Induction hardening Faridabad is
a form of heat treatment in which a metal part is heated by induction heating
and then quenched. The quenched metal undergoes a martensitic transformation,
increasing the hardness and brittleness of the part. Induction hardening is
used to selectively harden areas of a part or assembly without affecting the
properties of the part as a whole.
Process Edit
Induction heating is a non
contact heating process which utilizes the principle of electromagnetic
induction to produce heat inside the surface layer of a work-piece. By placing
a conductive material into a strong alternating magnetic field, electric
current can be made to flow in the material thereby creating heat due to the
I2R losses in the material. In magnetic materials, further heat is generated
below the Curie point due to hysteresis losses. The current generated flows
predominantly in the surface layer, the depth of this layer being dictated by
the frequency of the alternating field, the surface power density, the
permeability of the material, the heat time and the diameter of the bar or
material thickness. By quenching this heated layer in water, oil, or a polymer
based quench, the surface layer is altered to form a martensitic structure
which is harder than the base metal.
Definition Edit
A widely used process of the
surface hardening of steel. The components are heated by means of an
alternating magnetic field to a temperature within or above the transformation
range followed by immediate quenching. The core of the component remains
unaffected by the treatment and its physical properties are those of the bar
from which it was machined, whilst the hardness of the case can be within the range
37/58 HRC. Carbon and alloy steels with equivalent carbon content in the range
0.40/0.45% are most suitable for this process.
A source of high frequency
electricity is used to drive a large alternating current through a coil. The
passage of current through this coil generates a very intense and rapidly
changing magnetic field in the space within the work coil. The work piece to be
heated is placed within this intense alternating magnetic field where eddy
currents are generated within the work piece and resistance leads to Joule
heating of the metal of oil
coolers in Faridabad.
This operation is most commonly
used in steel alloys. Many mechanical parts, such as shafts, gears, and
springs, are subjected to surface treatments, before the delivering, in order
to improve wear behavior. The effectiveness of these treatments depends both on
surface materials properties modification and on the introduction of residual
stress. Among these treatments, induction hardening is one of the most widely
employed to improve component durability. It determines in the work-piece a
tough core with tensile residual stresses and a hard surface layer with
compressive stress, which have proved to be very effective in extending the
component fatigue life and wear resistance.
Induction surface hardened low
alloyed medium carbon steels are widely used for critical automotive and
machine applications which require high wear resistance. Wear resistance
behavior of induction hardened parts depend on hardening depth and the
magnitude and distribution of residual compressive stress in the surface layer
of Case Hardening in Faridabad.
History Edit
The basis of all induction
heating systems was discovered in 1831 by Michael Faraday. Faraday proved that
by winding two coils of wire around a common magnetic core it was possible to
create a momentary electromotive force in the second winding by switching the
electric current in the first winding on and off. He further observed that if
the current was kept constant, no EMF was induced in the second winding and
that this current flowed in opposite directions subject to whether the current
was increasing or decreasing in the circuit.
Faraday concluded that an
electric current can be produced by a changing magnetic field. As there was no
physical connection.
