双相不锈钢药芯焊丝GDQA2205的研制
Development of duplex stainless steel flux-cored wire GDQA2205
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摘要: 对所研制焊丝进行气体保护焊试验,测试了焊缝金属的化学成分、金相组织、抗拉强度、点蚀率和接头的洛氏硬度、抗弯强度和冲击韧度.用金相显微镜对焊缝金相组织进行观察,用扫描电镜分析冲击断口的形貌,并且用EDS能谱仪分析夹杂物的成分.结果表明,在焊丝中加入合理的Ni和MnN,可有效地促进奥氏体的形成,使焊缝获得合理的奥氏体铁素体两相组织。还分析了耐点蚀性能和冲击韧度的影响,研究发现除化学成分外,均匀的两相组织有利于改善耐腐蚀性能;金属元素Mn,Ni,Cr等是焊接接头冲击韧度的保证。Abstract: The developed wires were used for gas metal arc welding. The chemical composition, microstructure, tensile strength and corrosive pitting rate of weld bead and Rockwell hardness, bend strength and impact toughness of welded joint were investigated. The microstructure of weld metal was analyzed by metalloscope. The impact fracture was analyzed by scanning electron microscope, and inclusions of impact fracture were analyzed by energy spectrometer. Experiment results indicated that it was effective to add rational nickel and MnN in the wire to accelerate austenite formation. The influence factors of pitting corrosion resistance and impact ductility were studied. It had been found that, besides chemical constitution, the uniform distribution of duplex phases in the weld metal could improve pitting corrosion resistance. Elements Mn, Ni, Cr etc. were the assurance of welded joint impact ductility.
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Keywords:
- duplex stainless steel /
- flux-cored wire /
- weld /
- joint performance
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期刊类型引用(7)
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百度学术
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