CN1109124C - Surface metallurgical technology to precipitate hardened stainless steel - Google Patents
Surface metallurgical technology to precipitate hardened stainless steel Download PDFInfo
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- CN1109124C CN1109124C CN98119059A CN98119059A CN1109124C CN 1109124 C CN1109124 C CN 1109124C CN 98119059 A CN98119059 A CN 98119059A CN 98119059 A CN98119059 A CN 98119059A CN 1109124 C CN1109124 C CN 1109124C
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Abstract
The present invention relates to a surface metallurgical technology for precipitating hardened stainless steel, particularly to a solid surface metallurgical technology for forming and precipitating the hardened stainless steel on the surfaces of ordinary metal materials, which belongs to the category of metal surface metallurgy. The present invention is characterized in that firstly, a high alloy layer is formed on the metal surface by utilizing the double-layer glowing ion infiltration metal technology; then, the metal surface metallurgical technology dissolves solid and treats time efficiency to achieve the performance requirement for precipitating the hardened stainless steel. The technology is capable of saving large numbers of valuable alloy elements, and has the characteristics of convenient processing, simple technology, low cost and good performance.
Description
A kind of method at workpiece surface formation precipitation hardening stainless layer infiltration layer of the present invention belongs to the category of surface metallurgic.It particularly is a kind of solid state surface metallurgical technology of PH Stainless Steel.
The present PH Stainless Steel of using is solidified and is formed through solid solution and ageing treatment to solid state crystallization by liquid state by smelting process.
In the aircraft industry of develop rapidly, many component surface working temperatures are very high, must satisfy certain intensity requirements (σ
bAt 1500MN/m
2More than) and structure on high specific tenacity (intensity/proportion) is arranged, because of the specific tenacity of aluminium alloy and titanium alloy higher, so on aircraft industry, obtain bigger application.But aluminium alloy is at 150 ℃, and titanium alloy all significantly reduces in its specific tenacity more than 450 ℃, and titanium alloy costs an arm and a leg complex process.PH Stainless Steel is utilized intermetallic compound Ni
3Al, Ni
3Ti, Ni
3Mo, AB
2(Laplace phase), x phase precipitation hardening can obtain high intensity (σ
bCan reach 2000MN/m
2).Therefore this precipitation hardening ultrahigh-strength steel obtains widespread use aspect aircraft industry.
In the PH Stainless Steel of using at present, only require that in many aspects the steel surface has high performance, can satisfy service requirements.Yet since this steel vacuum metling moulding, whole whole high alloy manufacturings, and complex process, and cost height cause the waste of many valuable alloying elements.
Existing laid-open U.S. Patents, the patent No. is 4,520,268, relates to a kind of surface-alloying process, promptly only emphasizes to infiltrate alloying element at matrix surface, and technical finesse is not subsequently narrated.Disclosed in addition Chinese patent CN87104358.0 utilizes double glow plasma surface alloying technique to form the high alloy layer to carry out carburizing, quench treatment later on.Its strengthening mechanism realizes by carbide.
A kind of method purpose at workpiece surface formation precipitation hardening stainless layer infiltration layer of the present invention is to utilize double glow plasma surface alloying technique or other surface metallurgical technology of having invented, at first infiltrate alloying element, form surface alloying layer on the cheaper iron surface of price; Carry out solid solution and timeliness subsequently and handle, make surface alloying layer reach higher intensity and hardness, thereby satisfy when using performance requriements the surface.
The present invention is a kind of to form the method for precipitation hardening stainless layer infiltration layer at workpiece surface, is will insert desire co-diffusioning alloy element in the enclosed vacuum container to form source electrode, by the workpiece of alloying element as negative electrode, public anode and auxiliary cathode.Be furnished with two cover adjustable direct supply of 0～1500V or the adjustable direct current pulse power sources of 0～1500V between negative electrode, source electrode and anode, the final vacuum of vacuum vessel is not less than 10
-1Pa charges into rare gas element (argon gas, nitrogen) during work, operating air pressure is at 5～1333Pa, and the metallic cementation temperature is 900～1000 ℃ during work, voltage between negative electrode and the anode-400～-1500V, voltage between source electrode and the anode-900～-1500V.The invention is characterized in that the hollow cathode effect that utilizes in the glow discharge heats metallic cementation, and form a high alloy layer at workpiece surface, alloy layer composition scope is: Cr:13～25%; Ni:0.2～10%; Co:12～25%; Mo:1～5%; Al:0～3%; Ti:0～1%; Cu:0～5%; V:0～1%; Nb:0～1%; Ta:0～1%; Carry out 800～1100 ℃ solid solution and 300～500 ℃ ageing treatment subsequently, make alloying element in the alloy layer with Ni
3Al, Ni
3Ti, Ni
3Mo, AB
2(Laplace phase), x phase, Fe
2The form disperse of Mo intermetallic compound is evenly slightly separated out, and forms precipitation hardening stainless layer infiltration layer at workpiece surface.
