CN102009325B - Method for improving corrosion resistance of weld joint of hastelloy conductive roller - Google Patents
Method for improving corrosion resistance of weld joint of hastelloy conductive roller Download PDFInfo
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Abstract
The invention provides a method for improving the corrosion resistance of a weld joint of a hastelloy conductive roller in the technical field of steel production. In the method, a hastelloy corrosion-resistance layer cylinder and a roller core of the conductive roller are manufactured respectively; and the hastelloy corrosion-resistance layer cylinder and the roller core are assembled by adopting a thermal shrinking process to improve the corrosion resistance. The method is used for remarkably improving the corrosion resistance of the weld joint of the conductive roller. When the conductive roller manufactured by the method is used on a production line for 8 eight months, the weld joint corrosion is not found, the conductive roller is corroded and is off from the production line for repairing only because of surface damage of a base metal.
Description
Technical field
What the present invention relates to is a kind of method of steel production technical field, specifically is a kind of method that improves Hastelloy conductive rollers weld seam decay resistance.
Background technology
Conductive rollers is used on the galvanized steel plain sheet production line, for steel band transmits continuously power is provided.Simultaneously, form the galvanic circle as live roll and electrode, electroplate liquid, steel band etc.Conductive rollers is born the stress loading of alternation, contacts working environment with electrolyte, causes conductive rollers that stress corrosion takes place easily.In case the conductive rollers surface heavy corrosion occurs and causes surface irregularity, then need dismantle and roll off the production line, carry out Surface Machining and grind, it causes production line downtime for a moment; It two adds trade union repeatedly and causes conductive rollers surface Hastelloy layer attenuate, and reduce service life.According to the applying unit statistics, if the conductive rollers workmanship is bad, the shortest only use promptly need be dismantled and rolled off the production line in three months, carried out Surface Machining and ground; The longest use must be rolled off the production line and carried out processing grinding in 6 months.The conductive rollers corrosion mainly shows as the serious stress corrosion of welded seam area.
Retrieval through to prior art is found; Introduced anti-corrosion Hastelloy C-22 practical applications among " Hastelloy C-22 alloy " (" haas troy C-22 alloy ") HaynesInternational.INC; Comprising zinc-plated conductive rollers, have anticorrosive preferably and the corrosion cracking performance." Hastelloy conductive rollers failure Mechanism " shipbuilding technology 2008, the No.6 dissection and analysis a kind of conductive rollers failure cause of clad structure, and failure mechanism.This conductive rollers clad is selected the C-22 Hastelloy for use, opens double V-groove, through the welding of single face multilayer multiple tracks silk filling TIG method.Metallographic Analysis is found: the microscopic appearance of Hastelloy mother metal and weld seam is different, and weld seam is a columanar structure, explains that Hastelloy cylindrical shell postwelding does not pass through solution treatment, and the weld metal corrosion resistance is poor; The weld seam dissection and analysis is found: the Hastelloy cylindrical shell root of weld exists the lack of penetration and local weldering of wire burst to fall into; There is corrosion reaction product Fe in fracture surface
x(SO
4)
YAnd Cr
2(SO
4)
3, explain that the medium of Hastelloy conductive rollers generation corrosion cracking and galvanizing solution is closely related.The corrosion cracking fracture has been carried out the SEM observation, and fracture is typical stress corrosion cracking scallop+chevron style fracture apperance.
Hastelloy is single-phase austenite material; Linear expansion coefficient is big, and the Hastelloy clad can produce cross-direction shrinkage, vertically contraction and angular deformation during welding, but because the support of inner roller core; Limited the contraction distortion of Hastelloy clad; In weld seam, can form very big tensile stress, postwelding does not carry out stress-removal to be handled, and constitutes welding residual stress; Dissection and analysis finds that also there is incomplete penetration defect in the Hastelloy clad root of weld that lost efficacy, and the existence of breach can cause stress raisers; In electroplating process, the conductive rollers frictional drive, steel plate can produce additional tensile stress to the conductive rollers surface; The stack of welding residual stress, alternate load stress has constituted the required tension condition of stress corrosion cracking.
