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MMET 207 Exam III- Questions & Answers
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MMET 207 Exam III- Questions & Answers
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MMET 207 Exam III- Questions &Answers
What is the numbering system for malleable cast irons? Correct Ans-5 digit number; the first
three digits correspond to the minimum yield strength and the last two with percent elongation
How is ductile cast iron made? Correct Ans-cerium or magnesium are added into the ladle
What is the numbering system of ductile cast iron? Correct Ans-The first two or three digits
are the tensile strength, the second digits are the yield strength and the last digits are the percent
elongation;
Grade 5 is lowest strength, highest ductility
Grade 1 is highest strength, lowest ductility
How do cast steels compete with all the cast irons in modulus and impact strength and other
properties? Correct Ans--cast irons have lower stiffness, toughness and ductility than steels
-cast irons can't be welded
-cast irons melt at a lower temp and have lower shrink rates
What does silicon do for cast irons? Correct Ans-aids fluidity
What are the properties of 1000 series aluminum? Correct Ans--used in electrical and
chemical fields
,-excellent corrosion resistance
-high thermal and electrical conductivity
low mechanical properties and excellent workability
-moderate increases in strength from strain hardening
-iron and silicon major impurities
What are the characteristics of 2000 series aluminum? Correct Ans--heat treatable-require
solution heat treatment to obtain best properties
-in heat treated condition, mechanical properties close to or even exceed mild steel
-may require artificial again
-do not have as food corrosion resistance as most other Al alloys
often clad with 6000 series or pure Al
-2024 best known alloy
What are the properties of 3000 series aluminum? Correct Ans--non heat treatable
-limited manganese addition-1.5%
-3003 general purpose alloy
-moderate strength
-good workability
What are the characteristics of 4000 series aluminum? Correct Ans--silicon lowers melting
point without causing brittleness
-used in welding wire and brazing alloys
, -non heat treatable
-when diluted with heat treatable alloys in welding become moderately heat treatable
=become dark gray when anodized
What are the characteristics of 5000 series aluminum? Correct Ans--Mg most effective and
widely used alloy for Al
-moderate to high strength non-heat treatable alloy
-Mg more effective than Mn as hardener
-good welding characterisitcs
-greater solubility in Al than Mn
-good resistance to marine atmospheric corrosion
-may have problems with stress corrosion cracking at higher service temperatures, higher cold
work higher Mg content
What are the characteristics of 6000 series aluminum? Correct Ans--forms magnesium
silicide
-heat treatable
-less strong than 2000 or 7000
-good formability
-good corrosion resistance
-medium strength
-6061-most widely used and versatile Al Alloy
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