锻压技术

7A04合金半固态触变模锻的组织演化

英文标题：Microstructure evolution of 7A04 alloy in semi-solid state thixoforging

作者：田文彤杨辉

单位：常州工学院机电工程学院

关键词：7A04合金触变模锻组织演化

分类号：TG319

出版年,卷(期):页码：2008,33(5):85-87

摘要：

研究了SIMA法制备的7A04合金在半固态触变模锻工艺中的组织演化规律。结果表明:在半固态重熔加热过程中,随着加热温度的升高和保温时间的延长,晶粒逐渐球化和长大,且加热温度对重熔加热组织的影响比保温时间大;当将具有此特征的坯料进行半固态触变模锻后,其获得的触变模锻件的显微组织与半固态重熔组织密切相关。当模锻温度达到600℃以上时,模锻件的显微组织变化不大,仍是均匀的近球形的显微组织,而且模锻件各区域的合金成分基本一致。揭示了采用半固态触变模锻工艺可获得形状复杂的高质量制件。

The microstructure evolution of 7A04 alloy made by SIMA method in semi-sold thixoforging process was studied.The results show that the grains are grown up and sphericized with the temperature increase and isothermal holding time prolongation during reheating in semi-solid state.Moreover,the heating temperature has a large influence on the reheating microstructure than that of isothermal holding time.When the billets with the same reheating microstructure are thixoforged,it is found that the microstructure of thixoforging parts is closely related to the reheating microstructure.And when the thixoforging temperature is over 600 ℃,the microstructure of thixoforging parts has a little change and held fine spherical grains.The compositions in the different places of the parts are the same.Based on the above results,a high quality parts will be obtained by thixoforging process.

基金项目：

江苏省高校自然科学基础研究项目资助(07KJD460007);; 常州工学院自然科学研究项目资助(YN06043)

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