Effect of laser surface treatment on microstructural evolution and mechanical properties of a Co–Cr–Fe–Ni–Mo medium–entropy alloy

IF 6.1 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Science and Engineering: A Pub Date : 2024-11-30 DOI:10.1016/j.msea.2024.147617
Chan Woo Jung , Jae Hyuk Lee , Soo-Hyun Joo , Rae Eon Kim , Hyoung Seop Kim , Jongun Moon
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Abstract

In this study, we explored the influence of laser surface treatment on the microstructural evolution and mechanical properties of a Co17.5Cr12.5Fe55Ni10Mo5 medium-entropy alloy. After laser scanning on the cold-rolled alloy, a heterogeneous microstructure with Mo-rich μ-precipitates formed along the depth from the surface. Notably, laser processing parameters, including scanning speed and the number of scans, affected the macroscopic heterogeneity in the microstructure of the alloy, such as the thickness of the columnar, recrystallized, partially-recrystallized, and non-recrystallized layers. Furthermore, the microstructural features of the laser-treated alloys with a heterogeneous distribution of grains, cellular structures, and precipitates, contributed to the mechanical response of the alloys. As the heat input from the laser heat source increases, the grain coarsening and the absence of non-recrystallized layer have a greater impact on the strength of the laser-treated alloys, even if the precipitates distributed deeper from the surface. These microstructural modifications through laser surface treatment are linked to variations in the mechanical performance of the alloys, indicating that it can be an effective method to tailor the mechanical properties of structural materials.
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激光表面处理对Co-Cr-Fe-Ni-Mo中熵合金组织演变和力学性能的影响
本研究探讨了激光表面处理对Co17.5Cr12.5Fe55Ni10Mo5中熵合金显微组织演变和力学性能的影响。冷轧合金经激光扫描后,从表面开始沿深度形成了富mo μ-析出相的非均匀组织。值得注意的是,激光加工参数,包括扫描速度和扫描次数,影响合金微观组织的宏观非均匀性,如柱状层、再结晶层、部分再结晶层和非再结晶层的厚度。此外,激光处理合金的微观组织特征是晶粒、胞状组织和析出相的非均匀分布,这对合金的力学响应有影响。随着激光热源输入热量的增加,晶粒粗化和非再结晶层的缺失对激光处理合金强度的影响更大,即使析出相分布在离表面较深的地方。这些通过激光表面处理的微观结构改变与合金机械性能的变化有关,表明它可以是一种有效的方法来定制结构材料的机械性能。
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来源期刊
Materials Science and Engineering: A
Materials Science and Engineering: A 工程技术-材料科学:综合
CiteScore
11.50
自引率
15.60%
发文量
1811
审稿时长
31 days
期刊介绍: Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.
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