CN104046919A - Long-life steam turbine blade and production process thereof - Google Patents
Long-life steam turbine blade and production process thereof Download PDFInfo
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Abstract
The invention discloses a long-life steam turbine blade. The long-life steam turbine blade consists of the following chemical components in percentage by weight: 0.29-0.31% of C, 0.16-0.19% of Si, 0.75-0.77% of Mn, 0.73-0.85% of Ni, 9.5-10.1% of Cr, 0.55-0.64% of Mo, 0.15-0.17% of Sn, 0.11-0.15% of V, 0.82-0.84% of Sr, 0.15-0.17% of Nb, 0.02%-0.03% of Cu, 0.13%-0.15% of T, 0.06-0.08% of B, not greater than 0.01% of Ca, not greater than 0.03% of S, not greater than 0.03% of P, 0.16%-0.18% of rear-earth metal, and the balance of Fe. The production process disclosed by the invention is carried out by hot-forging, annealing, blade mechanical machining, distressing thermal treatment, tempering thermal treatment, cooling, surface-enhanced thermal treatment, physical and chemical inspecting, ultrasonic-wave flaw detecting, and cleaning-packaging. The production process disclosed by the invention can greatly improve impact toughness of the blade, can improve water erosion resistance and corrosion resistance of the blade, and can prolong the service life of the blade.
Description
Technical field
The present invention relates to a kind of turbine blade and production technique thereof, specifically turbine blade of a kind of high life and production technique thereof.
Background technology
Steam turbine is the energy transformation of steam to be become to the rotary power machinery of mechanical work, claims again steam turbine.Main primover as generating use, also can directly drive various pumps, blower fan, compressor and propeller for vessels etc., can also utilize the steam discharge of steam turbine or intermediate extraction to meet production and heat supply needs in life.Steam turbine is mainly used in the fields such as power industry, shipping industry, cement, chemical industry, oil, metallurgy, heavy-duty machinery.
Steam turbine is a kind of revolving hydrodynamic force machinery, and it directly plays a part to change the heat energy of steam or combustion gas into mechanical energy, and blade is steam turbine " heart ", is part very main in steam turbine.Blade is generally all in high temperature, under the medium of high pressure and corrosion, works, and rotor blade also rotates with very high speed.In large-size steam turbine, the linear velocity of blade tip has surpassed 600m/s, so blade also will bear very large centrifugal stress.Be specially: (i) blade is in steam turbine, the kinetic energy of steam flow to be converted to the vitals of useful work, and its Working environment is extremely severe, and the working conditions of each grade blade is all not identical.Initial what rotor blade is also bearing the effect of maximum static stress, dynamic stress and repeated stress except working in hyperthermia and superheating steam simultaneously, high temperature oxidation and corrosion, abrasion and high temperature creep generally occurs and destroy.Along with the expansion working of superheated vapour, vapor temperature reduces gradually, although last a few grade blade working temperature lower (60 ℃-110 ℃), blade bears washing away of the water droplet that is mingled with in steam, causes water erosion.In addition, in operational process, be deposited on solubility salt crust (as sodium salt) on blade and absorb steam because the moisture content formation corrodibility electrolytic solution that temperature reduction condenses overlays on blade surface, cause galvanic corrosion meanwhile, because last stage blade size is larger, in high speed rotating, (about 3000r/min) produces very large centrifugal force, and blade is also subject to the effect of the unsettled periodic disturbance power of steam to produce vibration in addition.Last stage blade, at centrifugal force, under the complex stress condition that blade vibration and water wash away, adds to work in to have under corrosive environment, often produces stress corrosion, corrosion fatigue, and fatigue waits destruction.The blade of considered repealed is usually the compound result of above-mentioned multiple failure mode.(ii) the working temperature of each grade blade is not identical.And be operated in the severe environment such as high temperature, high pressure, high rotating speed or wet-steam region, standing the acting in conjunction of centrifugal force, steam power, steam exciting force, corrosion and vibration and the erosion of wet-steam region high velocity water droplets.(iii) according to the working conditions of blade, can be divided into two kinds of movable vane and stator blades.The residing working conditions of turbine blade, particularly rotor blade is extremely severe.The working temperature that is mainly manifested in each grade blade is not identical.The residing temperature of first step blade is the highest, and close to inlet steam temperature, due to steam step-by-step work done, temperature reduces step by step subsequently, until last stage blade will drop to below 100 ℃.Blade is to work in moving water vapor medium in addition, and wherein majority is in superheated vapour, to work and last stage blade is to work in moist steam, in superheated vapour, containing aerobic, can cause high temperature oxidation and corrosion, and the fatigue strength of blade is reduced.At the wet-steam region solubility salt crust absorption globule, become electrolytic solution and cause galvanic corrosion, the dissociating water molecule of wet-steam region, because subcooled condensation becomes water droplet, impacts movable vane steam admission side convex surface and causes water erosion in addition.In steam turbine working process, rotor blade is also bearing maximum static stress, dynamic stress and repeated stress.While being mainly manifested in rotor, act on the caused tensile stress of centrifugal force on blade, the effect of steam flow produces stress in bending and torsion and blade and is subject to the effect of exciting force to produce the repeated stress of forced vibration, the Working environment that all these are severe, all will impel blade failure fracture, after indivedual leaf destructions, its fragment can break the blade of adjacent or next stage, makes rotor overbalance and cannot work.
