ZTC4钛合金大型复杂铸件组织及性能均匀性  

Homogeneities of Microstructure and Mechanical Properties of Large Complex Castings of ZTC4 Titanium Alloy

作　　者：郄喜望[1,2,3] 殷亚军[4] 吴国清[5] 南海[1,3] 

机构地区：[1]中国航发北京航空材料研究院,北京100095 [2]北京百慕航材高科技股份有限公司,北京100094 [3]北京市先进钛合金精密成型工程技术研究中心,北京100095 [4]华中科技大学,武汉430074 [5]北京航空航天大学,北京100191

出　　处：《精密成形工程》2017年第4期85-89,共5页Journal of Netshape Forming Engineering

基　　金：工信部民用飞机专项(MJ-2014-G-25)

摘　　要：目的以工程应用的大型复杂结构ZTC4钛合金铸件为研究对象,研究铸件复杂结构特征对组织、化学成分、力学性能分布均匀性的影响规律。方法用金相显微镜和扫描电镜对组织形貌进行观察。结果 Ti,Al元素在铸件各位置的分布比较均匀,V元素不均匀性较高。随铸件壁厚尺寸的增大,β晶粒尺寸和α片层间距成近线性增加的趋势,且β晶粒尺寸增幅较α片层间距大。结论铸件壁厚尺寸增加,宏观硬度和显微硬度呈近线性下降的趋势。The paper aims to study the influence rules of complex structure characteristics on homogeneities of microstructure, chemical compositions and mechanical properties by taking large complex in ZTC4 titanium casting of large complex structure in engineering applications as a target. Elements Ti and Al were distributed uniformly in each position of the casting. Element V had high inhomogeneity. The ,β grain size and u lamellar spacing increased linearly with the increase of wall thickness of castings. The increase ofβ grain size was larger than that of α lamellar spacing. Macro-hardness and micro-hardness decrease with the increase of wall thickness.

关 键 词：钛合金铸件 大型复杂结构 微观组织 力学性能 均匀性 

分 类 号：TG292[金属学及工艺—铸造]