DSpace
 

Researchspace >
General science, engineering & technology >
General science, engineering & technology >
General science, engineering & technology >

Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/4379

Title: Application of shortened heat treatment cycles on A356 automotive brake calipers with respective globular and dendritic microstructures
Authors: Moller, H
Govender, G
Stumpf, WE
Keywords: Semi-solid metal
Heat treatment
Brake caliper
Gravity die casting
Automotive
Nonferrous metals
Issue Date: Sep-2010
Publisher: Editorial office of Transactions of Nonferrous Metals Society of China
Citation: Moller, H, Govender, G and Stumpf, WE. 2010. Application of shortened heat treatment cycles on A356 automotive brake calipers with respective globular and dendritic microstructures. Transactions of Nonferrous Metals Society of China, Vol. 20(9), pp 1780-1785
Abstract: The conventional casting alloy A356 is probably one of the most popular alloys used for semi-solid metal (SSM) forming. This is due to its high fluidity and good castability. This alloy can be heat treated alternatively to the T4, T5 or T6 temper conditions. Previous work by the authors has shown that shorter heat treatment cycles can be applied for SSM processed A356 rather than the more costly traditional cycles (that were originally developed for liquid cast dendritic A356). The previous work was performed on relatively small rectangular plates (4×80×100mm3) that were cast in steel moulds with a 50 ton high pressure die casting (HPDC) machine. This work determined whether these short heat treatment cycles (T4, T5 and T6) can be applied successfully to a larger (and more complex) casting too. Since the automotive industry has many possible applications for SSM-HPDC parts, the newly developed heat treatment cycles, as well as the traditional heat treatment cycles, were applied to A356 brake calipers cast using a 630 ton HPDC machine. Vickers hardness measurements at a cross section of the brake calipers were performed, indicating that similar values can be obtained when using the significantly shorter heat treatment cycles. Finally, the typical tensile properties that can be obtained for SSM-HPDC A356 brake calipers are compared with those manufactured by gravity die casting. These results indicate that the differences in microstructures (globular or dendritic) do not have a noteworthy effect on the heat treatment response. This implies that the short heat treatment cycles originally developed for globular SSM-HPDC A356 castings can be successfully applied to dendritic liquid A356 castings too.
Description: Copyright: 1997-2008 Editorial office of Transactions of Nonferrous Metals Society of China
URI: http://www.ysxbcn.com/html_readOnline/En_14404.html
http://hdl.handle.net/10204/4379
ISSN: 1003-6326
Appears in Collections:Metal and metal processes
Manufacturing science and technology
General science, engineering & technology

Files in This Item:

File Description SizeFormat
Moller3_2010.pdf816.39 kBAdobe PDFView/Open
View Statistics

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback