Effects of high-vacuum arc melting-controlled oxygen content on inclusions and mechanical properties of steels with different refining processes and deoxidizers

IF 3.9 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Vacuum Pub Date : 2025-08-27 DOI:10.1016/j.vacuum.2025.114697

Wan-Yi Lin , Jyun-Hua Chang , Chun-Hway Hsueh

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Abstract

In this study, high-vacuum arc melting (VAM) was utilized to remelt and modify the oxygen content in steels with different refining processes and deoxidizers to investigate its effects on inclusions and mechanical properties. Specifically, the oxygen content was controlled at lower (<20 ppm) and higher (>80 ppm) than those in as-received steels (20–40 ppm). The phase and microstructure were examined and Thermo-Calc was used to simulate possible phases. The tensile/fatigue properties and hardness were measured. The results showed that carbides were refined after remelting in VAM and the tensile strength and hardness were enhanced. There was no big difference in tensile strength and hardness of steels with different oxygen contents. However, larger-sized carbides in steels without remelting in VAM resulted in poorer fatigue life. Compared to as-received steels, the non-metallic inclusion density was slightly reduced and acutely raised, respectively, after remelting in VAM with low and high oxygen contents. However, the fatigue properties depended on not only the oxygen content and inclusion densities but also inclusion types resulting from different deoxidizers. As Al₂O₃ inclusion density increased in Al-deoxidized steels, the fatigue life was reduced. However, the fatigue life was insensitive to SiO₂ inclusion density in Si/Mn-deoxidized steels.

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高真空电弧熔炼控制氧含量对不同精炼工艺和脱氧剂钢夹杂物和力学性能的影响

本文采用高真空电弧熔炼（VAM）技术，采用不同的精炼工艺和脱氧剂对钢中的氧含量进行重熔和改性，研究其对夹杂物和力学性能的影响。具体来说，氧含量被控制在较低（20 ppm）和较高（80 ppm），而不是在接收钢中（20 - 40 ppm）。采用热钙法模拟可能存在的相。测试了材料的拉伸/疲劳性能和硬度。结果表明：在VAM中重熔后碳化物得到细化，抗拉强度和硬度得到提高；不同氧含量钢的抗拉强度和硬度差异不大。然而，在VAM中未重熔的钢中存在较大的碳化物，导致疲劳寿命变差。与原位钢相比，在低氧和高氧VAM中重熔后，非金属夹杂物密度分别略有降低和急剧升高。而疲劳性能不仅与氧含量和夹杂物密度有关，还与不同脱氧剂产生的夹杂物类型有关。随着铝脱氧钢中Al2O3夹杂物密度的增加，疲劳寿命降低。而Si/ mn脱氧钢的疲劳寿命对SiO2夹杂物密度不敏感。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Vacuum 工程技术-材料科学：综合

CiteScore

6.80

自引率

17.50%

发文量

审稿时长

34 days

期刊介绍： Vacuum is an international rapid publications journal with a focus on short communication. All papers are peer-reviewed, with the review process for short communication geared towards very fast turnaround times. The journal also published full research papers, thematic issues and selected papers from leading conferences. A report in Vacuum should represent a major advance in an area that involves a controlled environment at pressures of one atmosphere or below. The scope of the journal includes: 1. Vacuum; original developments in vacuum pumping and instrumentation, vacuum measurement, vacuum gas dynamics, gas-surface interactions, surface treatment for UHV applications and low outgassing, vacuum melting, sintering, and vacuum metrology. Technology and solutions for large-scale facilities (e.g., particle accelerators and fusion devices). New instrumentation ( e.g., detectors and electron microscopes). 2. Plasma science; advances in PVD, CVD, plasma-assisted CVD, ion sources, deposition processes and analysis. 3. Surface science; surface engineering, surface chemistry, surface analysis, crystal growth, ion-surface interactions and etching, nanometer-scale processing, surface modification. 4. Materials science; novel functional or structural materials. Metals, ceramics, and polymers. Experiments, simulations, and modelling for understanding structure-property relationships. Thin films and coatings. Nanostructures and ion implantation.