Blade not only quantity is many, and complex-shaped, and processing request is strict.The labor content of blade is very large, accounts for 1/4th to 1/3rd of steam turbine, the total amount of finish of internal combustion turbine.The processing quality of blade directly has influence on operational efficiency and the reliable rows of unit, and the processing mode of the quality of blade and life-span and blade has close relationship.So the processing mode of blade has a great impact the work quality of steam turbine and production economy.Along with scientific and technical development, the processing means of blade is also with rapid changepl. never-ending changes and improvements, and advanced processing technology extensively adopts.Meet the application that the use properties demand improving constantly only relies on new blade material and be still difficult to meet, just can reach blade tool high-level efficiency, high precision and the requirement of high life in the middle of various heat treatment technicss must being applied to the manufacture of turbine blade.
Summary of the invention
Technical problem to be solved by this invention is: a kind of high life turbine blade and production technique thereof are provided, by the change to the adjustment of turbine vane feed composition and smelting technology, improve water erosion resistent ability and the corrosion resistance of turbine vane raw material, thereby improve the work-ing life of blade.
The technical scheme that the present invention solves above technical problem is:
A high life turbine blade, the mass percent of its chemical composition is: C:0.29-0.31%, Si:0.16-0.19%, Mn:0.75-0.77%, Ni:0.73-0.85%, Cr:9.5-10.1%, Mo:0.55-0.64%, Sn:0.15-0.17%, V:0.11-0.15%, Sr:0.82-0.84%, Nb:0.15-0.17%, Cu:0.02-0.03%, Ti:0.13-0.15%, B:0.06-0.08%, Ca≤0.01%, S≤0.03%, P≤0.03%, rare earth metal: 0.16-0.18%, surplus is Fe.
The production technique of above-mentioned high life turbine blade, following operation is carried out: forge hot → annealing → blade mechanism processing → destressing thermal treatment → modified thermal treatment → cooling → surface strengthening thermal treatment → physical and chemical inspection → UT (Ultrasonic Testing) → clean packing;
Described annealing operation: after forge hot, at 790-795 ℃ of insulation 8-10 minute, then stove is incubated 8-9 minute after being chilled to 260-263 ℃, is finally cooled to room temperature;
Described destressing heat treatment step: adopt zone heating, first paragraph Heating temperature is 590-600 ℃, to the rear insulation of temperature 40-45min, second segment Heating temperature is 550-560 ℃, after temperature, is incubated 12-16min, then air cooling is to room temperature;
Described modified heat treatment step: adopt double tempering, tempering temperature is greater than tempering temperature for the second time for the first time; Tempering for the first time: adopt zone heating, first paragraph Heating temperature is 860-864 ℃, to the rear insulation of temperature 5-8min, second segment Heating temperature is 780-785 ℃, after temperature, is incubated 10-13min, then air cooling carries out normalizing for the second time to room temperature; Tempering for the second time: adopt zone heating, first paragraph Heating temperature is 755-758 ℃ of heating, to the rear insulation of temperature 12-14min, second segment Heating temperature is 590-600 ℃ of heating, after temperature, is incubated 5-8min;
Described refrigerating work procedure: adopt water-cooled with the rate of cooling of 7-9 ℃/s by blade water-cooled to 480-485 ℃ adopt again water-cooled with the rate of cooling of 1-3 ℃/s by blade water-cooled to room temperature;
Described surface strengthening heat treatment step: thermal treatment temp 950-955 ℃, to insulation 4-6 minute after temperature, then adopt water-cooled with the rate of cooling of 1-3 ℃/s by blade water-cooled to room temperature.
The technical scheme that the present invention further limits is:
Aforesaid high life turbine blade, the chemical composition mass percent of described rare earth metal is: cerium: 6-10%, praseodymium: 7-9%, neodymium: 10-12%, promethium: 10-11%, gadolinium: 6-8%, lutetium: 5-7%, dysprosium: 4-8%, terbium: 13-15%, surplus is lanthanum.
