Study of The Effect of Manganese Content and AustenitizationTemperature on The Microstructure and Mechanical Properties of Manganese Steel

Abstract

High manganese steel or austenitic manganese steel gh manganese steel or austenitic manganese steel commonly are used in mining industries such as the commonly are used in mining industries such as the component in an excavator, hammer mill, crusher, and component in an excavator, hammer mill, crusher, and jaw crusher plates. Those components are the alloy cast jaw crusher plates. Those components are the alloy cast steel with containing manganese (Mn) about 11-18%. steel with containing manganese (Mn) about 11-18%. The mechanical properties of austenitic manganese The mechanical properties of austenitic manganese steel are depending on the amount of manganese and steel are depending on the amount of manganese and carbon. The carbon. The austenitic austenitic steel steel has has three three dominant dominant properties, i.e. high hardness; good wear resistance, and properties, i.e. high hardness; good wear resistance, and high impact resistance. The objectives of this research high impact resistance. The objectives of this research are are investigating investigating the the effect of effect of the the composition composition of of manganese and the austenitization temperature on the manganese and the austenitization temperature on the microstructure and mechanical properties of austenitic microstructure and mechanical properties of austenitic manganese manganese steel. steel. Each Each variation variation of manganese of manganese composition was 5.87%. 9.42% and 15.28%. composition was 5.87%. 9.42% and 15.28%. It was It was heated at 950, 1000 and 1050 C for 60 minutes and then heated at 950, 1000 and 1050 C for 60 minutes and then o o quenched with water. The result showed that the highest quenched with water. The result showed that the highest hardness was hardness was 46 HRC where 46 HRC where the composition the composition of of manganese and the austenitization temperature was manganese and the austenitization temperature was 5.87%. and 1050 C. The lowest hardness number was 5.87%. and 1050 C. The lowest hardness number was o o 16.3 HRC where the content of manganese and the 16.3 HRC where the content of manganese and the temperature was 9.42%. and 1050 C. The results agreed temperature was 9.42%. and 1050 C. The results agreed o o with the microstructure of the increase in carbides and with the microstructure of the increase in carbides and the composition of manganese increased too. For the the composition of manganese increased too. For the wear resistance properties, the optimum one was 6.78 x wear resistance properties, the optimum one was 6.78 x 10-6 mm /m at 10-6 mm /m at 3 3 the composition of manganese and the composition of manganese and temperature of5.87% and 1050 C