Wrought Alloys Notes

Wrought Alloys Important Notes

  1. Stainless Steel.
  • Austenitic stainless steel
  • Use – To make orthodontic archwires

Stainless Steel Properties:

  • Adequate strength
  • Adequate spring back
  • Resilience
  • Formability
  • Biocompatible
  • Economical

2. Alloys and their constituents

  • Elgiloy-cobalt-chromium-nickel
  • Beta titanium – titanium – molybdenum – aluminum
  • Nitinol-nickel-titanium
  • Titanium alloys – titanium – aluminum – vanadium

Wrought Alloys

Wrought Alloys Short Essays

Question 1. Ni-Ti orthodontic wire.

Ni-Ti orthodontic wire

  • Synonym – Nitinol (Nickel Titanium Naval Ordinance Laboratory)
  • Inventor – William R. Buchler
  • Introduced by – Andersen in 1971

Nickel Titanium Alloy Properties:

  • Super elasticity
  • Shape memory
  • High spring back
  • High working range
  • Low stiffness

Ni-Ti orthodontic wire Advantages or Nickel Titanium Alloy Properties:

Produce low and more constant force on teeth

Ni-Ti orthodontic wire Disadvantages or Nickel Titanium Alloy Properties:

  • Cannot be bent

Read And Learn More: Dental Materials Question and Answers

  • Cannot be soldered or welded

Question 2. Types of Stainless Steel.

Types of Stainless Steel

  • Types of stainless steel are
  • Ferritic stainless steel
  • Austenitic stainless steel
  • Martensitic stainless steel

Sensitization Of Stainless Steel

Wrought Alloys Types Of Stainless Steel

Wrought Alloys Short Question And Answers

Question 1. Stages of annealing heat treatment.

Stages of annealing heat treatment

Wrought Alloys Stages Of Annealing Heat Treatment

Question 2. Zones of flame.

Zones of flame

Wrought Alloys Zones Of Flame

Question 3. Sensitization of 18-8 stainless steel.

Sensitization of 18-8 stainless steel

  • At 400-900°C, stainless steel resist corrosion and tarnish
  • At lower temperatures, carbon reacts with the surface granules and forms chromium iron carbide causing tarnish and corrosion
  • This can be prevented by decreasing carbon content or by cold working of stainless steel

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