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Development of shielded metal arc welding electrodes to achieve carbide-free bainitic weld microstructures
Welding in the World ( IF 2.1 ) Pub Date : 2020-10-07 , DOI: 10.1007/s40194-020-00987-z
Sudharsanan Sundaram , G. D. Janaki Ram , Murugaiyan Amirthalingam

Carbide-free bainite (CFB) microstructures containing a mixture of nano-sized retained austenite laths and bainitic ferrite exhibit a good combination of strength, ductility, and toughness. In this work, an attempt was made to identify welding electrode compositions with a carbon content of about 0.35 to 0.5 wt.% to achieve carbide-free bainite microstructures in multi-pass shielded metal arc welds. Suitable alloy compositions were designed using a commercial neural network–based database, considering thermodynamic parameters such as allotropic phase boundary (XTo), ΔGɣ-ɑ (driving force for transformation) and martensite start temperatures. Three different alloy compositions were identified using this approach. Shielded metal arc welding (SMAW) electrodes were fabricated with the compositions identified and the samples extracted from the weld deposits were used for dilatometer studies, metallurgical characterisation, and mechanical property evaluation. Based on the results, an optimised electrode composition and welding parameters were identified to stabilise the carbide-free bainitic microstructures in weld metal.



中文翻译:

开发屏蔽金属电弧焊电极以实现无碳化物的贝氏体焊缝微观结构

包含纳米尺寸残余奥氏体板条和贝氏体铁素体的混合物的无碳化物贝氏体(CFB)微结构表现出强度,延展性和韧性的良好组合。在这项工作中,试图确定碳含量为约0.35-0.5wt。%的焊接电极组合物,以在多道屏蔽金属电弧焊中获得不含碳化物的贝氏体微观结构。考虑到热力学参数,如同素异形相界(X To),ΔGɣ-ɑ,使用商业神经网络数据库设计合适的合金成分(转变的驱动力)和马氏体起始温度。使用这种方法确定了三种不同的合金成分。使用确定的成分制造屏蔽金属弧焊(SMAW)电极,将从焊缝中提取的样品用于膨胀计研究,冶金表征和机械性能评估。根据结果​​,确定了优化的电极组成和焊接参数,以稳定焊接金属中无碳化物的贝氏体微观结构。

更新日期:2020-10-07
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