Effects of Improvement of Grain Refinement on Segregation in the ZL205A Alloy

Zheng Weidong; Ruan Lei; Li Shasha; Luo Chuanbiao; Du Xuchu; Huang Li

doi:10.15980/j.tzzz.2017.07.028

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Effects of Improvement of Grain Refinement on Segregation in the ZL205A Alloy
Vol. 37, Issue 7, Pages: 792-795(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.07.028

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[1]郑卫东,阮磊,厉沙沙,罗传彪,杜旭初,黄粒.晶粒细化工艺对ZL205A合金偏析缺陷的影响[J].特种铸造及有色合金,2017,37(07):792-795.

Zheng Weidong, Ruan Lei, Li Shasha, et al. Effects of Improvement of Grain Refinement on Segregation in the ZL205A Alloy. [J]. Special Casting & Nonferrous Alloys 37(7):792-795(2017)
[1]郑卫东,阮磊,厉沙沙,罗传彪,杜旭初,黄粒.晶粒细化工艺对ZL205A合金偏析缺陷的影响[J].特种铸造及有色合金,2017,37(07):792-795. DOI： 10.15980/j.tzzz.2017.07.028.

Zheng Weidong, Ruan Lei, Li Shasha, et al. Effects of Improvement of Grain Refinement on Segregation in the ZL205A Alloy. [J]. Special Casting & Nonferrous Alloys 37(7):792-795(2017) DOI： 10.15980/j.tzzz.2017.07.028.

摘要

采用金相显微镜（OM）和ProCAST软件

研究了晶粒细化工艺对ZL205A合金偏析缺陷的影响。结果表明

通过优化Al-5Ti-B中间合金添加工艺（两步添加）

可增强合金的晶粒细化效果

提高其流动性、力学性能、抗热裂能力以及铸造性能;在凝固末期

ZL205A合金会形成晶间搭桥

加强了晶间结合力

而晶粒细化有利于增大晶粒之间的接触面积

扩大晶间搭桥面积

有效提升晶间的结合力

使合金热裂倾向降低

因此减少ZL205A合金的偏析缺陷。

Abstract

By using OM and ProCAST software

effects of grain refinement technology on the segregation in ZL205 Aalloys were investigated.The results show that microstructure of the ZL205 Acan be refined significantly after the multistep addition of Al-5Ti-B alloy.The mechanical properties

casting properties

flow ability and thermal cracking performance of the ZL205 Aalloy can be improved effectively.The grain bridge can be formed in the ending process of the solidification

which enhances the bonding force among the grain boundary.The grain refinement can increase significantly the contact area among the grain boundaries.Therefore

the bonding force of the grain boundaries is improved obviously with the relative slow intergranular separation process

which decreases the hot tearing tendency and the segregation in the ZL205 Aalloys.