Diagrama de Fases Hierro Carbono Desde Cero |Ciencia de Materiales| - Salvador FI
Metalurgia: Diagrama de Fases Hierro-Carbono
In this video, the presenter discusses the phases and classifications in the iron-carbon phase diagram based on carbon composition percentages.
Classification Based on Carbon Percentage
- Carbon content below 2% results in steels, while above 2% leads to cast irons.
- For a carbon composition of 0.77%, it falls under tectoid steels.
- Steel with carbon content between 0.77% and 2% is classified as pearlitic steel.
Phases in Iron-Carbon Diagram
- Phase gamma (austenite) can have up to 2.11% carbon and exists between 727°C and 1495°C.
- Phase alpha (ferrite) has a maximum of 0.022% carbon and is softer than austenite.
- Cementite (iron carbide) is hard and brittle due to high carbon concentration at 6.70%.
Fases Presentes en el Diagrama Hierro-Carbono
The discussion continues with phases like perlite, describing their compositions and characteristics within the iron-carbon diagram.
Perlite Composition and Structure
- Perlite consists of ferrite and cementite layers, not considered a single phase but two distinct ones.
- Perlite formation involves alternating layers of ferrite and cementite within the iron-carbon diagram.
Reacciones Invariantes en el Diagrama de Fases
Exploring invariant reactions by analyzing horizontal lines representing phase transformations in the iron-carbon diagram.
Invariant Reactions Analysis
- Identification of delta phase above 1394°C with a maximum carbon composition of 0.08%.
- Presence of liquid phase below delta phase indicates liquid + delta region in the diagram.
New Section
In this section, the speaker discusses the phases gamma and alpha plus iron 3 carbon in a phase diagram related to iron-carbon composition.
Phases Gamma and Alpha Plus Iron 3 Carbon
- The upper part of the diagram represents the gamma or austenite phase, while below the horizontal line is the composition of alpha plus iron 3 carbon, known as perlite.
- Transitioning from a region with a single solid phase to one with two solid phases results in an invariant reaction from gamma to alpha plus iron 3 carbon.
- Moving from a liquid phase to a region with two solid phases leads to an invariant reaction of eutectoid type involving gamma plus iron 3 carbon.
New Section
This section delves into the transition from a liquid phase to regions containing two solid phases in the iron-carbon phase diagram.
Liquid Phase Transition to Two Solid Phases
- The presence of a liquid phase is depicted at the top of the diagram, contrasting with a region below showing two phases: gamma plus iron 3 carbon.