A method of applying induction normalizing to prepare laminated materials with grain gradient

A technology of laminated material and normalizing temperature, applied in the field of laminated material preparation, can solve the problems of complex organization control and high cost of equipment

Active Publication Date: 2020-07-07
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the above-mentioned problems existing in the prior art, the present invention provides a method of applying induction normalizing to prepare laminated materials with grain gradients, using the method of induction heating, adopting suitable heating process parameters, and sequentially heating the front and back of the steel

Method used

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  • A method of applying induction normalizing to prepare laminated materials with grain gradient
  • A method of applying induction normalizing to prepare laminated materials with grain gradient
  • A method of applying induction normalizing to prepare laminated materials with grain gradient

Examples

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Embodiment 1

[0024] A method for applying induction normalizing to prepare laminated materials with grain gradients, comprising the following steps:

[0025] (1) Partially normalize the surface of Q235 steel plate at a depth of 1mm by induction heating, the heating frequency is 200KHz, the heating power is 40KW, the normalizing temperature is 30°C above Ac3 or Acm, the heat preservation is 2min / mm, and the steel plate is obtained by air cooling to room temperature. ;

[0026] (2) Heating the steel plate piece obtained in step (1) to the recrystallization zone, then rolling the steel plate piece 4 times, each rolling downfall is 0.7mm, and the total downstroke is 60%, to obtain the final rolled steel piece ;

[0027] (3) The final-rolled steel plate obtained in step (2) is subjected to an overall recrystallization annealing heat treatment at a temperature of 30° C. above Ac3 or Acm, and a holding time of 20 min / mm, and is cooled in a furnace to obtain a laminated material.

[0028] The Q2...

Embodiment 2

[0030] A method for applying induction normalizing to prepare laminated materials with grain gradients, comprising the following steps:

[0031] (1) Induction heating is used to locally normalize the surface of the medium manganese steel plate at a depth of 2mm, the alloy composition is 0.25C-9Mn-0.02Cr-0.03Cu-0.03W-0.02Co, the heating frequency is 100KHz, and the heating power is 70KW. The normalizing temperature is 40°C above Ac3 or Acm, heat preservation for 1.5min / mm, and air-cooled to room temperature to obtain a steel plate;

[0032] (2) Heating the steel plate obtained in step (1) to the recrystallization zone, then rolling the steel plate 6 times, each time the rolling reduction is 0.9 mm, and the total reduction is 80%, to obtain the final rolled steel plate ;

[0033] (3) The final-rolled steel plate obtained in step (2) is subjected to an overall recrystallization annealing heat treatment at a temperature of 40° C. above Ac3 or Acm, and a holding time of 30 min / mm,...

Embodiment 3

[0036] A kind of application induction normalizing prepares the method for laminated material with grain gradient, comprises the following steps:

[0037] (1) Locally normalize the surface of 304 stainless steel plate at a depth of 3mm by induction heating, the heating frequency is 40KHz, the heating power is 100KW, the normalizing temperature is 50°C above Ac3 or Acm, heat preservation 1min / mm, and air-cooled to room temperature to obtain a steel plate pieces;

[0038] (2) Heating the steel plate obtained in step (1) to the recrystallization zone, then rolling the steel plate 6 times, each time the rolling reduction is 1.2 mm, and the total reduction is 90%, to obtain the final rolled steel plate ;

[0039] (3) The final-rolled steel plate obtained in step (2) is subjected to an overall recrystallization annealing heat treatment at a temperature of 50° C. above Ac3 or Acm, and a holding time of 40 min / mm, and is cooled in a furnace to obtain a laminated material.

[0040] 3...

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Abstract

The invention provides a method for preparing a laminated material with a grain gradient by using induction normalizing, comprising the following steps: using induction heating to partially normalize the surface of the steel plate, keeping it warm, and air cooling to room temperature to obtain a steel plate; Heating to the recrystallization zone, and then rolling the steel plate, each time the rolling pressure is 0.7-1.2mm, and the total pressure is 60-90%, to obtain the final rolled steel plate; the final rolled steel plate is recrystallized as a whole Annealing heat treatment, the temperature is 30-50°C above Ac3 or Acm, heat preservation, cooling with the furnace, to obtain laminated materials. The invention utilizes the method of induction heating, adopts appropriate heating process parameters, and sequentially induces normalizing treatment on the front and back sides of the steel plate, and then undergoes rolling treatment and recrystallization annealing, and realizes the high-strength plastic product without relying on alloying. The laminated material with grain gradient solves the problems of high cost, complicated equipment and difficult organization regulation in the prior art.

Description

technical field [0001] The invention belongs to the technical field of laminated material preparation, and in particular relates to a method for preparing laminated materials with grain gradients by applying induction normalizing. Background technique [0002] Lightweight and high safety are the basic requirements for materials of modern transportation and other high-end equipment and basic components. Lightweight can be achieved by increasing the strength of the material and reducing the density of the material; while high safety requires the material to have high strength and high toughness, so as to avoid the large deformation caused by the low strength of the parts during the collision or the sudden failure of the service due to insufficient toughness. Fractures cause catastrophic accidents. [0003] For decades, by continuously adding various alloying elements to steel, according to the transformation-induced plastic deformation effect (TRIP), twin crystal-induced plas...

Claims

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Application Information

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IPC IPC(8): C21D8/02C21D1/28C21D1/42
CPCC21D1/28C21D1/42C21D8/0205C21D8/0226C21D8/0263Y02P10/25
Inventor 李达曾强张乔王申熊敏
Owner SOUTHWEST JIAOTONG UNIV
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