Three-step annealing process for aluminum-free ultra-high carbon steel

A technology of ultra-high carbon steel and annealing process, applied in manufacturing tools, heat treatment equipment, heat treatment process control, etc., to achieve the effect of easy operation and low energy consumption

Inactive Publication Date: 2014-12-24
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports at home and abroad on the research work on the aluminum-free ultra-high carbon steel obtained by the annealing process from pearlite plus fine and uniformly distributed granular carbides

Method used

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  • Three-step annealing process for aluminum-free ultra-high carbon steel
  • Three-step annealing process for aluminum-free ultra-high carbon steel
  • Three-step annealing process for aluminum-free ultra-high carbon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A three-step annealing process for aluminum-free ultra-high carbon steel, the composition and content expression of the ultra-high carbon steel is Fe-1.58C-1.97Cr-0.26Si-0.73Mn-0.09Mo, the three-step annealing The steps of the process are as follows:

[0023] 1) Austenitizing treatment: heat the material to 840°C at a heating rate of 5°C / min and hold for 2 hours;

[0024] 2) Cooling treatment after austenitization: cooling the austenitized isothermal ultra-high carbon steel from 840°C to 750°C at a cooling rate of 3°C / s;

[0025] 3) Isothermal treatment: The ultra-high carbon steel is isothermally treated at 750°C for 50 minutes, so that the ultra-high carbon steel isothermally obtained a structure composed of pearlite and fine and uniformly distributed granular carbides; after isothermal treatment, the furnace Cool to room temperature.

[0026]

[0027] figure 1 It is the metallographic photograph of the sample obtained in Example 1 of the present invention, and a...

Embodiment 2

[0030] A three-step annealing process for aluminum-free ultra-high carbon steel, the composition and content expression of the ultra-high carbon steel is Fe-1.58C-1.97Cr-0.26Si-0.73Mn-0.09Mo, the three-step annealing The steps of the process are as follows:

[0031] 1) Austenitizing treatment: heat the material at a heating rate of 8°C / min to 860°C for 2.5 hours;

[0032] 2) Cooling treatment after austenitization: cooling the austenitized isothermal ultra-high carbon steel from 860°C to 770°C at a cooling rate of 5°C / s;

[0033] 3) Isothermal treatment: The ultra-high carbon steel is isothermally treated at 770°C for 65 minutes, so that the ultra-high carbon steel isothermally obtained a structure composed of pearlite and fine and uniformly distributed granular carbides; after isothermal treatment, the furnace Cool to room temperature.

[0034]

[0035] figure 2 It is the metallographic photograph of the sample obtained in Example 2 of the present invention, and a struct...

Embodiment 3

[0038] A three-step annealing process for aluminum-free ultra-high carbon steel, the composition and content expression of the ultra-high carbon steel is Fe-1.58C-1.97Cr-0.26Si-0.73Mn-0.09Mo, the three-step annealing The steps of the process are as follows:

[0039] 1) Austenitizing treatment: heat the material to 880°C at a heating rate of 10°C / min and hold for 3 hours;

[0040] 2) Cooling treatment after austenitization: cooling the austenitized isothermal ultra-high carbon steel from 880°C to 790°C at a cooling rate of 8°C / s;

[0041] 3) Isothermal treatment: Ultra-high carbon steel is isothermally treated at 790°C for 80 minutes, so that ultra-high carbon steel isothermally obtained a structure composed of pearlite and fine and uniformly distributed granular carbides; after isothermal treatment, the furnace Cool to room temperature.

[0042]

[0043] image 3 It is the metallographic photograph of the sample obtained in Example 3 of the present invention, and a structu...

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Abstract

The invention discloses a three-step annealing process for aluminum-free ultra-high carbon steel. The component and content expression of the ultra-high carbon steel is Fe-1.58C-1.97Cr-0.26Si-0.73Mn-0.09Mo. The whole process of a heat treatment process is implemented under an air environment condition, and comprises the following steps: first performing austenitizing isothermal treatment on materials at 840 to 880 DEG C; then cooling the materials to 750 to 790 DEG C at the cooling speed of 3 to 8 DEG C per second; finally performing isothermal treatment at 750 to 790 DEG C, and performing furnace cooling to room temperature after the isothermal treatment. According to the three-step annealing process, by a heat treatment annealing process comprising three associated and combined steps, the effective dissolution of carbide is ensured, the re-precipitation of massive or reticular carbide after the ultra-high carbon steel is completely austenitized is prevented, the materials can form a structure consisting of pearlites and fine and uniformly-distributed granular carbide, and the toughness of the materials is improved.

Description

technical field [0001] The invention relates to an annealing process for ultra-high carbon steel, in particular to a three-step annealing process for refining carbides in ultra-high carbon steel. Background technique [0002] Iron-based alloy materials with a carbon content of 1.0-2.1 wt% are called ultra-high carbon steels. Due to the high carbon content, it is difficult to avoid the segregation of carbon and the formation of a large number of network carbides in the traditional method when preparing ultra-high carbon steel, so that the steel has extremely high brittleness, so the application of ultra-high carbon steel in industrialization has always been ignored by people. [0003] In order to solve the problem of high material brittleness caused by the existence of coarse or network carbides, a lot of research has been carried out internationally on ultra-high carbon steel containing aluminum elements and a series of processing technologies have been formed. At present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/26C21D6/00C21D11/00
Inventor 刘庆锁孟亮石卫东王晶薛贯鲁
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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