摘要
采用球铁作为基体材料,在不预热情况下通过增加过渡合金堆焊层,再选用专用焊丝进行堆焊试验。由于过渡焊丝中的Ni、Cr提高了奥氏体的稳定性,产生FeNi缓解了高硬度焊丝中碳化物内产生的残余应力,减缓硬度梯度,多次堆焊加热使其热应力在该区域得到缓释,产生裂纹倾向下降。同时又由于专用焊丝中的C、V能形成碳化物,因此提高了堆焊层的硬度。
Using nodular cast iron as matrix material, in the case of no preheating and thickening transition alloybead welded layer as well as choosing special welding wire the laser bead welding was investigated. For the reasonthat Ni and Cr in the transition wire increase stability of austenite, that FeNi relaxes the residual stress in carbidein high hardness welding wire, that hardness gradient retarded and that multiple-heating for bead welding relax thermalstress, the tendency to crack will be reduced. Meanwhile, C, V in the special welding wire can form carbide, sothe hardenss of the bead welded layer will be increased.
出处
《热处理》
CAS
2005年第1期25-29,共5页
Heat Treatment
关键词
焊丝
送丝
堆焊层
组织性能
合金
碳化物
奥氏体
高硬度
专用
缓释
wire feed bead welding
nodular cast iron
transition alloy bead welded layer
cracking resistance
structure and performance
