Steel_Part_1

Steel_Part_1 - Steels: Part 1 The Iron-Carbon Equilibrium...

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Steels: Part 1
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The Iron-Carbon Equilibrium Phase Diagram
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Single Phases in the Equilibrium Diagram : Liquid Alpha -- Ferrite (the iron structure) Maximum solubility of carbon is only 0.0218%C Delta --- δ —ferrite Note: α & δ are both the BCC crystal stucture form of iron Gamma -- Austenite (Austen’s structure) Note: This is the elevated temp FCC form of iron which can hold up to 2.11% Carbon Fe 3 C -- Cementite (the cement structure) Note: This is a stoichiometric intermetallic compound—hard and brittle
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Three-phase reactions in the Iron-Carbon Equilibrium Diagram: 1). Peritectic: δ + L γ Occurs at very high temperature Followed by large expanse of cooling before any further change Reasonable to assume completion Therefore, largely ignored We will begin our consideration of steel structure with γ phase rather than liquid
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Three-phase reactions: 2). Eutectic: L γ + Fe 3 C Occurs for alloys with more than 2.11%
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This note was uploaded on 05/20/2008 for the course MET 121 taught by Professor Kohser during the Spring '07 term at Missouri S&T.

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Steel_Part_1 - Steels: Part 1 The Iron-Carbon Equilibrium...

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