In the electrogalvanizing solution around the conductive rollers, mainly contain H
+, SO
4 2-, Cl
-, Zn
2+, and a spot of other metal ion.The Hastelloy conductive rollers is in H for a long time
+, SO
4 2-, Cl
-Corrosive medium in, stress corrosion cracking, the needed environmental medium condition of spot corrosion constitute to take place.
The Hastelloy weld metal of welding attitude is a heterogeneous structure, has the inhomogeneities of chemical composition.The microprobe analysis of Hastelloy TIG weld seam; Discovery exists the segregation of Mo at the crystal boundary place, and rich Mo separates out mutually and causes near the poor Mo crystal boundary precipitated phase; Poor Mo zone is as the anode of galvanic cell reaction; Generation for corrosion provides the possibility on the thermodynamics, has constituted the organization condition that causes corrosion cracking.
On the surface of stress corrosion cracking (SCC), found the etch pit that spot corrosion produces.Think: in the conductive rollers working environment, conductive rollers, steel band, when electroplate liquid contacts, constituted an inaccessible relatively zone.By chlorion Cl in occlusion areas and the electroplate liquid
-Existence and the spot corrosion on the conductive rollers that causes surface.Spot corrosion is as the formation of crack of stress corrosion cracking, and the induced stress corrosion cracking germinates.After the crack initiation, crack tip has aggravated stress to be concentrated, and makes that conductive rollers cylindrical shell crack tip receives bigger tensile stress in corrosive medium, impels stress corrosion cracking (SCC) vertically to expand along the expansion of thickness of slab depth direction with along weld seam.
Conductive rollers was used after a period of time, and the stress corrosion cracking (SCC) pit has influenced steel plate zinc coat surface quality, must carry out grinding to conductive rollers, removed the surface that crackle and pit are arranged.The continuous attenuate of the thickness of Hastelloy conductive rollers; Effectively loaded area also constantly reduces; The notch effect of the root of weld is more remarkable, and welding residual stress that weld seam bears and loading stress make a concerted effort to increase, and makes the speeding up of germinating of weld stress corrosion cracking and expansion.After grinding for several times; Conductive rollers Hastelloy clad is more and more thinner; Residual thickness thinnest part (incomplete root penetration bosom); Concentrate under the acting in conjunction at the stress in loading stress, welding residual stress and incomplete root penetration district,, then form penetrating crack when stress level has surpassed the tensile strength of material itself.Stress corrosion cracking (SCC) is further vertically expanded along thickness of slab depth direction and weld seam, then causes weld seam to ftracture on a large scale after reaching certain degree of depth and length, and conductive rollers is entirely ineffective.
Summary of the invention
The present invention is directed to the above-mentioned deficiency that prior art exists, propose a kind of method that improves Hastelloy conductive rollers weld seam decay resistance, can significantly improve conductive rollers weld seam decay resistance.Use the conductive rollers of the present invention's processing, on production line, use and do not find weld corrosion in 8 months,, cause corrosion to be rolled off the production line and reprocess only because of the mother metal surface damage.
The present invention realizes that through following technical scheme the present invention makes the Hastelloy anticorrosion layer cylindrical shell and the roller core of conductive rollers at first respectively, adopts hot cover process to assemble the raising of the decay resistance that is achieved then.
Described Hastelloy anticorrosion layer cylindrical shell adopts the laser penetration welding to make, and can obtain the weld seam of a kind of even, continuous zero defect, fine grain, low residual stress, high anti-stress-corrosion ability, thus the service life of improving conductive rollers.
Described Hastelloy anticorrosion layer cylindrical shell is made in the following manner and is obtained: at first according to length, diameter, corrosion resistant alloy layer thickness and the development size of Hastelloy roller, confirm thickness, length and the width of required Hastelloy sheet material; After adopting plasma arc or laser to carry out cutting stock, plane limit, round as a ball processing, the assembling of cylindrical shell longitudinal joint, tack welding then, be welded into cylindrical shell with variable element laser penetration soldering method again; Subsequently the Hastelloy cylindrical shell is carried out whole solution treatment and eliminates the welding point residual stress,, form the equiax crystal γ phase constitution similar, improve the structural homogenity of welding point with mother metal to eliminate the dendrite pattern of weld seam; According to the dimensional accuracy of roller core diameter, cylindrical shell is carried out circle fine finishining in accurate set round, the boring machine at last.
