TC4线性摩擦焊接头的力学性能及组织变化特点  

Mechanical properties and microstructure features of linear friction welded TC4 titanium alloy joint

作　　者：马铁军[1] 杨思乾[1] 张勇[1] 李文亚[1] 

机构地区：[1]西北工业大学材料学院,西安710072

出　　处：《焊接学报》2007年第10期17-20,共4页Transactions of The China Welding Institution

基　　金：航空科学基金资助项目(20061153015)

摘　　要：用自制的XMH—160型线性摩擦焊机进行了TC4线性摩擦焊试验研究。利用前期试验优化的工艺参数进行焊接,获得了100%焊合率的焊接接头。对焊后试件进行了拉伸性能试验,拉伸试件均断在远离焊缝的母材区,表明接头的力学性能指标超过了母材。对接头解剖后进行了组织分析和显微硬度测试,发现焊缝中部宽约60μm,边缘宽约110μm,焊缝两边的金属流线组织呈对称分布;焊缝中心区为α+β超细晶组织,近缝区为不同程度的α+β变形组织,但晶粒未明显长大;焊缝的显微硬度明显高于母材。接头组织的上述变化特点是拉伸力学性能和显微硬度均高于母材的主要原因。The linear friction welding (LFW) experiment of TC4 titanium alloy was carried out with homemade LFW machine (XMH-160). Joints with 100% joining rate were obtained under the optimum parameters based on the experiments. All the tensile test specimens fractured in the base metal of TC4 at a place far form the weld, which indicated that the mechanical properties of the weld are higher than those of the base metal. The microstructure of the joint was observed, and it showed that the thickness of the weld is about 60 μm at the central zone and around 110 μm at the marginal zone, and the metal streamline are distributed symmetrically on both sides of weld. The weld consists of the superfine α+β strucure, and the zone close to the weld consists of α and β phases deformed in different degree, but they did not grow up obviously. The microhardness of the weld is higher than that of the base metal markedly. It is the microstructure features of the weld that contribute to the higher tensile properties and microhardness than those of the base metal.

关 键 词：TC4钛合金 线性摩擦焊 力学性能 组织 显微硬度 

分 类 号：TG453.9[金属学及工艺—焊接]