Effect of solid carburization on surface microstructure and hardness of Ti-6Al-4V alloy and(TiB+La_2O_3)/Ti-6Al-4V composite

作     者：段宏强 韩远飞 吕维洁 毛建伟 王立强 张荻 Hong-qiang DUAN;Yuan-fei HAN;Wei-jie Lü;Jian-wei MAO;Li-qiang WANG;Di ZHANG

作者机构：上海交通大学金属基复合材料国家重点实验室上海200240 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2016年第26卷第7期

页      面：1871-1877页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：Projects(51371114,51501112,51504151)supported by the National Natural Science Foundation of China Project(2012CB619600)supported by the National Basic Research Program of China Project(SAMC14-JS-15-047)supported by the National Engineering and Research Center for Commercial Aircraft Manufacturing,China 

主　　题：titanium alloy titanium matrix composite solid carburization microstructure micro-hardness 

摘      要：Solid carburization was employed to improve the hardness of Ti-6Al-4V alloy and （TiB＋La2O3）/Ti composite. The samples wrapped in graphite powder were placed in sealed quartz tubes, followed by solid carburization at 1227 K for 24 h. Microstructure and phase analysis indicated that TiC reinforcements and Ti-C solid solutions were introduced after solid carburization. Moreover, the volume fraction of equiaxedα-Ti phase in diffusion layer decreased obviously with increasing sample depth. Hardness testing results indicated that both the carburized surfaces performed significant improvement of about 100% in micro-hardness compared with untreated materials. The variation of carbon contents with increasing sample depth resulted in a hardened layer of 300 μm in the carburized samples. Meanwhile, slight influence on the internal microstructure and hardness indicated that solid carburization was an effective method in strengthening the surface of titanium alloy and titanium matrix composite.