A kind of high-strength high-plasticity low-carbon medium manganese trip steel and preparation method thereof

A high-plasticity, high-strength technology, applied in the direction of manufacturing tools, heat treatment equipment, heat treatment process control, etc., can solve the problems of inverse phase transformation austenite that is difficult to stabilize room temperature, deteriorate material impact toughness, welding performance and fatigue performance, etc., to improve processing Hardening index, high plasticity, and the effect of reducing production cost

Active Publication Date: 2021-11-05
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, too high C content will seriously deteriorate the impact toughness, welding performance and fatigue performance of the material, so the higher the carbon content of general steel, the better.
[0004] In high-alloy steel, stable retained austenite can be obtained by one-step annealing heat treatment in the two-phase region, but in low-alloy steel, especially when the Mn content is low, the reverse phase transformation austenite obtained by one-step annealing heat treatment in the two-phase region Difficult to stabilize to room temperature

Method used

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  • A kind of high-strength high-plasticity low-carbon medium manganese trip steel and preparation method thereof
  • A kind of high-strength high-plasticity low-carbon medium manganese trip steel and preparation method thereof
  • A kind of high-strength high-plasticity low-carbon medium manganese trip steel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A preparation method of high-strength and high-plasticity low-carbon medium manganese TRIP steel, comprising the following steps:

[0050] Step 1: Smelting

[0051] According to the mass percentage, the chemical composition of the designed high-strength and high-plasticity low-carbon medium-manganese TRIP steel includes: C: 0.1%, Mn: 3.0%, Si: 0.2%, Al: 0.025%, Ti: 0.015%, P<0.015% , S<0.003%, the balance is Fe and unavoidable impurity elements. Alloy raw materials of various elements are smelted in a vacuum induction melting furnace and cast to obtain cast steel ingots.

[0052] Step 2: Forging

[0053] The as-cast steel ingot is forged into a billet. The as-cast steel ingot is heated to 1200°C-1250°C for 2.0 hours and then free forged. The starting forging temperature is 1230°C and the final forging temperature is greater than 950°C. After forging, it is cooled to room temperature to obtain a forged slab with a thickness of 150mm.

[0054] Step 3: Hot rolling

[...

Embodiment 2

[0073] A kind of preparation method of high-strength high-plasticity low-carbon medium manganese TRIP steel, its process flow chart is shown in figure 1 , including the following steps:

[0074] Step 1: Smelting

[0075] According to the mass percentage, the chemical design composition of the designed medium manganese steel is: C: 0.14%, Mn: 3.8%, Si: 0.4%, Al: 0.02%, Ti: 0.02%, P<0.015%, S<0.003%, and the rest The amount is Fe and unavoidable impurity elements. Alloy raw materials of various elements are smelted in a vacuum induction melting furnace and cast to obtain cast steel ingots.

[0076] Step 2: Forging

[0077] Forge the as-cast steel ingot into a billet, then heat it to 1200°C-1250°C for 2.0 hours and then carry out free forging. The starting forging temperature is 1230°C, and the final forging temperature is greater than 950°C. After forging, cool to room temperature to obtain a thickness of 150mm. forged slabs.

[0078] Step 3: Hot rolling

[0079] Place the...

Embodiment 3

[0097] A preparation method of high-strength and high-plasticity low-carbon medium manganese TRIP steel mainly comprises the following steps:

[0098] Step 1: Smelting

[0099] A high-strength, high-plasticity low-carbon medium-manganese TRIP steel, the chemical composition of which is: C: 0.08%, Mn: 3.1%, Si: 0.3%, Al: 0.04%, Ti: 0.015%, P<0.015% , S<0.003%, the balance is Fe and unavoidable impurity elements.

[0100] According to the above alloy composition, the raw materials are smelted in a vacuum induction melting furnace and cast to obtain cast steel ingots.

[0101] Step 2: Forging

[0102] Forge the as-cast steel ingot into a billet, heat the billet at 1200°C-1250°C for 2.0h, and then perform free forging. 150mm forged slab.

[0103] Step 3: Hot rolling

[0104] Place the forged slab in the RX3-90-12 high-temperature heating furnace under a nitrogen atmosphere, heat it to 1200°C and keep it for 2.0h to ensure the homogenization of the alloy elements of the cast s...

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Abstract

A high-strength, high-plasticity low-carbon medium-manganese TRIP steel and a preparation method thereof belong to the technical field of high-strength and high-plasticity steels. The high-strength and high-plasticity low-carbon medium-manganese TRIP steel includes components and the mass percentages of each component are: C: 0.08-0.16%, Mn: 2.9-4.0%, Si: 0.1-1.5%, Al: 0.01-0.08%, Ti : 0.005~0.04%, P<0.015%, S<0.003%, the balance is Fe and unavoidable impurity elements. Its preparation method adopts the raw materials of the above chemical composition through smelting, casting, forging, hot rolling, and two-step annealing in the two-phase zone. It has high strength, high plasticity, and good impact toughness. The heat treatment process is simple and feasible, and it is easy to realize industrial continuous production.

Description

technical field [0001] The invention belongs to the technical field of high-strength and high-plasticity steel, and in particular relates to a high-strength, high-plasticity low-carbon medium-manganese TRIP steel and a preparation method thereof. Background technique [0002] The medium manganese steel is named after the composition, and the mass fraction of Mn is usually 3% to 10%. It was first discovered by Professor Morris in the United States when he was studying high-toughness steel in the 1980s, and it can be transformed through the Austenite Reverted Transformation method (Austenite Reverted Transformation, ART) obtained a large amount of austenite and ultrafine-grained ferrite in low-carbon steel with a Mn content of 5% (mass fraction)[Miller R L. Ultrafine grained microstructure and mechanical properties of alloy steel[J].Metallurgical Transactions A, 1972, 3(4):905.]. The current production of medium manganese steel is usually combined with the TRIP steel process,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/06C22C38/14C22C33/04C21D8/02C21D1/26C21D9/00C21D11/00
CPCC21D1/26C21D8/0205C21D8/0226C21D8/0247C21D9/0081C21D11/00C21D2211/001C21D2211/005C22C33/04C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 王立军刘春明
Owner NORTHEASTERN UNIV LIAONING
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