CN1004762B - Controlled deep ion-nitridation method - Google Patents
Controlled deep ion-nitridation method Download PDFInfo
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- CN1004762B CN1004762B CN85107162.7A CN85107162A CN1004762B CN 1004762 B CN1004762 B CN 1004762B CN 85107162 A CN85107162 A CN 85107162A CN 1004762 B CN1004762 B CN 1004762B
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- nitriding
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Abstract
The present invention relates to a controllable deep glow ion nitridation method. In order to improve the fatigue resistant performance of a steel part in an alloy structure, the depth of a nitriding layer can be increased as much as possible, and a surface brittleness compound can be restrained. The method uses the gas mixture of N2 and H2 containing 5 to 50 % of nitrogen to obtain a nitriding layer with the depth of 0.7 to 1.0mm, a single-phase compound of which the surface phase component is gamma' or a pure diffusion layer without a compound through glow ion nitridation at three sections of temperature of 450 to 550 DEG C, 550 to 650 DEG C and 450 to 550 DEG C for 45 to 65 hours.
Description
This is the invention that belongs to glow ion nitriding thermo-chemical treatment field.
As everyone knows, the structural alloy steel part is handled through nitriding, can improve fatigue property, and increases nitrided case depth, to improving fatigue property positive effect is arranged.This improves wearing quality and has good effect bearing the driving member of higher load.
In 100% ammonia atmosphere steel components is carried out glow ion nitriding, the nitrided case depth in industrial acquisition widespread use is 0.3-0.5mm usually, and the piece surface phase composition can not be controlled, and easily produces brittle compound layer.If change the nitridation process parameter, in the hope of the thickening depth of penetration, then be accompanied by the increase of nitrided case depth, the ratio of surface brittleness compound also can correspondingly increase, network of vein shape nitride in the diffusion layer also is tending towards seriously, makes the danger of steel part surface generation in use spalling failure strengthen, after causing some high loading part nitriding, need grind off the surface brittleness compound layer could use, and this certainly will increase the manufacturing cost and the man-hour of part.
Use N instead
2+ H
2Gas mixture is made the nitriding source of the gas, though can control the steel piece surface phase composition, suppresses frangible compounds, and nitrided case is shallow, and industrial widespread use is restricted.
The objective of the invention is: in the glow ion nitriding process, use the N of nitrogenous 5-50%
2+ H
2Gas mixture.Through three sections nitridings, make steel part obtain the nitrided case of 0.7-1.0mm; The steel piece surface phase composition can be controlled, and obtains the single-phase compound layer of r ' or does not have the pure diffusion layer of compound.
The steel that the present invention uses are structural alloy steels of the Cr, the Mo that contain one or more, V, W, Ni, Al alloying element.Above-mentioned steel components obtains desired matrix hardness and metallographic structure through modified pre-treatment, carries out three sections nitridings, first section nitriding temperature 450-550 ℃ then in the glow ion nitriding stove, and second section nitriding temperature is 550-650 ℃; The 3rd section nitriding temperature 450-550 ℃.Nitriding atmosphere is the N of nitrogenous 5-50%
2+ H
2Gas mixture, nitriding soaking time 45-65 hour.
The steel that the present invention uses contain certain density alloying element in the matrix after relevant temperature quenching and tempering, can improve the nitriding performance, make the hardness gradient that obtains needed surface hardness and distribute along section after the steel part nitriding.But tempering temperature must still keep original matrix hardness to guarantee steel part than the high 30-40 of nitriding temperature ℃ in long-time nitriding process.
The equal drying of nitrogen used in the present invention and hydrogen, purifying treatment to remove moisture and impurity, prevent that steel piece surface from producing defectives such as oxidation and decarbonization.Absorbed by the metallic surface in order to accelerate nitrogen-atoms, the present invention adopts H
2The gas heat temperature raising is to promote the piece surface activation.
The present invention implements through the following steps, and its process curve is seen Fig. 1.
The steel part that cleans up is placed the glow ion nitriding stove, is anode with the body of heater, and workpiece is a negative electrode, send the direct current build-up of luminance, and feeds H
2The gas lift temperature.At 350-400 ℃ of samming 1-2 hour, be warming up to 450-550 ℃ again, turn off H
2Gas is used the N of nitrogenous 5-50% instead
2+ H
2Gas mixture, the insulation some hrs is finished first section nitriding.Continue to heat up,, finish second section nitriding in 550-650 ℃ of insulation and adjustment atmosphere ratio.Lower the temperature then 450-550 ℃ of insulation, and adjust the atmosphere ratio, finish the 3rd section nitriding.Last stove is cold, finishes whole technical process of nitriding.In three sections nitridings,, adjust the ratio of gas mixture according to the chemical composition of steel and the actual temperature in nitriding stage, when nitrogenous value changes in the 5-50% scope, final nitriding result, the steel piece surface phase composition can be according to needs control, obtains the single-phase compound layer of r ' or do not have the pure diffusion layer of compound.Through 45-65 hour insulation, the steel part nitrided case depth was 0.7-1.0mm.
