Abstract: In this paper, linear friction welded (LFW) joints of hyperoxic TC4/TC17 dissimilar titanium alloys were subjected to post weld heat treatment (PWHT). The effect of PWHT processing parameters on the microstructure,micro-hardness and fracture toughness of the linear friction welded joints for dissimilar titanium was investigated. The results showed that the metastable β phase was formed on the side of TC17 weld zone of the linear friction welded joints of dissimilar titanium alloys, and the acicular martensite phase was found on the side of hyperoxic TC4 as weld condition. After PWHT, the lath α phase was precipitated at β grain boundary, while the acicular α phase within the β grain, and the residual α phase in the joint region was decomposed during the heat treatment. With the increase of temperature of heat treatment, the size of the precipitation of lath and acicular α phase significantly enlarged, simultaneously, the micro-hardness of the joint enhanced. The results of crack tip opening displacement (CTOD) showed that the weak zone of the joint fracture toughness is in the weld zone and the thermo-mechanically affected zone of TC17 side. The increase of the post-weld heat treatment temperature can effectively improve the fracture toughness of the weak zones.
1 Gao J, Luo J, Li M Q. Journal of Aeronautical Materials, 2012, 32(6),37(in Chinese). 高峻, 罗皎, 李淼泉.航空材料学报, 2012, 32(6),37. 2 Yao Z K, Guo H Z, Liu J C, et al. The Chinese Journal of Nonferrous Metals, 2000, 10(3),378 (in Chinese). 姚泽坤, 郭鸿镇, 刘建超, 等.中国有色金属学报, 2000, 10(3),378. 3 Liu Y Y, Yao Z K, Guo H Z.Materials Reports, 2007, 21(12),95 (in Chinese). 刘莹莹, 姚泽坤, 郭鸿镇. 材料导报, 2007, 21(12),95. 4 Vairis A, Frost M.Wear, 1998, 217(1),117. 5 Zhang T C, Li J, Ji Y J, et al. Transactions of the China Welding Institution, 2010, 31(2),53 (in Chinese). 张田仓, 李晶, 季亚娟,等.焊接学报, 2010, 31(2),53. 6 Dalgaard E, Wanjara P, Gholipour J, et al.Acta Materialia, 2012, 60(2),770. 7 Wanjara P, Jahazi M.Metallurgical & Materials Transactions A, 2005, 36(8),2149. 8 Anthony R McAndrew,Paul A Colegrve. Progress in Materials Science, 2018,92, 225. 9 Ji Y J, Zhang T C, Li X H. Aeronautical Manufacturing Technology, 2011(8),66(in Chinese). 季亚娟, 张田仓, 李晓红. 航空制造技术, 2011(8),66. 10 Ji Y J, Liu Y B, Zhang T C, et al. Transactions of the China Welding Institution, 2012, 33(9),101(in Chinese). 季亚娟,刘燕冰,张田仓,等.焊接学报,2012,33(9),101. 11 Zhang C C, Huang J H, Zhang T C, et al. Journal of Materials Enginee-ring, 2011(10),38(in Chinese). 张传臣, 黄继华, 张田仓,等. 材料工程, 2011(10),38. 12 Zhang C C, Huang J H, Zhang T C, et al. Transactions of the China Welding Institution, 2012,33(4),97(in Chinese). 张传臣, 黄继华, 张田仓,等.焊接学报, 2012, 33(4),97. 13 Ji Y, Chai Z, Zhao D, et al. Journal of Materials Processing Technology, 2014, 214(4),979. 14 Li J, Zhang T C, Guo D L, et al. Aeronautical Manufacturing Technology, 2015, 472(3),68(in Chinese). 李菊, 张田仓, 郭德伦,等. 航空制造技术, 2015, 472(3),68. 15 Liu Z C, Zhang L J, Zhang C H.World Nonferrous Metals, 2016(16),151(in Chinese). 刘志成, 张利军, 张晨辉. 世界有色金属, 2016(16),151. 16 Wu Q Z, Li Z C, Wang W M. Rare Metal Materials & Engineering, 1995(1),28(in Chinese). 吴清枝, 李佐臣, 王卫民.稀有金属材料与工程, 1995(1),28. 17 Zhao Y Q. Phase Transformation and heat treatment of titanium alloy, Central South University Press, China, 2012 (in Chinese). 赵永庆.钛合金相变及热处理, 中南大学出版社, 2012.
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2021, Vol. 35 
