10 Important differences between Cold working and Hot working

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Following are the 10 important differences between cold working and hot working Working of metal and alloy below their recrystallization temperature is known as cold working , and working of metal and alloy above their recrystallization temperature is known as hot working . During cold working strain hardening occurs and due to this tensile strength, hardness increases while the impact strength and ductility decreases, whereas, due to hot working strain hardening is removed by recrystallization. Microstructure of cold worked component shows distorted grains, whereas, microstructure of hot worked components shows equiaxed and usually refined grains. Due to cold working defect density increases i.e. vacancies, dislocations, etc. increases and hence the density of material slightly decreases, whereas, due to hot working there is almost no change in defect density of material. Cold working cannot be done indefinitely without cracking of material due to strain hardening, whereas, ho
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DIFFUSION TYPES


TYPES OF DIFFUSION:


Hello Everyone!
In this blog, we are going to discuss different types of diffusion, instead, we can also call it different types of mechanism by which diffusion occurs.

Basis of classification:

Diffusion is classified based on the type of site occupied by the atoms.
Substitutional diffusion occupies vacant sites.
Interstitial diffusion occupies the interstitial space between the atoms.

Types of mechanisms of diffusion:

There are two mechanisms by which diffusion takes place:
  1. Substitutional diffusion.
  2. Interstitial diffusion.

Explanation:

  1. Substitutional diffusion: Substitutional diffusion mainly occurs due to the migration of atoms to the neighboring vacancy site i.e. by vacancy migration mechanism.
  2. Interstitial diffusion: Interstitial diffusion occurs due to jumping of atoms to the neighboring interstitial site. The mechanism basically comprises an atom pushing or forcing through larger atoms making its way to the interstitial site.

a)Interstitial diffusion
b)Substitutional diffusion


















What do you want to know more about diffusion?
Please feel free to ask questions in the comments!!!




















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