18 Questions
What is the minimum percentage of carbon in steel for the formation of BCT martensite?
0.2%
What is the structure of martensite in steels with less than 0.2% carbon?
BCC
Why is martensite in steels very hard and brittle?
It has no closed packed slip planes
What is required to prevent the formation of pearlite in steel?
Rapid cooling from the austenite region
What is the characteristic of the grain size of martensite in steels?
Fine
What is the phase that transforms to martensite in steel?
Austenite
What is the primary microconstituent in hypoeutectoid steel?
Ferrite
Which microconstituent is harder and more brittle?
Cementite
What is the structure of ferrite?
BCC
What is the carbon content of cementite?
6.67%
What is the microconstituent that consists of fine lamellae?
Pearlite
What is the temperature at which the eutectoid transformation occurs in the Fe-C system?
727°C
What is the composition of the alloy at 726°C?
Fe – 0.60% C
What is the microconstituent that forms at the grain boundary of austenite?
Pearlite
What is the result of increasing the C content in a hypereutectoid steel alloy?
Increase in pearlite and cementite
What is the name of the microconstituent that forms at 1148°C in the Fe-C system?
Cementite
What is the term for the microconstituent that forms below 726°C in the Fe-C system?
Proeutectoid ferrite
What is the effect of undercooling on the microconstituents in a hypereutectoid steel alloy?
Increases the formation of pearlite
Test your understanding of the mechanical properties of Fe-C alloys, including their microconstituents, ductility, and brittleness. Learn about the properties of hypoeutectoid and hypereutectoid alloys.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
