The effect of the solution treatment onto the microstructure and mechanical properties of MAG pulsed welded joints from X2CrNiMoN22‐5‐3 Duplex stainless steels
The effect of the solution treatment onto the microstructure and mechanical properties of MAG pulsed welded joints from X2CrNiMoN22‐5‐3 Duplex stainless steels
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固溶处理对 X2CrNiMoN22-5-3 双相不锈钢 MAG 脉冲焊接头显微组织和力学性能的影响
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发表时间：
2017
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通讯作者：
C. Crăciunescu
中科院分区：
文献类型：
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作者：
I. Mitelea;I. Uțu;Sorin Dumitru Urlan;C. Crăciunescu
焊缝和熔池熔合线附近奥氏体比例的降低以及氮化物Cr2N、碳化物M23C6和金属间相σ、χ、Laves的析出均影响双相不锈钢焊接的冶金行为。获得接近母材（~ 50%奥氏体和50%铁素体）的两相（奥氏体/铁素体）定量比的方法旨在通过选择具有较高镍含量的填充材料（除氮外促进奥氏体形成的元素）、焊接过程的热循环控制和焊后溶液处理的应用来调整焊缝的化学成分。本文探讨了这种热处理对奥氏体和铁素体平衡恢复和合金元素偏析现象减少的影响。通过光学、扫描电镜和X射线衍射分析，发现了热处理引起的显微组织变化，并通过冲击韧性和静态拉伸试验证明了热处理对保证焊接接头质量的积极作用。
The metallurgical behaviour by Duplex stainless steels welding is affected by reducing the austenite proportion in weld and in the area adjacent to the fusion line of the molten metal bath and also by the precipitation of nitrides Cr2N, carbides M23C6 and intermetallic phases, σ, χ, Laves. The modalities for obtaining a quantitative ratio of the two phases (Austenite/Ferrite) close to that of the base metal (∼50 % Austenite and 50 % Ferrite) aims to adjust the chemical composition of the weld by selecting a filler material with a higher nickel content (the element which beside nitrogen promotes the austenite formation), the heat cycle control of the welding process and the application of a post‐welding solution treatment. The present paper explores the effect of such heat treatment on balance restoring between austenite and ferrite and the reduction of the alloying elements segregation phenomena. By optical and scanning electron microscopy examinations and also X‐ray diffraction analyses the microstructural changes induced by the applied treatment are highlighted and by impact toughness and static tensile tests is demonstrated the positive effect of the heat treatment onto the ensuring of the welded joints quality.