2A12铝合金锻坯开裂故障分析  

Analysis on Crack Trouble of 2A12 Aluminum Alloy Forging Stock

作　　者：李东东[1] 王影[2] 王世超[1] 刘涛[1] 林德健[2] 

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

出　　处：《宇航材料工艺》2015年第3期81-85,共5页Aerospace Materials & Technology

摘　　要：某产品用2A12铝合金锻坯在生产过程中发生开裂故障。本文对开裂锻坯进行了形貌观察与断口分析,并对比研究了热处理后开裂锻坯、未热处理锻坯和原材料铝棒。结果表明:开裂锻坯上的开裂模式为脆性开裂;开裂锻坯上的裂纹形成于热处理过程,形成原因应与锻造工艺控制不当导致锻坯在热处理过程中形成的粗晶有关。Several 2A12 aluminum alloy forging stocks were found to have fractured in the production process. In this article, morphological observation and fraction analysis were employed to investigate the reason why cracking phenomenon happened. In addition, the article studied comparatively the cracking forging stock with heat treatment, the forging stock without heat treatment and the aluminum bar. The results indicated that the fracture mode of the forg- ing stock belong to brittle fracture, and the crack formed in the heat treatment process and related to the coarse-grain generated in the treatment process due to the improper forging process.

关 键 词：2A12铝合金 锻坯 开裂故障 脆性开裂 粗晶 

分 类 号：TG146.2[一般工业技术—材料科学与工程]