Aforesaid high life turbine blade, the mass percent of its chemical composition is: C:0.29%, Si:0.16%, Mn:0.75%, Ni:0.73%, Cr:9.5%, Mo:0.55%, V:0.11%, Sr:0.82%, Nb:0.17%, Sn:0.15%, Cu:0.02%, Ti:0.13%, B:0.06%, Ca:0.01%, S:0.03%, P:0.01%, rare earth metal: 0.16%, surplus is Fe;
The chemical composition mass percent of described rare earth metal is: cerium: 6%, and praseodymium: 7%, neodymium: 10%, promethium: 10%, gadolinium: 6%, lutetium: 5%, dysprosium: 4%, terbium: 13%, surplus is lanthanum.
Aforesaid high life turbine blade, the mass percent of its chemical composition is: C:0.29%, Si:0.18%, Mn:0.76%, Ni:0.75%, Cr:9.6%, Mo:0.58%, Sn:0.16%, V:0.12%, Sr:0.83%, Nb:0.15%, Cu:0.02%, Ti:0.15%, B:0.07%, Ca:0.008%, S:0.02%, P:0.02%, rare earth metal: 0.17%, surplus is Fe;
The chemical composition mass percent of described rare earth metal is: cerium: 8%, and praseodymium: 8%, neodymium: 11%, promethium: 10%, gadolinium: 7%, lutetium: 6%, dysprosium: 6%, terbium: 14%, surplus is lanthanum.
Aforesaid high life turbine blade, the mass percent of its chemical composition is: C:0.31%, Si:0.19%, Mn:0.77%, Ni:0.85%, Cr:10.1%, Mo:0.64%, Sn:0.17%, V:0.15%, Sr:0.84%, Nb:0.16%, Cu:0.06%, Ti:0.14%, B:0.08%, Ca:0.008%, S:0.01%, P:0.03%, rare earth metal: 0.18, surplus is Fe;
The chemical composition mass percent of described rare earth metal is: cerium: 10%, and praseodymium: 9%, neodymium: 12%, promethium: 11%, gadolinium: 8%, lutetium: 7%, dysprosium: 8%, terbium: 15%, surplus is lanthanum.
The production technique of aforesaid high life turbine blade, wherein:
Described annealing operation: after forge hot, 790 ℃ of insulations 10 minutes, then stove was incubated 8 minutes after being chilled to 260 ℃, is finally cooled to room temperature;
Described destressing heat treatment step: adopt zone heating, first paragraph Heating temperature is 592 ℃, to the rear insulation of temperature 42 minutes, second segment Heating temperature was 555 ℃, after temperature, was incubated 15 minutes, then air cooling is to room temperature;
Described modified heat treatment step: adopt double tempering, tempering temperature is greater than tempering temperature for the second time for the first time; Tempering for the first time: adopt zone heating, first paragraph Heating temperature is 860 ℃, to the rear insulation of temperature 7 minutes, second segment Heating temperature was 785 ℃, after temperature, was incubated 11 minutes, then air cooling carries out normalizing for the second time to room temperature; Tempering for the second time: adopt zone heating, first paragraph Heating temperature is 755 ℃ of heating, to the rear insulation of temperature 12 minutes, second segment Heating temperature was 600 ℃ of heating, after temperature, was incubated 5 minutes;
Described refrigerating work procedure: adopt water-cooled with the rate of cooling of 7 ℃/s by blade water-cooled to 480 ℃, then adopt water-cooled with the rate of cooling of 1 ℃/s by blade water-cooled to room temperature;
Described surface strengthening heat treatment step: 950 ℃ of thermal treatment temps, to insulation after temperature 4 minutes, then adopt water-cooled with the rate of cooling of 1 ℃/s by blade water-cooled to room temperature.
The production technique of aforesaid high life turbine blade, wherein: described annealing operation: after forge hot, 791 ℃ of insulations 10 minutes, then stove was incubated 9 minutes after being chilled to 263 ℃, is finally cooled to room temperature;
Described destressing heat treatment step: adopt zone heating, first paragraph Heating temperature is 600 ℃, to the rear insulation of temperature 45min, second segment Heating temperature is 560 ℃, after temperature, is incubated 16min, then air cooling is to room temperature;
Described modified heat treatment step: adopt double tempering, tempering temperature is greater than tempering temperature for the second time for the first time; Tempering for the first time: adopt zone heating, first paragraph Heating temperature is 864 ℃, to the rear insulation of temperature 8min, second segment Heating temperature is 785 ℃, after temperature, is incubated 13min, then air cooling carries out normalizing for the second time to room temperature; Tempering for the second time: adopt zone heating, first paragraph Heating temperature is 758 ℃ of heating, to the rear insulation of temperature 14min, second segment Heating temperature is 600 ℃ of heating, after temperature, is incubated 8min;
Described refrigerating work procedure: adopt water-cooled with the rate of cooling of 9 ℃/s by blade water-cooled to 480 ℃, then adopt water-cooled with the rate of cooling of 3 ℃/s by blade water-cooled to room temperature;
Described surface strengthening heat treatment step: 955 ℃ of thermal treatment temps, to insulation after temperature 6 minutes, then adopt water-cooled with the rate of cooling of 3 ℃/s by blade water-cooled to room temperature.
