MICROSTRUCTURE ALONG THICKNESS DIRECTION OF FRICTION STIR WELDED TC4 TITANIUM ALLOY JOINT

CORC > 金属研究所 > 中国科学院金属研究所

	MICROSTRUCTURE ALONG THICKNESS DIRECTION OF FRICTION STIR WELDED TC4 TITANIUM ALLOY JOINT
	Ji Shude 2; Wen Quan 2; Ma Lin 2; Li Jizhong 1; Zhang Li 2
刊名	ACTA METALLURGICA SINICA
	2015
卷号	51 期号:11 页码:1391-1399
关键词	MECHANICAL-PROPERTIES ALUMINUM-ALLOY OXIDATION PHASE friction stir welding TC4 titanium alloy peak temperature microstructure tensile strength
ISSN号	0412-1961
其他题名	MICROSTRUCTURE ALONG THICKNESS DIRECTION OF FRICTION STIR WELDED TC4 TITANIUM ALLOY JOINT
英文摘要	As 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.
资助项目	[National Natural Science Foundation of China] ; [Natural Science Foundation of Liaoning Province]
语种	英语
CSCD记录号	CSCD:5562031
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/154513]
专题	金属研究所_中国科学院金属研究所
作者单位	1.Beijing Aeronaut Mfg Technol Res Institute, Beijing 100024, Peoples R China 2.中国科学院金属研究所
推荐引用方式 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.