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TC4钛合金搅拌摩擦焊厚度方向的显微组织
MICROSTRUCTURE ALONG THICKNESS DIRECTION OF FRICTION STIR WELDED TC4 TITANIUM ALLOY JOINT

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姬书得 1 *   温泉 1   马琳 1   李继忠 2   张利 1  
文摘 采用搅拌摩擦焊(friction stir welding, FSW)实现了2 mm厚TC4钛合金连接,结合数值模拟结果研究了温度分布对焊缝沿厚度方向显微组织特征和接头力学性能的影响规律.结果表明,当焊接速率为50 mm/min且转速为300 r/min时,靠近焊缝表面的材料温度峰值超过β相变温度.随着到焊缝表面距离的增加温度峰值逐渐变小,靠近焊缝底部的材料未超过β相变温度.在温度峰值超过β相变的焊缝区域,显微组织是由初生α相、板条状α相和剩余转变β相组成,且焊缝内部的板条状α相尺寸大于近表面区域.焊缝底部受到动态再结晶作用,呈现尺寸较小的α和β双相组织,且β相在α相基体上分布更均匀.当转速提高到350 r/min时,沿焊缝厚度方向上的超过β相变温度的区域变宽,板条状α相所占面积和尺寸增大,组织中出现板条状α相丛.取向不同的板条状α相散乱分布于组织中,阻碍裂纹扩展,利于接头的抗拉强度.
其他语种文摘 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 β 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 β phase transus temperature owing to quick heat radiation. The region, where the peak temperature is higher than β phase transus temperature, consists of primary α, lath-shape α and residual β phases. The size of lath-shape α inside the weld is larger than that near the weld surface. Primary α and β phases with smaller size are attained in the weld bottom owing to the dynamic recrystallization, and the distribution of β phase on primary a matrix is more homogeneous. When the rotational speed reaches 350 r/min, the area where the peak temperature is higher than β phase transus temperature becomes wider along the thickness direction, which makes the size and quantity of lath-shape a phase increase and then the lath-shape a clump appears. Lathshape a phase with different orientations hinder the propagation of crack and be beneficial for the tensile strength of FSW joint.
来源 金属学报 ,2015,51(11):1391-1399 【核心库】
DOI 10.11900/0412.1961.2015.00099
关键词 搅拌摩擦焊 ; TC4钛合金 ; 温度峰值 ; 显微组织 ; 抗拉强度
地址

1. 沈阳航空航天大学航空航天工程学部, 沈阳, 110136  

2. 北京航空制造工程研究所, 北京, 100024

语种 中文
文献类型 研究性论文
ISSN 0412-1961
学科 金属学与金属工艺
基金 国家自然科学基金项目 ;  辽宁省自然科学基金
文献收藏号 CSCD:5562031

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引证文献 7

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