The production technique of aforesaid high life turbine blade, wherein: described annealing operation: after forge hot, 793 ℃ of insulations 9 minutes, then stove was incubated 7 minutes after being chilled to 262 ℃, is finally cooled to room temperature;
Described destressing heat treatment step: adopt zone heating, first paragraph Heating temperature is 595 ℃, to the rear insulation of temperature 42min, second segment Heating temperature is 558 ℃, after temperature, is incubated 14min, then air cooling is to room temperature;
Described modified heat treatment step: adopt double tempering, tempering temperature is greater than tempering temperature for the second time for the first time; Tempering for the first time: adopt zone heating, first paragraph Heating temperature is 862 ℃, to the rear insulation of temperature 7min, second segment Heating temperature is 783 ℃, after temperature, is incubated 11min, then air cooling carries out normalizing for the second time to room temperature; Tempering for the second time: adopt zone heating, first paragraph Heating temperature is 757 ℃ of heating, to the rear insulation of temperature 13min, second segment Heating temperature is 595 ℃ of heating, after temperature, is incubated 7min;
Described refrigerating work procedure: adopt water-cooled with the rate of cooling of 8 ℃/s by blade water-cooled to 482 ℃, then adopt water-cooled with the rate of cooling of 2 ℃/s by blade water-cooled to room temperature;
Described surface strengthening heat treatment step: 952 ℃ of thermal treatment temps, to insulation after temperature 5 minutes, then adopt water-cooled with the rate of cooling of 2 ℃/s by blade water-cooled to room temperature.
In above operation: forging, blade mechanism processing, physical and chemical inspection, UT (Ultrasonic Testing) and clean packing are all used existing conventional process.
Advantage of the present invention is:
Content due to Cr in composition of the present invention is higher, and chromium element can cause the macrosegregation of carbon and alloying element, and blade there will be eutectic carbides, thereby reduces the impact toughness of blade; The present invention, by adding rare earth metal, can effectively weaken the segregation phenomenon of blade, can increase substantially the impact toughness of blade.
The present invention is by cooling after twice insulation, and it is more even that equal turbidity changes the Qiu Guang body tissue forming, and avoids forming incomplete same tissue, can prevent the early stage brittle cracking of blade, played beyond thought technique effect.
Blade of the present invention is due to the effect of alloying element (such as chromium element), the macrosegregation of carbon and alloying element, and blade there will be eutectic carbides, thereby reduces the impact toughness of blade; The present invention is by adding rare earth metal, and by double tempering (tempering for the first time and for the second time tempering) and temperature control, thereby the segregation phenomenon of blade is obviously weakened, can increase substantially the impact toughness of blade.
Blade of the present invention is due in mechanical processing process, due to cutter extruding, the impacts such as heat in metal cutting, make its interior tissue that inhomogeneous volume change occur, produce internal stress, the existence of internal stress, make interior tissue in a kind of utmost point unsure state, there is the tendency that strongly returns to unstress state, in the process constantly discharging in internal stress, the shape of turbine blade changes, original working accuracy is lost gradually, when quench treatment subsequently, can there is larger distortion or quenching crack in the turbine blade that internal stress after mechanical workout is not discharged completely, the present invention carries out stress relief annealing processing after mechanical processing process, thereby the internal stress of mechanical workout rear blade is discharged completely, avoids the modified thermal treatment of postorder high temperature to produce distortion or crackle.
Because blade working district is wet-steam region, and contain a large amount of water droplets, erosion blade under very high rim velocity and centrifugal force, makes vane tip leading edge produce spot corrosion and lost efficacy, and the height of blade water erosion resistent ability directly has influence on working efficiency and the safe operation of steam turbine; The present invention coordinates refrigerating work procedure by modified heat treatment step, can make blade surface produce 2-6mmHou tempered martensite, its water erosion resistent ability effectively improving; In addition, tempering temperature is less than temperature poor that tempering temperature for the first time can reduce surface and heart portion for the second time, makes vane thickness direction fine microstructures even; After normalizing, tempering further reduces the poor of surface and the temperature of heart portion, thereby makes surperficially to reach unanimity to heart portion performance; Cooling after tempering, the method of being combined with air cooling by water-cooled, first with speed of cooling water-cooled faster, then carry out air cooling, finally pass through again slower cooling by water to room temperature, not only can improve the water erosion resistent ability of blade, and can make to organize more uniform and stable, seldom there is pore and trachoma, guaranteed the corrosion resistance of blade, played beyond thought technique effect.
