Podcast
Questions and Answers
What is the minimum percentage of carbon in steel for the formation of BCT martensite?
What is the minimum percentage of carbon in steel for the formation of BCT martensite?
- 0.5%
- 2.0%
- 1.0%
- 0.2% (correct)
What is the structure of martensite in steels with less than 0.2% carbon?
What is the structure of martensite in steels with less than 0.2% carbon?
- HCP
- BCC (correct)
- BCT
- FCC
Why is martensite in steels very hard and brittle?
Why is martensite in steels very hard and brittle?
- It has no closed packed slip planes (correct)
- It has a large grain size
- It has a high percentage of carbon
- It has a low percentage of carbon
What is required to prevent the formation of pearlite in steel?
What is required to prevent the formation of pearlite in steel?
What is the characteristic of the grain size of martensite in steels?
What is the characteristic of the grain size of martensite in steels?
What is the phase that transforms to martensite in steel?
What is the phase that transforms to martensite in steel?
What is the primary microconstituent in hypoeutectoid steel?
What is the primary microconstituent in hypoeutectoid steel?
Which microconstituent is harder and more brittle?
Which microconstituent is harder and more brittle?
What is the structure of ferrite?
What is the structure of ferrite?
What is the carbon content of cementite?
What is the carbon content of cementite?
What is the microconstituent that consists of fine lamellae?
What is the microconstituent that consists of fine lamellae?
What is the temperature at which the eutectoid transformation occurs in the Fe-C system?
What is the temperature at which the eutectoid transformation occurs in the Fe-C system?
What is the composition of the alloy at 726°C?
What is the composition of the alloy at 726°C?
What is the microconstituent that forms at the grain boundary of austenite?
What is the microconstituent that forms at the grain boundary of austenite?
What is the result of increasing the C content in a hypereutectoid steel alloy?
What is the result of increasing the C content in a hypereutectoid steel alloy?
What is the name of the microconstituent that forms at 1148°C in the Fe-C system?
What is the name of the microconstituent that forms at 1148°C in the Fe-C system?
What is the term for the microconstituent that forms below 726°C in the Fe-C system?
What is the term for the microconstituent that forms below 726°C in the Fe-C system?
What is the effect of undercooling on the microconstituents in a hypereutectoid steel alloy?
What is the effect of undercooling on the microconstituents in a hypereutectoid steel alloy?
