摘要
通过光学显微镜、扫描电镜和透射电镜等技术,研究固溶与时效处理制度对6022汽车用铝合金微观组织及性能的影响规律。结果表明:经540℃保温0.5 h的固溶处理后,合金已发生完全再结晶,晶粒尺寸较为均匀,材料中存在部分未固溶到基体的第二相;预时效(150℃×5 min)+自然时效(72 h)处理后,其规定塑性延伸强度为129 MPa,抗拉强度为255 MPa,断后伸长率为25%,更利于成型;随后的人工时效(180℃×20 h)处理可以提高材料的强度,规定塑性延伸强度为327 MPa,抗拉强度为357 MPa,达到汽车覆盖件的使用要求。
The influence of solution and aging treatments on microstructure and properties of automotive 6022 aluminum alloy was investigated by means of optical microscope,SEM and TEM. The results indicate that the recrystallization process is completed after solution at 540 ℃ for0. 5 h,and the grain size is well distributed,and some second phase particles keep not dissolved( mainly Al_5FeSi type). The proof strength plastic elongation,tensile strength and elongation is respectively 129 MPa,255 MPa and 25% after the pre-aging( 150 ℃ × 5 min) +natural aging(72 h) process,which is benefit to the forming process. The following artificial aging(180 ℃ × 20 h),which could improve the mechanical properties to 327 MPa( proof strength plastic elongation) and 357 MPa( tensile strength) respectively,achieves the performance of automotive panels.
出处
《金属热处理》
CAS
CSCD
北大核心
2017年第7期76-79,共4页
Heat Treatment of Metals
基金
山东省重点研发计划(2015GGX102021)
作者简介
李辉(1983-),男,博士,主要从事铝合金加工过程微观组织演变及性能研究,E-mail:lhlwj8888@163.com