The present invention can crystal grain thinning by surface strengthening thermal treatment, improve the toughness of blade simultaneously, can alleviate or eliminate the defects such as banded structure, improve blade integral impact property, and the speed by speed of cooling is controlled, and make leaf tissue more uniform and stable, seldom there is pore and trachoma, and obtain good comprehensive mechanical property and corrosion resistance.
The salient features of turbine blade of the present invention is as shown in the table:
Table 1:
Embodiment
embodiment 1
The present embodiment provides a kind of high life turbine blade, and the mass percent of its chemical composition is: C:0.29%, Si:0.16%, Mn:0.75%, Ni:0.73%, Cr:9.5%, Mo:0.55%, V:0.11%, Sr:0.82%, Nb:0.17%, Sn:0.15%, Cu:0.02%, Ti:0.13%, B:0.06%, Ca:0.01%, S:0.03%, P:0.01%, rare earth metal: 0.16%, surplus is Fe; The chemical composition mass percent of described rare earth metal is: cerium: 6%, and praseodymium: 7%, neodymium: 10%, promethium: 10%, gadolinium: 6%, lutetium: 5%, dysprosium: 4%, terbium: 13%, surplus is lanthanum.
The production technique of the high life turbine blade of the present embodiment, is undertaken by following operation: forge hot → annealing → blade mechanism processing → destressing thermal treatment → modified thermal treatment → cooling → surface strengthening thermal treatment → physical and chemical inspection → UT (Ultrasonic Testing) → clean packing; Wherein:
Described annealing operation: after forge hot, 790 ℃ of insulations 10 minutes, then stove was incubated 8 minutes after being chilled to 260 ℃, is finally cooled to room temperature;
Described destressing heat treatment step: adopt zone heating, first paragraph Heating temperature is 592 ℃, to the rear insulation of temperature 42 minutes, second segment Heating temperature was 555 ℃, after temperature, was incubated 15 minutes, then air cooling is to room temperature;
Described modified heat treatment step: adopt double tempering, tempering temperature is greater than tempering temperature for the second time for the first time; Tempering for the first time: adopt zone heating, first paragraph Heating temperature is 860 ℃, to the rear insulation of temperature 7 minutes, second segment Heating temperature was 785 ℃, after temperature, was incubated 11 minutes, then air cooling carries out normalizing for the second time to room temperature; Tempering for the second time: adopt zone heating, first paragraph Heating temperature is 755 ℃ of heating, to the rear insulation of temperature 12 minutes, second segment Heating temperature was 600 ℃ of heating, after temperature, was incubated 5 minutes;
Described refrigerating work procedure: adopt water-cooled with the rate of cooling of 7 ℃/s by blade water-cooled to 480 ℃, then adopt water-cooled with the rate of cooling of 1 ℃/s by blade water-cooled to room temperature;
Described surface strengthening heat treatment step: 950 ℃ of thermal treatment temps, to insulation after temperature 4 minutes, then adopt water-cooled with the rate of cooling of 1 ℃/s by blade water-cooled to room temperature.
The salient features of turbine blade of the present invention is as shown in the table:
Table 2:
In above operation: forging, blade mechanism processing, physical and chemical inspection, UT (Ultrasonic Testing) and clean packing are all used existing conventional process.
embodiment 2
The present embodiment provides a kind of high life turbine blade, and the mass percent of its chemical composition is C:0.31%, Si:0.19%, Mn:0.77%, Ni:0.85%, Cr:10.1%, Mo:0.64%, Sn:0.17%, V:0.15%, Sr:0.84%, Nb:0.16%, Cu:0.06%, Ti:0.14%, B:0.08%, Ca:0.008%, S:0.01%, P:0.03%, rare earth metal: 0.18, surplus is Fe; The chemical composition mass percent of described rare earth metal is: cerium: 8%, and praseodymium: 8%, neodymium: 11%, promethium: 10%, gadolinium: 7%, lutetium: 6%, dysprosium: 6%, terbium: 14%, surplus is lanthanum.
