CN107227395A - A kind of heat treatment technics for improving the martensite type refractory steel low-temperature flexibility containing large scale M23C6 precipitated phases - Google Patents
A kind of heat treatment technics for improving the martensite type refractory steel low-temperature flexibility containing large scale M23C6 precipitated phases Download PDFInfo
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- CN107227395A CN107227395A CN201710643194.0A CN201710643194A CN107227395A CN 107227395 A CN107227395 A CN 107227395A CN 201710643194 A CN201710643194 A CN 201710643194A CN 107227395 A CN107227395 A CN 107227395A
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/004—Dispersions; Precipitations
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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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
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Abstract
The invention discloses a kind of heat treatment technics for improving the martensite type refractory steel low-temperature flexibility containing large scale M23C6 precipitated phases, martensite type refractory steel 10Cr12Ni3Mo2VN containing large scale M23C6 precipitated phases is heated to 1070~1100 DEG C, it is more than AUSTENITE GRAIN COARSENING temperature, it is incubated 30~45min, large scale M23C6 precipitated phases in tissue are eliminated by the way that high-temperature heating is quick, make microstructure homogenization, then oil cooling or dry quenching, 960~990 DEG C are again heated to after cooling, it is incubated 30~45min, pass through low-temperature heat fining austenite grains, then oil cooling or dry quenching, 670~690 DEG C of 90~120min of tempering are again heated to after secondary quenching, quenched martensite is set fully to reply by high tempering, then air cooling, the heat treatment technics for increasing temperature tempering using secondary quenching quickly eliminates large scale M23C6 precipitated phases, fining austenite grains, quenched martensite is set quickly fully to reply, so as to significantly improve the martensite type refractory steel low-temperature flexibility containing large scale M23C6 precipitated phases on the premise of good strength is ensured.
Description
Technical field
The present invention relates to ferrous materials heat treatment technics, and in particular to a kind of raising contains large scale M23C6 precipitated phases
The heat treatment technics of martensite type refractory steel low-temperature flexibility, more particularly to it is a kind of containing large scale M23C6 precipitated phases
10Cr12Ni3Mo2VN martensite type refractory steels improve the heat treatment technics of low-temperature flexibility.
Background technology
Martensite type refractory steel has excellent mechanical performances and heat-proof corrosion-resistant performance, has been widely used in super face at present
The manufacture of boundary's power generator turbine blade, with the development of super-supercritical technique, the size of turbine blade is increasing, wherein end
The length of grade blade is more than 1 meter, and the big rotating speed of exhaust stage blade size is high, by huge impulsive force during operation, and exhaust stage blade
Operating temperature is relatively low, and operating. temperature fluctuations are big, and part of generating units geographic location latitude is higher, minimum reachable -30 DEG C of room temperature
And it is following, therefore large scale exhaust stage blade has good low-temperature flexibility with martensite type refractory steel requirement now, and it is in the past right
The research of martensite type refractory steel there is no system research primarily directed to the research of its room temperature and high-temperature behavior to low-temperature flexibility.
Often there is the not enough situation of low-temperature flexibility in current martensite type refractory steel 10Cr12Ni3Mo2VN, especially works as group
Low-temperature flexibility is worse when there is large scale M23C6 precipitated phases (diameter is more than 500nm) in knitting.Research shows that large scale M23C6 is analysed
Go out relative 10Cr12Ni3Mo2VN steel room-temperature mechanical property influence smaller, at present for 10Cr12Ni3Mo2VN Heat-Treatment of Steel works
Skill mainly considers its room-temperature mechanical property of raising, and the normative heat treatment technique for the steel grade is generally 980~1010 DEG C of heating
60~90min is quenched, 550~590 DEG C of heating 120~180min tempering, and tiny austenite crystal can be obtained under the technique
Tissue, and good room-temperature mechanical property can be obtained.In order to obtain tiny austenite crystal, the conventional quenching heating-up temperature of steel
Typically below steel grade AUSTENITE GRAIN COARSENING temperature, such as 10Cr12Ni3Mo2VN steel AUSTENITE GRAIN COARSENING temperature is about 1050
DEG C, thus 10Cr12Ni3Mo2VN steel in 980~1010 DEG C of heating quenchings to obtain tiny austenite crystal, but the heat treatment
Technique do not considered when there is large scale M23C6 precipitated phases in tissue, large scale M23C6 precipitated phase solid solution speed
It is low, when there is large scale M23C6 precipitated phases in 10Cr12Ni3Mo2VN steel, after conventional quenching-tempering process heat treatment,
It is difficult to eliminate large scale M23C6 precipitated phases, low-temperature flexibility is poor, it is difficult to standard requirement is reached, in addition, using normative heat treatment technology
The underproof martensite type refractory steel forging material of low-temperature flexibility typically directly scraps processing after heat treatment, causes great waste,
Its low-temperature flexibility can be improved for these forging materials by optimizing Technology for Heating Processing, it is to avoid scrapped.
