The effect of oxide scale and microstructural changes during cyclic hot corrosion on high-temperature tensile properties of Rene-80 superalloy

IF 1 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials at High Temperatures Pub Date : 2023-11-01 DOI:10.1080/09603409.2023.2276995

ARMAN Rabieifar, M. REZA Afshar, HAMIDREZA Najafi

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Abstract

ABSTRACTThe effect of oxide scale and microstructural changes during 10, 20, and 40 hot corrosion cycles on the high-temperature tensile properties of Rene-80 superalloy at 950 °C was investigated. Due to the formation of micro-cracks and micro-voids, compressive stresses produced from Cr2O3 and NiO growth, and tensile stresses stemming from NiMoO4 transformation and Al internal oxidation, the oxide scale spalled. By increasing the hot corrosion cycles, UTS (Ultimate Tensile Strength) and El.% (Elongation) first decreased and then increased due to the propagation of intergranular vertical cracks from the oxide scale to the Rene-80 after 20 cycles. During hot corrosion cycles, YS increased due to a rise in the density of near-surface intergranular cracks close to the Rene-80/oxide scale interface resulting from micro-void linkage and γ′-depleted zone. Due to the high area fraction and the small average size of secondary γ′, UTS and YS were the highest and lowest after ten cycles, respectively.KEYWORDS: Rene-80 superalloyhot corrosionoxide scaletensile propertiesfracture surfaceγ' precipitate Disclosure statementNo potential conflict of interest was reported by the author(s).

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循环热腐蚀过程中氧化皮和显微组织变化对Rene-80高温合金高温拉伸性能的影响

摘要研究了热腐蚀循环10、20、40次时氧化皮和显微组织变化对Rene-80高温合金950℃高温拉伸性能的影响。由于微裂纹和微孔洞的形成、Cr2O3和NiO生长产生的压应力以及NiMoO4相变和Al内部氧化产生的拉应力，导致氧化皮剥落。通过增加热腐蚀循环，UTS(极限拉伸强度)和El。经过20次循环后，由于晶间垂直裂纹从氧化层向Rene-80扩展，伸长率先减小后增大。在热腐蚀循环中，由于微孔洞连接和γ′枯竭区导致靠近Rene-80/氧化物界面的近表面晶间裂纹密度增加，YS增加。由于二次γ′的面积分数高，平均尺寸小，10次循环后的UTS和YS分别最高和最低。关键词:稀土-80高温合金，热腐蚀，氧化垢，拉伸性能，断口γ′沉淀披露声明作者未报告潜在的利益冲突。

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来源期刊

Materials at High Temperatures 工程技术-材料科学：综合

CiteScore

1.90

自引率

15.40%

发文量

审稿时长

>12 weeks

期刊介绍： Materials at High Temperatures welcomes contributions relating to high temperature applications in the energy generation, aerospace, chemical and process industries. The effects of high temperatures and extreme environments on the corrosion and oxidation, fatigue, creep, strength and wear of metallic alloys, ceramics, intermetallics, and refractory and composite materials relative to these industries are covered. Papers on the modelling of behaviour and life prediction are also welcome, provided these are validated by experimental data and explicitly linked to actual or potential applications. Contributions addressing the needs of designers and engineers (e.g. standards and codes of practice) relative to the areas of interest of this journal also fall within the scope. The term ''high temperatures'' refers to the subsequent temperatures of application and not, for example, to those of processing itself. Materials at High Temperatures publishes regular thematic issues on topics of current interest. Proposals for issues are welcomed; please contact one of the Editors with details.