The production technique of the high life turbine blade of the present embodiment, is undertaken by following operation: forge hot → annealing → blade mechanism processing → destressing thermal treatment → modified thermal treatment → cooling → surface strengthening thermal treatment → physical and chemical inspection → UT (Ultrasonic Testing) → clean packing; Wherein:
Described annealing operation: after forge hot, 791 ℃ of insulations 10 minutes, then stove was incubated 9 minutes after being chilled to 263 ℃, is finally cooled to room temperature;
Described destressing heat treatment step: adopt zone heating, first paragraph Heating temperature is 600 ℃, to the rear insulation of temperature 45min, second segment Heating temperature is 560 ℃, after temperature, is incubated 16min, then air cooling is to room temperature;
Described modified heat treatment step: adopt double tempering, tempering temperature is greater than tempering temperature for the second time for the first time, tempering for the first time: adopt zone heating, first paragraph Heating temperature is 864 ℃, after temperature, be incubated 8min, second segment Heating temperature is 785 ℃, after temperature, is incubated 13min, and then air cooling carries out normalizing for the second time to room temperature; Tempering for the second time: adopt zone heating, first paragraph Heating temperature is 758 ℃ of heating, to the rear insulation of temperature 14min, second segment Heating temperature is 600 ℃ of heating, after temperature, is incubated 8min;
Described refrigerating work procedure: adopt water-cooled with the rate of cooling of 9 ℃/s by blade water-cooled to 480 ℃, then adopt water-cooled with the rate of cooling of 3 ℃/s by blade water-cooled to room temperature;
Described surface strengthening heat treatment step: 955 ℃ of thermal treatment temps, to insulation after temperature 6 minutes, then adopt water-cooled with the rate of cooling of 3 ℃/s by blade water-cooled to room temperature.
The salient features of turbine blade of the present invention is as shown in the table:
Table 3:
In above operation: forging, blade mechanism processing, physical and chemical inspection, UT (Ultrasonic Testing) and clean packing are all used existing conventional process.
embodiment 3
The present embodiment provides a kind of high life turbine blade, and the mass percent of its chemical composition is: C:0.31%, Si:0.19%, Mn:0.77%, Ni:0.85%, Cr:10.1%, Mo:0.64%, Sn:0.17%, V:0.15%, Sr:0.84%, Nb:0.16%, Cu:0.06%, Ti:0.14%, B:0.08%, Ca:0.008%, S:0.01%, P:0.03%, rare earth metal: 0.18, surplus is Fe; The chemical composition mass percent of described rare earth metal is: cerium: 10%, and praseodymium: 9%, neodymium: 12%, promethium: 11%, gadolinium: 8%, lutetium: 7%, dysprosium: 8%, terbium: 15%, surplus is lanthanum.
The production technique of the high life turbine blade of the present embodiment, is undertaken by following operation: forge hot → annealing → blade mechanism processing → destressing thermal treatment → modified thermal treatment → cooling → surface strengthening thermal treatment → physical and chemical inspection → UT (Ultrasonic Testing) → clean packing; Wherein:
Described annealing operation: after forge hot, 793 ℃ of insulations 9 minutes, then stove was incubated 7 minutes after being chilled to 262 ℃, is finally cooled to room temperature;
Described destressing heat treatment step: adopt zone heating, first paragraph Heating temperature is 595 ℃, to the rear insulation of temperature 42min, second segment Heating temperature is 558 ℃, after temperature, is incubated 14min, then air cooling is to room temperature;
Described modified heat treatment step: adopt double tempering, tempering temperature is greater than tempering temperature for the second time for the first time; Tempering for the first time: adopt zone heating, first paragraph Heating temperature is 862 ℃, to the rear insulation of temperature 7min, second segment Heating temperature is 783 ℃, after temperature, is incubated 11min, then air cooling carries out normalizing for the second time to room temperature; Tempering for the second time: adopt zone heating, first paragraph Heating temperature is 757 ℃ of heating, to the rear insulation of temperature 13min, second segment Heating temperature is 595 ℃ of heating, after temperature, is incubated 7min;
Described refrigerating work procedure: adopt water-cooled with the rate of cooling of 8 ℃/s by blade water-cooled to 482 ℃, then adopt water-cooled with the rate of cooling of 2 ℃/s by blade water-cooled to room temperature;
Described surface strengthening heat treatment step: 952 ℃ of thermal treatment temps, to insulation after temperature 5 minutes, then adopt water-cooled with the rate of cooling of 2 ℃/s by blade water-cooled to room temperature.
The salient features of turbine blade of the present invention is as shown in the table:
Table 4:
In above operation: forging, blade mechanism processing, physical and chemical inspection, UT (Ultrasonic Testing) and clean packing are all used existing conventional process.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (9)
1. a high life turbine blade, it is characterized in that: the mass percent of its chemical composition is: C:0.29-0.31%, Si:0.16-0.19%, Mn:0.75-0.77%, Ni:0.73-0.85%, Cr:9.5-10.1%, Mo:0.55-0.64%, Sn:0.15-0.17%, V:0.11-0.15%, Sr:0.82-0.84%, Nb:0.15-0.17%, Cu:0.02-0.03%, Ti:0.13-0.15%, B:0.06-0.08%, Ca≤0.01%, S≤0.03%, P≤0.03%, rare earth metal: 0.16-0.18%, surplus is Fe.
