Deformation characteristics of fine grained magnesium alloy AZ31B thin sheet during rapid gas blow forming

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题名:	Deformation characteristics of fine grained magnesium alloy AZ31B thin sheet during rapid gas blow forming
作者:	Sun,PH;Wu,HY;Hsu,WC;Tsai,HH;Huang,CC;Lee,S
贡献者:	機械工程學系
关键词:	MG ALLOY;ELEVATED-TEMPERATURES;MECHANICAL-PROPERTIES;STRETCH FORMABILITY;2-STAGE DEFORMATION;SUPERPLASTICITY;BEHAVIOR;TECHNOLOGY;CAVITATION;FLOW
日期:	2010
上传时间:	2012-03-27 17:02:16 (UTC+8)
出版者:	國立中央大學
摘要:	Decreasing the forming time in gas blow forming using fine grained Mg alloy AZ31B thin sheet with a thickness of 0.6 mm was studied in this work. Tensile tests and gas blow forming using stepwise pressurisation profiles were performed to explore the deformation behaviour of a fine grained AZ31B Mg alloy sheet. The alloy sheets were successfully deformed into hemispherical domes using two proposed stepwise pressurisation profiles during gas blow forming. As a result, significant reduction in forming time was achieved. Maximum effective deformation rates of 1.02 x 10(-2) and 1.98 x 10(-2) s(-1) were obtained at 300 and 370 degrees C respectively. It was feasible to form a hemispherical dome with a height of 20 mm in less than 80 s at 370 degrees C. The results confirmed that the thickness distribution along the centreline of the formed dome was sensitive to the pressurisation profiles. A higher thinning effect was observed at 370 degrees C due to the higher deformation rate imposed during forming. Grain growth was not a serious problem for forming even at 370 degrees C, and static grain growth should be the major factor resulting in grain growth during forming.
關聯:	MATERIALS SCIENCE AND TECHNOLOGY
显示于类别:	[機械工程學系] 期刊論文

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