Tempering and stabilization, Mechanical Engineering

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.

Posted Date: 2/26/2013 6:45:54 AM | Location : United States

Related Discussions:- Tempering and stabilization, Assignment Help, Ask Question on Tempering and stabilization, Get Answer, Expert's Help, Tempering and stabilization Discussions

Write discussion on Tempering and stabilization
Your posts are moderated
Related Questions
Draw bending moment diagram for the beam: A cantilever beam carries a uniformly distributed load of 2 t/m over the total length of 6 m and point loads of 5 t, 3 t, 7 t & 2 t a

A fenced enclosure consists of a rectangle of length L and width 2R, and a semicircle of radius R, as shown in Figure P20. The enclosure is to be built to have an area A of 1600 ft

Q. Application of cold service insulation? Cold insulation shall be installed specifically in accordance with the Manufacturer's recommendations, and generally as outlined belo

Q. Firing Rate Demand for Steam Generator? The firing rate for each Steam Generator is proportional to the feedwater flowing into that Steam Generator. Thus, the sum of the pa

Determine modulus of resilience: A steel specimen of 10 mm diameter & 50 mm gauge length was tested in tension and following observations were recorded. Load at upper yield

Explain action and reaction of force: Two bodies A and B are in contact at point ' O '. Body A Press against body B. Thus action of body A on the body B is F . React

Determine the fatigue strength of medium carbon steel: For determining the fatigue strength of medium carbon steel 15 specimens, identical in all respect were tested in cantil

What is the difference between counter flow and parallel flow Heat exchange. Classify Heat exchange on the basis of constructional features and design.

in concept of continum what is the meaning of upper cure

hardness of bore well water is less than sea water .justify