Described conductive rollers is made in the following manner and is obtained:
The first step, confirm the thickness and the dimensions of required Hastelloy sheet material, adopt the laser assembly solder method that the Hastelloy board material splice is become the required blank of cylindrical shell;
Described laser assembly solder method is meant: on the frock of flat board butt joint, adopt the laser penetration weldering two little board material splices of dimensions to be become the blank of required size; I type groove is adopted in the laser splicing; Adopt the butt joint side of digging limit or method for milling machining sheet; Adopting the piano type pressing plate to compress mode rigidly fixes to prevent welding deformation, present case laser power 11-13KW, speed of welding 1-1.2m/min welding point.
Second step, blank is cut, digs the limit and pillar buoy is processed in round as a ball processing successively, again assembling of pillar buoy longitudinal joint and tack welding are handled, with variable element laser penetration soldering method pillar buoy is welded and process cylindrical shell;
Described cutting, plane limit and round as a ball processing are meant: before cylindrical shell is round as a ball; Adopt the machine cut method of edge planer or milling machine that blank is machined to the dimensional accuracy that cylindrical shell launches; And the end face preprocessing of sheet material abutment joint become groove; Abutment joint after round as a ball just in time forms I type joint, and it is round as a ball to adopt three core rolls to carry out at last, the direction that adopts guiding device control sheet material to get into milling train in the round as a ball process; Be the perpendicularity and the depth of parallelism of control panel edge line and roll axis; Through digitial controller accurate control sheet material charging rate and nip pressure, use template constantly to detect the sheet material shape variation, control Hastelloy cylindrical shell forming process and forming accuracy in the operation of rolling.
Described tack welding is handled and is meant: the laser power of employing 6-8KW is carried out erection welding, solder joint length 5-6mm with the speed abutment joint of 1m/min on welding tooling.
Described variable element laser is worn soldering method thoroughly and is meant: present case variable element laser is worn weldering parameter area: laser power 11-13KW, speed of welding 1-1.2m/min thoroughly.
The 3rd step, cylindrical shell is carried out whole solution treatment to eliminate the dendrite pattern of weld seam, forms the equiax crystal γ phase constitution similar, improve the structural homogenity of welding point, elimination welding point residual stress, thereby the decay resistance of raising weld seam with mother metal.
Described solution treatment is meant: cylindrical shell is heated to 1100 ℃-1130 ℃ and be incubated 50min-80min in atmosphere furnace, chilling is handled then.
The 4th goes on foot, cylindrical shell is carried out justifying fine finishining in accurate set round, the boring machine, adopts hot cover process that Hastelloy cylindrical shell and roller core are assembled into conductive rollers again.
Technological merit of the present invention is:
1. the conventional conductive roller is employed in and coats one deck 10mmm corrosion resisting alloy on the roller core, adopts manual electric arc welding or TIG arc welding, necessary bevel; Adopt multi-pass welding; Add the filling metal, welding point metal and corrosion resisting alloy incomplete same (alienation), the corrosion resistance of reduction weld metal; And the corrosion resistant alloy cylindrical shell of conductive rollers of the present invention and roller core are made respectively, and the Hastelloy cylindrical shell uses the laser penetration welding, and square groove does not stay the gap, does not add filling metal, one side welding with back formation yet.
2. the manufacturing of conventional conductive roller is employed in and coats one deck 10mmm corrosion resisting alloy on the roller core, uses manual electric arc welding or TIG arc welding method, adopts multi-pass welding, and welding point and heat affected area are wide, and HAZ crystal grain is thick, and joint performance is worsened; And the corrosion resistant alloy cylindrical shell of conductive rollers of the present invention and roller core are made respectively, and the Hastelloy cylindrical shell adopts the laser penetration welding, and weld width only is the 1/4-1/5 of manual electric arc welding or TIG arc welding weld seam; And heat affected area width 0.4-0.5mm only.
3. the manufacturing of conventional conductive roller is employed in and coats one deck corrosion resisting alloy on the roller core, uses manual electric arc welding or TIG arc welding, and the back of weld moulding is irregular, and welding current is too small, causes the root incomplete fusion, causes stress to be concentrated; And welding current is excessive, then possibly cause clad and roller core welded together, and weld metal is diluted, and corrosion resistance descends; Even the formation martensitic structure, causing the root run cracking, corrosion resistance descends.And the corrosion resistant alloy cylindrical shell of conductive rollers of the present invention and roller core are made respectively, and the Hastelloy cylindrical shell adopts the laser penetration welding, one side welding with back formation, and the cylindrical shell postwelding is eliminated weld defect through the flaw detection of 100%X light.
