Metal and alloy organization and heat treatment common sense
专栏:Industry information
发布日期:2015-06-01
阅读量:490
作者:佚名
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(1) Metal structure 1. Metal: A substance that has opaque, metallic luster with good thermal and electrical conductivity and whose electrical conductivity decreases with increasing tempera..........

(1) Metal structure

      1. Metal: A substance that has opaque, metallic luster with good thermal and electrical conductivity and whose electrical conductivity decreases with increasing temperature, and is characterized by ductility and malleability. The internal atoms of the metal have a regular arrangement of solids (ie, crystals).

      2. Alloy: A substance having two or more metals or metals and non-metals and having metallic properties.

      3. Phase: The components of the alloy with the same composition, structure and properties.

      4. Solid solution: a solid metal crystal in which one (or several) elements of atoms (compounds) are dissolved in the lattice of another component while still maintaining the lattice type of another component, solid solution partitioned solid solution and Replace two solid solutions.

      5. Solid solution strengthening: Since the solute atoms enter the gap or junction of the solvent lattice, the lattice is distorted, and the hardness and strength of the solid solution are increased. This phenomenon is called solid solution strengthening.

      6. Compound: The alloying component is chemically combined to form a new crystalline solid structure with metallic properties.

      7. Mechanical mixture: An alloy composition composed of two crystal structures, although it is a crystal of two sides, is a constituent component and has independent mechanical properties.

      8. Ferrite: A gap solid solution of carbon in α-Fe (body-centered cubic structure of iron).

      9. Austenite: a gap solid solution of carbon in γ-Fe (iron of face-centered cubic structure).

      10. Cementite: a stable compound (Fe3c) formed by carbon and iron.

      11. Pearlite: a mechanical mixture of ferrite and cementite (F+Fe3c contains 0.8% carbon)

      12. Leysite: a mechanical mixture of cementite and austenite (containing 4.3% carbon)

      (2) Heat treatment

      A process in which a metal material is heated, cooled, and cooled in the solid state to change its texture and properties.

      13. Annealing: A heat treatment process in which a material or article of a metal or alloy is heated to a phase change or partial phase change temperature, held for a period of time, and then slowly cooled.

      14. Normalizing: A heat treatment process in which steel is heated to a temperature above the complete phase change and then cooled in air for a certain period of time.

      15. Quenching: A heat treatment process in which the steel is heated to a phase change or a partial phase change temperature, and after a period of heat preservation, rapid cooling.

      16. Tempering: heat treatment process in which the quenched steel is reheated to a certain temperature (below the phase transition temperature), kept for a period of time, and then cooled.

      17. Quenching and tempering treatment: quenching steel parts, followed by high temperature tempering. This compounding process is called quenching and tempering treatment.

      18. Surface heat treatment: a heat treatment process that changes the surface texture or chemical composition of a steel part to its surface properties.

Heat treatment A process in which a metal material is heated, cooled, and cooled in the solid state to change its texture and properties. 13. Annealing: A heat treatment process in which a material or article of a metal or alloy is heated to a phase change or partial phase change temperature, held for a period of time, and then slowly cooled. 14. Normalizing: A heat treatment process in which steel is heated to a temperature above the complete phase change and then cooled in air for a certain period of time. 15. Quenching: A heat treatment process in which the steel is heated to a phase change or a partial phase change temperature, and after a period of heat preservation, rapid cooling. 16. Tempering: heat treatment process in which the quenched steel is reheated to a certain temperature (below the phase transition temperature), kept for a period of time, and then cooled. 17. Quenching and tempering treatment: quenching steel parts, followed by high temperature tempering. This compounding process is called quenching and tempering treatment. 18. Surface heat treatment: a heat treatment process that changes the surface texture or chemical composition of a steel part to its surface properties.


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