Materials Science and Properties Flashcards
What remains constant during a phase change?
Temperature
What are the characteristics of martensite?
Martensite is a hard, strong, and brittle material formed by rapid cooling of austenite.
When is Gibbs Phase Rule applicable?
When both temperature and pressure are varied.
Will the reaction with the higher potential act as the cathode or anode?
Anode.
What is the liquidus line?
The boundary above which no solid can exist.
What is the solidus line?
Boundary blow which no liquid can exist.
What is the hardest form of steel?
Martensite
Which processes increase the deformation resistance/hardness of steel?
Surface hardening and adding certain alloying elements/metals.
Which processes increase the ductility (deformation capability) of steel?
Tempering and hot working.
What happens if a metal being corroded is coating with a less electropositive metal?
The less electropositive/cathodic metal (i.e. higher negative reduction potential) will corrode.
What is the term for the ratio of stress to strain below the proportional limit?
Young’s Modulus
What do impact tests determine?
They measure the energy needed to fracture the test sample (toughness parameter).
What is the fatigue limit (also known as endurance stress or endurance limit)?
The maximum stress that can be repeated indefinitely without causing the specimen to fail.
What is the ductile-to-brittle transition temperature?
The temperature at which an impact of 20 J will cause failure. It is important for structures used in cold environments.
