近液相线法制备A390合金显微组织的演变

周运海; 程和法; 陈文珂; 黄韦

doi:10.15980/j.tzzz.2013.01.026

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近液相线法制备A390合金显微组织的演变
Evolution of Microstructure of A390 Alloy during Near-Liquids Semi-Solid Casting
2013年33卷第1期页码：21-24
纸质出版日期： 2013 ，
DOI： 10.15980/j.tzzz.2013.01.026

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[1]周运海,程和法,陈文珂,黄韦.近液相线法制备A390合金显微组织的演变[J].特种铸造及有色合金,2013,33(01):21-24.

Zhou Yunhai, Cheng Hefa, Chen Wenke, et al. Evolution of Microstructure of A390 Alloy during Near-Liquids Semi-Solid Casting[J]. Special Casting & Nonferrous Alloys, 2013,33(1):21-24.
[1]周运海,程和法,陈文珂,黄韦.近液相线法制备A390合金显微组织的演变[J].特种铸造及有色合金,2013,33(01):21-24. DOI： 10.15980/j.tzzz.2013.01.026.

Zhou Yunhai, Cheng Hefa, Chen Wenke, et al. Evolution of Microstructure of A390 Alloy during Near-Liquids Semi-Solid Casting[J]. Special Casting & Nonferrous Alloys, 2013,33(1):21-24. DOI： 10.15980/j.tzzz.2013.01.026.

摘要

采用近液相线法制备半固态A390合金

研究了A390合金在液相线温度附近保温时

其凝固组织形态随保温温度和时间的演变规律。结果表明

当保温温度从695℃逐渐降至650℃左右时

A390合金的凝固组织中α-Al相由树枝晶状逐渐演变成蔷薇状晶和近似球状的形态

初生Si相也不断细化且形态趋于圆整;在635～650℃之间保温40～55min时

能够使A390合金获得细小、均匀的颗粒状初生Si相和较为圆整的α-Al相微观组织。随着冷却速度的提高

保温处理后A390合金凝固组织的初生Si更加细小

α-Al相更加圆整。

Abstract

Semi-solid A390 alloy was prepared by near-liquidus process. The microstructure evolution of A390 alloy with varied holding temperature and time was observed with the alloy melt held around the liquidus temperature. The results show that with the holding temperature decreased from 695℃ to 650 ℃

the α -Al phase in the microstructure of the alloy is transformed gradually from dendrite to rosette and then into spherical shape

and the primary Si is converted into refined particle. The uniform refined primary Si particle and nearly spherical α -Al can be obtained in the microstructure of A390 alloy with holding at 635

50 ℃ for 40

5 min. It is found that with increasing in cooling rate

the primary Si and α phase in the microstructure of the alloy become more refine and spherical

respectively.