反重力铸造对ZL205A合金充型性能及凝固组织的影响  

Effect of Counter Gravity Casting on Filling Behavior and Solidification Microstructure of ZL205A Alloy

作　　者：林琳 薛祥义 黄旗 吴天栋 Lin Lin;Xue Xiangyi;Huang Qi;Wu Tiandong(Shaanxi Key Laboratory of Advanced Metal Structural Materials Precision Thermoforming,Xi'an Chaojing Technology Co.,Ltd.,Xi'an 710200)

机构地区：[1]西安超晶科技股份有限公司陕西省先进金属结构材料精确热成形重点实验室,西安710200

出　　处：《特种铸造及有色合金》2024年第1期88-94,共7页Special Casting & Nonferrous Alloys

摘　　要：以“⊥”型和棒状试样为例,研究了反重力条件下,铸造工艺参数对ZL205A合金铸件充型性能和凝固组织的影响。结果表明,对于平均壁厚小于3 mm的薄壁铸件,由于差压铸造充型过程比低压铸造平稳,所以铸件成形更好,但无法成形尖角结构;提高浇注温度或铸型预热温度,均能使差压铸造薄壁ZL205A合金铸件的充型性能得到改善,且提高浇注温度效果更明显。与低压铸造相比,差压铸造可显著细化ZL205A合金晶粒度,适当提高浇注温度与铸型温度,均能进一步细化晶粒,且提高浇注温度使晶粒细化效果更显著。对于有一定截面厚度的ZL205A合金铸件,差压铸造时,当截面厚度超过一定量时,充型性能受铸型温度及浇注系统设计的影响较小,提高铸型温度,铸件产生孔洞类缺陷的几率显著增加。Taking “⊥” shaped and rod-shaped specimens as examples, the effect of casting process parameters on the filling behovior and solidification structure of ZL205A alloy castings under counter gravity conditions were investigated. The results indicate that thin-walled castings with an average wall thickness less than 3 mm exhibit desirable formability due to the smoother filling process of counter gravity differential pressure casting, while sharp corner structures cannot be achieved. Increasing the pouring temperature or mold temperature can improve the filling performance of differential pressure casting thin-walled ZL205A alloy castings, and the former one has a more significant effect than the latter. Compared with low-pressure casting, differential pressure casting can significantly refine the grain size of ZL205A alloy, and increasing the pouring temperature or mold temperature can appropriately further refine the grain size, and the former one has a more significant effect than the latter. For ZL205A alloy castings with a certain crosssectional thickness, when the cross-sectional thickness exceeds a certain amount, the filling performance is less affected by the mold temperature and gating system design during differential pressure casting, and increasing the mold temperature leads to more porosity defects in castings.

关 键 词：差压铸造 充型性能 凝固组织 ZL205A合金 

分 类 号：TG249.2[金属学及工艺—铸造] TG146.21[一般工业技术—材料科学与工程]