Be provided with negative electrode, anode, auxiliary cathode and source electrode in workpiece places among the present invention, can charge into again in the time of can being evacuated and working in the auxiliary cathode cavity in the container of rare gas element medium (argon gas, nitrogen).Between workpiece and the workpiece, between workpiece and the auxiliary cathode, between workpiece and the source electrode, the distance between source electrode and the auxiliary cathode between 10～20mm to produce equi-potential or non-equi-potential hollow cathode effect.The desire co-diffusioning alloy element of forming source electrode refers to molybdenum, vanadium, chromium, cobalt, titanium, aluminium, tantalum, nickel, niobium, copper alloy element.Oozed the steel that workpiece material is carbon containing≤0.10% among the present invention, steel alloy, nickel-base alloy and titanium base alloy.Being formed alloy layer by the workpiece surface of alloying element, should be intermetallic compound through the precipitated phase of solid solution and ageing treatment rear surface alloy layer, and what separate out with other precipitation hardening steel is alloy carbide, and alloy nitride is different.This shows because surface-alloying process and subsequent disposal technology are made up effectively, thereby make technology have advanced person's characteristics.
The workpiece of art breading of the present invention can satisfy the situation of having relatively high expectations for surface property, for some not only surface but also heart portion all require high-intensity workpiece, can at first select the base material of higher-strength to carry out treatment process of the present invention again and can reach its service requirements.
Of the present inventionly specifically execute real process and finish like this:
As negative electrode, desire co-diffusioning alloy element is as source electrode with workpiece, and auxiliary cathode is hollow, can be the barrel-shaped of square, garden shape or other shape.Place one can be evacuated and can charge into rare gas element them with in the sealed vessel that forms certain gaseous tension.This pressurized vessel final vacuum is not less than 10
-1Pa, can charge into certain gaseous media argon gas during work, operating air pressure is at 5～1333Pa, and the adjustable direct supply of two covers, the 0～1500V that is disposed or high-pressure pulse direct current source are connected (two common anodes of power supplys) respectively with negative electrode, source electrode and anode in the vacuum vessel.When workpiece is placed, require between the workpiece surface, 10～20mm apart between workpiece surface and the auxiliary cathode surface, between source electrode surface and the cathode surface, between source electrode surface and the auxiliary cathode surface.Source electrode is made up of desire co-diffusioning alloy element molybdenum, chromium, cobalt, nickel, aluminium element.The imitated workpiece shape of its shape is parallel opposed with it.In operating air pressure and operating voltage range, workpiece (negative electrode) and workpiece, workpiece and auxiliary cathode, workpiece and source electrode, source electrode and source electrode produce the intensive hollow cathode discharge between source electrode and the auxiliary cathode.Enforcement parameter cathode potential of the present invention is-450V that the current potential of source electrode is-1200V.The composition of the 3 kinds of precipitation hardening stainless layer infiltration layers of matrix surface formation behind double-layer metallic glow ion cementation is as follows:
Sample 1:Cr:14.5%, Ni:8%, Mo:2.5%, Al:1%
Sample 2:Cr:12%, Ni:4.5%, Co:12.5%, Mo:5%
Sample 3:Cr:15%, Ni:0.2%, Co:20%; Mo:3%
In order to form surperficial high performance precipitation hardening stainless layer infiltration layer, after formation contains cobalt, molybdenum, chromium, nickel, aluminium high alloy layer, carry out follow-up solution treatment and timeliness and handle.Solid solution temperature is 800～1100 ℃, and aging temperature is 300～500 ℃.Make the processed workpiece top layer reach PH Stainless Steel hardness and performance requriements by solid solution and ageing treatment.
Present embodiment hardened precipitated phase is intermetallic compound Ni
3Mo, Ni
3Ti, Ni
3Al, AB
2And Fe
2Mo.
