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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 >Investigation on the tensile deformation mechanisms in a new Ni-Fe-base superalloy HT700T at 750 degrees C
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Investigation on the tensile deformation mechanisms in a new Ni-Fe-base superalloy HT700T at 750 degrees C

机译：750摄氏度新型Ni-Fe-Base高温合金HT700T中拉伸变形机制的研究

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摘要

After a standard heat treatment and subsequent isothermal aging at 750 degrees C for 8,220 h, the tensile deformation behavior of a novel precipitation-hardened Ni-Fe-base superalloy HT700T containing around 23 vol% of gamma' precipitates is studied at 750 degrees C. It is found that the work-hardening rate decreases monotonously with plastic strain. Transmission electron microscopy observations on the specimens stretched to various magnitudes of plastic strain reveal that Orowan looping prevails at the very beginning of plastic deformation. Whereas, as plastic deformation proceeds, more and more isolated superlattice stacking faults are produced within the gamma' precipitates although numerous dislocation loops have surrounded the same gamma' precipitates, suggesting shearing of gamma' precipitates by {111} '112' slip systems plays a more and more important role in the plastic deformation with strain. Based on the experimental observations, the relationship between the operative deformation mechanisms and the work-hardening rate of HT700T is discussed. (C) 2020 Elsevier B.V. All rights reserved.
机译：在750℃下的标准热处理和随后的等温老化后，在750℃下研究了含有约23体积γ沉淀物的新型沉淀硬化的Ni-Fe碱基超合金HT700T的拉伸变形行为。发现工作 - 硬化率随着塑性菌株单调而降低。透射电子显微镜观察标本伸展到各种塑性应变株的各种幅度揭示了塑性变形的开始时orowan环路普遍存在。然而，作为塑料变形所得，越来越多的超晶格堆叠故障在γ'沉淀物中产生虽然许多位错环包围相同的γ'沉淀物，但是通过{111}'的112'滑动系统造成γ'沉淀物的剪切在塑性变形中越来越重要的作用。基于实验观察，讨论了操作变形机制与HT700T的工作硬化率之间的关系。 （c）2020 Elsevier B.v.保留所有权利。

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