摘要
对6N01-T5铝合金焊接接头进行了不同温度的热矫形,研究了矫形温度对接头微观组织及力学性能的影响规律。结果表明,250℃内加热时接头强度和焊缝区硬度有微量上升,HAZ和母材区硬度逐渐变大;高于250℃时强度和硬度开始下降,软化区范围加宽,分别向母材和淬火区方向延伸,高温下性能恶化严重;150℃-00℃加热时易发生弯断,且弯断角随温度升高而减小。室温时,接头母材区析出相为GP区和β″,硬度值较低,热影响区软化区晶内在只有粗大析出相;250℃加热时,母材区开始析出β＇相，在β″和β＇的析出转变期接头硬度与强度出现峰值,软化区因重新析出β＇/β″相得到强化,拉伸断于焊缝;450℃加热时,接头处于严重过时效状态,无弥散析出相,硬度和强度降低。
The 6N01-T5 aluminum alloy is conducted with the thermal orthopedics in different temperatures and the effect of thermal orthopedic temperature on the microstructures and mechanical properties of welded joints is investigated. The results show that the microhardness of weld zone and the strength of welded joints are increased slightly within 250 ℃ heating temperature, and the micorhardness of HAZ and base metals increase gradually. When the heating temperature is higher than 250 ℃, the strength and micorhardness decrease,the range of soften area widens and extends in the directions of base metals and quenching zone,and the properties deteriorates seriously under the high temperature. Fracture occurs easily when heating temperature is between 150 ℃ to200 ℃ and its angle reduces as the temperature increases. At indoor temperature,the precipitated phases are mainly composed of GP zone and β＂ phases and the microhardness is a little lower,the coarse precipitated phases appear in the soften area and HAZ zone.When heating temperature is 250 ℃,the β′ phases are precipitated in the base metal and the peak values of microhardness and strength appear during the periods between of β＂ phase and β′ phase,and the soften area is strengthed because the β＂/β′ phases reprecipitate. The fracture appears in the weld zone. When heating tempeature is 450 ℃,the welded joints are in serious overaging condition and have no precipitaed phases and the microhardness and strength decline.
出处
《电焊机》
2016年第5期101-105,共5页
Electric Welding Machine
关键词
6N01铝合金
焊接接头
热矫形
加热温度
力学性能
微观组织
6N01 aluminum alloy
welded joints
thermal orthopedicc
heating temperature
mechanical properties
microstructre
