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作 者:王飞[1,2,3] 陈福龙[1,2,3] 韩秀全[1,2,3] 盖鹏涛[1,2,3]
机构地区:[1]北京航空制造工程研究所,北京100024 [2]塑性成形技术航空科技重点实验室,北京100024 [3]数字化塑性成形技术与装备北京市重点实验室,北京100024
出 处:《塑性工程学报》2017年第3期96-101,共6页Journal of Plasticity Engineering
摘 要:对超塑变形前后TC4钛合金激光叠焊接头的微观组织进行观察与分析。结果表明:在超塑变形过程中,焊缝的马氏体针状组织转变为层片状,变形过程中层片状组织被打断,超塑变形温度越高,层片状组织越碎化;超塑性变形应变速率对钛合金显微组织有重要影响,随着应变速率减小,母材α相的数量减小,而晶间β相数量逐渐增加,且两相都有等轴化趋势,但由于应变速率的减小,使得晶粒有一定程度长大;TC4钛合金激光焊焊缝组织由原始针状组织逐渐发展为层片状组织是超塑变形过程中激光焊焊缝剪切应力、相转变以及变形过程中动态再结晶等因素共同作用的结果。Microstructures of TC4 titanium alloy welded joints before and after superplastic deformation were observed. Results indicate that needle-like martensite phase of weld bead translates to lamellar structure which is interrupted during deformation and becomes shorter and wider with increasing temperature. The strain rate of superplastic deformation has important impact on microstructure of titanium alloy. The quantity of α phase of parent metal decreases and intergranular β phase increases and both of them become equiaxed with the decrea- sing strain rate, but the grains grow coarser under lower strain rate. During superplastic deformation, the change from needle-like mar- tensite phase of weld bead to lamellar structure is conducted under the actions of phase transition, shearing stress and dynamic recrystallization.
分 类 号:V261.75[航空宇航科学与技术—航空宇航制造工程]
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