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The iron-carbon phase diagram

On the left-hand side of the diagram, the forms of pure iron are indicated. Pure iron has a melting point of 1538 °C. Below the melting point, pure iron adopts one of three different crystal stmctures [Pg.102]

Between the pure iron allotropes and the intermediate phase cementite, a number of solid solution regions occur. The extent of these depends on the [Pg.102]


Figure 6.3 The iron-carbon phase diagram showing the alternative production of iron and cementite from the liquid alloy, which occurs in practice, to the equilibrium production of graphite... Figure 6.3 The iron-carbon phase diagram showing the alternative production of iron and cementite from the liquid alloy, which occurs in practice, to the equilibrium production of graphite...
Fig. 11.1. The left-hand part of the iron-carbon phase diagram. There ore five phases in the Fe-FejC system L, 5, y, or and Fe3C (see Table 1 1.1). Fig. 11.1. The left-hand part of the iron-carbon phase diagram. There ore five phases in the Fe-FejC system L, 5, y, or and Fe3C (see Table 1 1.1).
Figure A1.37 shows the iron-carbon phase diagram up to 6.7 wt% carbon (to the first intermetallic compound, FejC). Of all the phase diagrams you, as an engineer, will encounter, this is the most important. So much so that you simply have to learn the names of the phases, and the approximate regimes of composition and temperature they occupy. The phases are ... Figure A1.37 shows the iron-carbon phase diagram up to 6.7 wt% carbon (to the first intermetallic compound, FejC). Of all the phase diagrams you, as an engineer, will encounter, this is the most important. So much so that you simply have to learn the names of the phases, and the approximate regimes of composition and temperature they occupy. The phases are ...
The polymorphism of certain metals, iron the most important, was after centuries of study perceived to be the key to the hardening of steel. In the process of studying iron polymorphism, several decades were devoted to a red herring, as it proved this was the P-iron controversy. P-iron was for a long time regarded as a phase distinct from at-iron (Smith 1965) but eventually found to be merely the ferromagnetic form of ot-iron thus the supposed transition from P to a-iron was simply the Curie temperature, p-iron has disappeared from the iron-carbon phase diagram and all transformations are between a and y. [Pg.99]

Cast irons, although common, are in fact quite complex alloys. The iron-carbon phase diagram exhibits a eutectic reaction at 1 420 K and 4-3 wt.<7oC see Fig. 20.44). One product of this eutectic reaction is always austenite however, depending on the cooling rate and the composition of the alloy, the other product may be cementite or graphite. The graphite may be in the form of flakes which are all interconnected (although they appear separate on a... [Pg.48]

Stable and metastable iron-carbon phase diagram. The behaviour of iron and iron alloys depends on the existence of its different forms and on their transformations technologically moreover the carbon content is crucial. These aspects are clearly shown in the iron-carbon phase diagram, especially in the low... [Pg.452]

The iron-carbon phase diagram at low weight percentages of carbon is shown in Figure 2.8. Actually, the phase boundary at 6.69 wt% carbon represents the compound iron carbide, FesC, known as cementite, so that the phase diagram in Figure 2.8 is more appropriately that of FesC-C. [Pg.160]

Figure 2. The iron-carbon phase diagram (part), with the dissolution and precipitation regions used in this work. Key ---, Fe-cementite and-----, Fe-graphite. Figure 2. The iron-carbon phase diagram (part), with the dissolution and precipitation regions used in this work. Key ---, Fe-cementite and-----, Fe-graphite.
With respect to the iron-carbon phase diagram (Figure 4.16 page 102) ... [Pg.255]

Main crystalline constituents in carbon steels are ferrite, cementite, perlite, and, depending on heat treatment, bainite and martensite. Below approximately 723 °C, austenite in carbon steels is transformed into perlite and, according to the carbon content, ferrite or cementite. Thus, austenite is only present at room temperature in alloyed steels and not in carbon steels. The iron-carbon phase diagram shows the metallographic constitution for unalloyed carbon steels depending on the carbon content and the temperature. Fig. 2. [Pg.777]

The iron-carbon phase diagram only applies to alloys that contain only iron and carbon. But because other desired or undesired alloying elements are usually originally present from... [Pg.77]

A portion of the iron-carbon phase diagram is presented in Figme 9.24. Pure iron, upon heating, experiences two changes in crystal structure before it melts. At room temperature, the stable form, called ferrite, or a-iron, has a BCC crystal structure. Ferrite experiences a polymorphic transformation to FCC austenite, or y-iron, at 912°C (1674°F). This austenite persists to 1394°C (2541°F), at which temperature the FCC austenite reverts back to a BCC phase known as 5-ferrite, which finally melts... [Pg.333]

Figure 11.5 From the iron-carbon phase diagram, composition ranges for commercial cast irons. Also shown are schematic microstructures that result from a variety of heat treatments. Gf, flake graphite G graphite rosettes G , graphite nodules P, pearlite , ferrite. Figure 11.5 From the iron-carbon phase diagram, composition ranges for commercial cast irons. Also shown are schematic microstructures that result from a variety of heat treatments. Gf, flake graphite G graphite rosettes G , graphite nodules P, pearlite , ferrite.

See other pages where The iron-carbon phase diagram is mentioned: [Pg.411]    [Pg.211]    [Pg.211]    [Pg.135]    [Pg.159]    [Pg.160]    [Pg.110]    [Pg.411]    [Pg.110]    [Pg.10]    [Pg.513]    [Pg.101]    [Pg.101]    [Pg.107]    [Pg.123]    [Pg.74]    [Pg.76]    [Pg.78]   


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Iron carbonate

Iron diagrams

Iron phase diagrams

Iron-carbon

Iron-carbon phase

Iron-carbon phase diagram

Phase carbon

Phase diagram carbon

The carbonate phase

The diagram

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