摘要
采用微合金化方式，通过焊条药皮向焊缝过渡微量合金元素来提高Ｓｉ－Ｍｎ－Ｍｏ系６０ｋｇ级结构钢焊条焊缝金属低温韧性。试验结果表明：仅向焊缝过渡大约０．０２１％Ｔｉ时，焊缝韧性就有较大的改善。当焊缝中同时含有约０．０２１％Ｔｉ和０．００４％Ｂ时，焊缝韧性可达到国外同类含Ｎｉ焊条的水平，这主要与焊缝的组织形态的改变有关，此时焊缝的显微组织以针状铁素体（ＡＦ）为主，而沿柱状晶分布的先共析铁素体（ＰＦ）和侧板条铁素体（ＦＳＰ）几乎消失，此外，Ｂ对焊缝金属能起到净化和变质作用，但联合加入Ｔｉ－Ｎｂ或Ｔｉ－Ｖ时，均使焊缝韧性降低。
The possibility of increasing the low temperature toughness of weld metal of Si-Mn-Mostructural steel electrode for 60kg/mm2 grade has been investigated by means of micro-alloy-ing method to introduce the micro-alloying elements through coating of an electrode intoweld metal. The experimental results show that the toughness at low temperature of weldmetal may be improved markedly by means of coating an electrode and introducing about0.021%titanium into weld metal. And,if both 0. 021%titanium and 0. 004%boron are introduced into weld metal together,the level of the toughness abroad for the same type ofelectrodes contained nickel may be reached.This is principally connected with the change ofthe microstructural morphology of weld metal.In this case,the microstructure of weld metalis mainly acicular ferrite(AF ,and the pro-eutectoid ferrite (PF) distributed along thecolumnar grain boundary as well as ferrite side plate(FSP) nearly disappear。 Besides’ heboron has the function of purity and modification for the weld metal.But,when both ele-ments of titanium and niobium or both elements of titanium and vanadium are introduced together into weld metal,the toughness of weld metal is decreased.
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
1995年第8期59-64,共6页
Journal of Xi'an Jiaotong University
