MMET 207 Exam 2 Questions With
Correct Answers
Hardenability - CORRECT ANSWER✔✔-Ability to form martensite
| | | | | |
Aluminum - CORRECT ANSWER✔✔-Killing agent in steel (Removes
| | | | | | | |
Oxygen)
Aids Nitriding
|
Sulfur & Phosphorous (Good) - CORRECT ANSWER✔✔-Improve
| | | | | | |
machinability
Sulfur & Phosphorous (Bad) - CORRECT ANSWER✔✔-Reduce
| | | | | | |
weldability, ductility and toughness
| | |
Chromium Oxide - CORRECT ANSWER✔✔-Type of corrosion that stays
| | | | | | | | |
on surface and protects the metal
| | | | |
Chromium - CORRECT ANSWER✔✔--Stainless Steels (11.5%)
| | | | |
-Increases hardenability - causes slower cool, but more martensite
| | | | | | | |
-Increases high-temperature strength
| |
,-Increases tensile and creep strength
| | | |
Chromium Carbides - CORRECT ANSWER✔✔-Hard and wear resistant
| | | | | | | |
particles (microconstituents)
|
Nickel - CORRECT ANSWER✔✔--Increases hardenability (not as much as
| | | | | | | | |
Cr)
-Increases toughness even in low temperature
| | | | |
-Promotes Austenitic Structure | |
Through Hardening - CORRECT ANSWER✔✔--Cool something over 1
| | | | | | | |
inch in diameter
| | |
Ex. Nickel helps
| |
Copper - CORRECT ANSWER✔✔--Bonds to oxygen to form a corrosion
| | | | | | | | | |
layer
-Rust layer stays on the metal easier
| | | | | |
-Steel that weathers has a high copper content
| | | | | | |
-Increases toughness |
*Copper Build-up in recycling process* - CORRECT ANSWER✔✔-
| | | | | | |
*Lowers Impact Strength* | |
, -The use of pig iron combats this
| | | | | |
Manganese - CORRECT ANSWER✔✔-Add to "tie up the sulfur"
| | | | | | | | |
(Combats bad sulfur impacts)
| | |
-Increases hardenablilty |
Free-machining steels - CORRECT ANSWER✔✔-Sulfur and manganese | | | | | | |
pre-added
-Do not weld
| |
*Silicon* - CORRECT ANSWER✔✔-Killing agent of oxygen
| | | | | |
Improves toughness and hardenability
| | |
*Improves fluidity of molten metal*| | | |
Molybdenum - CORRECT ANSWER✔✔-Promotes grain refinement
| | | | |
Smaller, finer grains above the AC3
| | | | |
Improves ductility, hardenability, and high-temp strength
| | | | |
Vanadium - CORRECT ANSWER✔✔-Promotes grain refinement
| | | | |
Improves hardenability |
Creates carbides making harder spots for stronger but not too brittle
| | | | | | | | | | |
material
Correct Answers
Hardenability - CORRECT ANSWER✔✔-Ability to form martensite
| | | | | |
Aluminum - CORRECT ANSWER✔✔-Killing agent in steel (Removes
| | | | | | | |
Oxygen)
Aids Nitriding
|
Sulfur & Phosphorous (Good) - CORRECT ANSWER✔✔-Improve
| | | | | | |
machinability
Sulfur & Phosphorous (Bad) - CORRECT ANSWER✔✔-Reduce
| | | | | | |
weldability, ductility and toughness
| | |
Chromium Oxide - CORRECT ANSWER✔✔-Type of corrosion that stays
| | | | | | | | |
on surface and protects the metal
| | | | |
Chromium - CORRECT ANSWER✔✔--Stainless Steels (11.5%)
| | | | |
-Increases hardenability - causes slower cool, but more martensite
| | | | | | | |
-Increases high-temperature strength
| |
,-Increases tensile and creep strength
| | | |
Chromium Carbides - CORRECT ANSWER✔✔-Hard and wear resistant
| | | | | | | |
particles (microconstituents)
|
Nickel - CORRECT ANSWER✔✔--Increases hardenability (not as much as
| | | | | | | | |
Cr)
-Increases toughness even in low temperature
| | | | |
-Promotes Austenitic Structure | |
Through Hardening - CORRECT ANSWER✔✔--Cool something over 1
| | | | | | | |
inch in diameter
| | |
Ex. Nickel helps
| |
Copper - CORRECT ANSWER✔✔--Bonds to oxygen to form a corrosion
| | | | | | | | | |
layer
-Rust layer stays on the metal easier
| | | | | |
-Steel that weathers has a high copper content
| | | | | | |
-Increases toughness |
*Copper Build-up in recycling process* - CORRECT ANSWER✔✔-
| | | | | | |
*Lowers Impact Strength* | |
, -The use of pig iron combats this
| | | | | |
Manganese - CORRECT ANSWER✔✔-Add to "tie up the sulfur"
| | | | | | | | |
(Combats bad sulfur impacts)
| | |
-Increases hardenablilty |
Free-machining steels - CORRECT ANSWER✔✔-Sulfur and manganese | | | | | | |
pre-added
-Do not weld
| |
*Silicon* - CORRECT ANSWER✔✔-Killing agent of oxygen
| | | | | |
Improves toughness and hardenability
| | |
*Improves fluidity of molten metal*| | | |
Molybdenum - CORRECT ANSWER✔✔-Promotes grain refinement
| | | | |
Smaller, finer grains above the AC3
| | | | |
Improves ductility, hardenability, and high-temp strength
| | | | |
Vanadium - CORRECT ANSWER✔✔-Promotes grain refinement
| | | | |
Improves hardenability |
Creates carbides making harder spots for stronger but not too brittle
| | | | | | | | | | |
material
