Question

Consider 0.80 kg of austenite containing 1 wt cooled to below ____.

a) 500 °C
b) 600 °C
c) 700 °C
d) 800 °C

Answer 1

The question revolves around the cooling of austenite and its phase transformation in iron alloys.The precise transformation temperature is typically below the eutectoid temperature of d. 727°C for steels with 1 wt% alloying element.

Step-by-step explanation:

The question you are asking is related to the transformation of austenite into other phases of iron, which occurs when it is cooled from high temperatures. Specifically, austenite, which has a face-centered cubic (fcc) structure, will transform into a body-centered cubic (bcc) structure iron, known as ferrite, when it is cooled below 727°C, though for pure iron, this starting transformation temperature would be 910°C. Without additional context, it's difficult to determine the exact temperature for a 1 wt% alloy as alloying elements can alter the transformation temperatures. However, the provided options suggest that we are dealing with an alloy, in which case the eutectoid transformation temperature would be less than that of pure iron.

For the scenarios presented in the reference information, the different temperature changes involve melting of ice, heating of water, and the specific heat capacities of various materials. While interesting, these topics are not directly related to the question about the cooling of austenite and its transformations.