Room temperature tensile behaviour of K640S Co-based superalloy
Room temperature tensile behaviour of K640S Co-based superalloy
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DOI：
10.1080/02670836.2019.1572298
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发表时间：
2019-01
影响因子：
1.8
通讯作者：
Gui-chen Hou;Jun Xie;Jin-jiang Yu;Xiao-feng Sun;Yi-zhou Zhou
中科院分区：
文献类型：
--
作者：
Gui-chen Hou;Jun Xie;Jin-jiang Yu;Xiao-feng Sun;Yi-zhou Zhou
通过拉伸试验和显微组织观察，研究了K640S钴基高温合金的室温拉伸性能。实验结果表明，K640S合金的变形机制为位错滑移，位错可分解为不同取向的连续层错，随着位错数目的增加，位错缠结与分解的层错相互作用，提高了合金的抗拉强度。随着拉伸的进一步进行，不同晶间的多个滑移系统被激活以协调变形，并逐渐发生塑性变形。应力集中在碳化物界面，形成微裂纹，导致合金混晶断裂。
The room-temperature tensile properties of K640S cobalt-based superalloy were investigated by tensile tests and microstructure observation. The experimental results showed that the deformation mechanism of K640S alloy is dislocation slip; that the dislocation could be decomposed into continuous stacking faults with different orientations; and that with the increase of the number of dislocations, the dislocation tangle interacts with the decomposed stacking fault to increase the tensile strength of the alloy. As the stretching proceeded further, a plurality of slip systems were activated between different grains to coordinate the deformation, and the grains were gradually plastically deformed. The stress concentration occurred at the carbide interfaces, and microcracks were formed, causing mixed crystal fracture to the alloy.