焊接工艺对不同基体HT250粗晶区组织性能的影响  

Influence of welding processes on the performance of microstructure with different base HT250 in coarse grain zones

作　　者：王国凡[1] 汤爱君[1] 赵中魁[1] 秦希峰[1] 

机构地区：[1]山东建筑大学材料科学与工程学院,山东济南250101

出　　处：《华中科技大学学报（自然科学版）》2008年第3期28-31,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

摘　　要：针对大中型铸件先焊补后退火、焊补中出现裂纹的问题，利用铸铁消除白口化退火得到更多的铁素体基体，增加其塑性，研究了在不同焊接电流、不同焊缝长度、不同堆焊工艺等焊接经860℃消除白口化退火的HT250铸铁试板的粗晶区组织、HV硬度和焊接应力大小等．结果表明：当焊接电流在100～110A、焊接速度为180mm／min、焊缝长度不超过40mm时，HT250铸铁在860℃消除白口化退火后粗晶区的组织为珠光体和铁素体组织，消除白口化退火焊接与热焊工艺焊接残余应力基本相同．Were studied the microstructure, HV hardness, welding stress of coarse grain zones of HT250 after annealing of eliminating white at 860 ℃ at different currents, different length of weld beads, and different welding processes. The results show that the microstructures of HT250 in coarse grain zones after annealing of eliminating white at 860 ℃ are pearlite and ferrite when the current is 100～110 A, the welding speed is 180 mm/min, and the length of weld bead is less than 40 mm. The welding residue stress in the iron after annealing of eliminating white is same with that of heating welding basically.

关 键 词：退火焊接 粗晶区组织 HT250铸铁 白口化退火 

分 类 号：TG401[金属学及工艺—焊接]