Fusion defects-induced enhancement of fatigue life at elevated temperature of CoCrFeNiMo0.5 alloy produced by laser-powder bed fusion

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-09-16 DOI:10.1016/j.jmrt.2025.09.134

Shuai Tong , Junming Xiong , Zhichao Ma , Chaofan Li , Jiakai Li , Hongwei Zhao , Luquan Ren , Chuliang Yan

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Abstract

The inherent porosity in additive manufacturing is typically classified as fusion-related defects, and the low cycle fatigue (LCF) life of most metallic materials diminishes with increasing temperature. Notably, the CoCrFeNiMo_0.5 alloy containing fusion defects exhibited an anomalously enhanced LCF life at elevated temperatures compared to ambient conditions. Utilizing a custom-designed mechanical-thermal coupling fatigue testing apparatus, we conducted LCF assessments of the CoCrFeNiMo_0.5 alloy across a temperature spectrum from 20 °C to 600 °C. Specimens fabricated with three different laser power settings demonstrated increased fatigue life at 200 °C, with the specimen processed at 165 W laser power showing a 65.6 % improvement in LCF life at 200 °C relative to room temperature. Microstructural analysis across multiple scales revealed that porosity acts as a stress dissipation mechanism, mitigating localized stress concentrations, thereby retarding crack initiation and propagation, and ultimately extending fatigue life.

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激光粉末床熔合CoCrFeNiMo0.5合金的高温疲劳寿命

增材制造中固有的多孔性通常被归类为与融合有关的缺陷，并且大多数金属材料的低周疲劳寿命随着温度的升高而降低。值得注意的是，与环境条件相比，含有熔合缺陷的CoCrFeNiMo0.5合金在高温下的LCF寿命异常延长。利用定制的机械-热耦合疲劳测试设备，我们在20°C至600°C的温度范围内对CoCrFeNiMo0.5合金进行了LCF评估。用三种不同的激光功率设置制作的试样在200°C下的疲劳寿命增加，在165 W激光功率下处理的试样在200°C下的LCF寿命相对于室温提高了65.6%。多尺度的微观结构分析表明，孔隙度作为应力消散机制，减轻了局部应力集中，从而延缓了裂纹的萌生和扩展，最终延长了疲劳寿命。

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来源期刊

Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys

CiteScore

8.80

自引率

9.40%

发文量

1877

审稿时长

35 days

期刊介绍： The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.