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Preparation method of double-transformed bainite steel

A bainitic steel, double technology, applied in the field of preparation of double transformed bainitic steel, can solve the problems of long time, incompleteness, low strengthening effect and toughening effect, etc.

Active Publication Date: 2022-01-28
刘鑫
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Diffusion in the high-temperature zone is only a transition, and the temperature in the lower bainite zone is low. It takes a long time for isothermal complete transformation, and it is not complete. The stable bainite structure can be obtained during the isothermal process, and the strengthening effect and toughness Low chemical effect

Method used

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  • Preparation method of double-transformed bainite steel
  • Preparation method of double-transformed bainite steel
  • Preparation method of double-transformed bainite steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The preparation method of the double transformation bainitic steel described in this embodiment uses the alloy components 1, 1-1, and 1-2 in Table 1 as raw material components respectively, according to the forming process (i.e. the smelting process), the double transformation normalizing The process, the quenching process and the tempering process are completed in sequence. Smelting process:

[0047] After the alloying elements are smelted, the forging process is used to shape the formed product. After cooling to 700°C for 48 hours, the formed product is cooled to room temperature to obtain the pearlite structure.

[0048] Normalizing process:

[0049] Heat the product to 850°C, the holding time is calculated according to the thickness of the workpiece, air-cool to 100°C above the Ms point, hold for 2 hours, then heat up and enter the quenching process.

[0050] Quenching process:

[0051] 1. High temperature section: heat the product to 950°C for heat preservation,...

Embodiment 2

[0060] The preparation method of the double transformation bainite steel described in this embodiment uses the alloy components 2, 2-1, and 2-2 in Table 1 as raw material components respectively, according to the forming process (i.e. the smelting process), the double transformation normalizing The process, the quenching process and the tempering process are completed in sequence. Smelting process:

[0061] After the alloying elements are smelted, the forging process is used to shape the formed product. The thickness of the formed product is 40mm. After the formed product is slowly cooled to room temperature and then raised to 700°C for 48 hours, the stack is cooled to room temperature to obtain the sorbite structure.

[0062] Normalizing process:

[0063] Heat the product to 900°C and keep it warm for 80 minutes. The holding time is calculated according to the thickness of the workpiece, 2.0min / xd, where xd is the thickness of the workpiece in mm. Air-cool to 30°C above the ...

Embodiment 3

[0074] The preparation method of the double transformation bainite steel described in this embodiment uses the alloy components 3, 3-1, and 3-2 in Table 1 as raw material components respectively, according to the forming process (i.e. the smelting process), the double transformation normalizing The process, the quenching process and the tempering process are completed in sequence. Smelting process:

[0075] After the alloying elements are smelted, the forging process is used to form the product. After forming the product, it is slowly cooled to room temperature, and then the temperature is raised to 900°C for heat preservation. After heat preservation, the furnace is cooled to 680°C for 48 hours, and then the stack is cooled to room temperature to obtain the pearlite structure.

[0076] Normalizing process:

[0077] Heat the product to 950°C and the holding time is calculated according to the thickness of the workpiece, 1.0min / xd, where xd is the thickness of the workpiece in m...

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Abstract

The invention discloses a preparation method of double-transformation bainite steel. The method sequentially comprises a forming procedure, a double-transformation normalizing procedure, a quenching procedure and a tempering procedure. The bainite steel is prepared from the following main alloy components: 0.1 to 1.8 weight percent of C, 0.6 to 3 weight percent of Cr, 1.0 to 6 weight percent of Mn, 0.01 to 3.0 weight percent of Al, 0.01 to 3.0 weight percent of Si, 0 to 5.0 weight percent of Zn, 0 to 5.0 weight percent of Ni, 0 to 2.0 weight percent of Mo, 0 to 2.0 weight percent of Cu, 0 to 5.0 weight percent of V, 0 to 5.0 weight percent of W, 0 to 0.5 weight percent of B, 0 to 0.5 weight percent of N and the balance of Fe. According to the method, the steps of obtaining a structure through bainite quenching at a low temperature and stabilizing the structure in the tempering process in a conventional process are inverted for implementation, the method comprises the steps of obtaining the structure from an austenite post-inoculation period to high-temperature diffusion, carrying out low-temperature shear refining and stabilizing, carrying out tempering to stabilize the structure again, and meanwhile, carrying out diffusion and partitioning on supersaturated carbon atoms from high temperature to low temperature; the stabilization time of the structure is shortened by several times or even dozens of times, and the strengthening effect and the toughening effect are improved by 20 to 300%.

Description

technical field [0001] The invention belongs to the technical application field of metal material processing, and in particular relates to a preparation method of double transformation bainite steel. Background technique [0002] Super bainite stabilized steel is widely used in structural steel and wear-resistant steel. Structural steel needs high strength and high toughness, and also has requirements for carbon equivalent; wear-resistant steel needs high strength, followed by toughness, and carbon equivalent is required but not strict. Bainite is divided into upper bainite, lower bainite and carbide-free bainite. The temperature range for obtaining bainite is narrow, and the process time is long. The obtained structure is basically in the lower bainite region, and the upper bainite region is Poor toughness. In terms of the stability of bainitic steel, Tsinghua University and Xigong University have summed up a large number of failure cracks and successful cases since the 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/20C22C38/22C22C38/24C22C38/26C22C38/28C22C38/30C22C38/32C22C38/34C22C38/36C22C38/38C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/54C22C38/56C22C38/58C22C38/60C21D1/18C21D1/28C21D6/00C21D8/00
CPCC22C38/36C22C38/38C22C38/04C22C38/06C22C38/02C22C38/34C22C38/002C22C38/22C22C38/20C22C38/24C22C38/32C22C38/001C22C38/60C22C38/26C22C38/005C22C38/28C22C38/30C22C38/008C22C38/42C22C38/44C22C38/46C22C38/48C22C38/50C22C38/52C22C38/54C22C38/56C22C38/58C21D1/28C21D1/18C21D6/002C21D6/004C21D6/005C21D6/007C21D6/008C21D8/005C21D2211/002C21D2211/009
Inventor 刘鑫朱明杨春娥
Owner 刘鑫