4. the manufacturing of conventional conductive roller is employed in and coats one deck corrosion resisting alloy on the roller core, uses manual electric arc welding or TIG arc welding, because solution treatment is not done in the scantling restriction, weld metal keeps the column crystal pattern, and corrosion resistance is poor.And the corrosion resistant alloy cylindrical shell of conductive rollers of the present invention and roller core are made respectively; The Hastelloy cylindrical shell adopts the laser penetration welding, and the cylindrical shell postwelding adopts solution treatment, forms the equiaxed grain structure similar with mother metal; The electrode potential of weld seam is higher than mother metal, has improved the corrosion resistance property of weld seam.
5. the manufacturing of conventional conductive roller is employed in and coats one deck corrosion resisting alloy on the roller core; Adopt manual electric arc welding or TIG arc welding method; Welding point and heat affected area are wide, because the roller core rigidity is restrained, cause welding point to form very high tensile stress during the weld seam contraction distortion; The induced stress corrosion cracking.And the corrosion resistant alloy cylindrical shell of conductive rollers of the present invention and roller core are made respectively, and the Hastelloy cylindrical shell adopts the laser penetration welding, and the cylindrical shell postwelding adopts solution treatment, eliminates welding residual stress fully.
The specific embodiment
Elaborate in the face of embodiments of the invention down, present embodiment provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment being to implement under the prerequisite with technical scheme of the present invention.
Present embodiment may further comprise the steps:
The first step, confirm the thickness and the dimensions of required Hastelloy sheet material, if commercially available Hastelloy sheet material specification less than required size, can adopt the laser assembly solder method that the board material splice of commercially available small dimension is become the required blank of cylindrical shell; The control of weld seam segmentation parameter is identical with the second step Zhong Hashi alloy cylinder longitudinal seam variable element laser weld in laser assembly solder joint machining accuracy, the control of joint fit-up gap, the laser beam welding.Different is flat-plate laser splicing on the anchor clamps of butt plates welding, carrying out joint erection welding.I type groove is adopted in dull and stereotyped splicing, and the sheet edge processing flatness need satisfy following machining accuracy ± 0.1mm, and the anchor clamps horizontal thrust should make banjo fixing butt jointing closely contact, and the joint fit-up gap is smaller or equal to≤0.4mm, and the fluctuation in gap is less than 0.2mm on the seam total length; Joint assembling unfitness of butt joint≤0.2mm; Adopt bolt (or pneumatic) hold down gag (piano type press plate mechanism) during butt plates welding, abutment joint is fastened on the air cooling-copper lining reliably, change and welding deformation to prevent welding process center tap gap.
Second step, successively the cylindrical shell blank is cut, digs limit, bevel and round as a ball processing and process pillar buoy, then the longitudinal joint of pillar buoy is assembled and tack welding is handled, be welded into cylindrical shell with variable element laser penetration soldering method again.In order to obtain the weld seam of a kind of even, continuous zero defect, fine grain, low residual stress, the laser weld critical process has with the control parameter:
2.1) assembling of the joint of cylindrical shell longitudinal joint controls with the play movement.The laser beam spot diameter is 0.5mm only, and the variation in butt joint gap is very responsive.Hastelloy cylindrical shell longitudinal joint Laser Welding is carried out on one welding tooling anchor clamps; During welding; Cylindrical shell butt joint longitudinal joint is shelved on the air cooling copper lining; Z adopts bolt (or pneumatic) hold-down mechanism that welding point is rigidly fixed to (radially), to prevent the variation of cylindrical shell joint fit-up gap, seam skew, axial float and welding deformation.It is worthy of note before cylindrical shell is round as a ball, should the edge preprocessing of dull and stereotyped abutment joint be become groove, the abutment joint after round as a ball just in time forms I type groove.Horizontal thrust is difficult to apply during the assembling of cylindrical shell butt joint longitudinal joint, and round as a ball back adopts the bundle hoop that the cylindrical shell seam is fixed, and prevents that barrel distortion from causing the fit-up gap to change, and after adopting the solid welding bead fixed cylinder seam of laser spots, could remove the bundle hoop.Joint assembling control accuracy: maximum fit-up gap requires less than 0.4mm, and the gap inhomogeneities is less than 0.2mm and unfitness of butt joint≤0.2mm radially, and axial misalignment is no more than 2mm.
