Impact of Permanent Magnet Stirring on Inclusion Evolution, Solidification Structure and Mechanical Properties of AH32 Shipbuilding Steel

IF 1.9 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

steel research international Pub Date : 2024-07-31 DOI:10.1002/srin.202400154

Xiangwei Liao, Ji Yang, Duo Wu, Chunlin Peng, Xiaolei Zhu, Jianfei Peng, Jie Zeng

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Abstract

An experimental investigation has been conducted with respect to the effect of permanent magnet stirring (PMS) under different rotation speeds (0, 60, 180 rpm) on the solidification of AH32 shipbuilding steel by analyzing the inclusion evolution, solidification structure, and mechanical properties. As the rotation speed increased from 0 to 180 rpm, the mean size of inclusions (Al2O3, MnS, and Al2O3–MnS) reduced significantly from 6.23 to 2.92 μm, their number increased from 49 to 82 n mm−2 and the ratio of complex inclusions increased from 30.6% to 75.6% in the AH32 steel ingot. Besides, the increasing number of small complex inclusion promotes the formation of acicular ferrite in steel, resulting in an elevation of the area ratio from 10.5% to 27.8%. Furthermore, under a rotation speed of 180 rpm, the mean grain size decreased to 99.4 μm and the frequency of high‐angle grain boundaries (HAGBs) increased to 86.1%. In addition, the as‐cast AH32 steel exhibited an optimized ultimate tensile strength of 532.0 MPa and an improved elongation of 24.2% after an enhanced PMS, which was attributed to more acicular ferrite, higher HAGBs ratio, and refined grain size.

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永磁搅拌对 AH32 造船钢的夹杂物演化、凝固结构和力学性能的影响

通过分析夹杂物的演变、凝固结构和机械性能，对不同转速（0、60、180 rpm）下永磁搅拌（PMS）对 AH32 造船钢凝固的影响进行了实验研究。随着转速从 0 rpm 增加到 180 rpm，AH32 钢锭中夹杂物（Al2O3、MnS 和 Al2O3-MnS）的平均粒度从 6.23 μm 显著减小到 2.92 μm，数量从 49 n mm-2 增加到 82 n mm-2，复杂夹杂物的比例从 30.6% 增加到 75.6%。此外，小复合夹杂物数量的增加促进了钢中针状铁素体的形成，使面积比从 10.5% 提高到 27.8%。此外，在 180 转/分的转速下，平均晶粒尺寸减小到 99.4 μm，高角度晶界（HAGBs）频率增加到 86.1%。此外，在增强 PMS 之后，铸态 AH32 钢的极限抗拉强度达到 532.0 MPa，伸长率提高了 24.2%，这归功于更多的针状铁素体、更高的 HAGBs 比率和细化的晶粒尺寸。

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来源期刊

steel research international 工程技术-冶金工程

CiteScore

3.30

自引率

18.20%

发文量

319

审稿时长

1.9 months

期刊介绍： steel research international is a journal providing a forum for the publication of high-quality manuscripts in areas ranging from process metallurgy and metal forming to materials engineering as well as process control and testing. The emphasis is on steel and on materials involved in steelmaking and the processing of steel, such as refractories and slags. steel research international welcomes manuscripts describing basic scientific research as well as industrial research. The journal received a further increased, record-high Impact Factor of 1.522 (2018 Journal Impact Factor, Journal Citation Reports (Clarivate Analytics, 2019)). The journal was formerly well known as "Archiv für das Eisenhüttenwesen" and "steel research"; with effect from January 1, 2006, the former "Scandinavian Journal of Metallurgy" merged with Steel Research International. Hot Topics: -Steels for Automotive Applications -High-strength Steels -Sustainable steelmaking -Interstitially Alloyed Steels -Electromagnetic Processing of Metals -High Speed Forming