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首页> 外文期刊>Materialwissenschaft und Werkstofftechnik >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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The effect of the solution treatment onto the microstructure and mechanical properties of MAG pulsed welded joints from X2CrNiMoN22-5-3 Duplex stainless steels

机译：固溶处理对X2CrNiMoN22-5-3双相不锈钢MAG脉冲焊接接头组织和力学性能的影响

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摘要

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, sigma, , Laves. The modalities for obtaining a quantitative ratio of the two phases (Austenite/Ferrite) close to that of the base metal (approximate to 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.
机译：双相不锈钢焊接的冶金行为受到以下影响：降低焊接中和熔融金属熔池熔合线附近区域中的奥氏体比例，以及析出氮化物Cr2N，碳化物M23C6和金属间相sigma，Laves 。获得与母材接近的两相（奥氏体/铁素体）的定量比（大约为50％的奥氏体和50％的铁素体）的模态旨在通过选择具有以下特征的填充材料来调节焊缝的化学成分：较高的镍含量（除氮以外还促进奥氏体形成的元素），焊接过程的热循环控制以及焊后固溶处理的应用。本文探讨了这种热处理对奥氏体和铁素体之间恢复平衡以及减少合金元素偏析现象的影响。通过光学和扫描电子显微镜检查以及X射线衍射分析，突出了所施加的处理引起的微观结构变化，并且通过冲击韧性和静态拉伸试验证明了热处理对确保焊接接头质量的积极作用。

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