Summary
Summary Heat treatment of metals
- Course
- Institution
Overview and detailed exploration of heat treatment of metals. Reviews different types of treatments such as annealing, quenching, and normalising.
[Show more]
Seller
Follow
JAD78
Content preview
Design technology – Heat treatment of metals.What is heat treatment? – Heating and/or rapidly cooling metals to
change their properties.
- To change the properties of metals, they are heated and cooled in
many ways, improving strength, malleability, ductility, brittleness, and
many other properties.
Forms of heat treatment
Quenching – Rapidly reducing the heat of a metal, using a
liquid or air. The metal is heated to an exceedingly elevated
temperature, above its recrystallisation point. When the metal’s
crystalline structures are deformed, it leads to a much lighter,
harder, and stronger version of metals. It leads to the crystalline
structure changing to austenite (non-magnetic phase of iron).
Water quenching is the most aggressive and provides the
fastest cooling rate. This leads to the material becoming
extremely hard but poses risks to cracks or distortion. Oil
quenching is slower; however, it poses less risk to cracks. It is
often used for alloy steels, such as stainless steel. Gas/air
quenching is the slowest form of quenching as it cools metals in
inert gases, such as nitrogen and noble gases. This method
gives high toughness but is less hard than the other methods.
Overall, quenching is mainly used for hardening and toughening
certain metals, to carry out specific functions in a job.
Hardening – The metal is heated to a specific temperature.
Once it has reached this desired temperature, it is quenched in
either oil or water (which are both faster than doing it in air or
gas). Doing this ensures that the crystalline structure of the
metal does not change. It will eventually leave you with a hard,
yet brittle metal.
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 JAD78. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $4.56. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
61001 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now