Arrange the following in terms of increasing severity of quench
P. Oil quenching
Q. Water quenching
R. Water quenching with agitation
S. Brine quenching
Which one of the following does not improve fatigue life of a steel component?
As per the TTT diagram, bainite will form in eutectoid plain carbon steel when heated to 8500C followed by
Match the heat treatment processes of steels in Group-1 with the microstructural features in Group-2:
3. Intermetallic precipitates
4. Epsilon carbide
During carburising, carbon is introduced to form a layer of high carbon at the surface, The carbon is introduced in the form of
Carburizing is the most widely method of surface hardening. The surface layers of a low carbon steel (C ≤ 0.2%) is enriched with carbon up to 0.8 - 1 %. The source of carbon may be a solid , liquid or gas medium. In all cases, the carbon enters the steel at the surface-and diffuse into the steel as a function of time at an elevated temperature.
Maximum surface hardness is attained by
Maximum surface hardness is produced by nitriding; next come cyaniding and carburising.
Select the WRONG statement:
Select the wrong statement:
In nitriding, only nitrogen is used.
The following structure is obtained by Austempering process of heat treatment
Bainite is produced by austempering process. In this process sample is heated and quenched to room temperature below the nose of T-T-T diagram and this temperature is maintained for a substantial period of time so that cooling curve enters into T-T-T diagram.