metal extraction
What are the most common natural occurring elements
metals
What grains does rapid cooling form?
small
explain tempering
Improve the hardness and elasticity of (steel or other metal) by reheating and then cooling it.
recycled metals later used in the recycling industry/smelting are called..?
secondary raw materials
A heavy metal used in batteries.
lead
What is the most common metal?
Aluminium
How do the smaller gains size affect the properties of the metal?
More brittle
Characteristics/ benefits of Annealing
reduce hardness, increase ductility and help eliminate internal stresses.
conservation of resources, energy sufficient, cost efficient
Why is it good to make hammers out of high carbon steel?
Strong+hard
What are the first steps for converting the ore into a usable material?
washing, grading,crushing
What properties do metals with large grains have?
list two disadvantages of alloying
expensive, can be weak ( must say because of lower melting point or the point is not given)
What are the potential environmental impacts of improper disposal of metal waste?
soil contamination, water pollution, or resource depletion
list two fields and one design crit of super alloys
aerospace, marine industry, chemical processing indust. Creep/ oxidation resistance
explain benefication
separate the desired metal-bearing minerals from the unwanted gangue (waste) minerals.
list four effects/ characteristics that can happen if we manipulate grain size
why does mixing metals makes alloys stronger..?
due to the presence of “foreign” atoms which interfere with the movements of atoms in the crystals during plastic deformation
under what circumstances will steelmaking be considered with reusing metals?
used for high quality tool steels and stainless steel
List one application and one property of the following alloy steels
(i) Stainless Steel; -resistant to rust, manufacturing cutlery and surgical instruments (ii) High Speed Steel.- very brittle, used for drill bits