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工程科学与技术:2012,44(3):185-192
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Inconel718合金多层夹芯筒结构LBW/SPF技术研究
(1.重庆大学 材料科学与工程学院;2.哈尔滨工业大学 材料科学与工程学院)
Study on LBW/SPF Technology of Multi-sheet Cylinder Sandwich Structure for Inconel718 Superalloy
(1.College of Material Sci. and Eng.,Chongqing Univ.;2.School of Materials Sci. and Eng., Harbin Inst. of Technol.)
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投稿时间:2011-08-12    修订日期:2012-02-16
中文摘要: 研究了超细晶Inconel718合金激光对接板高温塑性及多层夹芯筒结构的LBW/SPF成形技术。结果表明:垂直焊缝拉伸时最大延伸率发生在温度为950 ℃、应变速率为3.1×10^-4 s^-1条件下,为400.6%,平行焊缝拉伸时最大延伸率发生在温度为965 ℃,应变速率为6.2×10^-4 s^-1条件下,为164.0%。对接板在950~980 ℃相对胀形高度均高于1.0。通过设计直径可变的卡具以及采取点焊加固等措施,解决了多层夹芯结构的激光焊接难题。激光穿透焊参数:功率1 200 W,焊速1 200 mm/min,离焦量-1 mm,保护气体流量0.6 L/min,超塑成形参数:温度Tf=965 ℃,压力Pf=4.2 MPa,时间tf=130 min。采用LBW/SPF技术制造的多层夹心筒结构具有外观形状好、壁厚分布均匀、内部结构对称度高等优点。
Abstract:The high temperature plasticity of the laser butt welding plate and LBW/SPF technology for Inconel718 superalloy with ultra-fine grain were investigated. The results showed that when the tensile direction is vertical to laser welding seam, the maximum elongation is 400.6% at temperature of 950 ℃ with initial strain rate of 3.1×10^-4 s^-1. When the tensile direction is parallel to laser welding seam, the maximum elongation is 164.0% at temperature of 965 ℃ with initial strain rate of 6.2×10^-4 s^-1.At the temperature of 950~980 ℃,the laser butt welding plate has good plasticity in free bulging state. The relative bulging height is higher than 1.0. The laser welding problem of multi-sheet cylinder sandwich structure is settled through clamp apparatus which has internal stay of diametral variation. The laser penetration welding parameters are the power of 1 200 W, welding speed of 1 200 mm/min, defocusing amount of -1 mm, shield gas flow rate of 0.6 L/min. The parameters for superplastic forming are the temperature of 965 ℃, pressure of 4.2 MPa, time of 130 min. The multi-sheet cylinder sandwich structure by LBW/SPF composite technology has good shape, uniform wall thickness distribution, the high symmetry of internal structure.
文章编号:201100724     中图分类号:    文献标志码:
基金项目:重庆大学2010博士点基金资助项目(RFDP20102302120002)
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曲凤盛,卢振,刑飞,张凯锋.Inconel718合金多层夹芯筒结构LBW/SPF技术研究[J].工程科学与技术,2012,44(3):185-192.
Qu Fengsheng,Lu Zhen,Xing Fei,Zhang Kaifeng.Study on LBW/SPF Technology of Multi-sheet Cylinder Sandwich Structure for Inconel718 Superalloy[J].Advanced Engineering Sciences,2012,44(3):185-192.