Exam (elaborations)
MMET 207 Exam III- Questions & Answers
- Course
- Institution
MMET 207 Exam III- Questions & Answers
[Show more]
Content preview
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
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller ExamRoom. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77988 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now