ER55-B6焊丝焊接12Cr1MoV耐热钢的组织与断口形貌
Microstructure and Fracture Morphology of 12Cr1MoV Heat-resistant Steel Welded with ER55-B6 Welding Wire
罗昌森， 罗 宏， 徐晓东， 杨元意
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作者单位：四川理工学院 材料与化学工程学院， 四川 自贡 643000）
中文关键字：ER55-B6焊丝； 12Cr1MoV钢； 显微组织
英文关键字：ER55-B6 welding wire; 12Cr1MoV steel; Microstructure
中文摘要：应用ER55-B6焊丝焊接12Cr1MoV耐热钢，焊后进行740 ℃回火热处理，并对其焊接接头进行了组织分析、强度和维氏硬度测试，以及断口形貌观察。结果表明，回火处理后的焊缝及热影响区组织为铁素体、球化珠光体及均匀分布的第二相质点，相分布合理；断口形貌显示大部分为韧窝，属韧性断裂，抗冲击性好。应用ER55-B6焊丝焊接12Cr1MoV钢，能满足耐热钢焊接性能要求。
英文摘要：ER55-B6 welding wire was used for welding 12Cr1MoV heat-resistant steel, the steel was tempered at 740 ℃ after welding. The strength and hardness of the welding were measured. The morphology of weld fracture was observed by SEM. The results show that the weld seam and heat affected zone after tempering are composed of ferrite, spheroidization of pearlite and uniform distribution of second phase particles, the distribution of second phase is reasonable. The fracture surface shows that most of the dimple is ductile fracture, so with good impact resistance. Using ER55-B6 welding wire welding 12Cr1MoV steel can meet the performance requirement of welding heat-resistant steel.