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Long products, method of thermo-chemical treatment and apparatus

a technology of thermo-chemical treatment and long products, applied in the direction of solid-state diffusion coating, coating, metal material coating process, etc., can solve the problems of long processing time, high cost and complex equipment, and achieve the effect of increasing the depth of the processed layer

Inactive Publication Date: 2007-05-03
ZELIM MICHAEL GREGORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0029] In one implementation, tension is maintained below material yield strength to avoid shape changing.
[0043] Present invention allows processing of long products manufactured of different metals: low carbon steel, high carbon steel, stainless steel titanium alloys, aluminum alloys, tungsten alloys, and any other metal showing improved strength, corrosion, impact strength, or any other targeted properties after thermo-chemical processing.
[0046] In contrast to currently used long products subjected to surface modification processing, present invention provides said product with increased effective strength.
[0050] In contrast to prior art, in present invention, thermo-chemical processing is combined with shape forming operation that increases depth of the processed layer.
[0051] In contrast to prior art, present invention allows achieving increased ratios of depth of the processed layer to the smallest transverse dimension of the processed material. While the depth of the layer with modified structure and properties in prior art is typically only a small fraction of the part's cross sectional dimension, according to the present invention, it can be significantly larger reaching one in case of fully modified cross section. For instance, in case of a small diameter filament or thin strip and foil, the modified layer can be all through the cross section.

Problems solved by technology

The main disadvantage of these methods is related to a relatively long processing time and expensive and complex equipment

Method used

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  • Long products, method of thermo-chemical treatment and apparatus
  • Long products, method of thermo-chemical treatment and apparatus
  • Long products, method of thermo-chemical treatment and apparatus

Examples

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example 1

[0117] Low carbon steel wire (1020 grade) with diameter of 1.5 mm was carburzed by using current process. Wire sample, 100 mm long, was clamped at the ends of two copper electrodes, and submerged in a silicon oil. The wire was heated by passing electric current through it to different temperatures, held at the temperature for a specified time, and then cooled down to ambient temperatures inside the processing tank or in the air. Various microstructures were achieved When wire was heated to temperature below 950 C, maximum carbon content at the surface was less than 1.2%, and corresponding microstructure was comprised pearlite and secondary cementite network. Structure of the wire core did not change and was comprised ferrite and pearlite. When wire was heated to temperature in the range from 1200 C and 1450 C, carbon concentration at the surface as high as close to 4.5% was achieved. Corresponding microstructure was comprised pearlite and primary cementite when cooling rate controll...

example 2

[0118] High carbon steel wire (1090 grade) with diameter of 0.5 mm was carburized by using current process. Wire sample was continuously fed through two copper electrodes submerged in a machine oil. The wire was heated by passing electric current through it to different temperatures. Wire feeding speed and take-up speed were synchronized. Various microstructures were achieved similar to the stationary heated wire. When wire was heated to temperature below 950 C, surface microstructure was comprised pearlite and secondary cementite network, while in the bulk was comprised ferrite and pearlite. When wire was heated to temperature in the range from 1200C and 1450 C, surface microstructure was comprised pearlite and primary cementite.

example 3

[0119] A high carbon steel wire (1080 grade) with diameter of 0.3 mm was liquid nitrided by using present method. Wire sample was continuously fed through a nitriding salts bath. A thin compound layer was produced after treatment giving wire excellent corrosion resistance properties.

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Abstract

The invention provides long products with stiffness controlled by the cross sectional shape, method of their thermo-chemical treatment, and apparatus for forming the final shape of the long products and thermo-chemical treatment.

Description

[0001] This patent application claims filing date of Provisional Patent No. 60 / 730,653 filed on Oct. 28, 2005. A. Field of the Invention [0002] Present invention is related to the field of long products and their thermo-chemical treatment, and more specifically to carburizing, nitriding, carbonitriding, boriding, and other similar processes of surface modification of continuous metal parts, such as wire, strip, sheet, and other long products. B. BACKGROUND OF THE INVENTION [0003] Long products, such as wire, strip, sheet, have dimension in one direction significantly exceeding dimensions in the other two directions. In many applications, stiffness and strength are critical properties of long products. A number of ways to control these properties have been developed, including controlling shape of the normal cross section to control stiffness and surface thermo-chemical treatment, specifically, strip carburizing and nitriding. Meanwhile, other methods of thermo-chemical surface treat...

Claims

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Application Information

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IPC IPC(8): C23C8/00
CPCC23C8/00
Inventor ZELIM, MICHAEL GREGORY
Owner ZELIM MICHAEL GREGORY
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