The content of the invention
In order to overcome above-mentioned deficiency, an object of the present invention is to provide a kind of improve and contains large scale M23C6 precipitated phases
The heat treatment technics of the martensite type refractory steel low-temperature flexibility of (diameter is more than 500nm), tempering is increased temperature using secondary quenching
Heat treatment technics improves the martensite type refractory steel containing large scale M23C6 precipitated phases low on the premise of good strength is ensured
Warm toughness, reduces scrapping for martensite heat-resistant steel.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of heat treatment technics for improving the martensite type refractory steel low-temperature flexibility containing large scale M23C6 precipitated phases, is adopted
With the Technology for Heating Processing of quenching-secondary quenching-tempering (QQT), wherein, (austenite crystal is thick for 1070~1100 DEG C of primary quenchings
Change more than temperature), 960~990 DEG C of secondary quenchings (being higher than Ac3 temperature, less than AUSTENITE GRAIN COARSENING temperature), 670~690 DEG C
Tempering.
The present invention is that the large scale M23C6 precipitated phases in microscopic structure are eliminated using secondary quenching, and obtains uniform tiny
Austenite crystal, while high tempering, obtains good low-temperature flexibility on the premise of proof strength.First time hardening heat
1070~1100 DEG C are brought up to, (the 10Cr12Ni3Mo2VN steel AUSTENITE GRAIN COARSENING temperature more than AUSTENITE GRAIN COARSENING temperature
1050 DEG C of degree), 30~45min of soaking makes microstructure homogenization, while can quickly eliminate large scale M23C6 in the temperature range
Precipitated phase.In addition, 10Cr12Ni3Mo2VN steel be different from some other steel grade, many steel grades AUSTENITE GRAIN COARSENING temperature with
Often partial austenitic abnormal grain growth during upper heating, produces mixed crystal phenomenon, and 10Cr12Ni3Mo2VN steel is in austenite crystal
Although crystal grain significantly increase during more than grain Coarsening Temperature 1070~1100 DEG C of heating, but has good uniformity, will not produce mixed crystal,
And large scale M23C6 precipitated phases can be quickly eliminated at this temperature.Second of hardening heat is reduced to 960~990 DEG C, is higher than
Ac3 temperature, but less than AUSTENITE GRAIN COARSENING temperature, 30~45min of soaking, in order to obtain more tiny martensite
Tissue, while soaking time shortens, it is to avoid large scale M23C6 precipitated phases are separated out again.Temperature is 670~690 DEG C, soaking
90~120min, is replied quenched martensite, reduction lattice defect and quenching by improve temperature high degree
Structural stress, is softened tissue, so that low-temperature flexibility is significantly improved.
In addition, under this tempering process, although temperature is higher, but the tempering heat time shortens, therefore
10Cr12Ni3Mo2VN hardness of steel is still higher, can be good at meeting standard requirement.
