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Austenite grain refined medium carbon steel and preparation method thereof

A technology of austenite grain and medium carbon steel, which is applied in the field of metal materials, can solve the problems of uneven deformation of the surface layer and core, uneven austenite grain size, complex process, etc., and achieve short process cycle and distributed Uniformity and simple preparation method

Active Publication Date: 2019-05-31
SHANXI TONGCAI IND & TRADE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method is realized through high-temperature deformation and recrystallization process. The process parameters (such as: deformation amount, temperature, holding time and cooling rate, etc.) are strictly controlled, and the process is complicated and the cycle is long; In the direction of compression deformation, the surface and core of the sample are deformed unevenly, which is likely to cause uneven austenite grain size in the recrystallization process

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  • Austenite grain refined medium carbon steel and preparation method thereof
  • Austenite grain refined medium carbon steel and preparation method thereof

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preparation example Construction

[0018] The invention provides a method for preparing medium-carbon steel with refined austenite grains, comprising the following steps:

[0019] Carrying out high-pressure heat treatment to the medium-carbon steel, maintaining the pressure of high-pressure heat treatment for cooling, and obtaining medium-carbon steel with refined austenite grains;

[0020] The pressure of the high-pressure heat treatment is 1-3GPa, the temperature is 900-1000°C, and the time is 15-20min.

[0021] In the invention, the medium-carbon steel is subjected to high-pressure heat treatment, and the pressure of the high-pressure heat treatment is maintained for cooling to obtain medium-carbon steel with refined austenite grains.

[0022] In the present invention, the medium carbon steel is preferably annealed medium carbon steel. In the present invention, the annealed medium carbon steel is preferably obtained by annealing ordinary medium carbon steel. The method of the annealing treatment is not par...

Embodiment 1

[0030] Take the annealed medium carbon steel, its chemical composition (mass fraction wt%) is: C 0.34, Si 0.28, Mn 0.62, P0.027, S 0.024, and the rest is Fe. Put it on a CS-ΙB type six-sided top press for high-pressure heat treatment, the pressure is 3GPa, the heating temperature is 1000°C, the holding time is 15min, and the power is turned off and the pressure is maintained to cool to room temperature. Its grain size is shown in Table 1.

Embodiment 2

[0032] Take annealed medium carbon steel, its chemical composition (mass fraction wt%) is: C 0.56, Si 0.32, Mn 0.61, P0.024, S 0.026, and the rest is Fe. Put it on a CS-ΙB type six-sided top press for high-pressure heat treatment, the pressure is 1GPa, the heating temperature is 1000°C, the holding time is 20min, and the power is turned off and the pressure is maintained to cool to room temperature. The grain size results are shown in Table 1.

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Abstract

The invention provides austenite grain refined medium carbon steel and a preparation method thereof and belongs to the technical field of metal materials. The preparation method comprises the following steps of conducting high-pressure heat treatment on medium carbon steel and cooling the medium carbon steel by maintaining the high-pressure heat treatment pressure to obtain the austenite grain refined medium carbon steel, wherein the high-pressure heat treatment pressure is 1-3 GPa, the high-pressure heat treatment temperature is 900-1000 DEG C, and the high-pressure heat treatment time is 15-20 min. According to the preparation method, the medium carbon steel is subjected to high-pressure heat treatment; high pressure can cause high strain in the structure of the medium carbon steel to generate high-density dislocations; the dislocations provide more parts for crystal nuclei of austenite grains, and the quantity of the formed austenite crystal nuclei is increased. Besides, under highpressure, atom diffusion is difficult, and growth of the austenite crystal nuclei is inhibited. Thus, according to the technical scheme provided by the invention, the obtained austenite crystal nucleiare fine and uniform in distribution. Moreover, the preparation method provided by the invention is simple and short in process cycle, and technological parameters are easy to control.

Description

technical field [0001] The invention relates to the technical field of metal materials, in particular to a medium-carbon steel with refined austenite grains and a preparation method thereof. Background technique [0002] Medium carbon steel has certain plasticity, toughness and strength, and is widely used in the production of various mechanical parts and engineering structural parts such as pump pistons, heavy machinery shafts, worms, gears, etc. With the rapid development of modern industry, higher requirements are put forward for the mechanical properties of medium carbon steel. The size of the austenite grain directly affects the microstructure and performance of the cooled steel. Generally, coarse austenite grains often lead to coarse structures after cooling, and the coarse structures have correspondingly lower plasticity and toughness; on the contrary, the fine structures have higher mechanical properties. Therefore, the refinement of austenite grains has attracted ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D7/13C22C38/02C22C38/04
Inventor 谌岩赵晓洁王岳峰杨猛刘建华
Owner SHANXI TONGCAI IND & TRADE