大型复杂钛合金铸件组织分布规律研究  

Microstructure Distribution of Large-scale Complex Titanium Alloy Castings

作　　者：郄喜望 南海[1,2] 赵文正 吴国清 张美娟[1,2,3] Qie Xiwang;Nan Hai;Zhao Wenzheng;Wu Guoqing;Zhang Meijuan(Beijing Institute of Aeronautical Materials;Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology;Baimtec Material Co.,Ltd.;Beihang University)

机构地区：[1]中国航发北京航空材料研究院,北京100095 [2]北京市先进钛合金精密成型工程技术研究中心 [3]北京百慕航材高科技股份有限公司 [4]北京航空航天大学

出　　处：《特种铸造及有色合金》2020年第8期828-831,共4页Special Casting & Nonferrous Alloys

摘　　要：针对航空发动机用大型复杂钛合金铸件的组织和性能评估问题,通过分析铸件各区组织分布及异常晶粒存在情况,研究了影响铸件组织的关键因素,完成了对某航空发动机用钛合金大型机匣铸件的组织分布规律分析。结果表明,铸件晶粒尺寸的分布范围为44~7660μm,约82%的晶粒尺寸处于1650μm以内。随着铸件壁厚增加,各区的晶粒尺寸均值、晶粒尺寸分布半高宽均呈近对数增加趋势。铸件的壁厚、结构特征、靠近浇道位置、凝固顺序都会影响铸件的凝固,其中壁厚的影响最为显著。In order to evaluate the microstructure and performance of large-scale complex titanium alloy castings and other aircraft critical structural components,the structural uniformity of a titanium alloy mainframe casting was analyzed.By analyzing the distribution of the various regions of the casting and the presence of anomalous grains,the key factors affecting the casting microstructure were described,and the microstructure homogeneity of a titanium alloy mainframe casting was evaluated.The results show that the grain size in the castings is in range of 44μm to 7660μm,and the sizes of 82%of the grains are within 1650μm.As the thickness of the casting increases,the average grain size and the FWHM of the surface layer and the center layer of the casting show a nearly logarithmic increased trend.The factors such as wall thickness,structural characteristics and pouring sequence of the castings all have an important influence on solidification,of which the wall thickness has the most significant effect.

关 键 词：钛合金铸件 组织 分布规律 航空发动机 

分 类 号：TG146.23[一般工业技术—材料科学与工程] V263[金属学及工艺—金属材料]