Heat Treatment

                                       Heat Treatment 

Definition

heat treatment is the stage in the fabrication of structures and is often forgotten but it has perhaps make w wide-reaching and important ramifications that many of the others stage in the fabrications of structure or components.

classification of the heat treatment process

the various heat treatment process can be classified:-

1.annealing
2.stress relief annealing
3.process annealing
4.spheroidising annealing
5.fall annealing
6.normalizing
7.Harding
8.tempering
9.nor tempering
10.austempering

purpose of heat treatment

1.cause relief of internal stress develop during cold working welding casting forging etc
2.hardens and strengthen metals
3.change grain size
4.soften metals for further
5.improve ductility and toughness
6.increase heat wear and magnetic properties
7.homogenize the structures to remove caring pr segregation
8.spheroidize they particles such as those of fe3c in steel by diffusion

principal fundaments of heat treatment

1.steel treatments are made possible by the reaction in the iron-carbon system.

2.all basic heat-treating process for steel involves the transformation of austenite the nature and appearance of thus obtained transformation product development of a variety of useful physical or mechanical properties in stress.

3.cooling rate plays an important role in the transformation of austenite to pearlite or martensite.

4.heat treatment is effective only with certain alloys because it depends upon one element being soluble in other in right solid-state in different amounts under different circumstances.

5.the theory of heat treatment is based on the principle that an alloy experience changes in the structure when heated above a certain temperature and it undergoes gain a change in structure when coded to room temperature cooling rate is an important factor in developing different soft or hard structures.