Publication: Effect of cold deformation on tribological performance of additive manufactured aluminum alloy er 5356
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Date
2023-09-01
Authors
Muhammad Faris Akmal Bin Md. Azlin
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Abstract
As a result of severe sliding wear, the automotive parts are often sent to landfills instead of being repaired or remanufactured. Metal additive manufacturing is now an alternative for reconstructing the damaged section. Despite that, the properties of the part may be affected due to heat during welding. Post-weld deformation, like cold deformation, is known as one of the property enhancement methods used to retain mechanical properties. The effect of cold deformation on the wear performance of aluminum alloy ER 5356 was investigated in this study using MIG-based wire arc additive manufacturing (WAAM). The cold forging process was conducted at room temperature and deformed using a 100-ton mechanical press machine. Unforged and forged specimens were compared to obtain specific wear rates for dry and wet sliding. It was observed that forged specimens have a lower specific wear rate than unforged specimens for both dry and wet cases at various speeds with applied loads. The range of the specific wear rate (mm3/Nm) for unforged specimens for dry sliding was 4.25 x 10-5 to 6.29 x 10-5 mm3/Nm, while for wet sliding, the specific wear rate ranges between 8.91 x 10-6 and 1.41 x 10-5 mm3/Nm. On the other hand, for forged specimens, the ranges of the specific wear rate in dry and wet sliding cases were 2.89 x 10-5 to 5.28 x 10-5mm3/Nm and 2.07 x 10-6 to 4.68 x 10-5 mm3/Nm, respectively. The coefficient of friction (COF) for unforged and forged specimens in dry sliding for all speeds and applied loads decreases as the specific wear rate increases. However, COF for wet sliding is lower for both unforged and forged samples. The cold forging process provides a lower specific wear rate and COF for wet and dry cases compared to unforged samples. Based on this study, cold forging shows a good and potential alternative to reverse the properties such as the tribological performance for part repair or remanufacturing.