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Anonymous users2024-02-07First, the characteristics are different.
1. Pearlite: its mechanical properties are between ferrite and cementite, that is, its strength and hardness are significantly higher than ferrite, and its plasticity and toughness are worse than ferrite, but much better than cementite.
2. Austenite: austenite has good plasticity, low strength, certain toughness, and no ferromagnetism. Because austenite is face-centered cube, the octahedral gap is larger, which can hold more carbon.
Second, the appearance characteristics are different.
1. Pearlite: its form is a layered complex with alternating layers of ferrite and cementite thin layers, also known as flake pearlite.
2. Austenite: polygonal grains in the form of equiaxes.
Third, the reasons for the formation are different.
1. Pearlite: the spacing between the sheets decreases with the decrease of transition temperature; The reciprocal of the slice spacing was linearly positively correlated with the degree of supercooling. The fineness of the sheet spacing is limited by the driving force that may be obtained.
2. Austenite: The thermodynamic condition for the formation of austenite is that there must be a supercooling degree or superheat t.
Encyclopedia - Austenite.
Encyclopedia - Pearlite.
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Anonymous users2024-02-06There are three main types of microstructures of steel at room temperature:
Ferrite: the solid solution of ferrite carbon in -fe in steel, due to the small interatomic void of the -fe body-centered cubic lattice, the carbon dissolving ability is poor, so the ferrite has very little carbon content (less than, which determines its plasticity and toughness; However, the strength and hardness are low.
Cementite: Cementite is Fe3C, a compound of iron and carbon, with high carbon content, complex crystal structure, poor plasticity, hard and brittleness, and low tensile strength.
Pearlite: Pearlite is a mechanical mixture of ferrite and cementite, with low carbon content (, layered structure, good plasticity, high strength and hardness.
In addition, austenite is present in steel at temperatures above 723. Austenite is a solid solution of carbon in -Fe, which has a strong ability to dissolve carbon, and the carbon content can reach at high temperature, and drop to low temperature. Its strength and hardness are not high, but its plasticity is good.
This structure exists when carbon steel is in a red-hot state, when the steel is easy to roll into shape.
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Anonymous users2024-02-05They are all metallographic organizations:
1.Austenite: An interstitial solid solution of carbon in -fe (iron with a face-centered cubic structure).
2.Ferrite: An interstitial solid solution of carbon in -fe (iron in a body-centered cubic structure).
3.Ledeshite: A mechanical mixture of cementite and austenite (containing carbon.
4.Pearlite: a mechanical mixture composed of ferrite and cementite (F+FE3C carbon-containing ferrite, austenite has good plasticity and toughness, and pearlite has high comprehensive mechanical properties; Ledestraite is brittle, has high hardness, and has good wear resistance.
The process of heating and insulating the steel in a certain way in a certain way in a solid state, and then cooling it in a suitable way can obtain the required structure and properties.
This is a science, it is difficult to explain it in one or two sentences, it is recommended to check the relevant metallographic information.
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Anonymous users2024-02-04Pearlite is a mechanical mixture formed by cementite and ferrite; Ledeite is a mechanical mixture formed by pearlite and cementite; Ferrite is a solid solution of carbon in -Fe; Austenite is a solid solution of carbon in -Fe.
The main difference is that the forms of presence in iron-carbon alloys are different, the structure of pearlite and leasite belongs to mechanical mixtures, while the structure of ferrite and austenite belongs to solid solutions.
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Anonymous users2024-02-03The transformation from austenite to pearlite is a changju (nai zheng rang).
a.Eutectic transformation.
b.Eutectic clear group transformation.
c.Homogenization transformation.
d.Clad transformation.
Correct Answer: a
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