2. high life turbine blade as claimed in claim 1, is characterized in that: the chemical composition mass percent of described rare earth metal is: cerium: 6-10%, praseodymium: 7-9%, neodymium: 10-12%, promethium: 10-11%, gadolinium: 6-8%, lutetium: 5-7%, dysprosium: 4-8%, terbium: 13-15%, surplus is lanthanum.
3. high life turbine blade as claimed in claim 2, is characterized in that: the mass percent of its chemical composition is: C:0.29%, Si:0.16%, Mn:0.75%, Ni:0.73%, Cr:9.5%, Sn:0.15%, Mo:0.55%, V:0.11%, Sr:0.82%, Nb:0.17%, Cu:0.02%, Ti:0.13%, B:0.06%, Ca:0.01%, S:0.03%, P:0.01%, rare earth metal: 0.16%, surplus is Fe;
The chemical composition mass percent of described rare earth metal is: cerium: 6%, and praseodymium: 7%, neodymium: 10%, promethium: 10%, gadolinium: 6%, lutetium: 5%, dysprosium: 4%, terbium: 13%, surplus is lanthanum.
4. high life turbine blade as claimed in claim 2, is characterized in that: the mass percent of its chemical composition is: C:0.29%, Si:0.18%, Mn:0.76%, Ni:0.75%, Cr:9.6%, Sn:0.16%, Mo:0.58%, V:0.12%, Sr:0.83%, Nb:0.15%, Cu:0.02%, Ti:0.15%, B:0.07%, Ca:0.008%, S:0.02%, P:0.02%, rare earth metal: 0.17%, surplus is Fe;
The chemical composition mass percent of described rare earth metal is: cerium: 8%, and praseodymium: 8%, neodymium: 11%, promethium: 10%, gadolinium: 7%, lutetium: 6%, dysprosium: 6%, terbium: 14%, surplus is lanthanum.
5. high life turbine blade as claimed in claim 2, is characterized in that: the mass percent of its chemical composition is: C:0.31%, Si:0.19%, Mn:0.77%, Ni:0.85%, Cr:10.1%, Sn:0.17%, Mo:0.64%, V:0.15%, Sr:0.84%, Nb:0.16%, Cu:0.06%, Ti:0.14%, B:0.08%, Ca:0.008%, S:0.01%, P:0.03%, rare earth metal: 0.18, surplus is Fe;
The chemical composition mass percent of described rare earth metal is: cerium: 10%, and praseodymium: 9%, neodymium: 12%, promethium: 11%, gadolinium: 8%, lutetium: 7%, dysprosium: 8%, terbium: 15%, surplus is lanthanum.
6. the production technique of high life turbine blade as claimed in claim 1 or 2, is undertaken by following operation: forge hot → annealing → blade mechanism processing → destressing thermal treatment → modified thermal treatment → cooling → surface strengthening thermal treatment → physical and chemical inspection → UT (Ultrasonic Testing) → clean packing; It is characterized in that:
Described annealing operation: after forge hot, at 790-795 ℃ of insulation 8-10 minute, then stove is incubated 8-9 minute after being chilled to 260-263 ℃, is finally cooled to room temperature;
Described destressing heat treatment step: adopt zone heating, first paragraph Heating temperature is 590-600 ℃, to the rear insulation of temperature 40-45min, second segment Heating temperature is 550-560 ℃, after temperature, is incubated 12-16min, then air cooling is to room temperature;
Described modified heat treatment step: adopt double tempering, tempering temperature is greater than tempering temperature for the second time for the first time; Tempering for the first time: adopt zone heating, first paragraph Heating temperature is 860-864 ℃, to the rear insulation of temperature 5-8min, second segment Heating temperature is 780-785 ℃, after temperature, is incubated 10-13min, then air cooling carries out normalizing for the second time to room temperature; Tempering for the second time: adopt zone heating, first paragraph Heating temperature is 755-758 ℃ of heating, to the rear insulation of temperature 12-14min, second segment Heating temperature is 590-600 ℃ of heating, after temperature, is incubated 5-8min;
Described refrigerating work procedure: adopt water-cooled with the rate of cooling of 7-9 ℃/s by blade water-cooled to 480-485 ℃, then adopt water-cooled with the rate of cooling of 1-3 ℃/s by blade water-cooled to room temperature;
Described surface strengthening heat treatment step: thermal treatment temp 950-955 ℃, to insulation 4-6 minute after temperature, then adopt water-cooled with the rate of cooling of 1-3 ℃/s by blade water-cooled to room temperature.
