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A kind of nano-bainite steel with rapid phase transformation and its preparation method

A bainitic steel and nanotechnology, applied in the field of alloys, can solve the problems of long nano-bainite transformation time and unfavorable production, and achieve the effects of shortening preparation time, improving production efficiency, and improving low-temperature isothermal transformation rate

Active Publication Date: 2020-09-01
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Due to the above deficiencies in the prior art, the present invention provides a rapid phase transformation nano-bainite steel material, which solves the problem that the nano-bainite phase transformation time is too long and is not conducive to production

Method used

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  • A kind of nano-bainite steel with rapid phase transformation and its preparation method
  • A kind of nano-bainite steel with rapid phase transformation and its preparation method
  • A kind of nano-bainite steel with rapid phase transformation and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of nano-bainite steel, its content of alloy elements, by mass percentage, is C: 0.51%, Si: 1.72%, Mn: 0.83%, Al: 1.48%, Co: 0.56%, Cr: 0.98%, Mo: 0.25 %, Ni: 0.60%, Nb: 0.04%, and the balance is Fe.

[0029] The preparation method is as follows:

[0030] (1) Heat the billet to 1050°C and keep it warm for 30 minutes to obtain austenite A;

[0031] (2) Austenite A is rapidly cooled to 210°C by salt bath quenching and kept for 30s to obtain a small amount of martensite M;

[0032] (3) Quickly transfer the steel to 280°C, keep it warm for 1 hour, and then air-cool to room temperature to obtain nano-bainitic steel.

[0033] The hardness (HV3) of the finally obtained nano-bainitic steel was 561.

Embodiment 2

[0035] A kind of nano-bainite steel, its content of alloy elements, by mass percentage, is C: 0.51%, Si: 1.72%, Mn: 0.83%, Al: 1.48%, Co: 0.56%, Cr: 0.98%, Mo: 0.25 %, Ni: 0.60%, Nb: 0.04%, and the balance is Fe.

[0036] The preparation method is as follows:

[0037] (1) Heating the billet to 1050°C and keeping it warm for 30 minutes to obtain austenite A;

[0038] (2) Austenite A is rapidly cooled to 220°C by salt bath quenching and kept for 30s to obtain a small amount of martensite M;

[0039] (3) Quickly transfer the steel to 280°C, keep it warm for 1 hour, and then air-cool to room temperature to obtain nano-bainitic steel.

[0040] The hardness (HV3) of the finally obtained nano-bainite steel was 559.

Embodiment 3

[0042] A kind of nano-bainite steel, its content of alloy elements, by mass percentage, is C: 0.51%, Si: 1.72%, Mn: 0.83%, Al: 1.48%, Co: 0.56%, Cr: 0.98%, Mo: 0.25 %, Ni: 0.60%, Nb: 0.04%, and the balance is Fe.

[0043] The preparation method is as follows:

[0044] (1) Heat the billet to 1050°C and keep it warm for 30 minutes to obtain austenite A;

[0045] (2) Austenite A is rapidly cooled to 235°C by salt bath quenching and kept for 30s to obtain a small amount of martensite M;

[0046] (3) Quickly transfer the steel to 280°C, keep it warm for 1 hour, and then air-cool to room temperature to obtain nano-bainitic steel.

[0047] The hardness (HV3) of the final nano-bainitic steel obtained was 544.

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Abstract

The invention discloses a rapid phase change nanometer bainite steel and a preparation method and belongs to the field of alloys. The rapid phase change nanometer bainite steel is subjected to composition optimization design and includes the following chemical components: C: 0.3-0.6%, Si: 1.5-2%, Mn: 0.6-1%, Al: 1-1.5%, Co: 0.5-0.8%, Cr: 0.8-1.2%, Mo: <= 0.5%, Ni: 0.5-1%, Nb: 0.02-0.1%, P: <=0.05%, S: <=0.05%, the balance Fe and the unavoidable impurities. The nanometer bainite steel provided by the invention has no induction period of phase change, the completion time of phase change is lessthan 60 minutes, the rapid phase change nanometer bainite steel and the preparation method greatly improve the rate of low temperature isothermal transformation of the nanometer bainite, significantlyshorten the preparation time and improve the production efficiency.

Description

technical field [0001] The invention belongs to the field of alloys, in particular to a rapid phase transformation nano-bainite steel and a preparation method thereof. Background technique [0002] Ultra-finebainitic steel with nanoscale carbide-free bainite and retained austenite structure exhibits better matching of strength, plasticity and toughness, but the transformation time of nanobainitic is long, which restricts its production and application. The early nano-bainite steel adopts the idea of ​​high C and high Si to design the composition, and isothermal for dozens of hours to obtain nano-bainite, which has poor toughness and weldability; currently, deformation and phase transformation are combined to accelerate the nano-bainite phase. The shortest time to change is more than 2 hours. [0003] During 2001-2003, Spanish Caballero and British Bhadeshia and other studies found that the high-silicon high-carbon low-alloy steel with a carbon content of 0.75-0.98% Fe-Si-M...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/52C22C38/44C22C38/48C22C38/60C21D1/22C21D1/20
CPCC21D1/20C21D1/22C21D2211/002C22C38/04C22C38/06C22C38/34C22C38/44C22C38/48C22C38/52C22C38/60
Inventor 齐亮李智勇王道武汪志刚赵鸿金
Owner JIANGXI UNIV OF SCI & TECH
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