Metallurgy Glossary

Timeline of materials technology

BC

  • 29,000–25,000 BC – First pottery appears
  • 3rd millennium BC – Copper metallurgy is invented and copper is used for ornamentation
  • 2nd millennium BC – Bronze is used for weapons and armour
  • 1st millennium BC – Pewter beginning to be used in China and Egypt
Making pottery
  • 16th century BC – The Hittites develop crude iron metallurgy
  • 13th century BC – Invention of steel when iron and charcoal are combined properly
  • 10th century BC – Glass production begins in ancient Near East

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Austenite (Gamma Iron)

 

Austenite, also known as gamma phase iron is a metallic non-magnetic allotrope of iron or a solid solution of iron, with an alloying element. In plain-carbon steel, austenite exists above the critical eutectoid temperature of 1,000 K (1,340 °F); other alloys of steel have different eutectoid temperatures. It is named after Sir William Chandler Roberts-Austen (1843–1902).

316 austenitic stainless steel, containing sigma phase. Source : http://www.paintertoolinc.com/

Austenite is a metallic, non-magnetic solid solution of carbon and iron that exists in steel above the critical temperature of 1333°F ( 723°C). Its face-centred cubic (FCC) structure allows it to hold a high proportion of carbon in solution. In many magnetic alloys, the Curie point, the temperature at which magnetic materials cease to behave magnetically, occurs at nearly the same temperature as the austenite transformation. This behavior is attributed to the paramagnetic nature of austenite, while both martensite and ferrite are strongly ferromagnetic.

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Types of Materials

 

Metals:

Metals are elements that generally have good electrical and thermal conductivity.Many metals have high strength, high stiffness, and have good ductility. Some metals, such as iron, cobalt and nickel are magnetic.At extremely low temperatures, some metals and intermetallic compounds become superconductors.

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The Casting Process Pictures

These are the metallurgy pictures jobs and activities in the Metal Casting. There are very hot but interesting. This is the real pretty hot job !

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