大长径比深盲孔钛合金壳体双态组织挤压技术研究  

Research on Duplex Microstructure Extrusion Technology for Large Length-Diameter Ratio and Deep Blind Hole Titanium Alloy Shell

作　　者：康凤[1] 陈文 胡传凯[1] 林军[1] 夏祥生[1] 吴洋[1] KANG Feng;CHEN Wen;HU Chuankai;LIN Jun;XIA Xiangsheng;WU Yang(Southwest Technology and Engineering Research Institute, Chongqing 400039, China)

机构地区：[1]西南技术工程研究所,重庆400039

出　　处：《兵器装备工程学报》2019年第S02期204-207,共4页Journal of Ordnance Equipment Engineering

基　　金：总装预研基金项目(41422010502)。

摘　　要：分析了一种大长径比深盲孔钛合金壳体,在不同温度下的成形组织及其对性能的影响,结果表明,当挤压发生在相变点以下时,动态再结晶引起α相球化,但含量变化不大,力学性能也差别不大;但在相变点以上时,α相含量随着温度的升高明显减少,在920℃时,初生α相含量只有8%左右,组织中几乎完全为β转,粗大的β晶界内布满片条状α集束,抗拉强度上升,而延伸率则明显下降。最后结合工艺试验,采用优化出的钛合金壳体挤压参数,制备出尺寸及性能均符合要求的锻件。Aiming at a kind of large aspect ratio and deep blind hole Titanium alloy shell,this paper analyzed the forming structure of the alloy at different temperatures and its influence on its properties.The results show that when the extrusion occurs below the phase transition point,dynamic recrystallization causesαphase spheroidization,but the content changes little,and the properties shows little difference.But above the phase transition point,the content ofαphase decreases obviously with the increase of temperature.At 920℃,the content of primaryαphase is only about 8%,and the structure is almost completely transformed toβ.The thickβgrain boundaries are covered with rod-shapedαclusters.Tensile strength increases while elongation decreases significantly.Finally,combined with the process test,the forgings with the required size and properties were prepared by using the optimized parameters of the titanium alloy shell.

关 键 词：钛合金 深盲孔 双态组织 挤压 

分 类 号：TG146.23[一般工业技术—材料科学与工程]