7. the production technique of high life turbine blade as claimed in claim 6, is characterized in that: described annealing operation: after forge hot, 790 ℃ of insulations 10 minutes, then stove was incubated 8 minutes after being chilled to 260 ℃, is finally cooled to room temperature;
Described destressing heat treatment step: adopt zone heating, first paragraph Heating temperature is 592 ℃, to the rear insulation of temperature 42 minutes, second segment Heating temperature was 555 ℃, after temperature, was incubated 15 minutes, then air cooling is to room temperature;
Described modified heat treatment step: adopt double tempering, tempering temperature is greater than tempering temperature for the second time for the first time; Tempering for the first time: adopt zone heating, first paragraph Heating temperature is 860 ℃, to the rear insulation of temperature 7 minutes, second segment Heating temperature was 785 ℃, after temperature, was incubated 11 minutes, then air cooling carries out normalizing for the second time to room temperature; Tempering for the second time: adopt zone heating, first paragraph Heating temperature is 755 ℃ of heating, to the rear insulation of temperature 12 minutes, second segment Heating temperature was 600 ℃ of heating, after temperature, was incubated 5 minutes;
Described refrigerating work procedure: adopt water-cooled with the rate of cooling of 7 ℃/s by blade water-cooled to 480 ℃, then adopt water-cooled with the rate of cooling of 1 ℃/s by blade water-cooled to room temperature;
Described surface strengthening heat treatment step: 950 ℃ of thermal treatment temps, to insulation after temperature 4 minutes, then adopt water-cooled with the rate of cooling of 1 ℃/s by blade water-cooled to room temperature.
8. the production technique of high life turbine blade as claimed in claim 6, is characterized in that: described annealing operation: after forge hot, 791 ℃ of insulations 10 minutes, then stove was incubated 9 minutes after being chilled to 263 ℃, is finally cooled to room temperature;
Described destressing heat treatment step: adopt zone heating, first paragraph Heating temperature is 600 ℃, to the rear insulation of temperature 45min, second segment Heating temperature is 560 ℃, after temperature, is incubated 16min, then air cooling is to room temperature;
Described modified heat treatment step: adopt double tempering, tempering temperature is greater than tempering temperature for the second time for the first time; Tempering for the first time: adopt zone heating, first paragraph Heating temperature is 864 ℃, to the rear insulation of temperature 8min, second segment Heating temperature is 785 ℃, after temperature, is incubated 13min, then air cooling carries out normalizing for the second time to room temperature; Tempering for the second time: adopt zone heating, first paragraph Heating temperature is 758 ℃ of heating, to the rear insulation of temperature 14min, second segment Heating temperature is 600 ℃ of heating, after temperature, is incubated 8min;
Described refrigerating work procedure: adopt water-cooled with the rate of cooling of 9 ℃/s by blade water-cooled to 480 ℃, then adopt water-cooled with the rate of cooling of 3 ℃/s by blade water-cooled to room temperature;
Described surface strengthening heat treatment step: 955 ℃ of thermal treatment temps, to insulation after temperature 6 minutes, then adopt water-cooled with the rate of cooling of 3 ℃/s by blade water-cooled to room temperature.
9. the production technique of high life turbine blade as claimed in claim 6, is characterized in that: described annealing operation: after forge hot, 793 ℃ of insulations 9 minutes, then stove was incubated 7 minutes after being chilled to 262 ℃, is finally cooled to room temperature;
Described destressing heat treatment step: adopt zone heating, first paragraph Heating temperature is 595 ℃, to the rear insulation of temperature 42min, second segment Heating temperature is 558 ℃, after temperature, is incubated 14min, then air cooling is to room temperature;
Described modified heat treatment step: adopt one time normalizing+double tempering, tempering temperature is greater than tempering temperature for the second time for the first time; Normalizing: 721 ℃ of formal fiery temperature are incubated 5min after temperature; Tempering for the first time: adopt zone heating, first paragraph Heating temperature is 862 ℃, to the rear insulation of temperature 7min, second segment Heating temperature is 783 ℃, after temperature, is incubated 11min, then air cooling carries out normalizing for the second time to room temperature; Tempering for the second time: adopt zone heating, first paragraph Heating temperature is 757 ℃ of heating, to the rear insulation of temperature 13min, second segment Heating temperature is 595 ℃ of heating, after temperature, is incubated 7min;
Described refrigerating work procedure: adopt water-cooled to be combined with air cooling, first adopt water-cooled with the rate of cooling of 8 ℃/s by blade water-cooled to 482 ℃, air cooling to 404 ℃ then, then adopt water-cooled with the rate of cooling of 2 ℃/s by blade water-cooled to room temperature;
Described surface strengthening heat treatment step: 952 ℃ of thermal treatment temps, to insulation after temperature 5 minutes, then adopt water-cooled with the rate of cooling of 2 ℃/s by blade water-cooled to room temperature.
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| CN107716858A (en) * | 2017-11-14 | 2018-02-23 | 张剑 | A kind of production technology of carbon steel valve |
| CN107916324A (en) * | 2017-11-14 | 2018-04-17 | 张剑 | A kind of valve spool of valve processing technology |
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