CN107400761B - The heat treatment method of advanced ultra supercritical rotor forging - Google Patents
The heat treatment method of advanced ultra supercritical rotor forging Download PDFInfo
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- CN107400761B CN107400761B CN201610341760.8A CN201610341760A CN107400761B CN 107400761 B CN107400761 B CN 107400761B CN 201610341760 A CN201610341760 A CN 201610341760A CN 107400761 B CN107400761 B CN 107400761B
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- forging
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/009—Pearlite
Abstract
The invention discloses a kind of heat treatment methods of the advanced ultra supercritical rotor forging of COST-FB2 steel, for carrying out crystal grain refinement heat treatment to the advanced ultra supercritical rotor forging of COST-FB2 steel, comprising the following steps: the first step, austenitizing processing；Second step is furnace-cooled to balance change temperature and carries out isothermal processes；Third step, speed limit, which is furnace-cooled to, comes out of the stove.The present invention directly carries out influence of high austenizing temp processing into furnace after making forging process for fuel, makes full use of waste heat after forging, heating time is short, and austenitizing effect is good, can make even tissue inside and outside forging.Invention can get pearlite type balance change tissue after equilibrium temperature isothermal transformation processing, refine grain size, cut off original coarse Structure Inheritance.Subsequent speed limit furnace is cold, can avoid the excessive internal stress of rotor forging and generates cracking.
Description
Technical field
The present invention relates to a kind of heat treatment methods of forging, and in particular to a kind of advanced ultra supercritical of COST-FB2 steel turn
The heat treatment method of sub- forging.
Background technique
Ultra supercritical coal-fired unit is current advanced generation technology mature in the world, have it is significant efficiently, energy conservation and
Environment-friendly advantage, current developed country all competitively use and develop this new technology.Chinese clean coal generation technology is also super to develop
Supercritical thermal power unit is Main way, while developing the technology is also to solve electricity shortage, improve energy utilization rate and improvement
The most real and effective approach of the problems such as environmental pollution.The advanced ultra supercritical rotor forging of COST-FB2 steel is used for 625
DEG C double reheat ultra supercritical coal-fired unit.
COST-FB2 steel belongs to 9wt%~10wt%Cr Ascalloy, and with alloying element type, more, alloy contains
Amount height and the good feature of harden ability.But the heavy forging Structure Inheritance made of the steel grade is serious, need to rotor forging after forging into
The heat treatment of row crystal grain refinement is to meet forging detection and requirement.
Existing crystal grain refinement heat-treatment technology method has: (1) critical zone is quickly heated, and obtains spherical austenite；(2) more
Secondary austenitizing recrystallizes normalized treatment.But the big, ton by the advanced ultra supercritical rotor forging section of COST-FB2 steel forging
Position is big, needs to control its heating and cooling velocity in heat treatment process, excessive to avoid internal stress in heat treatment process and split
Line, therefore can not quickly be heated by existing critical zone to control the grain size of forging.
In addition, COST-FB2 steel rotor forging Structure Inheritance is serious, normalizing is recrystallized using existing multiple austenitizing
It handles, the original coarse tissue of meeting heredity, can not effectively refine crystal grain after one side normalized treatment；On the other hand, normalizing is cooled
Cheng Zhonghui generates greatly tissue and thermal stress superposition, easily causes forging cracking.Therefore, above two prior heat treatment process
Method is unable to satisfy COST-FB2 steel forgings crystal grain refinement heat treatment requirements.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of advanced ultra supercritical rotor forgings of COST-FB2 steel
Heat treatment method, it can make rotor forging obtain preferable grain refining effect in the case where not easy to crack.
In order to solve the above technical problems, the heat treatment method of the advanced ultra supercritical rotor forging of COST-FB2 steel of the present invention
Technical solution be, comprising the following steps:
The first step, austenitizing processing；
The forging of forging completion is directly placed in the furnace to be expected that temperature is 850 ± 10 DEG C, is warming up to≤30 DEG C/h speed
1070~1100 DEG C of progress soaking isothermal holdings realize influence of high austenizing temp processing；The soaking time of soaking isothermal holding is 1.5
~2.0h/100mm.
