Experimental Study Of The Effect Working Temperature Variation And Reduction Area In Pressing On The Hardness And Microsstucture (Grain Size) Of Alluminium Composite – Bottom Ash

Ardyanto, Bayu (2019) Experimental Study Of The Effect Working Temperature Variation And Reduction Area In Pressing On The Hardness And Microsstucture (Grain Size) Of Alluminium Composite – Bottom Ash. Undergraduate thesis, Untag 1945 Surabaya.

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Abstract

Metal forming is the process of changing the shape of a workpiece by providing an external force so that plastic deformation occurs. There are various kinds of metal forming processes, one of which is pressing. This study aims to determine the effect of workpiece temperature variation and cross section reduction in the pressing process on hardness and microstructure (grain size) in aluminum composite materials - coal bottom ash. The variation of cross section reduction used in this study was 5%, 10%, 15%, and the temperature variation of the workpiece used in this study was 100 0 C, 110 0 C, 120 0 C. The research method used is a quantitative method with testing and observation in the laboratory. From the test results, variations in cross section reduction and workpiece temperature variations have an effect on hardness, the greater the reduction received by the workpiece and the lower the workpiece temperature the hardness increases due to strain hardening, cross section reduction and workpiece temperature also affect the microstructure (size grain) the lower the temperature of the workpiece and the greater the reduction in cross section received by the workpiece, the grain size will be finer due to the distortion or splitting of grain structure resulting in doubling of dislocation because with temperatures lower than the recrystallization point the workpiece will become increasingly brittle. The lowest hardness value is 22.5 HRA resulting from the pressing process at a 5% reduction in the temperature of 120 C while the highest hardness value is 33.5 HRA resulting from the pressing process at a 15% reduction in temperature of 100 0 C. The smallest grain size was 56.83 µm as a result of the pressing process at a 15% reduction in temperature of 100 C while the largest grain size was 94.9 µm as a result of pressing on a 5% reduction in temperature of 120 0 C. 0 0

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