某型飞机ZL101A机载箱体支架开裂研究  

Study of Cracking of ZL101A Airborne Case Frame of A Certain Type of Aircraft

作　　者：程全士 许永春 刘海涛 张晓玲 徐俭 杨保健 张松松 CHENG Quanshi;XU Yongchun;LIU Haitao;ZHANG Xiaoling;XU Jian;YANG Baojian;ZHANG Songsong(Aerospace Precision Products Inc.,Ltd.,Tianjin 300304,China;School of Materials Science and Engineering,Central South University,Changsha,Hunan 410000,China)

机构地区：[1]航天精工股份有限公司,天津300304 [2]中南大学材料科学与工程学院,湖南长沙410000

出　　处：《云南冶金》2024年第4期121-124,共4页Yunnan Metallurgy

摘　　要：针对某型飞机机载ZL101A铝合金箱体支架开裂,进行了宏、微观断口,化学成分,显微组织及力学性能验证与分析。结果表明:铝合金支架的化学成分Fe元素超标,抗拉强度及硬度均符合标准,延伸率不合格。由于铸造过程中未进行有效变质处理,导致生成了粗大的共晶Si针状相、针状Al3Fe有害相,进一步恶化了合金的机械性能,降低了材料塑性;支架螺钉安装孔壁较薄,导致承载能力不足、在拆卸时受过大冲击载荷,造成支架过载断裂。Cracking occurs on the ZL101A airborne case frame of a certain type of aircraft,so the validation and analysis of macro fractures,microscopic fractures,chemical components,microscopic structure,and mechanical properties was carried out.Results show:that the Fe element of the aluminum alloy frame is over the limit,the tensile strength and hardness all meet the requirements,and the elongation rate is unqualified.The gross eutectic Si acicular phase was produced due to the effective modification treatment was not done in the casting process,acicular Al3Fe is a harmful phase,it furtherly deteriorates the mechanical properties of the alloy,reduces the material plasticity;the bracket screws are installed on the thin hole walls,which results in insufficient carrying capacity,it received excessive shock loads in dismounting process,it caused overload breakage of frames.

关 键 词：ZL101A 支架 脆性断裂 共晶硅Si相 变质处理 

分 类 号：TG292[金属学及工艺—铸造]