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The bracket is a component that is used in the automotive industry as a rotary driving system on a vibrator system that is used to balance strength, so this component requires a balanced resistance throughout the surface. This study discusses the investigation of bracket failure (fracture) after repairing rotary loading on the assembly unit components, to determine the cause of damage to the bracket required investigation of the type of fracture, the actual manufacturing process of the bracket, the SK-5 spectrometer test material, the distribution of the bracket material, also photo micro. Test and Observation Results: the fracture is brittle type, there is initial crack propagation in visual fault, the austempering process there is a difference in the amount of mass content (kg) 12 46 kg, the fracture has fluctuations in the race 48-55 HRC and the distribution is not accounted for 550-760 HV depth 0.5 mm, showing the spread of pearlite in the 100x and 200x magnification bainite phase. From the results of examinations and observations, it can be concluded that the phenomenon of fracture in the bracket occurs because of the pearlite phase in bainite. This shows the effect of uneven temperature on the austempering process so that the phase transforms a part of the workpiece in the figure <720 ° C, causing an incorrect distribution of coordination on the entire surface of the bracket and shore mark which causes crack propagation.

ANALISIS FENOMENA PATAHAN BRACKET AKIBAT PEMBEBANAN SISTEM ROTARY MATERIAL SK-5