CN100500940C - surface laser alloyed precipitation hardening stainless steel and its preparation process and application - Google Patents
surface laser alloyed precipitation hardening stainless steel and its preparation process and application Download PDFInfo
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- CN100500940C CN100500940C CNB2006100528997A CN200610052899A CN100500940C CN 100500940 C CN100500940 C CN 100500940C CN B2006100528997 A CNB2006100528997 A CN B2006100528997A CN 200610052899 A CN200610052899 A CN 200610052899A CN 100500940 C CN100500940 C CN 100500940C
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Abstract
The invention relates to a precipitation hardening stainless steel material with laser alloying surface manufacturing technology and its application. It is made up precipitation hardening stainless steel basal body and alloying coating which is processed by alloying technology for paint contains W, Co, Cr, Ni alloy powder. The processed precipitation hardening stainless steel remains original better comprehension mechanical property, and has high surface hardness. Thus it has wide application range. The 17-4PH stainless steel is fit for making turbine blade.
Description
Technical field
The present invention relates to a kind of PH Stainless Steel material, relate in particular to of PH Stainless Steel material and preparation technology and the application of a kind of surface through laser alloying.
Background technology
Laser alloying is to utilize laser that base metal surface is melted, add alloying element simultaneously, with the matrix is solvent, alloying element is a solute, constitute the quite high and quite uniform alloy layer of one deck concentration on the matrix, thereby reach desired property such as wear-resisting, anti-corrosion, high temperature resistant, anti-oxidant.Utilize laser surface alloying technology to prepare wear-resisting, anti-corrosion, resistant to elevated temperatures surface alloy in poor, the low-cost base metal surface of some surface propertys, be used to replace expensive whole alloy, save noble metal material and strategic material, make cheap alloy obtain to use widely, thereby reduce cost significantly.
1964, F.E.Cumningham at first adopts ruby laser to develop the laser alloying technology, from then on, follow the exploitation of the perfect performance and the high power laser of Laser Devices, the laser surface alloying technology has obtained developing rapidly, and especially since the eighties, European and American countries has been expressed very big expectation to the laser surface alloying technology, drop into great amount of manpower and material resources and financial resources, carried out comparatively extensive studies.In China, the research work of laser surface alloying in recent years is also very active.For the development in an all-round way of this technology, people are extensive studies having carried out deeply a large amount of aspect the proportioning of the selection of matrix metal material and alloy element.Base material not only relates to ferrous materials such as carbon steel, steel alloy, rapid steel, stainless steel, die steel and cast iron, but also relate to nonferrous materialss such as Al, Ti, Ni, Cu, Mg and alloy thereof, and their carbide, oxide compound, nitride and boride etc.
The 17-4PH stainless material is a kind of PH Stainless Steel material of high comprehensive performance, but during the application on turbine blade, its surface hardness, anti-erosion property are all not enough.Any report to this type of PH Stainless Steel material laser surface-alloying process is not also arranged in the prior art.
Summary of the invention
Not high in order to solve 17-4PH surface of stainless steel hardness, the technological deficiency of anti-erosion property difference, an object of the present invention is to provide a kind of when can improve the precipitate hardened stainless steel surface hardness greatly, the PH Stainless Steel material that can keep the original every good index of matrix has again been widened the use range of PH Stainless Steel material greatly.
Another object of the present invention provides above-mentioned PH Stainless Steel preparation methods.
In order to realize first purpose of the present invention, the present invention has adopted following technical scheme:
A kind of PH Stainless Steel of surface laser alloying is made up of PH Stainless Steel matrix and alloying coat, and described alloy-coated layer is obtained through the laser alloying art breading by the coating that contains W, Co, Cr, Ni alloy powder.
As preferred version: the weight percent of W, Co, Cr, Ni is in the described alloy powder: W 50～60%, Co 15～20%, Cr 15～20%, Ni 7～10%.
As preferred version: also comprise Fe 0.5～2%, Si 1.2～1.5% in the described alloy powder.
As preferred version: the thickness of surface alloying layer is 40～80 μ m.
As preferred version: described PH Stainless Steel matrix is the 17-4PH stainless material.
