404 Hot forging of magnesium alloy plate produced by semi continuous strip casting process

In the continuous strip casting process a meniscus forms a compliant boundary between the casting nozzle and transporting conveyor. Movement of this meniscus during casting has been shown to create surface defects, which require extensive cold work to remove and limit the minimum thickness for which sections may be cast. This paper discusses experimental work conducted to test an analytical model of the meniscus oscillation. A high frame rate shadowgraph technique was used on an isothermal water model of the casting process to observe meniscus motion, and thus allowing the calculation of meniscus frequency, amplitude, contact points and contact angles. Both natural frequency and flow excited tests were conducted. Natural frequency tests were also conducted using mercury as the working fluid, having a non-wetting contact angle, typical of molten metals. The experimental results were found to be in good agreement with the predictions of theory for both wetting and non-wetting conditions. The experimentally verified analytical model for meniscus motion is valuable to the design of the continuous casting process, because it offers an opportunity to mitigate the effects of boundary motion on surface quality.

Download Full-text

Continuous Strip Casting of Magnesium Alloy by a Horizontal Twin Roll Caster

Continuous Casting ◽

10.1002/9783527607969.ch7 ◽

2006 ◽

pp. 70-76

Author(s):

H. Watari ◽

T. Haga ◽

N. Koga ◽

K. Davey

Keyword(s):

Magnesium Alloy ◽

Strip Casting ◽

Twin Roll Caster ◽

Twin Roll ◽

Continuous Strip

Download Full-text

Effects of Rolling Condition on Warm Deep Drawability of Magnesium Alloy Sheets Produced by Twin-Roll Strip Casting

Materials Science Forum ◽

10.4028/www.scientific.net/msf.475-479.489 ◽

2005 ◽

Vol 475-479 ◽

pp. 489-492 ◽

Cited By ~ 3

Author(s):

Hisaki Watari ◽

Keith Davey ◽

M.T. Alonso Rasgado ◽

L.D. Clark ◽

Ryoji Nakamura ◽

...

Keyword(s):

Magnesium Alloy ◽

Magnesium Alloys ◽

Casting Process ◽

Strip Casting ◽

Drawing Ratio ◽

Deep Drawability ◽

Cast Magnesium Alloy ◽

Cast Magnesium ◽

Hot Rolled ◽

Twin Roll

Effects of rolling conditions on warm deep drawability of cast magnesium alloy that were hot rolled after roll strip casting were investigated to ascertain the feasibility of twin-roll strip casting process of AZ31B magnesium alloy. Hot rolling and heat treatment conditions were changed to examine which conditions were appropriate for producing AZ31B wrought magnesium alloys after strip casting process. Microscopic observation of the crystals of the manufactured wrought magnesium alloys was performed. It has been found that a limiting drawing ratio of 2.7 was possible in a warm deep drawing test of the cast magnesium alloy sheets after being hot rolled.

Download Full-text

Study on CO2 Laser Welding of AZ31 Magnesium Alloy Sheet Produced by Strip Casting Process

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.228-229.1012 ◽

2011 ◽

Vol 228-229 ◽

pp. 1012-1016

Author(s):

Jun Wei Zhang ◽

Xiao Dong Hu ◽

Dan Zhang

Keyword(s):

Magnesium Alloy ◽

Dendritic Structure ◽

Base Material ◽

Casting Process ◽

High Heat ◽

Alloy Sheet ◽

Strip Casting ◽

Az31 Magnesium Alloy ◽

Magnesium Alloy Sheet ◽

Az31 Magnesium Alloy Sheet

Strip casting process is a kind of promising near net shape technology for producing magnesium alloys strip. The microstructure and mechanical properties of CO2 laser welded as-cast AZ31 magnesium alloy sheet were investigated. The microstructure of base material (BS) was typical columnar dendritic structure. A significant grain refinement occurred in the fusion zone (FZ) due to the rapid cooling, while an obvious grain coarsening occurred in the heat affected zone (HAZ). The tensile strength and elongation at fracture of weld joints were reduced due to the weld depression caused by high heat input. The hardness in the FZ was the highest due to fine grains, while there was a decrease in hardness of the HAZ, but little variation compared with the hardness of the BS.

Download Full-text