复合变质对不同壁厚Al-20Si合金组织及磨损性能的影响

袁中人; 王连登; 张拓; 朱定一; 陈明; 林佳伟

doi:10.15980/j.tzzz.2019.08.025

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复合变质对不同壁厚Al-20Si合金组织及磨损性能的影响
Effects of Composite Modification on Microstructure and Wear Properties of Al-20Si Castings with Different Thickness
2019年39卷第8期页码：909-913
纸质出版日期： 2019 ，
DOI： 10.15980/j.tzzz.2019.08.025

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[1]袁中人,王连登,张拓,朱定一,陈明,林佳伟.复合变质对不同壁厚Al-20Si合金组织及磨损性能的影响[J].特种铸造及有色合金,2019,39(08):909-913.

Yuan Zhongren, Wang LiANDeng, Zhang Tuo, et al. Effects of Composite Modification on Microstructure and Wear Properties of Al-20Si Castings with Different Thickness[J]. Special Casting & Nonferrous Alloys, 2019,39(8):909-913.
[1]袁中人,王连登,张拓,朱定一,陈明,林佳伟.复合变质对不同壁厚Al-20Si合金组织及磨损性能的影响[J].特种铸造及有色合金,2019,39(08):909-913. DOI： 10.15980/j.tzzz.2019.08.025.

Yuan Zhongren, Wang LiANDeng, Zhang Tuo, et al. Effects of Composite Modification on Microstructure and Wear Properties of Al-20Si Castings with Different Thickness[J]. Special Casting & Nonferrous Alloys, 2019,39(8):909-913. DOI： 10.15980/j.tzzz.2019.08.025.

摘要

采用P和RE对Al-20Si合金进行复合变质

并用铜模冷却不同壁厚铸件进行试验

采用OM、SEM分析复合变质对Si相组织的影响

并对其磨损性能进行研究。结果表明

铜模的高蓄热系数与铸件壁厚的减小降低了合金的再辉温度

与复合变质共同作用

起到明显细化Si相作用

5mm厚铸件中初生Si平均晶粒尺寸仅为7.1μm。随着晶粒尺寸减小

硬度逐渐增大

磨损量变小。当铸件厚度逐渐减小时

合金由剥层磨损机制转变为磨粒磨损和粘着磨损的混合机制。

Abstract

Al-20Si alloy was modified treatment by P and RE compound addition

and the copper mold was used to cool castings with different thickness.The effects of composite modification on Si phase morphology and the wear behavior of the alloy parts were analyzed by OM and SEM.The results reveal that the recalescence temperature of the alloy is reduced due to the high heat storage coefficient of the copper mold and the decrease of the wall thickness of the casting

which is together with the composite modification to refine Si significantly.The average grain size of primary Si in the castings with 5 mm thickness is only 7.1μm.As the grain size decrease

its hardness is increased gradually and wear rate is decreased.With the decrease of castings thickness gradually

the wear mechanism of alloy is characterized by from stripping-wear to a mixed mechanism of abrasive wear and adhesive wear.