强制冷却对TC4钛合金搅拌摩擦焊接接头组织性能影响

发布时间：2018-05-17 13:52

本文选题：搅拌摩擦焊接 + TC钛合金　；参考：《稀有金属材料与工程》2015年11期

【摘要】：分别在空气和强制冷却条件下对TC4钛合金板进行了搅拌摩擦焊接(Friction stir welding,FSW),对比研究了焊接接头的微观组织和力学性能。结果表明,FSW接头分为搅拌区、热机械影响区和母材区。母材区为热轧退火后的初生α和β双相组织。空气条件下焊接,搅拌区为α+β片层结构,组织转变主要为β相转变为片层α+β两相,热机械影响区为等轴晶α和α+β片层的双态组织,组织转变受动态再结晶和相变共同作用。强制冷却条件下焊接,搅拌区为针状马氏体,组织转变主要为马氏体相变。与空气条件下接头相比,强制冷却条件下的FSW接头显微硬度明显提高,但抗拉强度略微降低。
[Abstract]:Friction stir welding (Friction stir welding) of TC4 titanium alloy plates was carried out under air and forced cooling conditions. The microstructure and mechanical properties of the welded joints were compared. The results show that the FSW joint can be divided into stirring zone, thermo-mechanical zone and base metal zone. The base metal region is the primary 伪 and 尾 phase structure after hot rolling annealing. In air welding, the agitated zone is 伪尾 lamellar structure, the microstructure transition is mainly 尾 phase to lamellar 伪尾 two-phase, and the thermomechanical influence zone is the double structure of equiaxed 伪 and 伪尾 lamellae. The microstructure transition is affected by dynamic recrystallization and phase transformation. In forced cooling welding, the stirring zone is acicular martensite, and the microstructure transformation is mainly martensite transformation. Compared with the joints under air conditions, the microhardness of the FSW joints under forced cooling conditions is obviously increased, but the tensile strength is slightly decreased.
【作者单位】：西安建筑科技大学;西安飞机国际航空制造股份有限公司;
【基金】：国家自然科学基金(U1360105) 陕西省教育厅产业化项目(2012JC14) 陕西省工业攻关项目(2013K09-11) 西安市科技计划项目(CXY1124(4))
【分类号】：TG453.9

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