通过药皮过渡添加B,研究了微量B对440MPa级焊条熔敷金属低温冲击韧性的影响.试验发现,冲击韧性对B含量的变化较敏感,同时当焊缝中Ti含量不同时,B含量的影响也不同.当Ti含量为0.01%～0.04%(w)时,B含量在30×10-6(w)左右时韧性最好;当Ti含量为0.04%～0.07%时,B含量在(40～90)×10-6范围内韧性最好.B含量适中时熔敷金属组织几乎全是均匀细小的针状铁素体,B含量过低组织中出现大量的先共析铁素体,B含量过高则会生成沿原奥氏体晶界分布的粒状贝氏体和上贝氏体.
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