Metallurgy Flashcards
The property of the metal to resist penetration is
Hardness
Tendency to fracture without change in shape is called
Brittleness
The property of the metal to allow itself to be deformed permanently with out rupture is
Malleability
The property of a metal which allows it to be drawn without breaking is known as
Ductility
The weight of a unit volume of a metal is
Density
The range of heating temperature, when the internal structure of metal is altered is known as
Critical Range
The process of heating metal above the critical stage and then cooling slowly is known as
Annealing
Quenching process in heat treatment is performed by quenching the heated metal in
Oil or Water
The re - heating of hardened metal to a temperature below critical range and followed by cooling is the process of
Tempering
Case hardening is the process to harden the
Surface of the metal
The deformation of material caused by an applied load is termed as
Strain
The Load limit up to which the metal can with stand with out permanent deformation or elongation is termed as
Elastic Limit or Yield Point
What is the stress corresponding to the 0.2% of strain from the stress-strain curve of the given ductile material.
Proof Stress
The maximum tensile load per square inch which a material can with stand is known as
Tensile Strength
The property of resisting penetration or permanent distortion is called
Hardness
Which types of heat treatment is used to soften the metals
Annealing
The property of resisting a change in the relative position of molecules or the tendency to fracture without change of shape is called
Hardness
The property of metals which allows them to be bent or permanently distorted without rupture
Ductility
Which of the following properties permits the manufacture of sheets, bar stock, forgings and fabrication by bending and hammering
Malleability
The property which is essential in the manufacture of wire and tubing by drawing
Ductility
The property of returning to the original shape when the force causing the change of shape is removed is called
Elasticity
Each material has a point beyond which if it is loaded, permanent distortion will take place, this point is called
Yield Point
The average melting point of steel is
2500°F
The fusing point of aluminum is
1100°F
The property of transmitting heat or electricity is called
Conductivity
Critical range for the steel is
A1 to A3 Boundaries
Annealing is the process of heating steel __________ critical range.
Above
In annealing, the cooling of the material is
Slow
The annealing process ____________ the metals.
Softens
In normalizing process steel is allowed to cool in ___________.
Still Air
By normalizing, strength of the steel is increased about to
20%
Hardening is composed of
Heating and Quenching
Re-heating of hardened steel to a temperature below the critical range is called
Tempering
Which of the following process relieves internal strains and softens the metals some what lesser than annealing
Normalizing
Strain is the deformation of material caused by an
Applied Load
The load acting on a material is called
Stress
The greatest load per inch of original cross-sectional area, which a material can with stand without a permanent deformation, remaining upon complete release of the load is called
Elastic Limit or Yield Point
The limit beyond which load per square inch increases in, strain cease to be directly proportional to the increase in stress, is called
Proportional Limit
The law of proportionality between stress and strain is called
Hook’s Law
The ratio of unit stress and unit strain is called
Modulus of Elasticity