It is preferred that, the heat treatment for improving the martensite type refractory steel low-temperature flexibility containing large scale M23C6 precipitated phases
Technology, is comprised the following steps that：
Step 1, primary quenching：The martensite type refractory steel containing large scale M23C6 precipitated phases is heated to 1070 first
~1100 DEG C, more than AUSTENITE GRAIN COARSENING temperature, 30~45min of soaking makes microstructure homogenization, while quickly eliminating big chi
Very little M23C6 precipitated phases, then oil cooling or dry quenching；
Step 2, secondary quenching：960~990 DEG C are again heated to after quenching, higher than Ac3 temperature, but less than austenite crystal
Grain Coarsening Temperature, 30~45min of soaking obtains more tiny martensitic structure, while soaking time shortens, it is to avoid large scale
M23C6 precipitated phases are separated out again, then oil cooling or dry quenching；
Step 3, high tempering：It is again heated to 670~690 DEG C after secondary quenching, 90~120min of soaking, then air cooling,
Quenched martensite is replied by improve temperature high degree, reduction lattice defect and quenching structure stress, from
And it is tough to significantly improve the martensite type refractory steel low temperature containing large scale M23C6 precipitated phases on the premise of good strength is ensured
Property.
It is preferred that, described primary quenching heating is carried out in batch-type furnace, oil quenchinng.
It is preferred that, described secondary quenching heating is carried out in batch-type furnace, oil quenchinng.
It is preferred that, described tempering heating is carried out in tempering furnace, air cooling cooling.
It is preferred that, the martensite type refractory steel containing large scale M23C6 precipitated phases is 10Cr12Ni3Mo2VN geneva
Build heat resisting steel.
It is preferred that, the large scale M23C6 precipitated phases diameter is more than 500nm.
It is preferred that, the 10Cr12Ni3Mo2VN martensite type refractory steels Ingredient percent is：Cr：12.0%, Ni：
2.50%, Mo：1.65%, V：0.32%, N：0.033%, C：0.10%, Si：0.22%, Mn：0.78%.
The present invention also provides the 10Cr12Ni3Mo2VN martensite type refractory steels that a kind of above method is prepared.
Compared with prior art, the beneficial effects of the invention are as follows：
1st, the present invention is utilized two below AUSTENITE GRAIN COARSENING temperature above primary quenching, AUSTENITE GRAIN COARSENING temperature
Secondary quenching is quick to eliminate large scale M23C6 precipitated phases in 10Cr12Ni3Mo2VN steel, and the uniform tiny austenite crystal of acquisition,
High tempering, makes quenched martensite fully reply, good low-temperature flexibility is obtained on the premise of proof strength simultaneously.
2nd, the prior heat treatment technology of the conventional lower temperature quenching of present invention substitution plus lower temperature tempering, is ensureing room temperature
Reaching on the premise of mechanical property in tissue the 10Cr12Ni3Mo2VN steel low-temperature flexibilities containing large scale M23C6 precipitated phases will
Ask, it is to avoid because steel are scrapped caused by after normative heat treatment low-temperature flexibility is unqualified.
Brief description of the drawings
The Figure of description for constituting the part of the application is used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its illustrate be used for explain the application, do not constitute the improper restriction to the application.
Fig. 1 quenches for the 10Cr12Ni3Mo2VN steel that there is large scale M23C6 precipitated phases in tissue through conventional Technology for Heating Processing
Microscopic structure after fire.
Fig. 2 is to have the 10Cr12Ni3Mo2VN steel of large scale M23C6 precipitated phases in tissue secondary to quench through of the present invention
Microscopic structure after fire.
Fig. 3 is to have the 10Cr12Ni3Mo2VN steel of large scale M23C6 precipitated phases in tissue secondary to quench through of the present invention
Austenite crystal after fire.
Embodiment
It is noted that described further below is all exemplary, it is intended to provide further instruction to the application.Unless another
Indicate, all technologies used herein and scientific terminology are with usual with the those of ordinary skill of herein described technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
Embodiment 1
A kind of heat treatment technics for improving the martensite type refractory steel low-temperature flexibility containing large scale M23C6 precipitated phases, tool
Body step is as follows：
Step 1, primary quenching：It is from chemical composition：(C：0.10%, Si：0.22%, Mn：0.78%, Cr：
12.0%, Ni：2.50%, Mo：1.65%, V：0.32%, N：0.033%), and contain large scale M23C6 precipitated phases
10Cr12Ni3Mo2VN martensite type refractory steels forge material, in box type heater, are heated to 1100 DEG C of samming 30min, elimination group
Middle large scale M23C6 precipitated phases are knitted, and make microstructure homogenization, then oil quenchinng；
Step 2, secondary quenching：10Cr12Ni3Mo2VN steel after primary quenching is heated to 990 DEG C of samming 45min, makes Austria
Family name's body crystal grain refinement, then oil quenchinng；
Step 3, high tempering：10Cr12Ni3Mo2VN steel after secondary quenching is heated to 690 DEG C of samming 120min, makes to quench
Fiery martensite is fully replied, so as to improve low-temperature flexibility, is then air-cooled to room temperature.
