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High-strength-and-ductility gray pig iron surface tissue form heating power reconstruction method

A technology of microstructure and gray cast iron, which is applied in the field of thermal reconstruction of the surface microstructure of high-strength and tough gray cast iron, can solve the problems of prolongation, large brittleness of the surface strengthening layer, and unfavorable service life, so as to reduce the splitting effect and increase the surface Defect density, the effect of improving strength and toughness

Active Publication Date: 2018-02-16
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the plasticity and toughness of cementite is almost zero, which makes the surface strengthening layer more brittle, which is not conducive to the extension of service life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A) Grinding, polishing, cleaning and drying the surface of HT200 gray cast iron;

[0028] B) Fix the pretreated gray cast iron sample on the numerically controlled mobile platform, adjust the distance between the focusing lens and the workpiece, and determine that the defocusing amount is 15mm;

[0029] C) The pretreated gray cast iron surface is subjected to laser melting treatment with a continuous Nd:YAG laser under 0.5T static magnetic field and liquid nitrogen forced cooling. The laser power is 1000W, the scanning speed is 10mm / s, and the overlap rate is 80 %;

[0030] D) Set an aluminum foil absorbing layer on the surface of the gray cast iron after laser melting treatment, and use flowing water as a constrained layer to perform laser shock treatment, and the laser power density is 10GW / cm 2 , the laser pulse width is 40ns, the spot diameter is 10mm, and the overlap rate is 50%;

[0031] E) The gray cast iron after laser shock treatment is subjected to graphitiz...

Embodiment 2

[0034] A) Grinding, polishing, cleaning and drying the surface of HT150 gray cast iron;

[0035] B) Fix the pretreated gray cast iron sample on the numerically controlled mobile platform, adjust the distance between the focusing lens and the workpiece, and determine that the defocus amount is 10mm;

[0036] C) The pretreated gray cast iron surface is subjected to laser melting treatment with a continuous Nd:YAG laser under 1T static magnetic field and liquid nitrogen forced cooling. The laser power is 1500W, the scanning speed is 20mm / s, and the overlap rate is 20%. ;

[0037] D) Set an aluminum foil absorbing layer on the surface of the gray cast iron after laser melting treatment, and use K9 glass as the constrained layer for laser shock treatment, and the laser power density is 1GW / cm 2 , the laser pulse width is 5ns, the spot diameter is 3mm, and the overlap rate is 80%;

[0038] E) The gray cast iron after laser shock treatment is subjected to graphitization annealing t...

Embodiment 3

[0041] A) Grinding, polishing, cleaning and drying the surface of HT100 gray cast iron;

[0042] B) Fix the gray cast iron sample after pretreatment on the numerically controlled mobile platform, adjust the distance between the focusing mirror and the workpiece, and determine that the defocus amount is 20mm;

[0043] C) The pretreated gray cast iron surface was cooled by continuous CO under 2T rotating magnetic field and liquid nitrogen forced cooling. 2 The laser is used for laser melting treatment, the laser power is 3000W, the scanning speed is 50mm / s, and the overlapping rate is 50%;

[0044] D) Set an aluminum foil absorbing layer on the gray cast iron surface after laser melting treatment, and use flowing water as a constrained layer to perform laser shock treatment, and the laser power density is 6GW / cm 2 , the laser pulse width is 10ns, the spot diameter is 1mm, and the overlap rate is 20%;

[0045] E) The gray cast iron after laser shock treatment is subjected to gr...

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Abstract

The invention discloses a high-strength-and-ductility gray pig iron surface tissue form heating power reconstruction method, and relates to metal material surface modification. The method mainly comprises the steps of gray pig iron surface magnetic control forced cooling laser fusion, laser shock and follow-up graphitization annealing treatment. Firstly, laser radiation is carried out to enable the gray pig iron surface to generate quick fusion under the action of a magnetic field, forced cooling solidification is carried out, and the wee surface white tissue is formed; secondly, laser shock is adopted for treating the gray pig iron surface obtained after laser fusion, the stress state of a fusion layer is changed, the white tissue on the surface layer is further refined, the tissue defectis increased, and tissue preparation is made of graphitization annealing; and finally, graphitization annealing is carried out to enable cementite in the surface refined whit tissue to be converted into wee spheroidal graphite, and the high-strength-and-ductility surface tissue form is prepared. By means of the method, the gray pig iron surface tissue form can be effectively improved, the graphitization time is shortened, and the surface obdurability is obviously improved. The high-strength-and-ductility gray pig iron surface tissue form heating power reconstruction method is simple in process procedure, easy to operate and suitable for large-scale batched production.

Description

technical field [0001] The invention belongs to the technical field of surface modification of metal materials, and relates to a thermal reconstruction method for the surface structure of high-strength gray cast iron. Background technique [0002] Gray cast iron production equipment and process are simple, low cost, excellent casting performance, good shock absorption performance and wear resistance, has been widely used in vehicles, machine tools and other important parts, accounting for a very large proportion of cast iron parts . However, the structure of gray cast iron is composed of matrix structure and flake graphite, and the strength and toughness of graphite are close to zero. Therefore, the existence of flake graphite seriously destroys the continuity of the matrix and reduces the effective cut-off of the matrix under load. The area has a very large effect of splitting the matrix, which greatly weakens the contribution of the matrix structure to the mechanical prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D10/00C21D1/26C21D5/02
CPCC21D1/26C21D5/02C21D10/00C21D10/005
Inventor 崔承云彭希超崔熙贵方翠张文龙阮仲伟李晓东
Owner JIANGSU UNIV
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