摘要
采用自行研制的金属粉芯型药芯焊丝对WQ960高强钢进行了焊接试验。通过拉伸试验、冲击试验等方法研究了药芯成分中分别加入合金元素Ni和Mo对焊接接头力学性能的影响,并结合金相组织观察对其影响机理进行了合理的解释。结果表明:随着焊缝中Ni含量的增加,焊接接头的抗拉强度、常温和-20℃冲击功均先增大后减小,伸长率减小。这是由于Ni的加入使焊缝组织出现马氏体,贝氏体和针状铁素体含量增多导致的。随着焊缝中Mo含量的增加,焊接接头的抗拉强度增加,但伸长率、常温和-20℃冲击功均减小。这是由于Mo促进贝氏体转变,焊缝中贝氏体含量增多的缘故。焊缝金属中Ni含量的最佳范围为0.81%~1.22%,Mo的最佳加入量为1.52%。
The welding tests of WQ960 high strength steel were carried out by using the self developed metal powder flux cored wire. The effect of adding alloying elements Ni and Mo respectively in core composition on the mechanical properties of the welded joint was studied through tensile test, impact test, etc, and the mechanism of the effect was explained reasonably combined with metallograhpic observation. The results show that with the increase of Ni content in the weld, the tensile strength, impact energy at room temperature and -20℃ of the welded joint increase at first and then decrease, and the elongation decreases. This is due to that after the addition of Ni, the martensite appears in weld structure, and the contents of bainite and acicular ferrite increases. With the increase of Mo content in the weld, the tensile strength increases, and the elongation, impact energy at room temperature and -20℃ of the welded joint decrease. This is due to that Mo promotes bainite transformation and the bainite content in weld increases. The reasonable addition mounts of Ni and Mo are 0.81%-1.22% and 1.52% respectively.
出处
《热加工工艺》
CSCD
北大核心
2017年第19期59-62,共4页
Hot Working Technology
关键词
NI
MO
金属粉芯型药芯焊丝
高强钢
冲击性能
Ni
Mo
metal powder flux cored wire
high strength steel
impact properties