Analysis detection
After technique heat treatment described in embodiment 1, sample austenite crystal average-size is 52 μm, and tensile strength is
997.1MPa, yield strength is 791.5MPa, and the contraction percentage of area is 63.3%, and elongation after fracture is 17.8%, -35 DEG C of ballistic works
Akv is 108.7J, and -35 DEG C of impact shear section rates are 73.1%.
Identical material, according to normative heat treatment technique：It is empty after oil quenchinng after 1000 DEG C of heating 60min, 570 DEG C of heating 2h
Cold tempering, -35 DEG C of Impact energy Ak v are 39.5J, and -35 DEG C of impact shear section rates are 31.9%.10Cr12Ni3Mo2VN steel will
Ask -35 DEG C of impact shear section rates to be more than 50%, therefore contain large scale M23C6 analysis after being heat-treated according to prior heat treatment process
The 10Cr12Ni3Mo2VN Steel Properties for going out phase do not reach requirement, and according to low temperature after scheme heat treatment described in this patent embodiment 1
Toughness is significantly improved, and disclosure satisfy that requirement.
Fig. 1 quenches for the 10Cr12Ni3Mo2VN steel that there is large scale M23C6 precipitated phases in tissue through conventional Technology for Heating Processing
Microscopic structure after fire, quenching technical is：Oil quenchinng after 1000 DEG C of heating 60min, in being organized after the quenching of normative heat treatment technique
Still suffer from thick large scale M23C6 precipitated phases.
Fig. 2 be tissue in there is the 10Cr12Ni3Mo2VN steel of large scale M23C6 precipitated phases through described in the embodiment of the present invention 1
Microscopic structure after secondary quenching, primary quenching technique is：1100 heat oil quenchinng after 30min, and secondary quenching technique is：990
Oil quenchinng after DEG C heating 45min, without thick large scale M23C6 precipitated phases in organizing after secondary quenching.
Fig. 3 is applied two described in example 1 for the 10Cr12Ni3Mo2VN steel that there is large scale M23C6 precipitated phases in tissue through the present invention
Austenite crystal after secondary quenching, primary quenching technique is：1100 heat oil quenchinng after 30min, and secondary quenching technique is：990
Oil quenchinng, fine uniform after secondary quenching after DEG C heating 45min.
Embodiment 2
A kind of heat treatment technics for improving the martensite type refractory steel low-temperature flexibility containing large scale M23C6 precipitated phases, tool
Body step is as follows：
Step 1, primary quenching：It is from chemical composition：(C：0.10%, Si：0.22%, Mn：0.78%, Cr：
12.0%, Ni：2.50%, Mo：1.65%, V：0.32%, N：0.033%), and contain large scale M23C6 precipitated phases
10Cr12Ni3Mo2VN martensite type refractory steels forge material, in box type heater, are heated to 1080 DEG C of samming 30min, elimination group
Middle large scale M23C6 precipitated phases are knitted, and make microstructure homogenization, then oil quenchinng；
Step 2, secondary quenching：10Cr12Ni3Mo2VN steel after primary quenching is heated to 990 DEG C of samming 40min, makes Austria
Family name's body crystal grain refinement, then oil quenchinng；
Step 3, high tempering：10Cr12Ni3Mo2VN steel after secondary quenching is heated to 690 DEG C of samming 120min, makes to quench
Fiery martensite is fully replied, so as to improve low-temperature flexibility, is then air-cooled to room temperature.
