FINAL Flashcards
Common forms of atomic bonding:
Covalent bonding
Ionic bonding
Metallic bonding
A subatomic particle with a neutral electrical charge
Either electron or neutron…
Find the answer
A type of atomic bonding that occurs in a solid metal when valence electrons leave individual atoms and are shared between all atoms in a free electron cloud
Metallic bonding
Substance consisting of atoms of only one type. May be a solid liquid or gas.
Element
A configuration of atoms, common to metals, as they add to one another in an orderly and repeating three dimensional pattern.
Crystal structure
Crystal structures common to metals:
Face centered cubic
Close packed hexagonal
Body centered cubic
The crystal structure associated with delta iron, chromium, tungsten and vanadium:
Close packed hexagonal
One of the most common microstructural measurements:
Grain size
An austenite transformation product that forms when austenite is COOLED RAPIDLY, resulting in no time for the carbon to diffuse and form pearlier structures.
It’s either..
Cementite
Martensite
Austenite
A compound of iron and carbon referred to as iron carbide
Ce entire
A lamellar aggregate of ferrite and cementite formed from the eutectoid decomposition of austenite during SLOW COOLING
Pear lite
Common families of stainless steels consist of:
Cast, ferritic, precipitation hardening
Aluminums main ingredient
Bauxite
The largest and most widely used family of stainless steels. They have excellent corrosion resistance, weldability, high-temp. Strength, and low-temp toughness and are generally no magnetic
Austeniticstainless
Are the least corrosion resistant family of stainless steels but are known for high levels of strength and abrasion resistance
Mertensitic stainless
A metal designation system consisting of 3 numbers sometimes followed by a letter, such as 304, 304L and 410 stainless steels
AISI
Cast stainless steel structures can be:
Martensitic
Ferritic
Austenitic and duplex
Similar to other metal applications, the desired metallurgical structures of stainless steels are influenced by:
Alloying elements
A stainless steel that has a 2 phase microstructure consisting of ferrite and austenite
Duplex stainless
The precipitation of chromium carbide in austenitic stainless steels. Occurs during operations such as welding or stress relieving. Can severely reduce corrosion resistance.
Sensitization
A key characteristic for a steel to be considered stainless:
Increased immunity to corrosion
The state of matter which exhibits the least amount of energy is:
Solid
A problem occurring in weldments caused by the non-uniform heating produced by the welding operation is:
Distortion
A family of stainless steel zit that can be heat treated to higher rank than any other Steals and are used in critical high strength applications where resistance to fracture propagation is of extreme importance
Precipitation hardening stainless
