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首页> 外文期刊>Journal of Materials Engineering and Performance >Effects of Strain Rate on Tensile Deformation and Fracture Behavior of Directionally Solidified Superalloy DZ125L
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Effects of Strain Rate on Tensile Deformation and Fracture Behavior of Directionally Solidified Superalloy DZ125L

机译：应变率对定向凝固超合金DZ125L的拉伸变形和断裂行为的影响

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摘要

The tensile deformation and fracture behavior of directionally solidified superalloy DZ125L were studied with a strain rate ranging from 10(-3) to 7 x 10(2) s(-1) at room temperature. Results show that the strength of DZ125L alloy presents positive strain rate sensitivity in tested strain rate range which is mainly resulted from the increasing accumulation of dislocations in the matrix. The ductility of the alloy first increases and then it remains insensitive with the increase in strain rates. The enhancement of ductility is primarily due to the increasing amount of broken MC carbides and plastic deformation in the matrix at higher strain rates. The strain rates influence the amount of broken MC carbides and then affect the deformation behavior of the alloy. Based on observations and discussions of the lateral microstructures and dislocations, it is concluded that the MC carbides with sizes larger than 10 mu m are easy broken in the early deformation stage and act as crack sources during the proceeding plastic deformation. The growth and connection of microcracks and the propagation of main crack lead to the fracture of the matrix.
机译：通过在室温下的应变速率测量到定向凝固的超合金DZ125L的拉伸变形和断裂行为。结果表明，DZ125L合金的强度在测试的应变速率范围内提出阳性应变率灵敏度，主要是由于基质中的脱位累积的增加而导致。合金的延展性首先增加，然后随着应变率的增加仍然不敏感。延展性的增强主要是由于在较高的应变率下较高的MC碳化物和基质中的塑性变形的增加。应变率影响破碎的MC碳化物的量，然后影响合金的变形行为。基于外侧微观结构和脱位的观察和讨论，得出结论：具有大于10μm的尺寸的MC碳化物在早期变形阶段容易被破坏，并且在进行塑性变形期间充当裂缝源。微裂纹的生长和连接和主裂纹的繁殖导致基质的骨折。

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