The present invention is easy and simple to handle, process stabilizing, and part deformation is little.Can shorten cycle 30-40% than gas nitriding.Because the surface that obtains 0.7-1.0mm is single-phase compound of r ' or the pure diffusion layer that does not have compound, and the steel part fatigue property is significantly improved, for the driving member of high precision high loading antifatigue provides effective surface hardening process.
Example:
25Cr
2MoVA steel shaft gear, Mn=6, the number of teeth 20, α=20 °, β=9 ° 22 ', Contact Stress of Gear is 811N/mm
2Through 940 ℃ of heating quenchings, 620 ℃ of tempering, matrix hardness HB320-340, metallographic structure is a sorbite.After cleaning up, in LD-100KW glow ion nitriding stove, feed H
2The gas lift temperature.400 ℃ of sammings 1 hour, continue to be warming up to 500-550, turn off H
2Gas feeds the N of nitrogenous 5-15%
2+ H
2The gas mixture insulation is finished first section nitriding, then 550-600 ℃ of insulation.And the nitrogenous value of adjusting gas mixture is 15-30%, finishes second section nitriding, and at last 500-550 ℃ of insulation, and the nitrogenous value of adjusting gas mixture is 5-15%, finishes the 3rd section nitriding.Omnidistance through after the insulation in 55 hours, stove is chilled to below 200 ℃ and comes out of the stove.The nitriding result sees Fig. 2 and Fig. 3 for details.It can be said that bright effect of the present invention.
Description of drawings:
Fig. 1 is the process curve figure of three sections nitridings.
Fig. 2 is by after the invention process, steel part section hardness gradient figure.
Fig. 3 is by after the invention process, the x-ray diffraction pattern of steel piece surface phase composition.Radiation is FeKa.
Claims (2)
1, the control surface phase structure is single-phase compound layer of r ' or the structural alloy steel ion nitriding method that does not have the pure diffusion layer of compound, it is characterized in that, uses the N of nitrogenous 5-50%
2+ H
2Gas mixture is a source of the gas, through three sections temperature insulations 45-65 hour, obtains the nitrided case of 0.7-1.0mm, and wherein, first section oozes temperature by force is 450-550 ℃, and it is 550-650 ℃ that temperature is oozed in second section expansion, and it is 450-550 ℃ that the 3rd section benefit oozed temperature.
2, according to the described ion nitriding method of claim 1, wherein N
2+ H
2The nitrogenous value of gas mixture is adjusted into respectively in three phases, first section 5-15%, second section 15-30%, the 3rd section 5-15%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85107162.7A CN1004762B (en) | 1985-09-26 | 1985-09-26 | Controlled deep ion-nitridation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85107162.7A CN1004762B (en) | 1985-09-26 | 1985-09-26 | Controlled deep ion-nitridation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85107162A CN85107162A (en) | 1987-06-03 |
| CN1004762B true CN1004762B (en) | 1989-07-12 |
Family
ID=4795493
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85107162.7A Expired CN1004762B (en) | 1985-09-26 | 1985-09-26 | Controlled deep ion-nitridation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1004762B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105695922A (en) * | 2014-11-25 | 2016-06-22 | 上海新力动力设备研究所 | Surface glow ion nitriding method of 30Cr3SiNiMoVA steel |
| CN105887000A (en) * | 2016-06-08 | 2016-08-24 | 连云港江南精工机械有限公司 | Nitriding heat treatment method of die-casting machine accessory |
| CN106756769A (en) * | 2016-12-09 | 2017-05-31 | 贵州群建精密机械有限公司 | A kind of antifatigue nitriding method of engine of heavy-duty car timing gears |
| CN112159951B (en) * | 2020-10-26 | 2022-12-09 | 杭州汽轮动力集团股份有限公司 | Preparation process of water erosion resistant layer of turbine titanium alloy blade |
| CN114990474A (en) * | 2022-05-05 | 2022-09-02 | 圣戈班管道系统有限公司 | Manufacturing method of wear-resistant belt pulley of centrifugal machine in high-dust environment |
-
1985
- 1985-09-26 CN CN85107162.7A patent/CN1004762B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85107162A (en) | 1987-06-03 |
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