NiAl合金锥筒内压胀形–原位反应一体化成形工艺研究  

Study on Integrated Forming Process of Internal Pressure Bulging and In-Situ Reaction for NiAl Alloy Conical Cylinder

作　　者：黄钟森 秦锦涛 薛帅兵 林鹏[1] HUANG Zhongsen;QIN Jintao;XUE Shuaibing;LIN Peng(Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学,太原030024

出　　处：《航空制造技术》2023年第9期63-67,74,共6页Aeronautical Manufacturing Technology

基　　金：国家自然科学基金(51505323)。

摘　　要：针对NiAl合金板坯制备及复杂薄壁构件二次成形困难的技术难题,提出一种成形与原位反应一体化成形新工艺制造NiAl合金薄壳件,即先将Ni箔与Al箔交替堆叠置于模具中,再在固体颗粒介质作用下塑性成形,然后使成形后的Ni/Al叠层薄壳件继续停留在模具中,在固体颗粒介质压力作用下加热使Ni/Al叠层发生原位反应合成NiAl合金,从而制得NiAl合金薄壳件。采用扫描电子显微镜(SEM)与能谱仪(EDS)对构件微观组织进行表征,并对其高温力学性能进行测试。结果表明,采用该方法制得的NiAl合金锥筒由单一NiAl相构成,厚度方向上粗晶层与细晶层交替排布,为典型的双峰组织,无孔洞等缺陷。构件硬度为317HV且分布均匀,1000℃抗拉强度为71MPa,延伸率可达74%。In view of the technical difficulties in the preparation of NiAl alloy sheets and the secondary forming of the complex thin-walled components,a new integrated process of forming and in-situ reaction is proposed to manufacture NiAl alloy thin shell parts.First,the Ni foils and Al foils are alternately stacked in the mold and plastic forming is performed under the action of solid granules medium,then the formed Ni/Al laminated thin shell parts continue to stay in the mold and are heated under the pressure of the solid granules medium,leading to the in-situ reaction of Ni/Al layers into the NiAl alloy.Finally,the NiAl thin shells are manufactured.The microstructure of the component was characterized by scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS),and the high temperature mechanical properties were tested.The results show that the NiAl alloy conical shell is composed of single NiAl phase,and the coarse crystal layer and fine crystal layer are alternately distributed in the thickness direction,which is a typical bimodal structure without holes and other defects.The component hardness is 317HV and the distrbution is uniform,the tensile strength is 71 MPa at 1000℃,and the elongation can reach 74%.

关 键 词：NIAL合金 原位反应合成 薄壳件 固体颗粒介质成形 双峰组织 

分 类 号：V261[航空宇航科学与技术—航空宇航制造工程]