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MICROSTRUCTURE ALONG THICKNESS DIRECTION OF FRICTION STIR WELDED TC4 TITANIUM ALLOY JOINT
Alternative TitleMICROSTRUCTURE ALONG THICKNESS DIRECTION OF FRICTION STIR WELDED TC4 TITANIUM ALLOY JOINT
Ji Shude1; Wen Quan1; Ma Lin1; Li Jizhong2; Zhang Li1
2015
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume51Issue:11Pages:1391-1399
AbstractAs a solid state technology, friction stir welding (FSW) has been used to join titanium alloys for avoiding the fusion welding defects. So far, many previous studies have attempted to elucidate the microstructure characteristics and evolution during the FSW process of titanium alloy, but few are about the mechanism of microstructure transformation along the thickness direction of joint. For solving this problem, in this work, 2 mm thick TC4 titanium alloy is successfully welded by FSW. On the basis of numerical simulation, the effects of temperature distribution on the microstructure along the weld thickness direction and the tensile strength of welding joint were investigated. The results show that the peak temperatures of material close to weld surface exceed beta phase transus temperature under the rotational speed of 300 r/min and the welding speed of 50 mm/min. With the increase of distance away from the weld surface, the peak temperature decreases. The peak temperature of weld bottom near the backing board is difficult to be higher than beta phase transus temperature owing to quick heat radiation. The region, where the peak temperature is higher than beta phase transus temperature, consists of primary alpha, lath-shape alpha and residual beta phases. The size of lath-shape alpha inside the weld is larger than that near the weld surface. Primary alpha and beta phases with smaller size are attained in the weld bottom owing to the dynamic recrystallization, and the distribution of beta phase on primary alpha matrix is more homogeneous. When the rotational speed reaches 350 r/min, the area where the peak temperature is higher than beta phase transus temperature becomes wider along the thickness direction, which makes the size and quantity of lath-shape alpha phase increase and then the lath-shape alpha clump appears. Lath-shape alpha phase with different orientations hinder the propagation of crack and be beneficial for the tensile strength of FSW joint.
KeywordMECHANICAL-PROPERTIES ALUMINUM-ALLOY OXIDATION PHASE friction stir welding TC4 titanium alloy peak temperature microstructure tensile strength
Indexed ByCSCD
Language英语
Funding Project[National Natural Science Foundation of China] ; [Natural Science Foundation of Liaoning Province]
CSCD IDCSCD:5562031
Citation statistics
Cited Times:5[CSCD]   [CSCD Record]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/154514
Collection中国科学院金属研究所
Affiliation1.中国科学院金属研究所
2.Beijing Aeronaut Mfg Technol Res Institute, Beijing 100024, Peoples R China
Recommended Citation
GB/T 7714
Ji Shude,Wen Quan,Ma Lin,et al. MICROSTRUCTURE ALONG THICKNESS DIRECTION OF FRICTION STIR WELDED TC4 TITANIUM ALLOY JOINT[J]. ACTA METALLURGICA SINICA,2015,51(11):1391-1399.
APA Ji Shude,Wen Quan,Ma Lin,Li Jizhong,&Zhang Li.(2015).MICROSTRUCTURE ALONG THICKNESS DIRECTION OF FRICTION STIR WELDED TC4 TITANIUM ALLOY JOINT.ACTA METALLURGICA SINICA,51(11),1391-1399.
MLA Ji Shude,et al."MICROSTRUCTURE ALONG THICKNESS DIRECTION OF FRICTION STIR WELDED TC4 TITANIUM ALLOY JOINT".ACTA METALLURGICA SINICA 51.11(2015):1391-1399.
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