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Heat treatment method for rapidly obtaining fine ferrite grains by low carbon alloy steel

A technology of low carbon alloy steel and heat treatment method, applied in the field of metallurgy, can solve problems such as high cost and long process cycle, and achieve the effects of low production cost, low equipment investment and simple operation

Inactive Publication Date: 2013-01-02
PANZHIHUA UNIV
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Problems solved by technology

The TMCP process has a long cycle and high cost, and many process parameters need to be strictly controlled to achieve

Method used

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  • Heat treatment method for rapidly obtaining fine ferrite grains by low carbon alloy steel
  • Heat treatment method for rapidly obtaining fine ferrite grains by low carbon alloy steel

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Embodiment 1

[0027] Phase transformation-induced ferrite phase transformation is mainly completed by the transformation of deformed austenite to ferrite. This transformation is carried out under the dual conditions of temperature overcooling and deformation. Both the thermodynamic and kinetic processes of phase transformation have a strong influence, they directly affect the evolution and control of phase transformation structure, and realize the refinement of ferrite grains. It is generally believed that the increase of carbon and manganese content is not conducive to the deformation-induced ferrite transformation, especially carbon has a great effect on reducing Ac3 (the lowest temperature at which ferrite disappears completely when the hypoeutectoid steel is heated), so that It directly affects the effect of deformation-induced ferrite phase transformation, so generally low-carbon or ultra-low-carbon carbon steel or alloy steel can achieve better induction of ferrite phase transformation...

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Abstract

The invention discloses a heat treatment method for rapidly obtaining fine ferrite grains by the low carbon alloy steel. The method includes steps of heating annealed low carbon alloy steel to 950 DEG C to 1000 DEG C and keeping the temperature for 20 minutes to 40 minutes; performing thermal deformation treatment to the processed low carbon alloy steel through a forging mode and controlling a compression ratio no less than 3; and standing the low carbon alloy steel after thermal deformation treatment in the air for 30 seconds to 50 seconds and fully cooling the low carbon alloy steel in cooling water. According to the method, annealed coarse ferrite and pearlite are turned into isometric, fine and uniform tissues with the ferrite first, and grains are less than 5 micrometers, so that the low carbon alloy steel is guaranteed to have high strength and good toughness, and further comprehensive mechanical properties are improved. The method is simple to operate, the production cost is low, and good application prospects are provided.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a heat treatment method for rapidly obtaining fine ferrite crystal grains in low-carbon alloy steel by using a deformation-induced ferrite phase transformation mechanism. Background technique [0002] Iron and steel materials play an important role in the modernization of society. The basic characteristics of a new generation of iron and steel materials are ultra-fine grain, high cleanliness, and high uniformity. The size of the grain directly affects the mechanical properties of the metal, and refining the grain is the only way to improve the strength and plasticity of the metal. There are many ways to refine the grain, one of which is Deformation Induced Ferrite Transformation (Deformation Induced Ferrite Transformation) ferrite transformation, referred to as DIFT). The essence of ferrite phase transformation is the increase of free energy caused by deformation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00
Inventor 王能为李洋周莹冯建伟方海军叶鹏丽
Owner PANZHIHUA UNIV
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