Effects of Isothermal Process on Semi-solid Recycled Microstructures of ZL205A Alloy Chips

Wang Mingjie; Yang Yong; Tian Weiwei; Zhang Xu; Wang Ye; Ji Zesheng

doi:10.15980/j.tzzz.2022.11.017

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Effects of Isothermal Process on Semi-solid Recycled Microstructures of ZL205A Alloy Chips
Vol. 42, Issue 11, Pages: 1396-1401(2022)
Published： 2022 ，
DOI： 10.15980/j.tzzz.2022.11.017

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Wang Mingjie, Yang Yong, Tian Weiwei, et al. Effects of Isothermal Process on Semi-solid Recycled Microstructures of ZL205A Alloy Chips. [J]. Special Casting & Nonferrous Alloys 42(11):1396-1401(2022)
DOI：

Wang Mingjie, Yang Yong, Tian Weiwei, et al. Effects of Isothermal Process on Semi-solid Recycled Microstructures of ZL205A Alloy Chips. [J]. Special Casting & Nonferrous Alloys 42(11):1396-1401(2022) DOI： 10.15980/j.tzzz.2022.11.017.

摘要

为了在ZL205A合金半固态再生坯料中获得细小的球状晶粒，采用应变诱导激活法(Strain-Induced Melt Activation)处理半固态再生ZL205A合金废屑，研究了等温处理工艺对半固态再生坯料组织的影响，并进行了试验验证。结果表明，随着等温温度升高和等温时间延长，半固态坯料的平均晶粒尺寸呈先增后减再增的趋势，晶粒的形状也由圆整变为不规则再到圆整。最佳等温处理工艺为620℃×45 min

该参数下获得的半固态晶粒的平均晶粒尺寸为114μm

形状因子为1.12

固相率低于68%。

Abstract

In order to obtain the fine globular grains in semi-solid recycled billets

Strain-Induced Melt Activation（SIMA） process was carried out for ZL205 A alloy chips. The effects of SIMA process on microstructure of semi-solid billets were investigated and verified.The results indicate that with the increase of isothermal temperature and isothermal time

the average grain size of semi-solid billet is firstly increased

then decreased and finally increased

while the grain shape is transformed from roundness to irregularity to roundness again. In conclusion

the optimal process parameters is 620 ℃×45 min

where the average grain size and shape factor of ZL205 A alloy semi-solid microstructure are 114 μm and 1.12

respectively

and the solid fraction is lower than 68%.