Embodiment 3
A kind of heat treatment technics for improving the martensite type refractory steel low-temperature flexibility containing large scale M23C6 precipitated phases, tool
Body step is as follows：
Step 1, primary quenching：It is from chemical composition：(C：0.10%, Si：0.22%, Mn：0.78%, Cr：
12.0%, Ni：2.50%, Mo：1.65%, V：0.32%, N：0.033%), and contain large scale M23C6 precipitated phases
10Cr12Ni3Mo2VN martensite type refractory steels forge material, in box type heater, are heated to 1100 DEG C of samming 40min, elimination group
Middle large scale M23C6 precipitated phases are knitted, and make microstructure homogenization, then oil quenchinng；
Step 2, secondary quenching：10Cr12Ni3Mo2VN steel after primary quenching is heated to 980 DEG C of samming 45min, makes Austria
Family name's body crystal grain refinement, then oil quenchinng；
Step 3, high tempering：10Cr12Ni3Mo2VN steel after secondary quenching is heated to 680 DEG C of samming 120min, makes to quench
Fiery martensite is fully replied, so as to improve low-temperature flexibility, is then air-cooled to room temperature.
Embodiment 4
A kind of heat treatment technics for improving the martensite type refractory steel low-temperature flexibility containing large scale M23C6 precipitated phases, tool
Body step is as follows：
Step 1, primary quenching：It is from chemical composition：(C：0.10%, Si：0.22%, Mn：0.78%, Cr：
12.0%, Ni：2.50%, Mo：1.65%, V：0.32%, N：0.033%), and contain large scale M23C6 precipitated phases
10Cr12Ni3Mo2VN martensite type refractory steels forge material, in box type heater, are heated to 1090 DEG C of samming 30min, elimination group
Middle large scale M23C6 precipitated phases are knitted, and make microstructure homogenization, then oil quenchinng；
Step 2, secondary quenching：10Cr12Ni3Mo2VN steel after primary quenching is heated to 960 DEG C of samming 45min, makes Austria
Family name's body crystal grain refinement, then oil quenchinng；
Step 3, high tempering：10Cr12Ni3Mo2VN steel after secondary quenching is heated to 680 DEG C of samming 100min, makes to quench
Fiery martensite is fully replied, so as to improve low-temperature flexibility, is then air-cooled to room temperature.
Embodiment 5
A kind of heat treatment technics for improving the martensite type refractory steel low-temperature flexibility containing large scale M23C6 precipitated phases, tool
Body step is as follows：
Step 1, primary quenching：It is from chemical composition：(C：0.10%, Si：0.22%, Mn：0.78%, Cr：
12.0%, Ni：2.50%, Mo：1.65%, V：0.32%, N：0.033%), and contain large scale M23C6 precipitated phases
10Cr12Ni3Mo2VN martensite type refractory steels forge material, in box type heater, are heated to 1080 DEG C of samming 40min, elimination group
Middle large scale M23C6 precipitated phases are knitted, and make microstructure homogenization, then oil quenchinng；
Step 2, secondary quenching：10Cr12Ni3Mo2VN steel after primary quenching is heated to 980 DEG C of samming 40min, makes Austria
Family name's body crystal grain refinement, then oil quenchinng；
Step 3, high tempering：10Cr12Ni3Mo2VN steel after secondary quenching is heated to 685 DEG C of samming 90min, makes to quench
Fiery martensite is fully replied, so as to improve low-temperature flexibility, is then air-cooled to room temperature.
Embodiment 6
A kind of heat treatment technics for improving the martensite type refractory steel low-temperature flexibility containing large scale M23C6 precipitated phases, tool
Body step is as follows：
Step 1, primary quenching：It is from chemical composition：(C：0.10%, Si：0.22%, Mn：0.78%, Cr：
12.0%, Ni：2.50%, Mo：1.65%, V：0.32%, N：0.033%), and contain large scale M23C6 precipitated phases
10Cr12Ni3Mo2VN martensite type refractory steels forge material, in box type heater, are heated to 1070 DEG C of samming 45min, elimination group
Middle large scale M23C6 precipitated phases are knitted, and make microstructure homogenization, then oil quenchinng；
Step 2, secondary quenching：10Cr12Ni3Mo2VN steel after primary quenching is heated to 970 DEG C of samming 45min, makes Austria
Family name's body crystal grain refinement, then oil quenchinng；
Step 3, high tempering：10Cr12Ni3Mo2VN steel after secondary quenching is heated to 670 DEG C of samming 120min, makes to quench
Fiery martensite is fully replied, so as to improve low-temperature flexibility, is then air-cooled to room temperature.
