摘要
Al Li Cu合金TIG焊后接头软化较为严重,强度仅为母材的55%,为了解决这一问题,研究了焊后固溶+时效热处理对接头组织及力学性能的影响。结果表明,焊后热处理可提高接头的强度,焊态接头经520℃固溶1h+150℃时效10h后强度系数高于0.64。但在接头强化的同时,母材却受到了一定程度的弱化,试件经520℃固溶1h+176℃时效10h后,母材处的强度弱化到初始强度的31%,随着时效温度的提高和时效时间的延长,试件母材部位的弱化程度随之增大。
The strength of Al-Li-Cu alloy TIG welded joint is lower, and only is 55% of parent material strength, resulting from being softened during welding. To solve the problem, this paper studied the effect of the solution and ageing heat treatment on the microstructures and properties of Al-Li-Cu TIG welded joint. The results show that strength coefficient of the joint is increased to 0.64 after heat treatment at 520°C for 1 h and 150°C for 10 h. However, the strength of parent material is reduced after heat treatment. Parent material strength is decreased to 31% of original strength after heat treatment at 520°C for 1 h and 176°C for 10 h. As ageing temperature and time increasing, the damaged degree for parent material rises.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2003年第6期23-25,50,共4页
Transactions of The China Welding Institution
基金
国家863基金资助项目(2002AA724040)
关键词
Al-Li-Cu合金
TIG焊
铝合金
焊接接头
组织
力学性能
热处理
Aluminum alloys
Heat treatment
Lithium alloys
Mechanical properties
Microstructure
Strength of materials
Tungsten
Welds
