航空材料学报2009，Vol.29Issue(6)：53-58,6.DOI:10.3969/j.issn.1005-5053.2009.6.011
TC21细晶钛合金TIG焊接接头组织及力学性能研究
Study on Microstructure and Mechanical Properties of Fine Grain TC21 Alloy in TIG
周水亮 1陶军 1郭德伦1
作者信息
- 1. 北京航空制造工程研究所,北京,100024
- 折叠
摘要
Abstract
Fine grain TC21 alloy with various grain sizes were welded by conventional TIG welding. The mechanical properties of welded joint were investigated. The results showed that the tensile strength of welded joint of fine grain TC21 with various grain sizes was about 95% one of the base metal, the weldability of TC21 alloy was good by and large. But welded joint was seriously brittle, the specific elongation and reduction of cross section area of welded joint were more lower than that of the base metal. The microstructure of fusion zone (FZ)and heat-affected zone(HAZ) were similar ,which were called α′ martensites. With the same parameters, the microstructure of FZ and (HAZ) of 2μm TC21 alloy were lamellar or long granular α′ structures, whereas the microstructure of welded joint of 7μm TC21 alloy was needle or small granular α′ structure, which α′ clusters was small and crossed. Hardness measurements showed there was a softened zone in fine grain heat-affected zone(FHAZ) near the base metal, the hardness of softened zone was the lowest. However, the boundaries between FZ and coarse grain heat-affected zone(CHAZ) of welded joint was another softened zone, but hardness decreased slightly in this zone. Tensile fractures of welded joint presented character of quasi-cleavage crack. Cleavage features of fractography of weld joint were more obvious with increasing grain size of the base metal.关键词
细晶粒TC21钛合金/TIG焊接/组织/力学性能Key words
fine grain TC21 alloy /TIG welding / microstructure / mechanical properties分类
矿业与冶金引用本文复制引用
周水亮,陶军,郭德伦..TC21细晶钛合金TIG焊接接头组织及力学性能研究[J].航空材料学报,2009,29(6):53-58,6.