Although above-mentioned the embodiment of the present invention is described with reference to accompanying drawing, not to present invention protection model
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need to pay various modifications or deform still within protection scope of the present invention that creative work can make.
Claims (9)
1. a kind of heat treatment technics for improving the martensite type refractory steel low-temperature flexibility containing large scale M23C6 precipitated phases, is used
The Technology for Heating Processing of quenching-secondary quenching-tempering (QQT), it is characterised in that 1070~1100 DEG C of quenchings, 960~990 DEG C two
Secondary quenching, 670~690 DEG C of tempering.
2. the heat of the martensite type refractory steel low-temperature flexibility containing large scale M23C6 precipitated phases is improved as claimed in claim 1
Handling process, it is characterised in that comprise the following steps that：
Step 1：Primary quenching：The martensite type refractory steel containing large scale M23C6 precipitated phases is heated to 1070 first~
1100 DEG C, more than AUSTENITE GRAIN COARSENING temperature, 30~45min of soaking makes microstructure homogenization, while quickly eliminating large scale
M23C6 precipitated phases, then oil cooling or dry quenching；
Step 2, secondary quenching：960~990 DEG C are again heated to after quenching, higher than Ac3 temperature, but it is thick less than austenite crystal
Change temperature, 30~45min of soaking obtains more tiny martensitic structure, while soaking time shortens, it is to avoid large scale
M23C6 precipitated phases are separated out again, then oil cooling or dry quenching；
Step 3, high tempering：It is again heated to 670~690 DEG C after secondary quenching, 90~120min of soaking, then air cooling, passes through
That improves temperature high degree is replied quenched martensite, reduction lattice defect and quenching structure stress, so that
Ensure to significantly improve the martensite type refractory steel low-temperature flexibility containing large scale M23C6 precipitated phases on the premise of good strength.
3. the heat of the martensite type refractory steel low-temperature flexibility containing large scale M23C6 precipitated phases is improved as claimed in claim 1
Handling process, it is characterised in that the martensite type refractory steel containing large scale M23C6 precipitated phases is 10Cr12Ni3Mo2VN
Steel.
4. the heat of the martensite type refractory steel low-temperature flexibility containing large scale M23C6 precipitated phases is improved as claimed in claim 3
Handling process, it is characterised in that the large scale M23C6 precipitated phases diameter is more than 500nm.
5. the heat of the martensite type refractory steel low-temperature flexibility containing large scale M23C6 precipitated phases is improved as claimed in claim 3
Handling process, it is characterised in that the 10Cr12Ni3Mo2VN martensite type refractory steels Ingredient percent is：Cr：
12.0%, Ni：2.50%, Mo：1.65%, V：0.32%, N：0.033%, C：0.10%, Si：0.22%, Mn：0.78%.
6. martensite type refractory steel low-temperature flexibility of the raising containing large scale M23C6 precipitated phases as described in being required claim 1
Technology for Heating Processing, it is characterised in that described primary quenching heating-up temperature be AUSTENITE GRAIN COARSENING temperature more than.
7. martensite type refractory steel of the raising containing large scale M23C6 precipitated phases as described in claim 1 any claim
The Technology for Heating Processing of low-temperature flexibility, it is characterised in that described secondary quenching heating-up temperature is 960~990 DEG C.
8. martensite type refractory steel of the raising containing large scale M23C6 precipitated phases as described in claim 1 any claim
The Technology for Heating Processing of low-temperature flexibility, it is characterised in that described tempering heating-up temperature is 670~690 DEG C.
9. a kind of 10Cr12Ni3Mo2VN steel prepared such as claim 1-8 either method.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN108031779A (en) * | 2017-11-29 | 2018-05-15 | 无锡透平叶片有限公司 | A kind of turbine blade and preparation method thereof |
| CN109852778A (en) * | 2019-02-22 | 2019-06-07 | 无锡宏达重工股份有限公司 | The heat treatment process of 10Cr9MoW2VNbBN crystal grain refinement |
| CN117025901A (en) * | 2023-10-10 | 2023-11-10 | 成都先进金属材料产业技术研究院股份有限公司 | Heat treatment method for improving low-temperature impact toughness of 13Cr martensitic stainless steel |
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