摘要
在Gleeble-1500试验机上模拟了高频感应焊(HFW)升温和挤压过程。利用二次挤压变形法测定两种不同Nb含量的轴管钢模拟再结晶行为,同时建立变形温度与变形抗力的关系。通过金相组织、显微硬度和EBSD技术表征实际焊管接头的再结晶程度。结果表明,随着Nb含量的降低,高温变形抗力降低,模拟焊后再结晶温度向低温转移。经实际接头验证,随着Nb含量的降低,近缝区最高硬度降低,晶粒细化,大角度晶界比例增加,焊管扩口和压扁能力得到改善。
In this paper, the Nb-microallyed shaft tube steels are chosen.The process of temperature rise and extrusion in high frequency induction welding （HFW） are stimulated on Gleeble-15OO.The stimulation of welding recrystallization behaviors in two shaft tube steels with different Nb content are carried out by secondary extrusion deformation method to set up the relationship between the distortion temperature and resistance to deformation.The recrystallization degree of actual welded joints in steel is analyzed by metallographic structure,microhardness And EBSD.The results show that the resistance to deformation in high temperature reduces as the Nb content decrease,which makes the recrystallization temperature after simulation welding moves to much lower point.The behavior of actual joints is proved that as the Nb content drops,the maximization microhardness of welded joints near weld zone reduces, the grains refine, the flaring and flattening ability are improved ,and the proportion of higtl-angle boundary （≥ 15°） increases in case of mucll lower Nb content, which is the phenomenon of recrystallization after HFW.
出处
《电焊机》
2015年第3期1-5,共5页
Electric Welding Machine
