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激光焊接Ti-4.5Al-3V-2Fe-2Mo合金的超塑成形組織及性能研究
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北京航空制造工程研究所,北京航空制造工程研究所,北京航空制造工程研究所

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航空資助(項目號：2015ZE25017)


Superplastic deformation microstructure and property of laser welded Ti-4.5Al-3V-2Fe- 2Mo alloy
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Beijing Aeronautical Manufacturing Technology Research Institute,Beijing Aeronautical Manufacturing Technology Research Institute,Beijing Aeronautical Manufacturing Technology Research Institute

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    摘要:

    SP700鈦合金具有優(yōu)異的低溫超塑性,本文對光纖激光焊接的SP700鈦合金的超塑變形性能、組織演化及變形后的力學(xué)性能進(jìn)行研究。結(jié)果發(fā)現(xiàn),800℃錐形件變形時,焊接方向平行軋制方向具有更優(yōu)的超塑變形性能,最大成形壓力為0.8MPa,最大成形高度為75mm,較母材高20mm。隨著變形量的增加,焊縫區(qū)粗大的柱狀晶和焊接接頭咬邊逐漸消失,晶粒得到細(xì)化。經(jīng)過33%的超塑變形量后,焊接方向平行和垂直軋制方向的抗拉強(qiáng)度均有所下降,但平行軋制方向、775℃成形的抗拉強(qiáng)度下降最小,僅為2.2%。錐形件和盒形件拉伸試樣的斷裂失效位置均在母材上。

    Abstract:

    SP700 titanium alloy has excellent superplasticity at low temperature, the paper used fiber laser welding SP700 titanium alloy to study the superplastic forming ability, microstructure evolution and RT tensile property after SPF. Result indicates that the welding direction parallel to the rolling direction of base material could have better superplasticity to form a cone part at 800℃, the max. pressure and cone height is 0.8MPa and 75mm, respectively, which is 20mm higher than base material"s. With the increase of deformation, the coarse columnar grains and weld undercut were eliminated and the grains was comparably fine. With about 33% deformation reduction, the tensile strength of materials with two welding directions were all decreased, and tensile strength of specimen with welding direction parallel to the rolling direction and formed at 775℃ only decreased by 2.2%. The fracture position all were on the base material for the cone part and tensile specimen.

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付明杰,陳俐,曾元松.激光焊接Ti-4.5Al-3V-2Fe-2Mo合金的超塑成形組織及性能研究[J].稀有金屬材料與工程,2018,47(8):2555~2560.[Fu Mingjie, Chen Li, Zeng Yuansong. Superplastic deformation microstructure and property of laser welded Ti-4.5Al-3V-2Fe- 2Mo alloy[J]. Rare Metal Materials and Engineering,2018,47(8):2555~2560.]
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  • 收稿日期:2016-09-20
  • 最后修改日期:2017-03-07
  • 錄用日期:2017-04-13
  • 在線發(fā)布日期: 2018-10-17
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