薄壁ZTC4钛合金铸件表层与心部组织性能分析  

Analysis of Surface and Central Microstructure and Properties of a Thin-walled ZTC4 Titanium Alloy Casting

作　　者：孙智 吴国清[4] 纪志军 南海 SUN Zhi;WU Guoqing;JI Zhijun;NAN Hai(AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Baimtec Material Co.,Ltd.,Beijing 100094,China;Beijing Engineering Research Center of Advanced Titanium Alloy Precision Forming Technology,Beijing 100095,China;Beihang University,Beijing 100191,China)

机构地区：[1]中国航发北京航空材料研究院,北京100095 [2]北京航空材料研究院股份有限公司,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]北京航空航天大学,北京100191

出　　处：《铸造工程》2022年第4期1-6,共6页Foundry Engineering

基　　金：国家重点研发计划(2020YFB2008300)。

摘　　要：选取某薄壁ZTC4钛合金精密铸件为研究对象,对铸件典型位置的表层和心部显微组织进行了分析与统计,并对铸件各部位在室温下的强度、塑性、冲击韧性、显微硬度等性能进行了测试,分析了其组织和性能分布特征,建立了铸件组织与性能的相应关系。结果表明:薄壁铸件和厚大铸件的表层组织与心部组织分布趋势基本一致,随着铸件壁厚的增加,其表层和心部组织β晶粒平均尺寸均呈近似线性增大的趋势,铸件组织的粗化会导致其综合力学性能下降。A thin-walled ZTC4 titanium alloy precision casting was selected as the research object.The microstructure of the surface and inner layers at typical positions of the casting were analyzed and counted.The tensile and impact properties of each part of the casting at room temperature were tested,and the distribution characteristics of microstructure and properties were analyzed.By analyzing the distribution characteristics of microstructure and properties of the surface and central layers of the titanium alloy casting,the corresponding relationship between the microstructure and properties of the casting was established.The results showed that the distribution trend of surface layer structure and central layer structure of thin-wall castings and thick and large castings was basically consistent.With the increase of casting wall thickness,the surface layer and central layer structure β average grain size increased nearly linearly.The coarsening of the casting structure led to the deterioration of its comprehensive mechanical properties,and its microhardness decreased linearly.

关 键 词：钛合金 薄壁铸件 显微组织 晶粒 

分 类 号：TG146.23[一般工业技术—材料科学与工程]