2.2) cleaning of welding point.The stomata sensitivity of Hastelloy laser weld is big, is easy to form hydrogen blistering.Before carrying out the cylindrical shell longitudinal seam welding, the workpiece (comprising frock, copper lining, piano type press plate mechanism) of strict cleaning seam interface and seam two sides is removed the surface of the work oxide; The grease, the organic matter that adopt alcohol or acetone surface of the work to stick; Clean the back and adopt use infrared light or air cooking welding point, remove moisture.It should be noted that cylindrical shell adopts the bundle hoop that the cylindrical shell longitudinal joint is fixed after round as a ball; The butt joint end face that be difficult in the butt joint gap this moment is cleared up; Must prick the fixing joint that carries out before of hoop in installation clears up; And preventing has dust, water and organic matter to get in the play movement in bundle hoop, tack welding, carrying, lifting, laser-weld seam centering process are installed, and avoids possible grease, sweat, impression of the hand secondary pollution.
2.3) laser-weld seam centering.Adopt before the laser weld infrared ray optical direction to introduce row weld seam centering, carry out centering at weld seam starting point, intermediate point, 3 at terminal point at least and regulate, make that the facula area of infrared beam on seam two sides equates on the whole longitudinal joint, guarantee laser beam and weld seam center.It is worthy of note; Laser weld not only need be carried out laser beam-weld seam left and right sides centering; Also quite responsive to laser torch to the variable in distance on the surface of workpiece; Laser torch is to the variation of the distance on the surface of workpiece, i.e. the change in location of focus on workpiece, thus cause weld penetration and shape variation.
2.4) the tack welding road.In the scope of on frock clamp, carry out the assembling of cylindrical shell longitudinal joint joint, make gaping of joints, the control of seam misalignment being set, carry out seam laser tack welding immediately.Size of the solder joint of tack welding (length 3-5mm) and solder joint distribution (spacing 350-450mm;); Answer the solid welding bead of guarantee point that enough bonding strengths are arranged, lost efficacy, or change owing to thermal deformation causes welding the place ahead groove gap and in laser penetration welding process subsequently, be unlikely to take place to ftracture; Should reduce tack weld simultaneously as far as possible the shaping of follow-up laser penetration weldering welding bead is brought harmful effect.Present case tack welding laser power 6-8KW, speed of welding 1m/min, Ar-He 20-30l/min, size 4-5mm.It is worthy of note that cylindrical shell longitudinal joint laser penetration welder skill and flat-plate laser splicing welder plant slightly different.Flat-plate laser when weldering splicing, carry out continuous laser immediately and penetrate welding carrying out the solid postwelding of abutment joint laser spots; And the laser penetration of cylindrical shell longitudinal joint is welded in the solid postwelding of completion cylindrical shell longitudinal joint laser spots, removes Fastening hoop earlier, carries out centering, the location of laser torch and seam more again, just can carry out continuous laser penetration welding.
2.5) variable element laser penetration welding.So-called variable element laser weld is meant when carrying out the welding of dull and stereotyped abutment joint or cylindrical shell longitudinal seam continuous laser, to sweating heat input carrying out segmentation control.The weld seam starting point, because the Hastelloy plate temperature is low, heat conduction is fast; Laser power outputs to the stable process that also needs, and the laser power that the weld seam The initial segment presets in the laser weld control program is omited height a bit than interlude seam laser power, perhaps makes the The initial segment speed of welding more lower slightly than the speed of welding of interlude; And raise in heat accumulation, the temperature of weld seam ending segment owing to material, in the laser weld control program that the laser power that presets is more lower slightly than the laser power of interlude, perhaps make the speed of welding of ending segment slightly higher than the speed of welding of interlude; To guarantee the appearance of weld uniformity.In carrying out the continuous laser welding process; Weld defect often appears in the The initial segment of weld seam and ending segment easily; For fear of in the weld seam of cylindrical shell, producing weld defect, be provided with lead-in plate and end tab at the starting point and the terminal point of abutment joint, lead-in plate and end tab adopt the equal thickness homogeneous material.Present case optimized parameters: beam spot diameter, 0.5mm, laser power 11-13KW, speed of welding 1-1.2m/min; Front surface A r-He gas shiled 20-30l/min; Focal position-1mm back of weld has the air cooling copper lining, back side argon shield, and flow-control is at 8-10L/min.
