18 Questions
The martensite transformation is a diffusion-controlled process.
False
The temperature range for the formation of martensite is between 600°C to 400°C.
True
The resulting microstructure of martensite transformation is composed of ferrite and cementite.
False
The formation of martensite requires a specific percentage of carbon in the alloy.
True
The austenite to martensite transformation is a slow process that occurs over a long period of time.
False
The microstructure of martensite is characterized by the presence of pearlite.
False
Tempering reduces internal stresses caused by quenching in martensite transformation.
True
The process of tempering produces extremely large Fe3C particles surrounded by α.
False
The increase in C content results in a decrease in TS and YS.
False
Pearlite is a hard phase in the Fe-C system.
False
Hypereutectoid alloys have a C content less than 0.76 wt%.
False
Fine pearlite has a larger microstructure than coarse pearlite.
False
Increasing the austenite grain size increases the alloy strength.
False
A slower cooling rate produces finer lamellae in the pearlite.
False
The transformation temperature of 675°C corresponds to the eutectoid composition of 0.77 wt% C.
True
Austenite is stable at temperatures above 727°C.
True
Rapidly cooling to 625°C and then holding it constant is an example of an isothermal transformation.
True
The rate of transformation of austenite to pearlite increases with increasing ΔT.
False
Test your knowledge of materials science, focusing on pearlite formation, microstructure, and the effects of temperature on its composition. Covers topics like cementite, ferrite, and bainite. Based on the 3rd edition of Callister & Rethwisch's Fundamentals of Materials Science and Engineering.
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