Abstract
This research investigates the mechanical properties of a Cr–Ni–Mo‐alloyed rock drill steel tempered at different temperatures from 150 to 550 °C. The highest strength, hardness, and impact energy occur when the steel is tempered at 180 °C. Strength, hardness, and impact energy decrease with increasing tempering temperature from 180 to 400 °C. For tempering temperatures higher than 400 °C, the steel exhibits: 1) an increase in impact energy; 2) an increase in strength and hardness when tempered at 420, 450, and 480 °C; and 3) a gradual decrease in strength and hardness when tempered at temperature higher than 480 °C. The mechanism of the changes of impact energy and hardness with tempering temperature is proposed.
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