If after dull and stereotyped abutment joint or the cylindrical shell longitudinal seam laser penetration welding, when range estimation finds that the weld seam upper surface is recessed, can adopt LASER or fill silk TIG weldering carrying out finishing.If x-ray examination finds in the weld seam large-size pore to be arranged, even when defective such as discontinuous, lack of penetration occurring, reprocess the TIG that can take to fill silk weldering part, finds the defective of severe overweight should cut away weld seam, again finished edge, assembling welding.
The weld seam of described employing silk filling TIG weldering is meant the weld seam that adopts C-22 alloy welding wire TIG welding.The corrosion potential measurement shows: the corrosion potential of the TIG welding line that fills silk and mother metal are quite or a little less than the mother metal corrosion potential, and the corrosion potential of laser penetration welding line will be higher than mother metal.Both corrosion potentials are not both because Laser Welding is fast owing to cooling velocity, and its tissue is mainly the γ phase, has higher corrosion potential, and the TIG that fills silk is welded in and separates out more rich Mo phase-σ phase in the cooling procedure, and its corrosion potential is reduced.Welding point general corrosion evidence laser weld or be superior to base metals in ferric sulfate-sulfuric acid solution through the laser weld resistance to corrosion of solution treatment.
The 3rd step, cylindrical shell is carried out whole solution treatment to eliminate the dendrite pattern of weld seam, forms the equiax crystal γ phase constitution similar, the structural homogenity of raising welding point with mother metal; Eliminate the welding point residual stress, thereby improve the decay resistance of weld seam.
Described solution treatment specifically may further comprise the steps:
3.1) the solid solution treatment process parameter optimization.Several groups of samples to using laser penetration welding preparation adopt different technical parameters to carry out solution treatment, and through the weld seam Metallographic Analysis, electrode potential Measurement and analysis and the test of welding point corrosion resistance are relatively confirmed best laser welded seam solution treatment standard.The technological parameter of present case Zhong Hashi Alloy by Laser weld seam solution treatment is seen shown in the table 1.Cooling condition is atmospheric environment and nitrogen protection, and the type of cooling is air cooling and cools off with stove.
Table 1 Hastelloy solution treatment standard
| Specimen coding | Solid solution temperature | Temperature retention time | Protection/the type of cooling |
| 1 | 1000℃ | 60min | Atmospheric environment, air cooling |
| 2 | 1050℃ | 60min | Atmospheric environment, air cooling |
| 3 | 1100℃ | 60min | Atmospheric environment, air cooling |
| 4 | 1125℃ | 60min | Atmospheric environment, air cooling |
| 5 | 1125℃ | 70min | Nitrogen protection is cooled off with stove |
| 6 | 1125℃ | 70min | Atmospheric environment, air cooling |
To using the heat treated sample of different specification parameter, carried out metallographic observation, find after the solution treatment of 1000 ℃ of-1050 ℃ * 60min, weld metal still be columanar structure, can significantly observe the melt run of weld seam; Through 1100 ℃ * 60min solution treatment, the regional area column crystal in the weld seam has become equiax crystal, still can be observed the melt run of weld seam; And through after the 1125 ℃ * 60min solution treatment, weld structure is transformed into equiax crystal fully, and melt run disappears, but regional area also can be found the vestige of column crystal in the weld seam.Above-mentioned analysis shows that the solution treatment standard of 1125 ℃ * 60min just is in critical condition, the vestige of the residual column crystal of weld seam regional area.Determine the proper extension solution treatment time thus.After 1125 ℃ * 70min solution treatment, the weld seam column crystal disappears, and shape is organized the similar tiny equiax crystal that becomes with mother metal.The solution treatment standard parameter that present case is finally confirmed is: 1125 ℃ * 70min.
