摘要
研究不同压下率条件下的热轧+应变诱发熔化激活法(SIMA,strain-induced melt activation)工艺制备的7075合金半固态坯料组织的演变规律,分析了热轧SIMA工艺RD方向和TD方向半固态组织的区别,并探讨热轧SIMA工艺半固态组织形成机制。结果表明:随着热轧压下率的增加,半固态固相颗粒尺寸逐渐减小,颗粒的均匀性、球形率逐渐提高,液相率亦逐渐增加;但热轧压下率从60%提高到80%时,液相率变化不明显,此时TD方向的液相分布均匀,RD方向的液相则出现了明显的偏聚;热轧SIMA工艺的半固态显微组织形成机制遵循了SIMA技术原理。
The microstructure evolution of 7075 aluminum alloy semi-solid billet by hot rolling and semi-solid isothermal treatment processing（ short for hot rolling SIMA） under different hot rolling reductions was investigated. The difference of the semi-solid microstructure between RD direction and TD direction was analyzed. And the forming mechanism of the semi-solid microstructure by the hot rolling SIMA processing was discussed. The results show that with the increasing of the hot rolling reduction,the grain uniformization and sphericity and the liquid fraction increase,however,the grain size decreases. But while the hot rolling reduction increases from 60% to 80%,the liquid fraction increases slowly; the liquid area of the TD direction still maintained a uniform distribution and the liquid area of the RD direction cluster obviously. The forming mechanism of the semi-solid microstructure by the hot rolling SIMA processing follows the SIMA theory.
出处
《金属热处理》
CAS
CSCD
北大核心
2017年第10期189-192,共4页
Heat Treatment of Metals
基金
国家自然科学基金(51474091)
唐山市科技创新团队培养计划(15130202C)
华北理工大学研究生创新项目(2016S25)
