EXAM 4 Flashcards
_____________ iron is extremely hard cast iron.
White
_________________________ are graphitizers.
Silicon, Nickel, Copper
______________ irons are gray or ductile irons containing alloying elements that are designed to improve high-temperature strength and oxidation resistance.
Heat-resistant
____________ iron is the most widely used cast iron.
Gray
Carbon and _____________ are the principal alloying elements in cast irons.
Silicon
___________ stainless steels are the most weldable stainless steels.
Austenitic
When __% Cr or more is added to the iron or steel, they become stainless.
12%
__________________ is the principal element influencing the corrosion resistance of stainless steels.
Chromium
The majority of austenitic stainless steels belong to the AISI _________ series.
300
A ________________ film is a film on the outer surface layer of a metal that has superior corrosion resistance.
passive surface
Free-machining coppers are modified copper containing _________________.
sulfer, tellurium, and lead
Welding difficulties of copper alloys are associated with their___________________.
high thermal conductivity, high fluidity, and hot shortness
Brass is a wrought alloy of copper and _________.
zinc
____________ coppers are purified, commercially pure coppers.
tough pitch
Explain how copper alloys are designated.
Copper is designated according to composition and thermal properties
Annealed or cast commercially pure aluminum has _______ of the tensile strength of structural steel.
1/5
_______________ is the selective attack of one metal when it is electrically coupled to another metal in a conductive environment
galvanic corrosion
The _________ series comprises aluminum-silicon alloys.
4XX.X
A ________________ designation is a letter than indicates the final condition of cold-worked (H) or heat-treated (T) material.
temper
List the desirable properties of aluminum.
- low density
- high specific strength
- high electrical and thermal conductivity
- good corrosion resistance
Grade __ is the most widely used titanium alloy.
5
Forming processes for titanium alloys are hampered by ____________________.
notch sensitivity, poor shrinkability, and galling
The primary difference between the various grades of commercially pure titanium is the ____________ content.
interstitial element
The crystal structure of pure titanium at room temperature is __________.
CPH
_____________ behavior is the spontaneous ignition of a metal when scratched or struck.
Pyrophoric
