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作 者:付明杰[1,2,3] 陈俐 曾元松[1,2,3] Fu Mingjie;Chen Li;Zeng Yuansong(Beijing Aeronautical Manufacturing Technology Research Institute,Beijing 100024,China;Aeronautical Key Laboratory for Plastic Forming Technology,Beijing 100024,China;B eijing Key Laboratory of Digital Plasticity Forming Technology and Equipment,Beijing 100024,China;Key Laboratory for High Energy Density Beam Processing Technology,Beijing 100024,China)
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 [4]高能束流加工技术重点实验室,北京100024
出 处:《稀有金属材料与工程》2018年第8期2555-2560,共6页Rare Metal Materials and Engineering
基 金:航空基金项目(2015ZE25017)
摘 要:对光纤激光焊接的SP700钛合金的超塑变形性能、组织演化及变形后的力学性能进行研究。结果发现,800℃锥形件变形时,焊接方向平行轧制方向具有更优的超塑变形性能,最大成形压力为0.8 MPa,最大成形高度为75 mm,较母材高20 mm。随着变形量的增加,焊缝区粗大的柱状晶和焊接接头咬边逐渐消失,晶粒得到细化。经过33%的超塑变形量后,焊接方向平行和垂直轧制方向的抗拉强度均有所下降,但平行轧制方向、775℃成形的抗拉强度下降最小,仅为2.2%。锥形件和盒形件拉伸试样的断裂失效位置均在母材上。The superplastic forming ability, microstructure evolution and tensile property of fiber laser welding SP700 titanium alloy after superplastic forming (SPF) were investigated. Results indicate that when deformed at 800 ℃, the cone part has better superplasticity with the welding direction parallel to the rolling direction of base material. Its max. pressure is 0.8 MPa and the cone height is 75 mm, which is 20 mm higher than that of base material. With the increase of deformation, the coarse columnar grains and weld undercut are eliminated gradually and the grains are comparably fine. With about 33% deformation reduction, the tensile strength of materials with two welding directions all decreases, and tensile strength of the specimen formed at 775℃ with welding direction parallel to the rolling direction only decreases by 2.2%. The fracture positions are all on the base material for the cone part and tensile specimen.
关 键 词:SP700钛合金 激光焊接 超塑性 显微组织 抗拉强度
分 类 号:TG146.23[一般工业技术—材料科学与工程]
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