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Description
Mind Map by Billie Juniper, updated more than 1 year ago
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Created by Billie Juniper
over 8 years ago
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Microstructure Constituents
- Austenite
- Face-Centred Cubic
- In Iron-Carbon Alloys
- Evident between 723°C and 1500°C
- Evident between 723°C and 1500°C
- Can be Retained at Room Temperature by
Alloy Additions Such as Nickel or Manganese
- Former by Cooling from a Liquid State
- Face-Centred Cubic
- Martensite
- Formed when Cooling Rate from
Austenite is Sufficiently Fast
- Very Hard Constituent due to the Carbon
which is Trapped in the Solid Solution
- Occurs by Sudden Diffusionless Shear Process
- Term not limited to steel
- Formed when Cooling Rate from
Austenite is Sufficiently Fast
- Bainite
- Formed at cooling rates slower than that for martensite
formation but faster than that for ferrite and pearlite formation
- Two Forms
- Upper Bainite
- Forms between 550°C and 400°C
- Forms between 550°C and 400°C
- Lower Bainite
- Forms between 400°C and 250°C
- Forms between 400°C and 250°C
- Upper Bainite
- Formed at cooling rates slower than that for martensite
formation but faster than that for ferrite and pearlite formation
- Pearlite
- Formed During the Slow Cooling of Iron Alloys
- Can Begin at a Temperature of 1150°C to 723°C
Depending on the Composition of the Alloy
- Formed by Eutectoid Decomposition of Austenite Upon Cooling by
Diffusing of C Atoms when Ferrite and Cementite Grow Continuously
- Formed During the Slow Cooling of Iron Alloys
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