In air with nitrogen protection under the weld structure of when cooling solution treatment gained, basic identical, but have more black precipitated phase to separate out at intergranular with the sample of stove cooling.Its reason is because slower with the stove cooling velocity, and sample is in the sample that time of the temperature range that the black precipitated phase forms will cool off in the air.
3.2) specification of heat treatment control.The key of solution treatment is a Control for Kiln Temperature, and programming rate is suitable slow, and cylindrical shell is evenly heated; Furnace temperature rises to 1125 ℃, and stays for some time in this temperature, so that cylindrical shell weld seam austenitizing; Temperature retention time is relevant with thickness of slab, size, the barrel support shelf structure factor of cylindrical shell, and temperature retention time is not enough, and the weld seam precipitated phase can not dissolve fully, and austenitizing is not thorough; Temperature retention time is long, and austenite crystal is too grown up, and then causes performance to descend.
3.3) cooling fast.The Hastelloy cylindrical shell is heated to austenitizing temperature (1125 ℃) insulation a period of time (70min) afterwards in stove, cylindrical shell is hung out cooling rapidly in the external air of stove, perhaps is placed on inflation cooling or water spray cooling in the container.Barrel temperature is cooled to below 250 ℃ cooling velocity control 2-3min from 1125 ℃.Cool off purpose fast: obtain supersaturated austenite solid solution stabilizing tissue, prevent phase transformation and grain growth, improve the weld seam corrosion resistance.Cooling velocity is slow during solution treatment, and alloy is at the interval overstand of sensitizing temperature, and welded seam area is separated out more rich Mo/Cr phase, causes the resistance to corrosion of weld seam to descend.
3.4) Deformation control.Pass in and out burner hearth and prevent that cylindrical shell is out of shape in heating process for the ease of the lifting cylindrical shell, the Hastelloy cylindrical shell is placed on the Support bracket, lifts in the well formula atmosphere furnace then and vertical the placement.
The 4th goes on foot, the Hastelloy cylindrical shell is carried out justifying fine finishining in accurate set round, the boring machine, adopts hot cover process that Hastelloy cylindrical shell and roller core are assembled into conductive rollers again.
Described hot cover process is meant after the solution treatment of Hastelloy cylindrical shell; With three core rolls cylindrical shell is rectified the garden, boring machine carries out fine finishining to endoporus, the internal diameter of cylindrical shell less than roller core overall diameter condition under; Through being heated to a certain temperature, cylindrical shell integral body makes its expansion; Under this temperature, assemble with roller core, cooling is shunk with rear cylinder body, closely wraps up in abdomen on roller core.Accurately the later residual stress size of control Hastelloy cylindrical shell cooling also is one of critical process factor of application cylinder body stress corrosion rate.Cylinder internal diameter and the difference (ΔΦ) of roller core diameter of method through finite element numerical simulation in the present case before to hot jacket carried out accurate Calculation.The technological specification of Hastelloy cylindrical shell hot jacket: 300 ℃ * 2hr of heating-up temperature insulation, in stove, carry out vertical hot jacket, cylindrical shell cooling back residual stress 0.5 σ
0.2
Claims (7)
1. method that improves Hastelloy conductive rollers weld seam decay resistance; It is characterized in that; Make the Hastelloy anticorrosion layer cylindrical shell and the roller core of conductive rollers at first respectively, adopt hot cover process to assemble then, wherein: Hastelloy anticorrosion layer cylindrical shell adopts the laser penetration welding to make; Described Hastelloy anticorrosion layer cylindrical shell is made in the following manner and is obtained: thickness, length and the width of at first confirming required Hastelloy sheet material; After adopting plasma arc or laser to carry out cutting stock, plane limit, round as a ball processing, the assembling of cylindrical shell longitudinal joint, tack welding then, be welded into cylindrical shell with variable element laser penetration soldering method again; Subsequently the Hastelloy cylindrical shell is carried out whole solution treatment and eliminates the welding point residual stress, at last cylindrical shell is carried out circle fine finishining in accurate set round, the boring machine.
