Directionally solidified structure of peritectic steel

IF 1.7 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Ironmaking & Steelmaking Pub Date : 2023-04-16 DOI:10.1080/03019233.2023.2194736

Zhenqiang Deng, Yaqiang Li, Pengcheng Sheng, Lu-kuo Hong, Nan Zhang, Mengfan Li

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引用次数: 0

Abstract

ABSTRACT The solidification structure of peritectic steels (15CrMo and 20CrMo) was studied using directional solidification experiments. An island dendrite structure was observed in the hypoperitectic steel (15CrMo) at growth velocities of 15, 50, and 80 μm·s−1. While a traditional peritectic dendritic structure was observed in the hyperperitectic steel (20CrMo) at growth velocities of 15 and 50 μm·s−1, an island dendrite structure was observed at a growth velocity of 80 μm·s−1. An analysis of the solute distributions near the liquid-solid interface during solidification revealed the role of the steel grade and cooling velocity on the formation of island dendrite structures. Higher cooling velocities caused higher carbon concentration gradients in the liquid phase near the liquid-solid interface, leading to a stronger driving force for the peritectic reaction and, consequently, a more favourable formation of island dendrite structures. Hypoperitectic steel is more prone to the formation of island dendrite structures than hyperperitectic steel.

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包晶钢的定向凝固组织

采用定向凝固实验研究了包晶钢（15CrMo和20CrMo）的凝固组织。在15、50和80的生长速度下，在亚共晶钢（15CrMo）中观察到岛状枝晶结构 μm·s−1。而在15和50的生长速度下，在超共晶钢（20CrMo）中观察到传统的包晶树枝状结构 μm·s−1时，在80的生长速度下观察到岛状枝晶结构 μm·s−1。对凝固过程中液固界面附近溶质分布的分析揭示了钢种和冷却速度对岛状枝晶组织形成的作用。更高的冷却速度导致液-固界面附近液相中的碳浓度梯度更高，导致包晶反应的驱动力更强，从而更有利地形成岛状枝晶结构。次包晶钢比过包晶钢更容易形成岛状枝晶结构。

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来源期刊

Ironmaking & Steelmaking 工程技术-冶金工程

CiteScore

3.70

自引率

9.50%

发文量

125

审稿时长

2.9 months

期刊介绍： Ironmaking & Steelmaking: Processes, Products and Applications monitors international technological advances in the industry with a strong element of engineering and product related material. First class refereed papers from the international iron and steel community cover all stages of the process, from ironmaking and its attendant technologies, through casting and steelmaking, to rolling, forming and delivery of the product, including monitoring, quality assurance and environmental issues. The journal also carries research profiles, features on technological and industry developments and expert reviews on major conferences.