In order to realize second purpose of the present invention, the present invention has adopted following technical scheme:
The preparation technology of the PH Stainless Steel of the described a kind of surface laser alloying of above-mentioned each scheme, this technology comprises following processing step:
1) the pending surface of usefulness clean-out system washing and precipitating hardening stainless steel, drying;
2) apply the coating that one deck contains W, Co, Cr, Ni alloy powder, form pre-coat layer;
3) after the pre-coat layer drying, be 10 with power density
3～10
4W/cm
2, sweep velocity is that the laser beam of 5～10mm/s is handled, the treatment zone of blanketing with inert gas simultaneously forms the alloying coat at the precipitate hardened stainless steel face.
As preferred version: above-mentioned step 2) thickness of described pre-coat layer is 0.1～0.5mm.
As preferred version: the described clean-out system of above-mentioned step 1) is that purity is 98% acetone, and cleaning needs to repeat twice.
As preferred version: described PH Stainless Steel matrix is the 17-4PH stainless material, and used laser apparatus is CO in the above-mentioned step 3)
2Laser apparatus, its wavelength are 10.6 μ m, and the power density of laser is 10
3～10
4W/cm
2, sweep velocity is 5～10mm/s, and defocusing amount is 0, and spot size is (10～16) * 2mm
2, the vertical radiation treatment of light beam surface.
The invention has the advantages that: under the prerequisite that does not influence the PH Stainless Steel substrate performance, obtained the alloy-coated layer of high rigidity at the precipitate hardened stainless steel face, and this alloy layer surface quality is good, flawless is shaped, and need not aftertreatment.The surface hardness of alloy layer is up to HV
0.21160, average hardness can reach HV
0.2800, hardened-depth is about 50 μ m.Need not aftertreatment with the workpiece after the art breading of the present invention, and realize that this technology is convenient relatively, promote easily, can realize high-level efficiency, large-scale application in batches.
The present invention also provides the application of 17-4PH stainless material on the preparation turbine blade in addition.Owing to adopted above-mentioned technical scheme, thoroughly solved the not high shortcoming of 17-4PH Stainless Steel Watch surface hardness, widened the use range of this type of PH Stainless Steel greatly, particularly on the preparation turbine blade, improve the anti-erosion property of blade leading edge, improve the working life of this blade greatly, to improving the security of whole Steam Turbine, prolonging overhaul period has very positive effect.
Description of drawings
Fig. 1 is a Laser Alloying Treatment synoptic diagram of the present invention.
Embodiment
Embodiment one:
Below in conjunction with Fig. 1 the embodiment of the invention being done one describes in detail: 1 is laser beam, and 2 is shielding gas, and 3 is workpiece, and 4 is laser beam direction of motion.Workpiece material is the 17-4PH stainless steel, handles through solid solution (1020～1060 ℃) and timeliness (500～580 ℃), is a kind of PH Stainless Steel of high comprehensive performance.The surface is after 98% acetone cleans 2 times, and precoating one deck width is that 16mm, thickness are the alloy coat of 0.4mm, contains W 52%, Co 18%, Cr 20%, Ni 8%, Fe 1%, Si 1% in the alloy coat, to be dried after, carry out laser treatment.
The laser beam source is CO
2Laser apparatus, its wavelength are 10.6 μ m, and power density is 7.8 * 10
3W/cm
2, laser vertically shines in workpiece surface.Wherein hot spot is of a size of 16 * 2mm, and defocusing amount is 0.During processing, it is static that workpiece keeps, and laser beam is with the speed motion of 9mm/s, and shielding gas is 30 ° with light beam and sends at the front end of direction of motion.
17-4PH stainless steel after handling according to this technology, the surface has obtained the alloy layer of one deck extreme hardness, and its hardness obviously improves than matrix, and the thickness of alloying layer is 50 μ m, defectives such as flawless, pore, and surface quality is good.Alloy layer is the superfine non-equilibrium microstructure of crystal grain, and forms the ideal metallurgical binding with matrix surface.
The present invention can make the 17-4PH stainless steel reach high surface hardness that original thermal treatment process is beyond one's reach, and does not influence every mechanical property of matrix.Easy control, the workpiece that can be adapted to process different shapes, different thickness and need different performance of being easy to of technology.
Embodiment two:
In material is 17-4PH, and original hardness is HV
0.2380 QD238 convex side of blade cleans and applies one deck width is that 18mm, thickness are the alloy coat of 0.5mm, contains W 56%, Co 20%, Cr 15%, Ni 7%, Fe 0.8%, Si 1.2% in the alloy coat.Press the vane type line programming, its laser processing technique parameter is a power density 8.3 * 10
3W/cm
2, V=8mm/s, spot size is 12 * 2mm; After laser treatment, divide and get at 5 to obtain hardness be HV
0.2: 882,898,995,876,781, the alloying layer depth is the alloying layer of 60 μ m.Blade through this method is handled uses through installation, and the result shows that its anti-steam erosion performance obviously improves, and safe and reliable.
