摘要
针对ZL101A铝合金传动箱体铸件因微观孔洞缺陷造成油道漏油问题,借助X射线探伤和SEM缺陷形貌观察,发现微观孔洞类缺陷为微观缩松和气孔缺陷两类,且以微观缩松缺陷为主。运用XRF光谱、MAGMA工艺仿真等手段分析发现,缩松形成的主要原因是凝固补缩不足,而气孔主要是合金液中的气体与氧化铝夹杂物相互作用引起的。根据缺陷分析结果,将重力铸造改为差压铸造,并在铸件发生缺陷的油道部位增设一处内浇道,同时降低浇注温度。另外,熔炼ZL101A合金液时,添加Al-5Ti-1B中间合金进行细化处理。结果表明,铸件组织致密,微观孔洞基本消除,满足ASTM E155Ⅱ级要求。
Aiming at the quality problems of oil leakage caused by microporosity defect in ZL101 A aluminum alloy transmission box casting,the micro shrinkage porosity and pore defects were identified in virtue of X-ray flaw detection and SEM defect morphology observation,and the main micro shrinkage porosity defects were dominated.By means of XRF spectrum analysis and magma process simulation analysis,the results indicate that insufficient solidification feeding leads to the micro shrinkage defect,and the pore defect is mainly induced by the interaction between gas in alloy liquid and alumina inclusions.According to the defect analysis results,the casting process was optimized.The gravity casting process was adjusted to the differential pressure casting process,and an inner gate was added to the oil passage where the casting defect occurs,meanwhile the pouring temperature was reduced.With melting ZL101 A alloy,Al-5 Ti-1 B intermediate alloy was added for refining treatment.The structure of specimens manufactured by the optimized process is compact with few micro hole defects,meeting ASTM E155 gradeⅡand the product design requirements.
作者
杨小冬
周文龙
马文龙
Yang Xiaodong;Zhou Wenlong;Ma Wenlong(Jianglu Machinery Electronics Group Co.,Ltd.;Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province),Dalian University of Technology;Dalian Technology(Yingkou)Advanced Material Engineering Center Co.,Ltd.)
出处
《特种铸造及有色合金》
CAS
北大核心
2022年第12期1566-1569,共4页
Special Casting & Nonferrous Alloys
基金
辽宁省“兴辽英才计划”资助项目(XLYC1902084)
关键词
ZL101A合金
差压铸造
微观孔洞
工艺优化
ZL101A Alloy
Differential Pressure Casting
Micro Porosities
Casting Process Optimization
