Effects of cooling rate on microstructure and microhardness of directionally solidified Galvalume alloy

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国家科技期刊平台
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外文摘要：The influences of cooling rate on the phase constitution,microstructural length scale,and microhardness of directionally solidified Galvalume(Zn-55Al-1.6Si)alloy were investigated by directional solidification experiments at different withdrawal speeds(5,10,20,50,100,200,and 400 μm·s-1).The results show that the microstructure of directionally solidified Galvalume alloys is composed of primary Al dendrites,Si-rich phase and(Zn-Al-Si)ternary eutectics at the withdrawal speed ranging from 5 to 400 μm·s-1.As the withdrawal speed increases,the segregation of Si element intensifies,resulting in an increase in the area fraction of the Si-rich phase.In addition,the primary Al dendrites show significant refinement with an increase in the withdrawal speed.The relationship between the primary dendrite arm spacing(λ1)and the thermal parameters of solidification is obtained:λ1=127.3V-031.Moreover,as the withdrawal speed increases from 5 to 400 μm·s-1,the microhardness of the alloy increases from 90 HV to 151 HV.This is a combined effect of grain refinement and second-phase strengthening.

外文关键词：

Galvalume alloydirectional solidificationmicrostructure length scalemicrohardness

作者：

Ji-peng Li、De-gao Qiao、Jian Li、Xiao-yang Luo、Peng Peng、Xian-tao Yan、Xu-dong Zhang

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作者单位：

Gansu Jiu Steel Group Hongxing Iron and Steel Co.,Ltd.,Jiayuguan 735111,Gansu,China

School of Materials and Energy,Lanzhou University,Lanzhou 730000,China

基金：

Key Science and Technology Projects of Gansu ProvinceGansu Key Research and Development ProjectGansu Provincial Joint Research Fund中央高校基本科研业务费专项State Key Laboratory of Solidification Processing in NPU

项目编号：

22ZD6GB01923YFGA000323JRRC0004lzujbky-2022-ey15SKLSP202204

出版年：

2024

DOI：

10.1007/s41230-024-3093-y

中国铸造

沈阳铸造研究所

中国铸造

CSTPCDEI

影响因子：0.299

ISSN：1672-6421

年,卷(期)：2024.21(3)

参考文献量33