Effects of aluminium addition and austempering temperatures on Al-alloyed ductile iron microstructure and mechanical properties

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2022-12-13 DOI:10.36547/ams.28.4.1598

A. Adebayo, O. Ajibola, O. Falodun, Sunday G. Borisade, A. Owa, Oluwole D Adigun, A. Oyetunji, K. Alaneme

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Abstract

The research investigates the effect of varying amounts of aluminium (1.05, 1.575, 2.29, 3.02 and 3.74 wt.%) addition and heat treatment (austempering at 300, 350, 400 oC) on the microstructure and mechanical properties of ductile cast iron alloys. The graphitizing effects of the Al alloy and varied austempering temperatures on hardness, tensile strength, and impact toughness of the ductile cast iron (DCI) were evaluated. The results of the influences of Al addition and heat treatment on the properties of the DCI determined were presented as graphical data while the microstructures were done by using a scanning electron microscope (SEM). The microstructures revealed that the addition of Al into the matrix brings about the precipitation of ferrite around the graphite nodules. The combined effects of the increase Al content and austempering temperatures produced greater hardness values on the Al-alloyed DCI samples than the as-cast sample. The hardness value for the entire sample ranged between 27.25 to 57.03 BHN. Tensile strength increased with an increase in Al content and lower austempering temperatures, whereas, the impact toughness increased with an increase in Al content and higher austempering temperature.

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铝添加和等温淬火温度对铝合金球墨铸铁组织和力学性能的影响

研究了不同量的铝(1.05、1.575、2.29、3.02和3.74 wt.%)添加量和热处理(300、350、400℃等温回火)对球墨铸铁合金组织和力学性能的影响。研究了不同等温淬火温度对球墨铸铁(DCI)硬度、抗拉强度和冲击韧性的影响。结果表明，Al添加和热处理对DCI性能的影响以图形形式呈现，并通过扫描电子显微镜(SEM)对其进行了显微组织分析。显微组织分析表明，Al的加入使石墨结核周围有铁素体析出。Al含量的增加和等温回火温度的共同作用使Al- DCI试样的硬度值高于铸态试样。整个试样的硬度值在27.25 ~ 57.03 BHN之间。拉伸强度随Al含量的增加和等温温度的降低而增加，冲击韧性随Al含量的增加和等温温度的升高而增加。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.