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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Mo-rich Fillers in Pulsed Current Gas Tungsten Arc Welding of Inconel 718 for Improved Strength and Hot Corrosion Resistance
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Effect of Mo-rich Fillers in Pulsed Current Gas Tungsten Arc Welding of Inconel 718 for Improved Strength and Hot Corrosion Resistance

机译：富含Mo富含填料在脉冲电流钨弧焊弧焊中的效果718，提高强度和热腐蚀性

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摘要

The formation of Laves phase in the fusion zone of Inconel 718 welds is considered to be detrimental and requires major attention, as this phase deteriorates the mechanical properties and high-temperature corrosion resistance. This present study addresses the use of current pulsing technique on the gas tungsten arc welding of 5-mm-thick Inconel 718 plates. Nb-free fillers, namely ERNiCrMo-10 and ERNiCrMo-14, are chosen for joining these plates. Microstructure studies revealed the segregation of Mo-rich phases at the inter-dendritic regions of the fusion zone of both the weldments. Further, the occurrence of detrimental Laves phase was minimized while employing Mo-rich fillers. It is inferred from the tensile studies that the fractures occurred in the parent metal for ERNiCrMo-10 filler and at the fusion zone while employing ERNiCrMo-14. Room-temperature Charpy impact studies also affirm that the impact toughness of ERNiCrMo- 10 welds is significantly greater than that of ERNiCrMo-14. Hot corrosion studies were performed on the coupons by exposing them to a synthetic molten salt environment comprising Na2SO4 + 60% V2O5 at 800 degrees C for 50 h. Owing to the presence of higher amounts of Cr2O3 and NiO, both fusion zones exhibited better hot corrosion resistance than the parent metal. The novel outcome of the study reiterates that with the use of current pulsing and Mo-rich fillers, the detrimental phase shall be controlled.
机译：Inconel 718焊缝的融合区中的熔化区的形成被认为是有害的并且需要重大关注，因为该相使机械性能和高温耐腐蚀性劣化。本研究解决了电流脉冲技术对5毫米厚的418板的气体钨弧焊。选择Nb的填料，即Ernicrmo-10和厄尼人-14，用于加入这些板。微观结构研究揭示了在两种焊件的融合区的树突间区域处的MO富含阶段的分离。此外，在采用富含Mo的填料的同时最小化有害的熔化液相的发生。从拉伸研究中推断，即在使用ERNICRMO-14的同时在母金属中和融合区的母体金属中发生骨折。室温夏比的影响研究还确认厄尼人 - 10焊缝的冲击韧性明显大于ERNICRMO-14。通过将其暴露于含有Na 2 SO 4 + 60％V2O5的合成熔融盐环境，在800℃下将热腐蚀研究进行热腐蚀研究。由于存在较高量的CR2O3和NIO，这两个融合区都表现出比母金属更好的热腐蚀性。该研究的新结果重申，通过使用电流脉冲和富含MO的填充物，应控制有害阶段。

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