Abstract
The need for quenched and tempered steel increased, especially for the manufacture of the combat vehicle components. This steel is classified as high-strength and hardness and is bullet-resistant steel (armor steel). Maintaining the stability of steel hardness is very important because the quality standard for armor steel is hardness. High hardness causes brittleness increase, and tempers are needed to reduce it (residual stress is relieved by temper). Austenite temperature and temper affect steel hardness and wear resistance of quenched and tempered steel. To obtain hardness and wear due to the influence of quench and temper on hot rolled plate steel as the armor steel candidate. The material used in this research is hot rolled plate steel made in Indonesia with a carbon content of 0.29 %. The method used is heating the material to 900 °C, 885 °C and 870 °C (held for 45, 30 and 15 minutes) and cooling in water and quenched steel is produced. Quenched steel is heated to 150 °C (held for 45, 30 and 15 minutes) and cooled in atmospheric air. Optimum heat treatment parameters, the Taguchi and ANOVA methods were used. From the parameters and level of heat treatment chosen, the number of specimens needed can be known. The parameter of heat treatment has a strong influence on hardness, and ANOVA can obtain wear. Optimum hardness and wear are 566.48 HVN (±532 BHN) and 2.01×10 −9 mm 2 /kg, respectively. Both are influenced by austenite and temper temperature.
Highlights
Quenched and tempered (Q&T) steels are used in military applications due to high hardness, high strength to weight ratio, and excellent toughness [3]
Based on equation (5), heat treatment parameters and responses in the orthogonal matrix L9 (34) for hardness, average hardness, and hardness to levels are shown in Tables 3, 4, respectively
The residual stress can be released by a tempering temperature of 150 °C because there is no martensite diffusion by temper heat
Summary
High-strength and hardness steel is often used to make bullet-resistant components of military need. The limits for bullet-resistant steel (armor steel) are unclear, and hardness is important [1, 2]. Quenched and tempered (Q&T) steels are used in military applications due to high hardness, high strength to weight ratio, and excellent toughness [3]. Armor steel that has the highest ballistic resistance is AISI 4340 with a hardness of 50 HRC=485 BHN [4]. Keeping hardness stability is essential because this is a quality standard for armor steels. The austenite and temper temperature will affect the Q&T Steel hardness and wear resistance. The use of the optimum austenite and temper temperature is very important to obtain the hardness and wear of quenched and tempered steel
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