摘要
研究了含铜时效钢气体保护焊热影响区的组织与性能。结果表明,在试验所用热输入范围内(1.2—2.3kJ/mm),含铜时效钢具有良好的焊接性能。焊接接头的拉伸强度同母材相比没有明显差异,且HAZ拉伸强度对热输入变化不敏感;焊接热影响区具有较高的冲击韧性,熔合线是HAZ中韧性最差的部位;和传统调质型船体用钢相比,含铜时效钢HAZ硬化和软化现象不明显;热输入对含铜时效钢粗晶区组织影响显著,随着热输入的增大,粗晶区组织由细板条贝氏体向粗大的粒状贝氏体转变。
Microstructure and property of gas shielded arc welded copper - bearing aging steels HAZ were studied. The results show that copper - bearing aging steel exhibits good weldability in the range of heat input from 1.2 to 2.3 kJ/mm. There is no significant difference between tensile strength of welded joints and base metal and tensile strength of HAZ is not sensitive to the change of heat input. HAZ achieves high impact toughness and fusion line belongs to the worst impact toughness region. Hardening and softening phenomena of copper - bearing aging steels are not obvious compared to traditional quenched and tempered steels. Heat input has great effect on the microstructure of coarse - grain region of copper - bearing aging steels. Microstructure of coarse - grain region changes from thin lath bainite to coarse granular bainite with the increase of heat input.
出处
《焊接》
北大核心
2005年第9期43-47,共5页
Welding & Joining
