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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >In-situ observation of crack initiation and propagation in Ni-based superalloy with film cooling holes during tensile test
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In-situ observation of crack initiation and propagation in Ni-based superalloy with film cooling holes during tensile test

机译：基于Ni基超合金与薄膜冷却孔在拉伸试验期间的裂纹启动和繁殖的原位观察

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摘要

The main aim of this work is to explore and analyze the crack initiation and propagation in nickel-based superalloy with film cooling holes (FCHs) during the in-situ tensile test. The stress value and position of crack initiation were determined by experiments and finite element analysis (FEA). Internal cracking of the metallic carbides (MC) composed by refractory elements has a greater impact on crack initiation and propagation. Both crack initiation and early expansion are Mode-I. The secondary crack spread in the opening type; however, the main crack spread in the form of slip separation. The material microstructure in crack tip plastic zone has a decisive effect on the crack propagation path. Finally, samples break along the {111} slip plane and perpendicular to the stress axis direction in the form of cross-cleavage. (C) 2019 Elsevier B.V. All rights reserved.
机译：这项工作的主要目的是在原位拉伸试验期间探索和分析镍基超合金中的镍高超合金中的裂纹启动和传播。 通过实验和有限元分析（FEA）测定裂纹引发的应力值和位置。 由耐火元件组成的金属碳化物（MC）的内部开裂对裂纹引发和繁殖具有更大的影响。 裂缝启动和早期扩展都是模式-I。 开口型次级裂缝扩散; 然而，主要裂缝以滑移分离的形式传播。 裂纹尖端塑料区的材料微观结构对裂缝繁殖路径具有决定性作用。 最后，样品沿{111}滑移平面断裂，垂直于交叉切割的形式垂直于应力轴方向。 （c）2019 Elsevier B.v.保留所有权利。

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