This project aims to study the comparison between the annealing process. Normalization and cleansing processes that affect the microstructure. And mechanical properties of the joints of the drilling soil made from cast steel and low alloy AISI 4140 by annealing at 950 ° C, baking time infusion of 2, 3, 4, and 5 hours, and then be checked and analyzed. Microstructure And mechanical properties
test results. Annealing process that has a hardness of 150 HV ability to bend that has a fracture toughness. Racing normalization process and has a hardness of 189 HV in the three curved lines that are brittle. And the monitoring and analysis of microstructures with a photo that resembles a ferrite microstructure and Purple Light, which is not suitable for practical use.
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