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A method for controlling the microstructure of the surface layer by ultrasonic rolling

A technology of ultrasonic rolling and microstructure, applied in heat treatment process control, heat treatment equipment, manufacturing tools, etc., can solve the problem of lack of scientific and effective quantitative control methods without considering the grain refinement recrystallization mechanism and its strain rate effect And other issues

Active Publication Date: 2022-01-14
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

At present, the process test method is usually used to control the microstructure of the surface layer of material strengthening, and the grain refinement effect of the surface microstructure is verified by repeatedly adjusting the process parameters. The recrystallization mechanism and the strain rate effect that lead to grain refinement are not considered, which lacks science. , an effective quantitative control method

Method used

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  • A method for controlling the microstructure of the surface layer by ultrasonic rolling
  • A method for controlling the microstructure of the surface layer by ultrasonic rolling
  • A method for controlling the microstructure of the surface layer by ultrasonic rolling

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Embodiment Construction

[0014] This embodiment is an ultra-high-strength steel (45CrNiMoVA), and the critical strain at which dynamic recrystallization occurs at a high strain rate is obtained. The specific steps and parameters are as follows:

[0015] (1) The heat treatment state of ultra-high-strength steel is high-temperature quenching (870°C) + low-temperature tempering (210°C). Jinsen compression rod (size φ5mm) experiment, obtained high strain rate (1300s -1 、1500s -1 、3000s -1 、3500s -1 、4000s -1 ), the true stress-strain curve under ), such as figure 1 shown.

[0016] (2) Polish the deformed sample along the cross-section, corrode it with 4% nitric acid alcohol for 10s, and observe the metallographic structure changes under different deformation conditions, such as figure 2 shown, at a strain rate of 1300s -1 , Under the condition of strain 0.03, the metallographic structure of the sample has no obvious change, and the strain rate is 3000s -1 , strain 0.13 and strain rate 4000s -1 1...

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Abstract

The invention discloses a method for regulating and controlling grain refinement of surface microstructures during the ultrasonic rolling strengthening process of the surface of metal materials, and belongs to the technical field of surface strengthening of metal materials. The specific steps are: 1. Determine the strain and strain rate range of the surface material during the ultrasonic rolling process through theoretical calculation and numerical simulation (10 2 the s ‑1 -10 3 the s ‑1 order of magnitude); second, test the true stress-true strain curve of the material to be regulated under the corresponding strain rate range; third, determine the critical strain at which dynamic recrystallization occurs based on the true stress-strain curve under different strain rates; fourth, based on The critical strain of dynamic recrystallization can adjust the material processing parameters, control the strain and strain rate during the plastic deformation process of the material, and realize the precise control of the grain refinement of the material microstructure.

Description

technical field [0001] The invention belongs to the technical field of surface strengthening of metal materials, and in particular relates to a control method for grain refinement of surface microstructure in the process of ultrasonic rolling on the surface of metal materials. Background technique [0002] Fatigue fractures of mechanical structural parts during service often originate from the surface. Modifying and strengthening the surface of structural parts to change the surface morphology, stress, and structure of structural parts is an important means to improve the fatigue resistance of structural parts . In surface strengthening technology, surface rolling has been widely used. It is a strengthening technology that greatly reduces the surface roughness of structural parts through plastic deformation processing, introduces large residual compressive stress on the surface layer, and produces a grain refinement effect. Ultrasonic rolling is to add ultrasonic impact on ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P9/04C21D7/04C21D10/00C21D11/00
CPCC21D7/04C21D10/00C21D11/00
Inventor 梁志强栾晓圣陈一帆王西彬李宏伟周天丰焦黎解丽静刘志兵
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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