Claims (8)
1. the PH Stainless Steel of a surface laser alloying, it is characterized in that: be made up of PH Stainless Steel matrix and alloying coat, the alloy-coated layer is obtained through the laser alloying art breading by the coating of alloy powder; Alloy powder is made up of following component by weight percentage: W 52～60%, Co 15～20%, Cr 15～20%, Ni 7～10%, Fe 0.5～2%, Si 1.2～1.5%.
2. the PH Stainless Steel of a kind of surface laser alloying according to claim 1 is characterized in that: the thickness of surface alloying layer is 40～80 μ m.
3. the PH Stainless Steel of a kind of surface laser alloying according to claim 1 and 2 is characterized in that: the PH Stainless Steel matrix is the 17-4PH stainless material.
4. the application of the PH Stainless Steel of a kind of surface laser alloying according to claim 3 on the preparation turbine blade.
5. the preparation technology of the PH Stainless Steel of a kind of surface laser alloying according to claim 1 and 2 is characterized in that this technology comprises following processing step:
1) the pending surface of usefulness clean-out system washing and precipitating hardening stainless steel, drying;
2) apply the coating that one deck contains W, Co, Cr, Ni alloy powder, form pre-coat layer;
3) after the pre-coat layer drying, be 10 with power density
3～10
4W/cm
2, sweep velocity is that the laser beam of 5～10mm/s is handled, the treatment zone of blanketing with inert gas simultaneously forms the alloying coat at the precipitate hardened stainless steel face.
6. the preparation technology of the PH Stainless Steel of a kind of surface laser alloying according to claim 5 is characterized in that: step 2) thickness of described pre-coat layer is 0.1～0.5mm.
7. the preparation technology of the PH Stainless Steel of a kind of surface laser alloying according to claim 5 is characterized in that: the described clean-out system of step 1) is that purity is 98% acetone, and cleaning needs to repeat twice.
8. the preparation technology of the PH Stainless Steel of a kind of surface laser alloying according to claim 5 is characterized in that: described PH Stainless Steel is the 17-4PH stainless material, and used laser apparatus is CO in the above-mentioned step 3)
2Laser apparatus, its wavelength are 10.6 μ m, and the power density of laser is 10
3～10
4W/cm
2, sweep velocity is 5～10mm/s, and defocusing amount is 0, and spot size is (10～16) * 2mm
2, the vertical radiation treatment of light beam surface.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100528997A CN100500940C (en) | 2006-08-11 | 2006-08-11 | surface laser alloyed precipitation hardening stainless steel and its preparation process and application |
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| CNB2006100528997A CN100500940C (en) | 2006-08-11 | 2006-08-11 | surface laser alloyed precipitation hardening stainless steel and its preparation process and application |
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| CN100500940C true CN100500940C (en) | 2009-06-17 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101021013B (en) * | 2007-03-21 | 2010-12-08 | 浙江工业大学 | Method for preparing wear-resistant nanocomposite coating on metal substrate surface |
| CN101956198B (en) * | 2010-10-13 | 2012-02-29 | 姚建华 | Surface composite strengthening technology for precipitation hardening stainless steel and precipitation hardening stainless steel material |
| CN105441777A (en) * | 2015-02-12 | 2016-03-30 | 华中科技大学 | High-strength high-toughness metal prefabricated material and preparation method thereof |
| CN109666776B (en) * | 2018-12-19 | 2020-12-25 | 徐工集团工程机械股份有限公司 | Hardening process for surface of low-carbon steel wheel body in road roller grinding wheel |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1603425A (en) * | 2003-09-29 | 2005-04-06 | 浙江工业大学 | A metal laser deep quenching process |
| CN1603052A (en) * | 2003-09-29 | 2005-04-06 | 浙江工业大学 | A laser strengthening process for metal blades |
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2006
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1603425A (en) * | 2003-09-29 | 2005-04-06 | 浙江工业大学 | A metal laser deep quenching process |
| CN1603052A (en) * | 2003-09-29 | 2005-04-06 | 浙江工业大学 | A laser strengthening process for metal blades |
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