What is the difference between martensite and austenite?

Martensite. The main differences from austenite are as follows:

1. Different forms.

Martensite is a body-centered square structure, and the three-dimensional tissue morphology is usually flaky or slat-like, and the flaky martensite usually appears as a needle-like in metallographic observation (two-dimensional).

Martensite.

Austenite is a face-centered cubic structure, and interstitial atoms such as carbon and nitrogen are located in the center of the octahedral gap of the austenite unit cell, and the center of the face-centered cubic unit cell and the midpoint of the edge.

Austenite: <>

2. The density is different.

The austenite to martensitic transition requires very little energy, as the transition is of the diffusion-free displacement type, with only rapid and tiny atomic rearrangements. Since the volume expands after transformation, it can be seen that the density of martensite is lower than that of austenite.

3. The characteristics are different.

Martensite has high strength and hardness, but the toughness is very poor, and it is characterized by being hard and brittle;

Austenite has good plasticity, low strength, certain toughness, and no ferromagnetism.

Poor thermal conductivity, coefficient of linear expansion. Big.

Martensite and austenite are both a microstructure form of steel in the heat treatment process, and the code name of austenite is: face-centered cubic structure, interstitial solid solution of carbon in -fe, maximum amount of dissolved carbon. In the process of martensite transformation, only the lattice reconstruction of iron occurs, and the iron and carbon atoms do not diffuse, and no concentration change occurs, and only the face-centered cubic lattice becomes a body-centered cubic lattice, so martensite and austenite have the same chemical composition.

However, because martensite is a supersaturated solid solution of carbon in -fe, it has high strength and hardness. Martensite can be a microstructure of steel at normal room temperature, but austenite is only a microstructure in the heating process, and different microstructures can be obtained by cooling at different rates, not only martensite. Martensite has hardness, whereas austenite has no hardness because it is the form in the hot state. Satisfied.

Austenite is a lamellar microstructure of steel, usually a non-magnetic solid solution with a small amount of carbon in -Fe, also known as Vostenite iron or -Fe.

Martensite is a microstructure name for ferrous metals, which is a supersaturated solid solution of carbon in -Fe.

Differences: austenite has good plasticity, low strength, certain toughness, and no ferromagnetism. Martensite, on the other hand, has high strength, but poor plasticity and weldability.

Austenite is a laminar microstructure of steel, and martensitic is the name of a structure of ferrous metal materials.

Austenite Martensite distinctions are as follows:

Composition. 1. Austenite is generally composed of equiaxed polygonal grains with twin crystals in the grains.

2. There are two types of martensitic tissue. Medium and low carbon steel quenching to obtain lath-shaped martensite, which is composed of many thin slats of roughly the same size and approximately parallel arrangement, and the angle between each bundle of slats is relatively large; High-carbon steel is quenched to obtain acicular martensite, which is in the form of bamboo leaves or convex lenses.

1. What are Wechsitrite, Martensite and Austenite?

Wechsting, martensite, and austenite are different metal microstructures and are the three microstructures often encountered in heat treatment. In the metalworking process, the mechanical properties of the metal can be improved by controlling the temperature and time to change the grain size, shape, and arrangement of the metal.

The following will introduce the characteristics and applications of Weistenite, martensite, and austenite, respectively.

Second, the characteristics of Wei's body and the use of oranges.

Weishalite is a microstructure obtained by the rapid cooling of mild steel after uniform heating, and has the following characteristics:

High hardness and strong wear resistance;

Low plasticity and toughness, prone to cracks;

It is brittle, and it is easy to produce stress concentration and fracture.

Wechsland is widely used in the manufacture of tools such as springs, hammers, hammer handles, and hammer handles, as well as in the manufacture of parts such as high-strength bolts and nuts.

3. Characteristics and applications of martensite.

Martensite is a microstructure obtained by the rapid cooling of high-carbon steel after being heated to a critical temperature, and has the following characteristics:

High hardness and strong wear resistance, but slightly inferior to Wechster;

Good toughness and plasticity, not easy to crack;

Less brittle than Wechster, but still more brittle than austenite.

Martensite is widely used in the manufacture of parts such as knives, springs and mechanical gears, and is also an important material for the manufacture of high-strength bolts and nuts.

Fourth, the characteristics and application of austenite.

Austenite is a microstructure obtained by the slow cooling of steel after heating to a critical temperature, and has the following characteristics:

Low hardness and poor wear resistance;

Good plasticity and toughness, not easy to crack;

It is the least brittle and the toughest of the three tissues.

Austenite is widely used in the manufacture of parts such as automobile parts, machine tools and gears, and is also an important material for the manufacture of parts such as springs and springs.

5. Selection of Wechsland, Martensite and Austenite.

How to choose Weistenite, martensitic and austenite? It depends on the environment and requirements in which the part is used. If the parts are required to have high hardness and strong wear resistance, you can choose Weismine or martensite; If the state requires high toughness and plasticity of parts, you can choose austenite.

Of course, when faced with the complexity of a real-world production environment, many factors need to be considered to determine the optimal organizational structure.

The above are the characteristics and applications of Wechster, martensitic and austenite, I hope it will be helpful to you.