Exam (elaborations)
CWB Level 3 Module 21 Practice Questions And 100% Correct Answers
- Course
- Institution
CWB Level 3 Module 21 Practice Questions And 100% Correct Answers...
[Show more]
Content preview
CWB Level 3 Module 21 Practice Questions And 100%Correct Answers
The maximum solubility of carbon in a iron is:
(a) 2% .
(b) 0.002%.
(c) 0.02%.
(d) There is no solubility. - Answer (c) 0.02%.
True or false?
When a steel is heated into the austenite region, all carbon and most other compounds
dissolve
to form a single phase. - Answer True
True or false?
Pearlite is a single phase. - Answer False
What is the resulting structure of a 0.6% carbon steel slowly cooled from 900°C to room
temperature? - Answer About 25% proeutectoid ferrite and 75% pearlite
Most fine grain steels retain their fine grains: (
(a) up to the melting temperature.
(b) up to the grain coarsening temperature, but above that behave as coarse grain steel.
C
(c) only up to the transformation temperature. - Answer (b)
, Why is martensite produced rather than pearlite when a
steel is rapidly quenched from, 900°C? - Answer Insufficient time for carbon to diffuse to
form carbides
The hardness of martensite depends mainly on the:
(a) alloy content.
(b) rate of cooling.
(c) carbon content.
(d) size of the part. - Answer (c)
Can bainite normally be produced in continuous cooling of a plain carbon steel? -
Answer No
Increasing the carbon content:
(a) lowers the martensite start temperature M.
(b) raises the M.
(c) does not affect M. - Solution (a) decreases the martensite start temperature M.
Calculate the ideal critical diameter (hardenability) for a steel containing 0.2%C,
0.25%Si, 1
.0%Mn,
0.5%Cr, 0.5%Mo, 1.0%Ni (assuming an initial grain size of ASTM 8). Use section 2.5.3
and 2.5.4
as a guide. - Solution 5.0
Using Figure 2.34, estimate the quickest rate a weld could cool without the HAZ
becoming
harder than 350 HV for a
Steel of 0.2%C, 0.18%Si, t2%Mn, 0.35%Cr. - Answer 30C/s at 540 C
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 Chrisyuis. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $11.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77254 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now
