- Please Include Explanation 1 (65.64 KiB) Viewed 47 times
Consider a 0.2 wt% Cr - 99.8 wt% Cu alloy. Which of the following methods could be used to precipitation harden this alloy? Liquid melt 1200 X+ melt 1083°C 1000 α 800 a+Cr 600 400 200 0,2 0,4 0,6 0,8 Chromium 100 99,8 99,6 99,4 99,2 Copper Heat to 1400 °C, then slow cool to room temperature to give Cr precipitates in the structure. O It is not possible to precipitation hardened this alloy. Heat to 1050°C and hold for a sufficient time to form the Cr precipitates and cool to room temperature. Heat to 1400°C; quench to room temperature and then reheat to just below 1083°C for the required time to form the precipitates before slow cooling to room temperature. O Heat to 1050°C, quench to room temperature and reheat to 600°C and hold for the required time to form fine precipitates before slow cooling to room temperature. Temp °C