Tempering and stabilization, Mechanical Engineering

Assignment Help:

Tempering and Stabilization:

Tempering of tool steel in heat treatment is again a significant step. The quenching of such steels reasons the existence of untempered martensite, retained austenite and carbide in the structure. This happen due to finer changes in composition does not permit to found correct austenising temperature. Tempering nears removing such structural deficiencies assist also induce secondary hardness. Following figure shows the secondary hardness presence manifested via increased hardness at specific tempering temperature in the condition of high alloy steels. Both intermediate and high alloy steel reduces in hardness respectively upto about 460oC and 500oC and thereafter they enhance in hardness. High alloy steels illustrate greatest enhance in hardness along with enhancing tempering temperature.

2015_Tempering and Stabilization.png

Figure: Tempering Characteristics of Tool Steels

After tempering primarily the treatment is repeated two or three instance in multi-tempering practice. That treatment stabilizes the microstructure via decreases the amount of retained austenite. Still now another stabilization method is to cool the tempered steel to subzero temperature via placing it in solid carbon dioxide (- 75oC) or dipping it in liquid nitrogen (- 196oC).

Normalized quenched, stabilized and tempered tool steel possesses maximum hardness, dimensional stability and wears resistance.


Related Discussions:- Tempering and stabilization

Efficiency test on sand blasting, Efficiency Test on Sand Blasting:   ...

Efficiency Test on Sand Blasting:             After the study on sand blasting, the result was acceptable and the next step is planning to make order for new machine and searc

Explain sulphidation process, Q. Explain Sulphidation process? The pres...

Q. Explain Sulphidation process? The presence of sulphur converts the surface of the metal to a sulphide scale which is generally more destructive than an oxide scale. Sulphid

Matter, Matter, Particle and Weight: Sol: Matter: Matter is anythi...

Matter, Particle and Weight: Sol: Matter: Matter is anything which occupies space and have some mass, offers resistance to any stress, for example Iron, stone, air, Water.

Stitch welding, Stitch welding Here, a series of overlapping spot welds...

Stitch welding Here, a series of overlapping spot welds are made with the spot welding machine using the conventional electrode tip. Both water tight and gas tight joints can b

Gear torque output, what is the different torque rating of a helical gear o...

what is the different torque rating of a helical gear one direction verses the other

Camshaft-basic components of engine , Camshaft : The camshaft controls th...

Camshaft : The camshaft controls the opening and closing of the two valves. The associated parts are push rods, rocker arms and valve springs. The camshaft is driven by a camchai

Petrol-general safety tips , Petrol: Work in a well-ventilated area. Keep ...

Petrol: Work in a well-ventilated area. Keep flames or sparks away from the work area or where petrol is stored.

Drawing, for drawing large size circles diameter greter than 150mm what is...

for drawing large size circles diameter greter than 150mm what is attached to compass? \

Potential energy and kinetic energy- thermodynamics, Potential energy (PE) ...

Potential energy (PE) The energy possessed by body or system by virtue of its position above the datum level. The work done is because of its falling on earth's surface. Po

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd