CN103160664A - Method for performing surface strengthening treatment on stainless steel welding joint - Google Patents
Method for performing surface strengthening treatment on stainless steel welding joint Download PDFInfo
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- CN103160664A CN103160664A CN2013100901662A CN201310090166A CN103160664A CN 103160664 A CN103160664 A CN 103160664A CN 2013100901662 A CN2013100901662 A CN 2013100901662A CN 201310090166 A CN201310090166 A CN 201310090166A CN 103160664 A CN103160664 A CN 103160664A
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Abstract
The invention discloses a method for performing surface strengthening treatment on a stainless steel welding joint, namely, the stainless steel welding joint is treated by using a surface mechanical grinding technology, ultra-fine grains are prepared on the surface of the stainless steel welding joint, and then the surface strengthening treatment can be performed by adopting different manners according to the different shapes and the different sizes of stainless steel welding pieces to be treated. The surface of the stainless steel welding joint which is treated by using the method for performing the surface strengthening treatment on the stainless steel welding joint can not have the condition of plastic deformation, the surface hardness of the treated stainless steel welding joint can be effectively improved by grain refining and residual compressive stress, the Vickers hardness of the strengthened surface can be improved by 35-110%, and simultaneously, the roughness of the surface of the treated welding joint can be reduced.
Description
Technical field
The invention belongs to metal surface enhanced processing technology field, relate to a kind of method to the stainless steel welded joint intensive treatment.
Background technology
Austenitic stainless steel is widely used in chemistry, automobile making, nuclear industry because it has good toughness, ductility and erosion resistance.In actual applications, stainless steel requires welding usually.Yet any welding technique all can be brought out the variation of some metallurgical structures, as the crystal grain misgrowth of microsegregation, secondary phase precipitation, hole, solidification cracking and heat affected zone.These variations often make its physical strength reduction, stress corrosion resistant ability, are easy to corrosion.For example, traditional electric-arc welding often causes grain coarsening, and produces the carbide of rich chromium along crystal boundary in the heat affected zone, is easy to the intergranular corrosion fracture, and plasticity significantly reduces simultaneously.The commissure Quality Down has not only affected the work-ing life of material, also limits Application Areas simultaneously.But because the welding zone is complex-shaped, welding region is little, and enhancement method commonly used is inapplicable or strengthening effect is not obvious and make.
The method of improving at present property of welded joint mainly contains postweld heat treatment, local reinforcement, Subzero cooling strengthening processing method and shock peening treatment process.
For postweld heat treatment, with the homogenizing welding line structure, can recover intensity to a certain degree, increase by a small margin 3-5%; Be applicable to the performance recovery of small-sized weldment.
For the local reinforcement, such as, Chinese invention patent CN200620007473.5 discloses a kind of ultra pottery porcelain corrosion protection coating of strengthening the weld of repairing, can strengthen and protect appearance corrosion-prone weld.But the raising to intensity is not obvious.
For Subzero cooling strengthening processing method, Chinese invention patent CN200910075367.9 and CN201110057835.7 disclose aluminium alloy and magnesium alloy have been carried out cooled with liquid nitrogen deep cooling intensive treatment 4-6h, can make alloy rigidity increase 8-12%.
For the shock peening treatment process, Chinese invention patent CN102127630A has introduced the treatment process that adopts laser impact intensified X70 Pipeline Welded Joints, has effectively increased the anti-H of Pipeline Welded Joints
2S stress corrosion and hydrogen induced cracking (HIC) performance.Chinese invention patent CN200910027130.3 discloses a kind of composite impact material surface strengthening method based on laser blast wave and emp and device, can prevent that material surface from producing harmful residual tension, eliminate welding stress and improve stress corrosion resistant.But because laser blast wave is a quick and unsettled Thermal Cycling, so larger thermograde appears around weld seam, when obtaining crystal grain thinning and residual compressive stress, and welding line joint surface generation viscous deformation.
In sum, the currently used method of improving the mechanical property of stainless steel welded joint all exists mechanical property to improve not obvious problem, make hardness improve as postweld heat treatment and only be 3-5%, the sub-zero treatment mode makes hardness only improve 8-12%, and there is the technical problem of seam deformation etc. in laser shock peening method.
Summary of the invention
The objective of the invention is to provide in order to solve above-mentioned technical problem a kind of method of stainless steel welded joint surface Hardening Treatment.
Know-why of the present invention
The surface mechanical attrition treatment technology is a kind of very effective surface strengthening technology.By controlling the energy of bullet, continuous multi-faceted shock sample surfaces and obtain Ultra-fine Grained and ultra-fine twin structure finally makes the mechanical property of material significantly improve, as higher hardness and intensity, and the friction and wear behavior of enhancing etc.For the performance requriements of different shapes, large small sample specific region, can realize by adopting different processing modes.
Technical scheme of the present invention
A kind of method of stainless steel welded joint surface Hardening Treatment, namely utilize surface mechanical attrition technical finesse stainless steel welded joint, prepare Ultra-fine Grained and ultra-fine twin structure on the surface of stainless steel welded joint, thereby make it have high surface hardness and improve the weld region surfaceness.
The method of above-mentioned a kind of stainless steel welded joint surface Hardening Treatment specifically comprises the steps:
(1), pending stainless steel weldment is cleaned with distilled water and dehydrated alcohol successively, after drying, pending;
(2), different according to pending stainless steel weldment shape and size, carry out in the following way surface Hardening Treatment:
Pending stainless steel weldment size is less than 10mm, directly put into impulse chamber, impact the steel alloy lid together with bullet, can realize whole the reinforcement, the shock height 3-12mm of intensive treatment process bullet, bullet diameter used is 0.3～3mm, and the material of bullet can be pottery, stainless steel, hard alloy steel or bearing steel etc., and bullet density is 1～8/mm
2, treatment temp is-80～23 ℃, time 0.5～30min;
Pending stainless steel weldment is of a size of the tabular sample greater than 10mm, select the straight line step mode, adjust and impact window, the intensive treatment process is completed automatically, the shock height 3-12mm of intensive treatment process bullet, bullet diameter used is 0.5～8mm, and the material of bullet is pottery, stainless steel, hard alloy steel or bearing steel etc., and bullet density is 1～6/mm
2, treatment temp-80～23 ℃, time 0.5～40min;
Pending stainless steel weldment is of a size of the tubular specimen greater than 10mm, select rotary mode, adjust and impact window, the intensive treatment process is completed automatically, the shock height 3-12mm of intensive treatment process bullet, bullet diameter used is 0.5～8mm, and the material of bullet is pottery, stainless steel, hard alloy steel or bearing steel etc., and bullet density is 1～8/mm
2, treatment temp-80～23 ℃, time 0.5～40min.
(3), after step (2) finishes dealing with, sampling is cleaned with dehydrated alcohol, oven dry namely gets the stainless steel welded joint of surface Hardening Treatment.
After above-mentioned stainless steel welded joint surface Hardening Treatment, the surface of the stainless steel welded joint of gained forms Ultra-fine Grained and ultra-fine twin structure.
Further, stainless steel steel welded joint surface does not produce viscous deformation after surface strengthening, and grain refining and residual compressive stress are improved the surface hardness of welding joint effectively, reduce simultaneously the roughness of face of weld.
Beneficial effect of the present invention
A kind of stainless steel welded joint method for surface hardening of the present invention, owing to adopting surface mechanical attrition treatment, in treating processes, the surface does not produce viscous deformation without thermograde, welding joint, and namely weld seam is indeformable.
A kind of stainless steel welded joint method for surface hardening of the present invention, owing to having adopted surface mechanical attrition treatment technology refinement welding joint place weave construction, realize that the welding line joint surface prepares Ultra-fine Grained and ultra-fine twin structure, compare with the postweld heat treatment method, namely do not need the stainless steel weldment is heat-treated, and strengthening effect is remarkable, the Vickers' hardness on surface can improve 35-110%, simultaneously the roughness at welding joint place reduces after treatment, and the surface has residual tension to change residual compressive stress into.
A kind of stainless steel welded joint method for surface hardening of the present invention, technique is simple, and the treatment time is short, shows that strengthening effect is obvious, is applicable to the intensive treatment of the weld face of various size and shape.
Description of drawings
The opticmicroscope figure on the 304 stainless steel plate surfaces that Fig. 1 a, embodiment 2 are used;
The opticmicroscope figure on the surface of 304 stainless steel plates after surface Hardening Treatment that Fig. 1 b, embodiment 2 are used;
The surperficial Vickers' hardness distribution situation of 304 its case depths before and after the stainless steel plate surface Hardening Treatment that Fig. 1 c, embodiment 2 are used.
Specific embodiment
Also by reference to the accompanying drawings the present invention is further set forth below by specific embodiment, but do not limit the present invention.
In various embodiments of the present invention employing surface mechanical attrition treatment method, equipment used is making Nano surface of metal material trier (Chengdu, Sichuan new lattice Science and Technology Ltd.).
Embodiment 1
A kind of method of stainless steel welded joint surface Hardening Treatment specifically comprises the steps:
Laser welding 304 Stainless Steel Valves that are 8mm with diameter clean with distilled water and dehydrated alcohol successively, put into the impulse chamber of making Nano surface of metal material trier after drying, and putting into bullet is that diameter is the Ceramic Balls of 0.3mm, and bullet density is 1/mm
2Adjust shock height 10mm, with carrying out surface Hardening Treatment after the stainless-steel sheet sealing, control 23 ℃ of room temperatures, frequency 20KHz, time 0.5min in the surface Hardening Treatment process, after the surface Hardening Treatment experiment is completed, use the ethanol clean surface, dry with blower, namely get surperficial 304 Stainless Steel Valves through intensive treatment.
The surface of above-mentioned gained is through 304 Stainless Steel Valves of intensive treatment, (JEM 2010 to adopt transmission electron microscope, Japan JEOL Electronics Co., Ltd) observe, its surface, commissure average grain size is 450nm, show intensive treatment after its surperficial grain-size reach ultra-fine yardstick.
Use respectively before and after 304 above-mentioned Stainless Steel Valve surface Hardening Treatment and adopt Vickers' hardness tester (Zwick/Roell universal hardness testing machine, Germany Zi Weike) measure the Vickers' hardness of weld face, result shows, before intensive treatment, its surperficial Vickers' hardness is 200HV, the surperficial Vickers' hardness of its after surface Hardening Treatment can reach 290HV, namely after the method for stainless steel welded joint surface Hardening Treatment of the present invention was processed, its surperficial Vickers' hardness had improved 45%.
Use respectively through laser confocal microscope (Nikon C1 Plus laser confocal microscopy before and after 304 above-mentioned Stainless Steel Valve surface Hardening Treatment, Japan Nikon) measure surfaceness, the r.m.s. roughness Ra of sample surfaces, be reduced to 1.5mm after intensive treatment by the 9mm before being untreated, show thus, adopt stainless steel welded joint method for surface hardening of the present invention, make the roughness on the surface at welding joint place obviously reduce.
Use respectively through XRD instrument (Bruker D8 before and after 304 above-mentioned Stainless Steel Valve surface Hardening Treatment, Germany Bruker) measure the unrelieved stress at welding joint place, become residual compressive stress by the residual tension (100MPa) before being untreated, numerical value is 230MPa, has shown that thus surface mechanical attrition treatment makes weld face change stress into by tensile stress.
Embodiment 2
A kind of method of stainless steel welded joint surface Hardening Treatment specifically comprises the steps:
304 stainless steel plates of the laser welding of the wide 70mm of long 1m are cleaned with distilled water and dehydrated alcohol successively, put into the upper surface of the impulse chamber of making Nano surface of metal material trier after drying, the adjustment window size is 70mm ' 2mm, putting into bullet is that diameter is the 3mm Stainless Steel Ball, and bullet density is 1/mm
2Adjust shock height 12mm and carry out surface Hardening Treatment, 23 ℃ of surface Hardening Treatment process control temps, frequency 20KHz, straight line stepping length 68mm, time 15min, after the surface Hardening Treatment experiment is completed, use the ethanol clean surface, dry with blower, namely get surperficial 304 stainless steel plates through intensive treatment.
Surface topography before and after 304 above-mentioned stainless steel plate surface Hardening Treatment is through laser confocal microscope (Nikon C1 Plus laser confocal microscopy, Japan Nikon) scan, the microstructure figure of gained sees respectively accompanying drawing 1a and 1b, can clearly see the fan-shaped molten spot pattern of weld face in Fig. 1 a.Fig. 1 b shows that the fan-shaped molten spot of weld seam disappears after shock peening is processed, and has shown that thus the surfaceness of welding joint reduces.Concrete roughness adopts laser confocal microscope (Nikon C1 Plus laser confocal microscopy, Japan Nikon) measure, the r.m.s. roughness Ra on surface is reduced to 3mm after intensive treatment by the 9mm before intensive treatment not, show thus, adopt stainless steel welded joint method for surface hardening of the present invention, make the roughness on the surface at welding joint place obviously reduce.
(JEM 2010 through transmission electron microscope through 304 stainless steel plates of intensive treatment on the surface of above-mentioned gained, Japan JEOL Electronics Co., Ltd) observe, can find out that its surperficial average grain size is 250nm after intensive treatment, show that thus after the intensive treatment, its surperficial grain-size reaches ultra-fine size.
Use respectively Vickers' hardness tester (Zwick/Roell universal hardness testing machine before and after 304 above-mentioned stainless steel plate surface Hardening Treatment, Germany Zi Weike) measure, before result shows intensive treatment, its surperficial Vickers' hardness is 200HV, the Vickers' hardness of intensive treatment rear surface can reach 345HV, namely after the method for stainless steel welded joint surface Hardening Treatment of the present invention was processed, its surperficial Vickers' hardness had improved 72%, specifically sees shown in accompanying drawing 1c.
Embodiment 3
A kind of method of stainless steel welded joint surface Hardening Treatment specifically comprises the steps:
430 stainless steel plates that with length for 500mm is wide are the laser welding of 70mm clean with distilled water and dehydrated alcohol, put into the upper surface of the impulse chamber of making Nano surface of metal material trier after drying, the adjustment window size is 70mm ' 2mm, putting into bullet is that diameter is the 8mm Ceramic Balls, and bullet density is 4/mm
2, adjust shock height 12mm, control 23 ℃ of temperature, operating frequency 50 Hz, straight line stepping length 68mm, the time, 40min processed, after the surface treatment experiment is completed, use the ethanol clean surface, dry with blower, namely get surperficial 304 stainless steel plates through intensive treatment.
The surface of above-mentioned gained is through 304 stainless steel plates of intensive treatment, (JEM 2010 with transmission electron microscope, Japan JEOL Electronics Co., Ltd) observe, can find out that its surperficial average grain size is 350nm after intensive treatment, the twin of distance surperficial 100mm depths is of a size of 200nm, shown that thus its subsurface after the intensive treatment has formed the twin structure of ultra-fine yardstick.
Use respectively Vickers' hardness tester (Zwick/Roell universal hardness testing machine before and after 304 above-mentioned stainless steel plate surface Hardening Treatment, Germany Zi Weike) measure, before intensive treatment, its surperficial Vickers' hardness is 280HV, after intensive treatment, its surperficial Vickers' hardness can reach 378HV, namely after the method for stainless steel welded joint surface Hardening Treatment of the present invention was processed, its surperficial Vickers' hardness had improved 35%.
Embodiment 4
A kind of method of stainless steel welded joint surface Hardening Treatment specifically comprises the steps:
Be 304 stainless steel tubes of 20mm with the diameter of laser welding, clean with distilled water and dehydrated alcohol, put into the impulse chamber of making Nano surface of metal material trier after drying, two ends are fixed, select rotary mode, putting into bullet is that diameter is the 3mm bearing steel ball, and bullet density is 8/mm
2, adjust shock height 3mm, inject liquid nitrogen and be cooled to-80 ℃, control the operating frequency 20KHz of intensive treatment, rotating speed is 10r/min, and treatment time 20min is after the surface treatment experiment is completed, use the ethanol clean surface, dry with blower, namely get surperficial 304 stainless steel tubes through intensive treatment.
304 above-mentioned stainless steel tubes are after surface Hardening Treatment, (JEM 2010 with transmission electron microscope, Japan JEOL Electronics Co., Ltd) observe, can find out that its surperficial average grain size is 200nm after intensive treatment, show that thus its surface after the intensive treatment has formed the twin structure of ultra-fine yardstick.
Use respectively through Vickers' hardness tester (Zwick/Roell universal hardness testing machine before and after 304 above-mentioned stainless steel pipe surface intensive treatment, Germany Zi Weike) measure, before intensive treatment, its surperficial Vickers' hardness is 200HV, after intensive treatment, its surperficial Vickers' hardness can reach 421HV, namely after the method for stainless steel welded joint surface Hardening Treatment of the present invention was processed, its surperficial Vickers' hardness had improved 110%.
In sum, the method for a kind of stainless steel welded joint surface Hardening Treatment of the present invention can be prepared Ultra-fine Grained and ultra-fine twin structure on the surface of stainless steel welded joint, makes the surface hardness raising 35-110% at welding joint place.Simultaneously, the roughness at welding joint place reduces after treatment, and the surface has residual tension to change residual compressive stress into.
Foregoing is the basic explanation under conceiving for the present invention only, and according to any equivalent transformation that technical scheme of the present invention is done, all should belong to protection scope of the present invention.
Claims (5)
1. the method for a stainless steel welded joint surface Hardening Treatment, is characterized in that utilizing surface mechanical attrition technical finesse stainless steel welded joint, prepares Ultra-fine Grained and ultra-fine twin structure on the surface of stainless steel welded joint.
2. the method for a kind of stainless steel welded joint surface Hardening Treatment as claimed in claim 1, it is characterized in that the described surface mechanical attrition technical finesse stainless steel welded joint that utilizes, according to the difference of pending stainless steel weldment shape and size, carry out in the following way surface Hardening Treatment:
When pending stainless steel weldment size less than 10mm, directly put into the impulse chamber of making Nano surface trier, impact the steel alloy lid together with bullet, realize whole the reinforcement, intensive treatment process bullet diameter used is 0.3～3mm, and bullet density is 1～8/mm
2, treatment temp is-80～23 ℃, time 0.5～30min;
When pending stainless steel weldment shape and size are tabular sample greater than 10mm, put into the impulse chamber of making Nano surface trier, select the straight line step mode, adjust and impact window, intensive treatment process bullet diameter used is 0.5～8mm, and bullet density is 1～6/mm
2, treatment temp-80～23 ℃, time 0.5～40min;
When pending stainless steel weldment shape and size are tubular specimen greater than 10mm, put into the impulse chamber of making Nano surface trier, select rotary mode, adjust and impact window, strengthening process bullet diameter used is 0.5～8mm, and bullet density is 1～8/mm
2, treatment temp-80～23 ℃, time 0.5～40min.
3. the method for a kind of stainless steel welded joint surface Hardening Treatment as claimed in claim 2, is characterized in that described bullet material is pottery, stainless steel, hard alloy steel or bearing steel.
4. the method for a kind of stainless steel welded joint surface Hardening Treatment as claimed in claim 3, is characterized in that the frequency of impact 50-20kHz in described impulse chamber.
5. as the method for claim 4 described a kind of stainless steel welded joint surface Hardening Treatment, it is characterized in that in described impulse chamber the shock height 3-12mm of bullet.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015014319A1 (en) * | 2013-08-02 | 2015-02-05 | City University Of Hong Kong | Nanostructured-lattices produced by surface mechanical attrition treatment method |
| US9517545B2 (en) | 2013-08-02 | 2016-12-13 | Nano And Advanced Materials Institute Limited | Nanostructured-lattices produced by surface mechanical attrition treatment method |
| CN108300844A (en) * | 2018-01-24 | 2018-07-20 | 中南大学 | A kind of anti-corrosion " sandwich " structure and its construction method |
| CN108746992A (en) * | 2018-06-01 | 2018-11-06 | 河海大学常州校区 | A kind of method that laser heat treatment strengthens Pipeline Welded Joints mechanical property |
| CN109909891A (en) * | 2019-03-26 | 2019-06-21 | 北京科技大学 | Improve the surface treatment and test method of SA106B mild steel pipe material inner wall corrosion resistance |
| CN110468266A (en) * | 2018-05-10 | 2019-11-19 | 香港城市大学深圳研究院 | A kind of processing method of material |
| CN110951954A (en) * | 2019-12-25 | 2020-04-03 | 哈尔滨电气动力装备有限公司 | Surface shot blasting strengthening process method for guide vane blade of main pump of nuclear power station |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015014319A1 (en) * | 2013-08-02 | 2015-02-05 | City University Of Hong Kong | Nanostructured-lattices produced by surface mechanical attrition treatment method |
| US9517545B2 (en) | 2013-08-02 | 2016-12-13 | Nano And Advanced Materials Institute Limited | Nanostructured-lattices produced by surface mechanical attrition treatment method |
| US10253383B2 (en) | 2013-08-02 | 2019-04-09 | City University Of Hong Kong | Nanostructured-lattices produced by surface mechanical attrition treatment method |
| CN108300844A (en) * | 2018-01-24 | 2018-07-20 | 中南大学 | A kind of anti-corrosion " sandwich " structure and its construction method |
| CN110468266A (en) * | 2018-05-10 | 2019-11-19 | 香港城市大学深圳研究院 | A kind of processing method of material |
| CN108746992A (en) * | 2018-06-01 | 2018-11-06 | 河海大学常州校区 | A kind of method that laser heat treatment strengthens Pipeline Welded Joints mechanical property |
| CN109909891A (en) * | 2019-03-26 | 2019-06-21 | 北京科技大学 | Improve the surface treatment and test method of SA106B mild steel pipe material inner wall corrosion resistance |
| CN110951954A (en) * | 2019-12-25 | 2020-04-03 | 哈尔滨电气动力装备有限公司 | Surface shot blasting strengthening process method for guide vane blade of main pump of nuclear power station |
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Application publication date: 20130619 |