing 210016,China;School of Mechanical and Electrical Engineering,Soochow University,Suzhou 215137,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2021年第6期6107-6113,共7页
Materials Reports
基金
国家自然科学基金项目(51562027)
江西省重点研发计划重点项目(20201BBE51001)
江西省省级优势科技创新团队项目(20181BCB24007)
江西省自然科学基金项目(20171BAB216003)。
