T91 钢在 550 °C 铅铋共晶液中的疲劳行为与应变速率有关

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Corrosion Science Pub Date : 2024-09-05 DOI:10.1016/j.corsci.2024.112433

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引用次数: 0

摘要

研究了 T91 钢在氧气饱和液态铅铋共晶（LBE）中 550 °C 不同应变速率下的低循环疲劳行为。T91 钢的疲劳寿命随着应变率从 0.4 % 到 0.004 %/s 的降低而减少了约 85%。通过先进的表征方法对裂纹尖端进行了仔细分析。在较低应变速率下，T91 钢的晶间抗氧化性降低，导致疲劳失效模式从准劈裂转变为劈裂开裂。值得注意的是，裂纹（>200 μm）沿再结晶晶界扩展，存在铅/铋偏析，但在 0.004 %/s 时未检测到氧化物。

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Strain-rate dependent fatigue behavior of T91 steel at 550 °C of liquid lead-bismuth eutectic

Low cycle fatigue behavior of T91 steel was investigated in oxygen saturated liquid lead-bismuth eutectic (LBE) at 550 °C with different strain rates. The fatigue life of T91 steel decreases by about 85 % with decreasing strain rate from 0.4 % to 0.004 %/s. The crack tip was carefully analyzed by advanced characterization. The intergranular oxidation resistance of T91 steel decreases at lower strain rates, leading to fatigue failure mode changes from quasi-cleavage to cleavage cracking. Notably, the cracks (>200 μm) propagate along the recrystallization grain boundaries with Pb/Bi segregation but without oxides detected at 0.004 %/s.

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.