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首页> 外文期刊>Journal of Materials Engineering and Performance >Investigation of Double-Pulsed Gas Metal Arc Welding Technique to Preclude Carbide Precipitates in Aerospace Grade Hastelloy X
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Investigation of Double-Pulsed Gas Metal Arc Welding Technique to Preclude Carbide Precipitates in Aerospace Grade Hastelloy X

机译：调查双脉冲气金属弧焊技术，排除碳化物沉淀的航空升级摇摆

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摘要

Hastelloy X develops hot fissuring during fusion welding, which could be precluded using single-pulsed gas metal arc welding (SP-GMAW) and double-pulsed gas metal arc welding (DP-GMAW). The outcome of this research is to provide a better insight into microstructural characteristics, and mechanical properties of Hastelloy X welded by GMAW, SP-GMAW, and DP-GMAW techniques. GMAW depicts the cellular dendrites, whereas DP-GMAW and SP-GMAW displayed fine equiaxed dendrites. Mo-rich segregation is identified in the interdendritic region of GMAW owing to high solidification time. Mo-rich segregation is reduced for SP-GMAW, whereas it is completely precluded for DP-GMAW due to the existence of refined grain. The development of M3C (Fe2MoC) and M6C (Fe2Mo4C) carbide precipitates is identified in GMAW and SP-GMAW. But, DP-GMAW displays the absence of Mo-rich carbides and the development of Mo1Ni4 intermetallic precipitates. DP-GMAW provides better joint efficiency (96.32%), UTS, and ductility, which is followed by SP-GMAW and GMAW. DP-GMAW shows higher mean microhardness (7.31% and 3.52%) and impact toughness (49.01% and 26.67%) on comparison with GMAW and SP-GMAW, respectively. Inverse pole figure (IPF) maps of SP-GMAW weldment confirmed that the broad and straight dendrites formed tend to grow along < 100 > direction during the entire solidification process. DP-GMAW also displays the major intensity shift from < 100 > to < 111 > direction. Evidence for the formation of equiaxed grains of random orientation along with dendrites is confirmed by IPF maps from DP-GMAW weldments. The presence of these equiaxed grains in the DP-GMAW weldment might have contributed to the enhancement of tensile properties.
机译：哈氏合金X在熔焊过程中会产生热裂纹，这可以通过单脉冲气体保护焊（SP-GMAW）和双脉冲气体保护焊（DP-GMAW）来避免。本研究的结果旨在更好地了解通过GMAW、SP-GMAW和DP-GMAW技术焊接的哈氏合金X的微观结构特征和机械性能。GMAW显示的是细胞树突，而DP-GMAW和SP-GMAW显示的是细小的等轴树突。由于凝固时间较长，GMAW枝晶间区域出现富钼偏析。SP-GMAW的富钼偏析减少，而DP-GMAW由于存在细化晶粒而完全排除了富钼偏析。在GMAW和SP-GMAW中发现了M3C（Fe2MoC）和M6C（Fe2Mo4C）碳化物沉淀的形成。但是，DP-GMAW显示出富钼碳化物的缺失和Mo1Ni4金属间化合物沉淀的发展。DP-GMAW具有更好的接头效率（96.32%）、UTS和延展性，其次是SP-GMAW和GMAW。DP-GMAW的平均显微硬度（7.31%和3.52%）和冲击韧性（49.01%和26.67%）分别高于GMAW和SP-GMAW。SP-GMAW焊件的反极图（IPF）图证实，在整个凝固过程中，形成的宽直枝晶倾向于沿<100>方向生长。DP-GMAW还显示了从<100>到<111>方向的主要强度变化。DP-GMAW焊接件的IPF图证实了随机取向的等轴晶粒和枝晶的形成。DP-GMAW焊件中存在这些等轴晶粒可能有助于提高拉伸性能。

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