Second step is furnace-cooled to balance change temperature and carries out isothermal processes；
Rotor forging is furnace-cooled to 700~780 DEG C of balance change temperature and carries out isothermal structural transformation, and soaking time is at least
300h；
Third step, speed limit, which is furnace-cooled to, comes out of the stove；
After isothermal structural transformation ,≤200 DEG C are furnace-cooled to≤8 DEG C/h speed limit and is come out of the stove, complete crystal grain refinement heat treatment.
What the present invention can achieve has the technical effect that
The present invention directly carries out influence of high austenizing temp processing into furnace after making forging process for fuel, makes full use of waste heat after forging,
Heating time is short, and austenitizing effect is good, can make even tissue inside and outside forging.Invention is handled by equilibrium temperature isothermal transformation
Afterwards, it can get pearlite type balance change tissue, refine grain size, cut off original coarse Structure Inheritance.Subsequent speed limit furnace is cold, can
It avoids the excessive internal stress of rotor forging and generates cracking.
Operation of the present invention is simple, and cost reduces, and energy consumption is few, can satisfy workpiece requirement.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:
Fig. 1 is the schematic diagram of the heat treatment method of the advanced ultra supercritical rotor forging of COST-FB2 steel of the present invention.
Specific embodiment
As shown in Figure 1, the heat treatment method of the advanced ultra supercritical rotor forging of COST-FB2 steel of the present invention, for pair
The advanced ultra supercritical rotor forging of COST-FB2 steel carries out crystal grain refinement heat treatment, comprising the following steps:
The first step, austenitizing processing；
After forging process for fuel completion, without air-cooled；By the forging of forging completion directly be placed in temperature for 850 ± 10 DEG C to
Expect furnace, 1070~1100 DEG C of progress soaking isothermal holdings is warming up to≤30 DEG C/h speed, soaking time is 1.5~2.0h/
(i.e. the every 100mm effective sectional area of forging keeps the temperature 1.5~2.0 hours to 100mm, if effective sectional area is 1000mm forging, needs to keep the temperature
15~20 hours), influence of high austenizing temp processing is realized, to eliminate forging stress, adjustment forging grain size and uniform formation to obtain
To good matrix；
Second step is furnace-cooled to balance change temperature and carries out isothermal processes；
Rotor forging is furnace-cooled to 700~780 DEG C of balance change temperature and carries out isothermal structural transformation, and soaking time is at least
300h changes complete pearlite type balance change tissue to obtain, refines grain size, cuts off original coarse Structure Inheritance；
Third step, speed limit, which is furnace-cooled to, comes out of the stove；
After isothermal structural transformation ,≤200 DEG C are furnace-cooled to≤8 DEG C/h speed limit and is come out of the stove, complete crystal grain refinement heat treatment.
The present invention makes COST-FB2 steel grade held for some time at 1070~1100 DEG C, and crystal grain will not sharply grow up；This
Invention comprehensively considers COST-FB2 Steel material characteristic, and the factors such as forging final forging temperature and effective cross-section size determine COST-FB2
Steel forgings crystal grain refinement heat treatment process parameter.
The present invention abandons critical zone and quickly heats, and obtains spherical austenite and multiple austenitizing recrystallization normalized treatment two
The traditional crystal grain refinement heat-treatment technology method of kind adds isothermal processes to obtain balance change group using austenite Homogenization Treatments
The method knitted refines COST-FB2 steel forgings coarse grain.
