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Method for preparing superfine multiple-phase structure high-carbon steel

A high-carbon steel, ultra-fine technology, applied in the direction of manufacturing tools, heat treatment equipment, heat treatment process control, etc., can solve the problems of large energy consumption, complex process, large cumulative strain, etc., to reduce strain and simplify deformation Process, good thermal stability effect

Inactive Publication Date: 2008-09-17
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned process is relatively complicated and requires a large cumulative strain (typical cumulative strain is 3.0), which consumes a large amount of energy.

Method used

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  • Method for preparing superfine multiple-phase structure high-carbon steel
  • Method for preparing superfine multiple-phase structure high-carbon steel
  • Method for preparing superfine multiple-phase structure high-carbon steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] figure 2 The carbon content of the superfine multi-phase structure high-carbon steel prepared according to the hot deformation process of the present invention is 0.97%, and the content of other alloy elements is within the usual range of ordinary carbon steel. Its A was measured by thermal dilatation method cm 816°C, A 1 is 730°C, when the cooling rate C1 is 30°C / s, Ar cm is 600°C. Heat the high-carbon steel to 1050°C for 10 minutes and then cool it to 650°C at a cooling rate of 30°C / s. -1 When the strain rate is deformed to a strain of 1.6, it is water-cooled, and the cooling rate is 200°C / s to room temperature, and the obtained figure 2 In the superfine multi-phase structure shown, the average grain size of ferrite is about 0.60 microns, and the average size of cementite particles is about 0.35 microns. There is obvious network cementite in the equilibrium state (slow cooling after full austenitization) structure of this high carbon steel, but when it is defor...

Embodiment 2

[0027] Figure 4 The carbon content of the superfine multi-phase structure high-carbon steel prepared according to the hot deformation process of the present invention is 0.80%, and the content of other alloy elements is within the usual range of ordinary carbon steel. Measured by thermal expansion method, A 1 is 727°C, when the cooling rate C1 is 20°C / s, Ar 1 It is 598°C. Heat the high-carbon steel to 1000°C for 10 minutes and then cool it to 600°C at a cooling rate of 20°C / s. -1 When the strain rate is deformed to a strain of 1.6, it is water-cooled, and the cooling rate is 200°C / s to room temperature, and the obtained Figure 4 In the superfine multi-phase structure shown, the average grain size of ferrite is about 0.72 microns, and the average size of cementite particles is about 0.10 microns. The equilibrium state (slow cooling after full austenitization) structure of this high carbon steel is lamellar pearlite, but when deformed according to the hot deformation proce...

Embodiment 3

[0030] The strain rate in embodiment 2 is brought up to 1s -1 , when the strain amount reaches 1.6, only the pearlite can be partially spheroidized, and the water-cooled tissue such as Figure 7 shown. Subsequent isothermal treatment of the deformed structure, that is, after holding at 650°C for 30 minutes, an ultra-fine multi-phase structure can be obtained, such as Figure 8 shown. Among them, the average grain size of ferrite is about 0.65 microns, and the average size of cementite particles is about 0.16 microns.

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Abstract

The invention discloses a making method of hyperfine composite phased structural high-carbon steel based on deformed supercooled austenite, which is characterized by the following: heating high-carbon steel into austenite; cooling austenite to certain temperature between A1 and Arcm temperature; deforming eutectoid steel at 50-300 deg.c; setting the strain velocity between 0.001s-1 and 30s-1 and strain quantity between 1.6 and 2.0; obtaining the hyperfine composite phased structural high-carbon steel through deforming course; proceeding isothermal disposal between 500 and A1 temperature for 10-60 min for obtained deforming tissue; obtaining the product with crystal grain size of isometric ferrite less than 1um and particle cementite size less than 0.5um.

Description

technical field [0001] The invention relates to a method for preparing high-carbon steel with ultra-fine multi-phase structure, in particular to a method for preparing high-carbon steel with ultra-fine multi-phase structure based on supercooled austenite deformation. Background technique [0002] The typical structure of ordinary eutectoid steel is lamellar pearlite structure. Since pearlite is composed of softer ferrite sheets and hard and brittle cementite sheets, ordinary eutectoid steel has higher strength but poor plasticity, and needs to be spheroidized and annealed before being used for machining. Generally, the spheroidizing annealing treatment requires special spheroidizing annealing equipment, and needs to be annealed at a higher temperature (for example, 700° C.) for more than ten hours or even tens of hours. The production cycle is long and the energy consumption is high. The structure obtained by spheroidizing annealing is relatively coarse, the cementite parti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00C21D11/00
Inventor 孙祖庆杨王玥李龙飞黄青松陈伟
Owner UNIV OF SCI & TECH BEIJING