MATERIAL DEVELOPMENT FOR FLARED CHISSEL BUCKET TEETH FROM MANGANESE STEEL 12 A SUBSTITUTION OF HIGH STRENGTH LOW ALLOY FOR TIN UNDERSEA MINING

• Main Author: Kurniawan
• Format: Dissertations
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/42947
• Institution: Institut Teknologi Bandung

The use of Flared Chissel Bucket Teeth (FCBT) contributes to the less optimal performance of tin sand excavation with Bucket Wheel Dredge (BWD) technology. For this reason, a comprehensive study is needed regarding the characterization of BWD technology operations which leads to the development of FCBT material. The development base uses existing FCBT material from HSLA which is transformed into martensite when experiencing impact loading and abrasive transformation induced plasticity (TRIP). Deformation that occurs during the use of FCBT is only 5.6% so that the hardness caused by plastic deflation is not effective enough. Austenite Manganese steel with a content of 12% Mn has the ability to be hardened high when getting a load at a high rate , so it has good wear resistance. Austenite Manganese Steel is widely used in components that have good wear resistance and are able to withstand impact loads. The problems studied include field measurements of the mechanical properties of materials related to wear resistance, determination of manganese steel development parameters and assessment of the effect of chrome carbides on wear resistance. The results showed the optimum specimens of manganese steel with a content of 12% Mn, 2.6% Cr with Martemper treatment at 200°C and held back at 450°C and cooled with a cooling rate of 240°C / min with hardness of 278 BHN and 32.7J. Comparison of endurance performane in the wear testing referring to ASTM G65 is the maximum specimen has wear resistance 3.24 mg / min compared to 4.28 mg / min in existing materials. The presence of Chrome carbides in sufficient quantities gives a better wear rate than existing materials. The hardness of the material developed can still increase by 20% if it receives plastic deformation of 10%.