风机叶轮用0Cr13Ni5Mo钢焊条的研制

Development of 0Cr13Ni5Mo steel matching electrode used on fan impeller

根据风机叶轮焊接接头强韧性要求,利用组织匹配原则设计焊芯,用药皮过渡方法补充选用焊芯与设计焊芯成分间的差距,并通过金相分析、力学性能及工艺性能测试等方法,研制了0Cr13Ni5Mo钢专用焊条.结果表明,用药皮过渡方式补充选用焊芯与设计焊芯成分之差的方法,既可验证所设计焊芯能否达标,也可用于指导小批量生产特种焊条;1号、2号、3号焊条所得接头的焊缝区和HAZ组织均为回火索氏体+板条马氏体+残余奥氏体+二次析出相,其对应接头力学性能均高于4号传统焊条;2号焊条工艺性最好,3号综合性能最好,可作为0Cr13Ni5Mo钢专用焊条.

According to the requirements for mechanical property of fan impeller welded joints,cored wire was designed based on the principle of microstructure match.The component gap between the tested cored wire and designed cored wire was filled by alloying elements transition of the coating.An electrode special for 0Cr13Ni5Mo steel was developed after metallurgical analysis,mechanical and processing property testing.The results show that the method of filling the component gap between the tested cored wire and designed cored wire by alloying elements transition of the coating could verify whether the designed cored wire achieved the purpose and also guide the small batch production of special electrodes.The microstructure of the weld and heat-affected zone(HAZ) made with the No.1,No.2 and No.3 electrodes consisted of tempered sorbite,lath martensite,residual austenite and quadratic precipitated phase,and the mechanical properties of the resultant joints were better than those with the No.4 electrode.The No.2 electrode had the best processing property,and the No.3 electrode had the best comprehensive property which could be used as a special electrode for 0Cr13Ni5Mo steel.