Metals Flashcards
The correct units for Young’s Modulus are?
N/mm2
Non-Ferrous metals contain?
Up to 10% iron
Good ductility is required in structural steel because of?
Possible impact, explosion, earthquake, etc.
Young’s Modulus (E) of a material measures?
Stiffness
Bronze contains?
Copper
Medium carbon steels are used for construction because?
They combine strength and ductility
Wrought Iron contains? (% carbon?)
No carbon
Increasing the carbon content of steel?
Increases the U.T.S. of the steel
Steel was an important addition to the family of construction materials because of its?
Tensile strength
Cast Iron contains? (% carbon?)
More carbon than steel
Increasing the carbon content of steel?
Increases the yield strength and reduces the ductility
Global consumption is in excess 1,000,000,000 tonnes of metals per year. Of this amount, iron and steel represents?
90% of the total
Steel is an alloy of iron and?
Carbon
Designation mortar mixes are specified by?
BS 5628
Which one of the following metals would work-harden more quickly than the others? Copper, Brass, Lead or Silver?
Brass
Iron-carbon alloys containing carbon ________ 4.3% are known as hyper-eutectic cast irons.
More than
Bell metal contains?
70 - 75% copper and rest tin
The composition of silver solder is?
Silver, copper, zinc
When a steel containing __________ 0.8% carbon is cooled slowly below the lower critical point, it consists of ferrite and pearlite.
Less than
Pipes for bicycle frames are made of
Cold rolled steel
The following element can’t impart high strength at elevated temperature
Magnesium
The percentage carbon content in wrought iron is abou?
0.02
The silicon steel is widely used for?
Generators and transformers in the form of laminated cores
Blast furnace produces following by reduction of iron ore
Pig iron
For a steel containing 0.8% carbon?
There is only one critical point
Nickel in steel?
Gives ductility, toughness, tensile strength and anti-corrosion properties
For safety, the fuse wire used in the mains for household supply of electricity must be made of metal having
Low melting point
For galvanizing iron which of the following metals is used?
Zinc
The element of an electric stove made
Nicrome
Non stick cooking utensils are coated with
Teflon
Tensile strength of steel can be safely increased by
Adding carbon up to 0.83%
Amorphous material is one
In which there is no definite atomic structure and atoms exist in a random pattern just as in a liquid
Steel contains
50% or more iron
The alloy, mainly used for corrosion resistance in stainless steels is
Chromium
Sulphur in steel
Lowers the toughness and transverse ductility
Aluminium bronze contains
10% aluminium and 90% copper
Cast iron is a?
Brittle material
An alloy steel which is work hardenable and which is used to make the blades of bulldozers, bucket wheel excavators and other earth moving equipment contain iron, carbon and
Manganese
Which of the following has a fine gold colour and is used for imitation jewellery?
Aluminium bronze
The ability of a material to absorb energy in the plastic range is called
Resilience
Malleable cast iron is produced
From white cast iron by annealing process
The hardness is the property of a material due to which it?
Can cut another metal
The percentage of carbon in cast iron varies from?
1.7 to 4.5%
Shock resisting steels should have
Toughness
Brass is an alloy of
Copper and Zinc
Iron-carbon alloys containing 1.7 to 4.3% carbon are known as
Hypo-eutectic cast irons
The heat treatment process used for softening hardened steel is
Tempering
The lower critical point for all steels is?
723°C
Manganese bronze has?
High resistance to corrosion
Silicon bronze contains?
96% copper, 3% silicon and 1% manganese
Steel containing 0.8 to 1.5% carbon, is known as?
High carbon steel
The property of a material necessary for forgings, in stamping images on coins and in ornamental work, is?
Plasticity
Steel containing upto 0.15% carbon, is known as?
Dead mild steel
Generically, a ferrous alloy, the carbon content of which is typically between 3.0 and 4.5 wt% C
Cast Iron
A metallic substance that is composed of two or more elements
Alloy
A mode of fracture that involves gross plastic deformation
Ductile fracture
Deformation that is non – permanent, that is, totally recovered upon release of an applied load
Elastic deformation
The measure of a material’s resistance to deformation by surface indentation (e.g. scratches)
Hardness
A metal alloy for which iron is not the prime constituent
Non – ferrous alloy
Deformation that is permanent or non – recoverable after the release of the applied load
Plastic deformation
A steel alloy that is highly resistant to corrosion in a variety of environments. The predominant alloying element is chromium, which must be present in a concentration of at least 11 wt%
Stainless steel
The maximum engineering stress, in tension, that may be sustained without fracture. Often termed ultimate tensile strength
Tensile strength
The stress required to produce a very slight yet specified amount of plastic strain; this strength is normally associated with the onset of plastic deformation
Yield strength
A metal alloy for which iron is the prime constituent
Ferrous alloy
A measure of a material’s ability to undergo appreciable plastic deformation before fracture
Ductility
The ratio of stress to strain when deformation is totally elastic; also a measure of the stiffness of the material
Modulus of elasticity (young’s modulus)