Claims (3)
1. method that forms precipitation hardening stainless layer infiltration layer at workpiece surface, form source electrode with inserting desire co-diffusioning alloy element in the enclosed vacuum container, by the workpiece of alloying element as negative electrode, public anode and auxiliary cathode, be furnished with the adjustable direct current pulse power source of two cover 0～1500V between negative electrode, source electrode and anode, the final vacuum of vacuum vessel is not less than 10
-1Pa, charge into rare gas element during work, operating air pressure 5～1333Pa, 900～1000 ℃ of workpiece metallic cementation temperature, voltage between negative electrode and the anode-400～-1500V, source electrode and anode voltage-900～-1500V, it is characterized in that utilizing the hollow cathode effect in the glow discharge to heat metallic cementation and form a high alloy layer, alloy layer composition range: Cr:13～25% at workpiece surface; Ni:0.2～10%; Co:12～25%; Mo:1～5%; Al:0～3%; Ti:0～1%; Cu:0～5%; V:0～1%; Nb:0～1%; Ta:0～1%; Carry out 800～1100 ℃ solid solution and 300～500 ℃ ageing treatment subsequently, make alloying element in the alloy layer with Ni
3Al, Ni
3Ti, Ni
3Mo, AB
2(Laplace phase), x phase, Fe
2The form disperse of Mo intermetallic compound is evenly slightly separated out, and forms precipitation hardening stainless layer infiltration layer at workpiece surface.
2. according to the method for claim 1, in placing, workpiece is provided with negative electrode, anode, auxiliary cathode and source electrode, work can be evacuated and in the time can charge into auxiliary cathode cavity in the container of rare gas element medium argon again, between workpiece and the workpiece, between workpiece and the auxiliary cathode, between workpiece and the source electrode, distance between source electrode and the auxiliary cathode is between 10～20mm, to produce equi-potential or non-equi-potential hollow cathode effect, the desire co-diffusioning alloy element of forming source electrode is meant molybdenum, chromium, vanadium, cobalt, titanium, aluminium, tantalum, nickel, niobium, copper alloy element.
3. according to the method for claim 1, oozed steel, steel alloy, nickel-base alloy and titanium base alloy that workpiece material is carbon containing≤0.10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98119059A CN1109124C (en) | 1998-10-14 | 1998-10-14 | Surface metallurgical technology to precipitate hardened stainless steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98119059A CN1109124C (en) | 1998-10-14 | 1998-10-14 | Surface metallurgical technology to precipitate hardened stainless steel |
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| Publication Number | Publication Date |
|---|---|
| CN1214374A CN1214374A (en) | 1999-04-21 |
| CN1109124C true CN1109124C (en) | 2003-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98119059A Expired - Fee Related CN1109124C (en) | 1998-10-14 | 1998-10-14 | Surface metallurgical technology to precipitate hardened stainless steel |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT410986B (en) * | 2001-12-19 | 2003-09-25 | Silhouette Int Schmied Ag | SPECTACLE FRAME |
| CN100434565C (en) * | 2005-12-31 | 2008-11-19 | 武汉科技大学 | Process for preparing anti-bacteria stainless steel by double-layer glowing method |
| US8034197B2 (en) | 2007-06-19 | 2011-10-11 | Carnegie Mellon University | Ultra-high strength stainless steels |
| CN101838793A (en) * | 2010-04-03 | 2010-09-22 | 桂林电子科技大学 | Surface ferrite stainless steel and preparation method thereof |
| US9963757B2 (en) | 2013-12-02 | 2018-05-08 | Dow Global Technologies Llc | Precipitation hardening of tantalum coated metals |
| CN104109842A (en) * | 2014-07-22 | 2014-10-22 | 桂林电子科技大学 | Surface hafnium-permeated+carburized high-temperature-resistant stainless steel and preparation method thereof |
| CN106381474B (en) * | 2016-08-31 | 2019-01-22 | 江苏华力金属材料有限公司 | The preparation method of stainless steel surface composite anti-wear coating |
| US11692232B2 (en) * | 2018-09-05 | 2023-07-04 | Gregory Vartanov | High strength precipitation hardening stainless steel alloy and article made therefrom |
| CN115537505A (en) * | 2022-11-18 | 2022-12-30 | 太原科技大学 | Method for accelerating precipitation speed of copper-rich phase of copper-containing steel by electric pulse |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047705A (en) * | 1989-05-30 | 1990-12-12 | 太原工业大学 | Technology of coating ion metal-infiltration on surface of metallic part |
| CN1089664A (en) * | 1993-01-06 | 1994-07-20 | 长春市华光热处理技术研究所 | Metallized cutting tool material and carburizing tech |
| CN1110332A (en) * | 1995-03-20 | 1995-10-18 | 长春市华光热处理技术研究所 | Postheating treatment process after metallic cementation |
-
1998
- 1998-10-14 CN CN98119059A patent/CN1109124C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047705A (en) * | 1989-05-30 | 1990-12-12 | 太原工业大学 | Technology of coating ion metal-infiltration on surface of metallic part |
| CN1089664A (en) * | 1993-01-06 | 1994-07-20 | 长春市华光热处理技术研究所 | Metallized cutting tool material and carburizing tech |
| CN1110332A (en) * | 1995-03-20 | 1995-10-18 | 长春市华光热处理技术研究所 | Postheating treatment process after metallic cementation |
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| CN1214374A (en) | 1999-04-21 |
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