V、Nb对耐火实心焊丝显微组织及力学性能的影响

V、Nb对耐火实心焊丝显微组织及力学性能的影响 Effect of V and Nb on microstructure and mechanical properties of refractory solid welding wire 周秀 ZHOU Xiu 1 2 first-author 肖辉英 XIAO Huiying 1 2 朱腾辉 ZHU Tenghui 2 3 钱广禄 QIAN Guanglu 2 3 天津市金桥焊材集团股份有限公司 天津市金桥焊材集团股份有限公司 Tianjin Key Laboratory of Enterprise of Upmarket Equipent Manufacturing and Welding Material and Technology Tianjin Key Laboratory of Enterprise of Upmarket Equipent Manufacturing and Welding Material and Technology 天津市高端装备制造焊接材料及技术企业重点实验室  天津市高端装备制造焊接材料及技术企业重点实验室  Tianjin Gold en Bridge Welding Materials Group Co.,Ltd. Tianjin Gold en Bridge Welding Materials Group Co.,Ltd. 天津市永昌焊丝有限公司 天津市永昌焊丝有限公司 Tianjin Yongchang Welding Wire Co.,Ltd. Tianjin Yongchang Welding Wire Co.,Ltd. 设计了3组不同合金成分体系的耐火实心焊丝,并进行了对比试验。通过化学成分检测、拉伸试验、光学显微镜及扫描电子显微镜等试验方法,并结合力学性能及金相组织试验结果,分析V、Nb元素对耐火实心焊丝熔敷金属显微组织及力学性能的影响,探讨了微观组织与力学性能之间的关系。结果表明,成分中添加V、Nb在高温下均可促进碳化物的弥散析出,增强析出强化作用,并且增强纤维组织在高温下的稳定性,从而显著增加熔敷金属在600℃的高温屈服强度,但Nb元素的添加会明显降低熔敷金属的低温冲击韧性。采用Mo+V合金体系的实心焊丝在保证高温屈服强度的基础上能够得到良好的低温冲击韧性。 A series of refractory solid welding wire with different alloy composition were designed and the contrast experiment was conducted. By means of various test methods including chemical composition test, tensile test, optical microscope and scanning electron microscope, combining the experimental results of mechanical properties and microstructure, the effect of V and Nb on the microstructure and mechanical properties of deposited metal of refractory solid welding wire was analyzed, and the relationship between the microstructure and mechanical properties was analyzed. The results show that at high temperatures the addition of V and Nb can promote dispersed precipitation of carbide, enhance the precipitation strengthening effect and the stability of microstructure, thus effectively increases the high-temperature yield strength of deposited at 600 ℃, but the addition of Nb obviously reduces the low-temperature impact toughness of deposited metal. Solid welding wire containing Mo and V can guarantee good high-temperature yield strength and favorable low-temperature impact toughness. 耐火实心焊丝 显微组织 力学性能 高温屈服强度 refractory solid welding wire microstructure mechanical properties high-temperature yield strength TG422.3 2022-03-08 10 51