Chapter 9 Flashcards
What is Hardenability?
It is the depth to which a material is hardened after heat treatment process
What are the two types of metal alloys?
Ferrous and Non-Ferrous
What occurs when Steel goes from a low alloy to high alloy concetration?
Increase in strength and cost, decrease in ductility
What is a metal alloy?
A substance that combines more than one metal or mixes a metal with another non-metallic element
What is Cast Iron?
A ferrous alloy with a wt% of C less than 2.1, low melting point - reletively easy to cast - generally brittle.
What are the charactersitics of Gray Iron?
Graphite flakes, weak and brittle in tension, stronger in compresssion, excellent vibrational damoening, wear resistant.
What are the charactersitics of Ductile Iron (nodular)
Graphite as nodules (sphere like particles) not flakes, stronger and more ductile in comparison to gray iron.
What is White Iron?
Pearlite + Cementite, very hard and brittle.
What is Malleable Iron?
Heat treated white iron 800-900 C, reasonably strong and ductile, graphite in rosettes.
What is Graphite Iron?
Relatively high thermal conductivity, good resistance to thermal shock, lower exidation temperatures.
Limitations of Ferrous Alloys?
1) Reletively high densities
2) Relatively low electrical conductivities
3) Generally porr corrosion resistance
Difference between Ferrous and Non-Ferrous Metals?
Ferrous metals contain iron and Non-Ferrous metals do not.
Main types of Non-Ferrous metals.
Copper, Aluminium, Magnesium, and Titanium alloys, also Noble (Ag, Au, Pt) and Refractory (Nb, Mo,W,Ta) metals.
