Post on 14-Apr-2018
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Engineering properties are modified by heat treatment processes so that structural components are able withstand specified
operating conditions and have desired useful life.
Heat treatment is the heating and cooling of metals to change their physical and mechanical properties, without
letting it change its shape. Heat treatment could be said to be a method for
strengthening materials but could also be used to alter some mechanical properties such as improving formability,
machining, etc. The most common application is metallurgical but heat treatment can also be used in manufacture
of glass, aluminum, steel and many more materials. The process of heat treatment involves the use of heating or
cooling, usually to extreme temperatures to achieve the wanted result. It is very important manufacturing processes
that can not only help manufacturing process but can also improve product, its performance, and its characteristicsin many ways.
Heat Treatment ProcessesHardening
Hardening involves heating of steel, keeping it at an appropriate temperature until all pearlite is transformed into austenite,
and then quenching it rapidly in water or oil. The temperature at which austentizing rapidly takes place depends upon the
carbon content in the steel used. The heating time should be increased ensuring that the core will also be fully transformed
into austenite. The microstructure of a hardened steel part is ferrite, martensite, or cementite.
Tempering
Tempering involves heating steel that has been quenched and hardened for an adequate period of time so that the metal can
be equilibrated. The hardness and strength obtained depend upon the temperature at which tempering is carried out. Higher
temperatures will result into high ductility, but low strength and hardness. Low tempering temperatures will produce low
ductility, but high strength and hardness. In practice, appropriate tempering temperatures are selected that will produce the
desired level of hardness and strength. This operation is performed on all carbon steels that have been hardened, in order to
reduce their brittleness, so that they can be used effectively in desired applications.
Annealing
Annealing involves treating steel up to a high temperature, and then cooling it very slowly to room temperature, so that the
resulting microstructure will possess high ductility and toughness, but low hardness. Annealing is performed by heating a
component to the appropriate temperature, soaking it at that temperature, and then shutting off the furnace while the piece is
in it. Steel is annealed before being processed by cold forming, to reduce the requirements of load and energy, and to enable
the metal to undergo large strains without failure.Normalizing
Normalizing involves heating steel, and then keeping it at that temperature for a period of time, and then cooling it in air.
The resulting microstructure is a mixture of ferrite and cementite which has a higher strength and hardness, but lower
ductility. Normalizing is performed on structures and structural components that will be subjected to machining, because it
improves the machinability of carbon steels.
Carburization
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It is a heat treatment process in which steel or iron is heated to a temperature, below the melting point, in the presence of a
liquid, solid, or gaseous material which decomposes so as to release carbon when heated to
the temperature used. The outer case or surface will have higher carbon content than the primary material. When the steel or
iron is rapidly cooled by quenching, the higher carbon content on the outer surface becomes hard, while the core remains
tough and soft.
Surface Hardening
In many engineering applications, it is necessary to have the surface of the component hard enough to resist wear and
erosion, while maintaining ductility and toughness, to withstand impact and shock loading. This can be achieved by local
austentitizing and quenching, and diffusion of hardening elements like carbon or nitrogen into the surface. Processes
involved for this purpose are known as flame hardening, induction hardening, nitriding and carbonitriding.