Research on development and mechanical properties of Mn-Mo-Cr flux cored wire for high strength steel

Mn-Mo-Cr系高强钢药芯焊丝研制及其力学性能研究 Research on development and mechanical properties of Mn-Mo-Cr flux cored wire for high strength steel 魏文逸 WEI Wenyi 1 first-author 裘荣鹏 QIU Rongpeng 1 辽宁装备制造职业技术学院 辽宁装备制造职业技术学院 Liaoning Equipment Manufact uring Vocational and Technical College Liaoning Equipment Manufact uring Vocational and Technical College 为研制与Q960高强钢相适应的焊接材料,通过调节Mn-Mo-Cr系高强钢药芯焊丝内不同元素配比,分析元素对焊接接头显微组织及力学性能的影响机理,确定各元素的最优含量配比。采用正交试验法,对焊接试样接头进行拉伸试验、冲击试验和显微组织分析。结果表明,综合考虑焊接接头的拉伸性能及冲击性能,焊缝内Mn、Mo、Cr元素含量的最佳配比为:w(Mn)=1.2%,w(Mo)=1.5%,w(Cr)=1.2%。随着Mn和Mo元素含量的提升,接头显微组织由先共析铁素体向针状铁素体及马氏体和贝氏体转变。固溶强化和相变强化作用使得焊接接头的抗拉强度逐渐提升,但断后延伸率逐步下降。针状铁素体含量最大的焊缝具有最优的冲击韧性。 In order to develop the welding materials for Q960 high strength steel,by adjusting the ratio of different elements in Mn-Mo-Cr high strength steel flux cored wire,the influence mechanism of element on the microstructure and mechanical properties of welded joint was analyzed,and the optimum element proportion was achieved. The tensile test,impact test and microstructure analysis were conducted based on the orthogonal test. The results show that considering the tensile property and impact property,the optimum ratio of Mn,Mo and Cr in the weld is 1.2 wt.%,1.5 wt.% and 1.2 wt.%.When the Mn and Mo element content increase,the microst-ructure of welded joint transfers from proeutectoid ferrite into acicular ferrite,martensite and bainite. The solution strengthening and phase transformation strengthening make the tensile strength of welded joint improve gradually,but elongation reduces gradually. The weld with the largest acicular ferrite content has the best impact toughness. 高强钢药芯焊丝 含量配比 正交试验法 力学性能 显微组织 high strength steel flux cored wire ratio of content orthogonal test mechanical property microstructure TG422.3 2022-03-08 11 50