slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Chapter 14 PowerPoint Presentation
Download Presentation
Chapter 14

Loading in 2 Seconds...

play fullscreen
1 / 21

Chapter 14 - PowerPoint PPT Presentation


  • 172 Views
  • Uploaded on

Chapter 14. Heat Treatment of Steels. Austenitizing , Quenching, and Tempering • Annealing • Case Hardening • Component Design and Fabrication. Excessively high austenitizing temperatures lead to grain coarsening and loss of toughness.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Chapter 14' - faxon


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
chapter 14

Chapter 14

Heat Treatment of Steels

Austenitizing, Quenching, and Tempering • Annealing • Case Hardening • Component Design and Fabrication

slide4
Burning leads to permanent damage caused by intergranular oxidation or incipient melting along the grain boundaries of the steel.
slide6
The severity of quench for a quenching medium must exceed the value required to achieve the minimum allowable hardenability in a steel.
slide7
The outer layers of the component transform first and are placed in tension, whereas the inner layers transform last and are placed in compression. With severe quenching, this leads to quench cracking.
slide8
At any tempering temperature, a specific maximum amount of residual stress can be removed up to a maximum value.
slide9
Tempering takes place in three stages that overlap one another as the temperature is raised.
slide10
Austemperingconsists of austenitizinga steel, quenching it into a suitable medium maintained at a temperature in the bainite transformation range, and cooling it in air.
slide11
After martempering, the component must be conventionally tempered in order to restore toughness.
slide12
The key differences between annealing and normalizing are the holding temperatures and the rates of cooling.
slide13
Process annealing of a cold-worked steel causes recrystallization and evolution of fine equiaxed grains.
slide14
The majority of the stress relief is obtained after approximately 2 hr at any temperature.
slide16
Higher carburizing temperatures or longer holding times at the carburizing temperature result in a deeper carbon-enriched case.
slide17
In conventional nitriding processes, the surface consists of a very thin, white layer and a deeper diffusion zone.
slide18
Induction hardening is dependent on the frequency of the current and the shape of coils used to produce the current.
slide19
During induction hardening, the component is immediately quenched using special designs that incorporate quenching into the equipment.
slide21
Machining and grinding operations must be carefully controlled because residual stresses, which lead to cracking before or during heat treatment, will be produced.