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heat treatment for engineering materials microlesson

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by

Owen Parkes

on 27 November 2014

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Transcript of heat treatment for engineering materials microlesson

Heat Treatment
Quenching
Effects of heat on steel
heat treatment of steel
Summary
used in cutting tools and high strength applications
quenching hardens steel
annealing,tempering and normalizing soften steel
normalizing is low cost
annealing is more precise
tempering
temperature differ with carbon content
727 recrystallization temperature
harden a material
hardening reduces ductility
harden doesn't change stiffness
different crystal have different names (phases)
heated above recrystallization temperature (727C)
rapid cooling of specimen in oil water or brine quenching mediums
needle like structure known as martensite forms
steel looses its magnetic properties when in austentitic structure
Tempering
Annealing
Normalizing
Heated to 50 above recrystallization temperature cooled in atmospheric conditions

To refine the grain structure
To encourage reduced grain segregation in castings and forgings and provide a more uniform structure
harder material than annealing
cheaper than annealing as room temperature cooling
Recap on structures
Further Reading
ILO's
Understand temperatures
Understand grain structure and how it effects properties
Know what type of heat treatment to apply
Retain 60% of knowledge
immediately after quenching heating part to temperature and holding for 2 hours

warm the steel below the recrystallization temperature
increase ductility and toughness

150-250C relieves stresses
450-700C Softens material
heated to 60 above recrystallization temperature
Annealing is reheating steel followed by slow cooling.

It is completed
to remove internal stress or to soften or
to refine the crystalline structure
increases ductility and toughness
uses ovens and sand to control cooling
http://www.roymech.co.uk/Useful_Tables/Matter/Hardening.html
http://www.brighthubengineering.com/manufacturing-technology/74097-heat-treatment-annealing-and-tempering/
cnc
http://www.mmsonline.com/articles/key-cnc-concept-1the-fundamentals-of-cnc
Quiz
Check knowledge and have some fun

http://www.classtools.net/mob/quiz_58/heat_treatment_of_steel_sWCIu.htm
Quiz
Question 1
Question 2
Question 3
Question 4
Question 5
Full transcript