7A04铝合金锻坯开裂原因分析  被引量:2

Analysis on Cracking of 7A04 Aluminum Alloy Forging Stock

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作  者:陈卫娜 卓航 李炎 李阿妮[1] 王影[2] CHEN Wei-na;ZHUO Hang;LI Yan;LI A-ni;WANG Ying(China Academy of Launch Vehicle Technology Logistics Center,Beijing 100076,China;Aerospace Research Institute of Materials&Processing Technology,Beijing 100076,China)

机构地区:[1]中国运载火箭技术研究院物资中心,北京100076 [2]航天材料及工艺研究所,北京100076

出  处:《失效分析与预防》2022年第4期260-263,共4页Failure Analysis and Prevention

摘  要:7A04铝合金锻坯在锻造过程中发生开裂,通过对锻坯裂纹进行断口宏观及微观观察、能谱分析、金相组织检查,并与人工断口进行对比分析,确定锻坯开裂原因。结果表明:锻坯开裂是由于锻坯内存在金属氧化物夹杂造成的;开裂锻坯断面上存在大量的氧化物夹杂,夹杂物以氧化铁为主,同时含有少量氧化铝和氧化镁。以氧化铁为主的氧化物夹杂的形成应与外来氧化铁坠入熔体被氧化膜包裹有关。Several 7A04 aluminum alloy forging stocks were found to have fractured in the production process.In this paper,macro and micro observation on the fracture surface,energy spectrum analysis,metallurgical structure examination were carried out to analyze the failure mode and cause.The fracture surfaces was also compared with man-made fracture surfaces.The results show that there is a mass of inclusions on the fracture surface,which mainly consis of iron oxide,along with little magnesium oxide and aluminium oxide.The formation of inclusions are rich in iron oxide may attrihutes to the foreign iron oxide droped in the melt,which was enveloped by oxidation film.

关 键 词:7A04铝合金 锻坯 自由锻 开裂 夹杂物 

分 类 号:TG319[金属学及工艺—金属压力加工]

 

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