CMT电弧增材制造2319铝合金微观组织与力学性能分析
Microstructure and mechanical properties analysis of CMT arc-additive manufactured 2319 aluminum alloy
王建国 1丛福官 1陈岩 1杨瑞青 1满正良 1任思蒙 2张兴禹 1张春龙1
作者信息
- 1. 东北轻合金有限责任公司,黑龙江 哈尔滨 150001
- 2. 中铝材料应用研究院有限公司应用中心,北京 100000;哈尔滨工程大学超轻材料与表面技术教育部重点实验室,黑龙江 哈尔滨 150001
- 折叠
摘要
采用CMT(冷金属过渡)技术电弧增材制造了2319 铝合金直壁墙,并分别对沉积态和热处理态2319 铝合金组织和性能进行分析.沉积态2319 铝合金,层内区域为等轴晶组织,层间区域气孔缺陷较多,同时晶粒分布为粗大柱状晶和等轴晶的交混组织,沉积态2319 铝合金纵向抗拉强度251 MPa,横向抗拉强度255 MPa.将沉积态2319 铝合金进行热处理强化,优化固溶和时效制度,根据硬度确定最佳热处理制度:固溶温度535℃、固溶时间1h、时效温度175℃和时效时间12 h,经过热处理后的2319 铝合金,可引入高密度、细小、针状分布的θ″-Al2 Cu相,产生析出强化效应,使得合金抗拉强度达449 MPa,较沉积态提升了76%.
Abstract
The 2319-aluminum-alloy straight wall was fabricated with arc additive using CMT technology,and the microstructure and mechanical properties of 2319 aluminum alloy in deposited and heat-treated states were analyzed. For the as-deposited 2319 alloy,the intralayer zone is equiaxed crystal structure,and more porosity defects appear in the inter-layered zones. The grain distribution is a mixed one with coarse columnar and equiaxed crystals,with longitudinal tensile strength and transverse tensile strength of 251 MPa and 255 MPa respectively for the as-deposited 2319 aluminum alloy. The as-deposited 2319 aluminum alloy is strengthened by heat treatment,the solution and aging systems are optimized and the best heat-treatment system is determined based on hardness,i. e. solution at 535 ℃ for 1 h and aging at 175 ℃ for 12 h. After that,a high-density,fine and needle-like θ″Al2Cu phase can be introduced into 2319 aluminum alloy,resulting in precipitation strength-ening effect,which lifts tensile strength up to 449 MPa,76％higher than that without heat treatment.
关键词
CMT/电弧增材/2319铝合金/微观组织/力学性能Key words
CMT/arc additive/2319 aluminum alloy/microstructure/mechanical proper-ties引用本文复制引用
出版年
2024
NETL
NSTL
万方数据