Interesting Research on Fabrication – What You Didn’t Know

Everything About Heat Treatment

When a material’s physical or chemical property is altered especially in industrial and metalworking processes, this is automatically referred to as heat treating or heat treatment. Metallurgical is the most common application. Heat treatments are used in the manufacturing of different materials similar to glass.

Heat treating involves the usage of chilling or heating, typically to the extreme temperature to be able to attain the desired result like softening or hardening of a material. Techniques used in heat treatment are plentiful including case hardening, annealing, precipitation strengthening, quenching, normalizing and tempering. It is also noteworthy that while such term is applicable to processes where cooling and heating are done for a specific purpose of intentionally modifying properties, the cooling and the heating usually take place incidentally throughout other manufacturing procedures such as welding or hot forming.

Metallic materials consist of microstructure of small crystals also known as crystallites or grains. One of the most effective aspects to figure out the mechanical behavior of metal is seeing the nature of grains similar to its size or composition. Heat treatment is providing an effective way of manipulating metal properties by controlling the diffusion rate as well as cooling rate within microstructure. Most of the time, heat treatment is used to modify mechanical properties of metallic alloy, manipulating properties including toughness, strength, hardness, elasticity and ductility.

There are 2 mechanisms that might change the properties of alloy throughout heat treating and it is the formation of martensite causes crystals to deform intrinsically and diffusion mechanism that makes the changes in the alloy’s homogeneity.

The structure of crystal includes atoms that are grouped in a particular arrangement that is referred as lattice. In many different elements, this order rearranges itself depending on conditions such as pressure and temperature. As a matter of fact, this said rearrangement is known scientifically as polymorphism or allotropy that can actually happen multiple times at different temperatures for certain metal types. Now in alloys, this rearrangement can result to an element that will not normally dissolve into base metal to be soluble while reversal of allotropy can make the element completely or partially insoluble.

And while it is in a soluble state, the process of diffusion would make the dissolved atoms to spread out as it forms homogenous distribution within the base metal’s crystals. Now, when the alloy is cooled to insoluble state, the constituents of the dissolved atoms will move out of the solution. This diffusion is known as precipitation, leading to nucleation where all migrating atoms regroup together at grain boundaries. This will create 2 or several distinctive phases when it forms into microstructure.

A Beginners Guide To Fabrication

A Beginners Guide To Fabrication