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首页> 外文期刊>Journal of Materials Engineering and Performance >Formation of Lamellar Carbides in Alloy 617-HAZ and Their Role in the Impact Toughness of Alloy 617/9%Cr Dissimilar Welded Joint
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Formation of Lamellar Carbides in Alloy 617-HAZ and Their Role in the Impact Toughness of Alloy 617/9%Cr Dissimilar Welded Joint

机译：在合金617-HAZ中形成层状碳化物及其在合金617/9％CR异种焊接接头的冲击韧性中的作用

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摘要

The relationship between the microstructure and impact toughness, especially the formation of the lamellar carbides and its effect on the impact toughness of theheat-affected zone of Alloy 617 (Alloy 617-HAZ), was systematically investigated. Impact test was performed on Alloy 617/9%Cr dissimilar welded joints aged for different time at 620 degrees C. The results showed that the characteristic zones of the whole welded joint revealed decreased impact toughness with increasing the aging time. The impact energies in weld metal showed high stability despite the aging process, while the Alloy 617-HAZ for all testing specimens presented the lowest impact toughness with various aging time. Meanwhile, the mixed grains were found in the base metal(BM) and heat-affected zone of Alloy 617, together with the twins with different widths located in the interior of the large grains. The columnar and equiaxed grain zones appear alternately due to the multilayer and multi-pass welding technique. In particular, compared with Alloy 617-BM, coarsened and even lamellar carbides were observed in Alloy 617-HAZ. These special carbides can separate the grains and therefore result in the formation of intergranular fracture morphology in Alloy 617-HAZ. Besides, the microhardness distribution was tested with a proper load, and the results exhibited that the weld possessed the highest hardness for all specimens with various aging time. The higher microhardness in Alloy 617-HAZ compared with that in Alloy 617-BM was attributed to the high density of the dislocations, which could be detected by transmission electron microscope. As a result, the coarsened carbides aggregated in the grain boundaries to form the lamellar layer are deemed as the main factor to reduce the impact toughness in Alloy 617-HAZ.
机译：系统研究了微观结构与冲击韧性的关系，特别是层状碳化物的形成及其对合金617（合金617-HAZ）的热影响区域的影响韧性的影响。在620℃下对不同时间的合金617/9％CR不同时间进行影响试验。结果表明，整个焊接接头的特征区显示出随着老化时间的增加而降低的冲击韧性。焊接金属中的冲击能量表现出高稳定性，尽管老化过程，但所有测试标本的合金617-HAZ呈现了各种老化时间的最低冲击韧性。同时，在基础金属（BM）和合金617的热影响区域中发现混合晶粒，与具有位于大颗粒内部的不同宽度的双胞胎一起。由于多层和多遍焊接技术，柱状和等轴晶粒区出现。特别地，与合金617-BM相比，在合金617-HAZ中观察到粗化甚至层状碳化物。这些特殊的碳化物可以分离晶粒，因此导致合金617-HAZ中的晶间骨折形态形成。此外，用适当的载荷测试显微硬度分布，结果表明，焊缝具有各种试样的所有标本具有最高的硬度。合金617-HAZ中的较高的微硬度与合金617-BM相比归因于脱位的高密度，其可以通过透射电子显微镜检测。结果，在晶界中聚集的粗碳化物以形成层状层的主要因素是降低合金617-HAZ中的冲击韧性的主要因素。

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