2. the method for raising Hastelloy conductive rollers weld seam decay resistance according to claim 1 is characterized in that described conductive rollers is made in the following manner and obtained:
The first step, confirm the thickness and the dimensions of required Hastelloy sheet material, adopt the laser assembly solder method that the Hastelloy board material splice is become the required blank of cylindrical shell;
Second step, blank is cut, digs the limit and pillar buoy is processed in round as a ball processing successively, again assembling of pillar buoy longitudinal joint and tack welding are handled, with variable element laser penetration soldering method pillar buoy is welded and process cylindrical shell;
The 3rd step, cylindrical shell is carried out whole solution treatment to eliminate the dendrite pattern of weld seam, forms the equiax crystal γ phase constitution similar, improve the structural homogenity of welding point, elimination welding point residual stress, thereby the decay resistance of raising weld seam with mother metal;
The 4th goes on foot, cylindrical shell is carried out justifying fine finishining in accurate set round, the boring machine, adopts hot cover process that Hastelloy cylindrical shell and roller core are assembled into conductive rollers again.
3. the method for raising Hastelloy conductive rollers weld seam decay resistance according to claim 2; It is characterized in that; Described laser assembly solder method is meant: on the frock of flat board butt joint, adopt the laser penetration weldering two little board material splices of dimensions to be become the blank of required size; I type groove is adopted in the laser splicing, adopts the butt joint side of digging limit or method for milling machining sheet, adopts the piano type pressing plate to compress mode then welding point is rigidly fixed to prevent welding deformation; The power of said laser is 11-13KW, speed of welding 1-1.2m/min.
4. the method for raising Hastelloy conductive rollers weld seam decay resistance according to claim 2; It is characterized in that the cutting described in second step, plane limit and round as a ball processing are meant: before cylindrical shell is round as a ball, adopt the machine cut method of edge planer or milling machine that blank is machined to the dimensional accuracy that cylindrical shell launches; And the end face preprocessing of sheet material abutment joint become groove; Abutment joint after round as a ball just in time forms I type joint, and it is round as a ball to adopt three core rolls to carry out at last, the direction that adopts guiding device control sheet material to get into milling train in the round as a ball process; Be the perpendicularity and the depth of parallelism of control panel edge line and roll axis; Through digitial controller accurate control sheet material charging rate and nip pressure, use template constantly to detect the sheet material shape variation, control Hastelloy cylindrical shell forming process and forming accuracy in the operation of rolling.
5. the method for raising Hastelloy conductive rollers weld seam decay resistance according to claim 2; It is characterized in that; Tack welding described in second step is handled and is meant: the laser power of employing 6-8KW is carried out erection welding, solder joint length 5-6mm with the speed abutment joint of 1m/min on welding tooling.
6. the method for raising Hastelloy conductive rollers weld seam decay resistance according to claim 2 is characterized in that, the variable element laser penetration soldering method described in second step is meant: laser power 11-13KW, speed of welding 1-1.2m/min.
7. the method for raising Hastelloy conductive rollers weld seam decay resistance according to claim 2; It is characterized in that; Solution treatment described in the 3rd step is meant: cylindrical shell is heated to 1100 ℃-1130 ℃ and be incubated 50min-80min in atmosphere furnace, chilling is handled then.
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| CN103406666B (en) * | 2013-06-16 | 2016-01-13 | 北京工业大学 | The IC10 alloy in laser controlling dendritic growth direction connects and restorative procedure |
| JP7213070B2 (en) * | 2018-11-19 | 2023-01-26 | 昭和電工株式会社 | Cooling system |
| CN110484709B (en) * | 2019-08-06 | 2021-02-05 | 中国船舶重工集团公司第七二五研究所 | Method for eliminating welding stress of sealing cylinder in nuclear reactor |
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| CN1116247A (en) * | 1995-05-09 | 1996-02-07 | 宝山钢铁(集团)公司 | Stainless corrosion-resistant conductive rolle rsleeve and making method thereof |
| CN1540039A (en) * | 2003-11-03 | 2004-10-27 | 上海东新冶金技术工程有限公司 | Nickel base alloy composite conductor roll and manufacturing method |
| CN101457378A (en) * | 2007-12-11 | 2009-06-17 | 沈阳大陆激光技术有限公司 | Laser forming electro-galvanizing wire conducting roller and manufacturing method thereof |
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| US3860099A (en) * | 1973-05-18 | 1975-01-14 | Bethlehem Steel Corp | Composite contactor roll for electroplating |
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