From the TTT example in the video, what happens when you reheat the specimen to 700 deg for 20 hour? a. 50P/25B/25M b. 25P/50B/25M c. 100% Spheroidite d. Tempered Martensite

Which could never be an answer when a heat treatment ends at room temperature? a. 50% Austenite 25% Pearlite 25% Bainite b. Spheroidite c. 100% Tempered Martensite d. 50 % Pearlite 50% Martensite

The process of reheating the martensitic steel to reduce its brittleness without any significant loss in its hardness is:

A researcher is heating a metal. He heats the metal so that the temperature of the metal rises at a constant rate. After 30 minutes of heating, the metal is 446°C. After 50 minutes, the metal is 726°C.(a)Choose the statement that best describes how the time and the temperature of the metal are related. Then fill in the blank.As time increases, the temperature of the metal decreases.Thetemperatureofthemetaldecreasesatarateof°Cperminute. As time increases, the temperature of the metal increases.Thetemperatureofthemetalincreasesatarateof°Cperminute. (b)What was the temperature of the metal when the researcher started heating it?°C

A researcher is cooling a metal. She cools the metal so that the temperature of the metal drops at a constant rate. After 13 minutes of cooling, the metal is 339°C. After 25 minutes, the metal is 135°C.(a)Choose the statement that best describes how the time and the temperature of the metal are related. Then fill in the blank.As time increases, the temperature of the metal decreases.Thetemperatureofthemetaldecreasesatarateof°Cperminute. As time increases, the temperature of the metal increases.Thetemperatureofthemetalincreasesatarateof°Cperminute. (b)What was the temperature of the metal when the researcher started cooling it?°C

If 50 kJ of heat are removed from the substance when it is at 50oC, what will be the state and temperature of the substance?