Transactions of Materials and Heat Treatment

Title：Study on semi-solid billet prepared by SIMA method

Authors： HAN Fei YU Xiao WANG Wei-wei (School of Materials Science and Engineering Harbin Institute of Technology at Weihai Weihai 264209 China)

Unit：

KeyWords： SIMA semi-solid 7A09 extrusion isothermal treatment

ClassificationCode：TG249.9

year,vol(issue):pagenumber：2008,33(6):66-68

Abstract：

SIMA was adopted to make semi-solid billet.7A09 cast ingot of Ф33 mm×15 mm was used to make billet by direct extrusion and isothermal treatment.The billet was observed by metallographic method in order to determine the parameters for making the semi-solid billet.The main factors in this experiment were extrusion ratio,isothermal temperature and holding time.The results show that the preferred values are extrusion ratio of 7,mould temperature of 300 ℃,cast condition sample's heating temperature of 450 ℃ and holding for 30 min and lower extrusion velocity in the process of billet pretreatment.In the process of isothermal treatment,heating temperature of 617 ℃ and holding for 19 min can acquire perfect semi-solid microstructure.

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Reference：

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