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3945324
Microstructure Constituents
Description
Microstructures
No tags specified
austenite
martinsite
pearlite
bainite
steel
material selection
hnc
Mind Map by
Billie Juniper
, updated more than 1 year ago
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Created by
Billie Juniper
about 9 years ago
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Resource summary
Microstructure Constituents
Austenite
Face-Centred Cubic
In Iron-Carbon Alloys
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
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
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
Lower Bainite
Forms between 400°C and 250°C
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
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