The present invention makes full use of waste heat after forging, can not only be energy saving, and forging can be made to reach Ovshinsky in the short period
Body holding temperature, adjustment forging grain size and homogeneous wrought tissue, provide good basic organization for subsequent isothermal transformation.Deng
It can get the complete pearlite type balance change tissue of transformation after temperature processing, refine grain size, cut off original coarse Structure Inheritance,
Rotor forging ultrasonic flaw detection detection sensitivity is improved, provides good basic organization for lower step property heat treatment.Together
The speed limit cooling of Shi Suihou can reduce forging internal stress, avoid forging cracking.
Claims (2)
1. a kind of heat treatment method of the advanced ultra supercritical rotor forging of COST-FB2 steel, for advanced to COST-FB2 steel
Ultra supercritical rotor forging carries out crystal grain refinement heat treatment, which comprises the following steps:
The first step, austenitizing processing；
The forging of forging completion is directly placed in the furnace to be expected that temperature is 850 ± 10 DEG C, is warming up to 1070 with≤30 DEG C/h speed
~1100 DEG C of progress soaking isothermal holdings realize influence of high austenizing temp processing；
Second step is furnace-cooled to balance change temperature and carries out isothermal processes；
Rotor forging is furnace-cooled to 700~780 DEG C of balance change temperature and carries out isothermal structural transformation, and soaking time is at least 300h；
Third step, speed limit, which is furnace-cooled to, comes out of the stove；
After isothermal structural transformation ,≤200 DEG C are furnace-cooled to≤8 DEG C/h speed limit and is come out of the stove, complete crystal grain refinement heat treatment.
2. the heat treatment method of the advanced ultra supercritical rotor forging of COST-FB2 steel according to claim 1, feature
It is, the soaking time of soaking isothermal holding is 1.5~2.0h/100mm in the first step.
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| CN201610341760.8A CN107400761B (en) | 2016-05-20 | 2016-05-20 | The heat treatment method of advanced ultra supercritical rotor forging |
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| CN109402365A (en) * | 2018-12-21 | 2019-03-01 | 扬州龙川钢管有限公司 | A kind of conditioning treatment process solving T/P91, T/P92 mixed grain structure |
| CN113667807A (en) * | 2020-05-15 | 2021-11-19 | 上海电气电站设备有限公司 | Heat-resistant steel, heat treatment method and application |
| CN114875214A (en) * | 2022-06-01 | 2022-08-09 | 东北大学 | Heat treatment method of COST-FB2 steel large forging |
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| US5716468A (en) * | 1994-12-26 | 1998-02-10 | The Japan Steel Works, Ltd. | Process for producing high-and low-pressure integral-type turbine rotor |
| CN101831535A (en) * | 2009-03-12 | 2010-09-15 | 上海重型机器锻件厂 | Heat treatment method after forging of ultra-supercritical high and medium pressure rotor steel |
| CN102134637A (en) * | 2011-01-18 | 2011-07-27 | 上海交通大学 | Method for refining grains of large medium high alloy steel forgings |
| CN103305673A (en) * | 2013-07-01 | 2013-09-18 | 江阴市恒业锻造有限公司 | Method for manufacturing fine-grain 35CrNi3MoV steel large forging stock |
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| US5716468A (en) * | 1994-12-26 | 1998-02-10 | The Japan Steel Works, Ltd. | Process for producing high-and low-pressure integral-type turbine rotor |
| CN101831535A (en) * | 2009-03-12 | 2010-09-15 | 上海重型机器锻件厂 | Heat treatment method after forging of ultra-supercritical high and medium pressure rotor steel |
| CN102134637A (en) * | 2011-01-18 | 2011-07-27 | 上海交通大学 | Method for refining grains of large medium high alloy steel forgings |
| CN103305673A (en) * | 2013-07-01 | 2013-09-18 | 江阴市恒业锻造有限公司 | Method for manufacturing fine-grain 35CrNi3MoV steel large forging stock |
| CN103343200A (en) * | 2013-07-01 | 2013-10-09 | 江阴市恒业锻造有限公司 | Short-process thermal treatment method of large 35CrNi3MoV steel forgings |
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