Effect of Elevated Temperature on Low Cycle Fatigue and Tensile Strength of 12Cr Ferritic Steel

IF 4 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Metals and Materials International Pub Date : 2024-12-02 DOI:10.1007/s12540-024-01858-8

Un Bong Baek, Jaeyeong Park, Thanh Tuan Nguyen

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Abstract

This research investigates the low cycle fatigue (LCF) and tensile properties of X20CrMoV12.1 steel which belongs to the group 12Cr ferritic steels at 538–566 °C. The tensile strength measured at elevated temperature exhibits a reduction of approximately 30% compared to values obtained at ambient conditions. Conversely, ductility properties show a significant increase under elevated temperatures. Fatigue strength at elevated temperatures is generally lower than at ambient conditions for similar strain amplitudes, with a pronounced reduction observed at low strain amplitudes. Fractographic analysis indicates that the observed reduction in fatigue strength at low strains is due to oxidation-induced microcrack initiations following prolonged exposure to high temperatures. The Basquin-Coffin-Masson models and Ramberg–Osgood models were utilized to characterize the LCF properties of the materials for each temperature condition. The transition fatigue life of sample performed at ambient air is approximately half that of those tested at elevated temperatures. The findings demonstrate that the influence of chromium content on improving the LCF properties of X20CrMoV12.1 material is insignificant compared to materials with lower chromium content under the elevated temperature range of 538–566 °C.

Graphical Abstract

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高温对12Cr铁素体钢低周疲劳和抗拉强度的影响

研究了12Cr铁素体钢X20CrMoV12.1钢在538 ~ 566℃下的低周疲劳（LCF）和拉伸性能。与在环境条件下获得的值相比，在高温下测量的抗拉强度降低了约30%。相反，在高温下，延展性显著提高。对于相似的应变幅值，高温下的疲劳强度通常低于环境条件下的疲劳强度，在低应变幅值下观察到明显的降低。断口分析表明，在低应变下观察到的疲劳强度降低是由于长时间暴露于高温下氧化诱发的微裂纹引发的。利用Basquin-Coffin-Masson模型和Ramberg-Osgood模型表征了材料在不同温度条件下的LCF特性。常温下试样的过渡疲劳寿命大约是高温下试样的一半。结果表明：在538 ~ 566℃的高温范围内，与低铬材料相比，铬含量对X20CrMoV12.1材料LCF性能的改善影响不显著。图形抽象

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来源期刊

Metals and Materials International 工程技术-材料科学：综合

CiteScore

7.10

自引率

8.60%

发文量

197

审稿时长

3.7 months

期刊介绍： Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.