摘要
对MGH956合金板材的电子束焊和氩弧焊接头组织及其室温～1100℃的拉伸性能进行了研究。采用光学显微镜和扫描电镜对接头组织和拉伸断口的检验结果表明:电子束焊和氩弧焊使母材中原有超细的氧化物弥散强化相明显粗化,接头组织中有更粗大、且取向与母材原始晶粒取向相垂直的晶粒生成,以及不可避免地留有孔洞。组织上的改变导致接头不仅800℃以上的高温强度明显降低,而且低温脆性倾向明显加剧。MGH956合金板材电子束焊和氩弧焊的接头组织和拉伸性能表明,电子束焊具有明显的优势,具备工程应用的潜力。
The microstructures of MGH956 sheet joints welded by EB and TIG methods and tensile properties from room temperature to 1100℃ were studied.Results showed that the dispersoids,which were superfine in original alloy matrix,coarsened obviously after undergoing welding cycle.More coarse grains with the orientation perpendicular to that of the base alloy were formed and holes were left inevitably within joint microstructures.The changes in microstructure resulted in both the significant decrease of joint′s high temperature（above 800℃） strength and the much higher brittleness at low temperature.Based on the comparison of the microstructures and tensile properties of the joints welded using EB to that of joints using TIG,it is verified that EB has more advantage than TIG for the welding of MGH956 sheet,and thus EB possesses the engineering potential.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2011年第4期33-38,共6页
Journal of Aeronautical Materials
