Effects of Boron Addition on the Microstructure and Mechanical Properties of γ′-Strengthened Directionally Solidified CoNi-Base Superalloy

IF 2.9 2区 材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Acta Metallurgica Sinica-English Letters Pub Date : 2024-06-13 DOI:10.1007/s40195-024-01715-y
Shasha Qu, Yingju Li, Bingyu Lu, Cuiping Wang, Yuansheng Yang
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Abstract

The effects of B addition on microstructure and mechanical properties of a γ′-strengthened CoNi-base superalloy are investigated. The addition of B leads to a substantial increase in the volume fraction of both the eutectic structure and borides. The CoNi-base alloy shows a high solubility limit for the element B. Borides become noticeable in the area surrounding the eutectic structure after the B level exceeds 0.46 at.%. It is found that the compression property and stress rupture life of the 4W2Ta alloys exhibit an initial rise followed by a subsequent drop as the B content gradually increases from 0.08 to 0.78 at.%. The 4W2Ta0.46B alloy demonstrates the most excellent high-temperature strength and stress rupture life, revealing that a moderate amount of B in the alloy noticeably enhances its mechanical properties by enhancing the grain boundary cohesion.

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加硼对γ′-强化定向凝固 CoNi-Base 超合金微观结构和力学性能的影响
研究了添加硼对γ′强化钴镍基超级合金的微观结构和机械性能的影响。硼的添加导致共晶结构和硼化物的体积分数大幅增加。当硼元素含量超过 0.46 at.% 时,共晶结构周围区域的硼化物变得明显。研究发现,随着 B 含量从 0.08%逐渐增加到 0.78%,4W2Ta 合金的压缩性能和应力断裂寿命会出现先上升后下降的现象。4W2Ta0.46B 合金表现出最优异的高温强度和应力断裂寿命,这表明合金中适量的 B 可以增强晶界内聚力,从而显著提高其机械性能。
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来源期刊
Acta Metallurgica Sinica-English Letters
Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-
CiteScore
6.60
自引率
14.30%
发文量
122
审稿时长
2 months
期刊介绍: This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.
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