CN110527794A - A kind of heat treatment method of micro-nano structure bainitic steel - Google Patents
A kind of heat treatment method of micro-nano structure bainitic steel Download PDFInfo
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- CN110527794A CN110527794A CN201910843015.7A CN201910843015A CN110527794A CN 110527794 A CN110527794 A CN 110527794A CN 201910843015 A CN201910843015 A CN 201910843015A CN 110527794 A CN110527794 A CN 110527794A
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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
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
-
- 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
- C21D6/04—Hardening by cooling below 0 degrees Celsius
-
- 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
- C21D2211/001—Austenite
-
- 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
- C21D2211/002—Bainite
Abstract
The present invention relates to a kind of heat treatment methods of micro-nano structure bainitic steel.Its technical solution is: by micro-nano structure bainitic steel, austenitizing, isothermal time are 0.25~0.75h under the conditions of Ac3+ (20~120) DEG C；Then a step low temperature bainite transformation is carried out under the conditions of Bf+ (10~60) DEG C, isothermal time is 1.0~6.0h.Two step low temperature bainite transformations are carried out under the conditions of Ms- (10~60) DEG C, isothermal time is 4.0~24.0h；Or the distribution transformation of two step carbon is carried out under the conditions of Bs+ (10~150) DEG C, isothermal time is 0.1~2.0h；Last water quenching is to room temperature；Or two step subzero treatments transformation is carried out under the conditions of -100~-196 DEG C, isothermal time is 0.5~4.0h.Last water quenching is to room temperature.In the chemical component of the micro-nano structure bainitic steel: C is 0.20~1.00wt%, and Si is 0.80~2.00wt%.The present invention has the characteristics that simple process, heat treatment cycle are short and can refine blocky retained austenite.
Description
Technical field
The invention belongs to bainitic steel technical fields.More particularly to a kind of heat treatment method of micro-nano structure bainitic steel.
Background technique
High-carbon micro-nano structure bainitic steel (also known as nanometer bainitic steel, low temperature bainitic steel, super bainitic steel etc.), benefit
Bainite transformation temperature (200~300 DEG C) are significantly reduced with high C, while high Si inhibits the precipitation of cementite, bainite turns completely
Change takes a long time (several days even tens days), and obtained retained austenite volume fraction is general >=20vol%.Retained austenite
There are two types of pattern, a kind of film-form retained austenites being distributed across between bainite ferrite lath can effectively improve tough for body
Property；Another kind is is distributed in the blocky retained austenite (accounting for about 50~75vol% of retained austenite) between bainite beam, to tough
Property contribution it is smaller or even harmful.Meanwhile prolonged constant temperature process, diffusion of the carbon from bainite ferrite to austenite is carried out
Control be it is very difficult, cause the uneven distribution of retained austenite content, be also unfavorable for the raising of toughness.
Studies have shown that micro-nano structure bainitic steel toughness can be improved by reducing carbon content, since carbon content is reduced,
Bainite starts transition temperature (Bs) and martensite start temperature (Ms) temperature spot increases, during heat treatment, bayesian
Body isothermal transformation obtains submicron order bainite ferrite, film-form and bulk and does not change austenite；Bulk does not change austenite
It is changed into lath martensite tissue in subsequent quenching process, this oversaturated martensite of carbon is unfavorable for the raising of toughness.Together
When, bainitic steel can be by two steps or multistep low temperature bainite transformation technique, and not changing blocky austenite can further turn
Become bainite ferrite, blocky retained austenite can be eliminated substantially, not change austenite with reduction bulk to avoid quenching
Martensite is formed, and toughness is further increased.
Patented technology in terms of existing multistep bainite transformation is substantially multi-process, and production technology is complicated.
" a kind of ultrahigh-intensity high-toughness multistep Isothermal Bainite steel and preparation method thereof " (CN103555896A), specific work
Skill are as follows: 1. austenitizing 0.2~5.0 hour under the conditions of 850~1100 DEG C；2. the first step is in 250~450 DEG C of isothermals 0.2~3.0
Hour；3. second step 220~350 DEG C isothermal 2~50 hours；4. third step was at l80~250 DEG C isothermal 24~240 hours；⑤
4th step 150~220 DEG C isothermal 50~360 hours, using two steps, three steps or four step bainite long-time isothermals, bayesian
The body isothermal transformation time is very long.
" a kind of preparation method of the ultra-fine bainitic steel of high tenacity medium high carbon " (CN106521350A), specifically comprises the processes of: 1.
850~910 DEG C of heating, soaking in 0.2~1.0 hour；2. being down to 450~600 DEG C with the rate of temperature fall of 10~20 DEG C/s；3. carry out
Single pass or two pass time rolling deformation, deflection is 15~19% per pass, and total deformation is 15~33%；4. finishing temperature is
400~520 DEG C, obtain deformed steel material；Deformed steel material is carried out two step isothermals: 5. the first step is in 300~340 DEG C of items
0.1~1.0 hour is kept the temperature under part；6. second step keeps the temperature 1~4 hour in 220~270 DEG C of conditions, it is then air-cooled to room temperature, is manufactured
Technique uses high temperature diffusion annealingMedium temperature deformation techniqueIt is classified Isothermal Bainite heat treatment.
" ultrahigh-intensity high-toughness carbides-free bainite wear resistant steel plate and preparation method thereof " (CN106544591A), specifically
Technique are as follows: be 1. heated to 900~950 DEG C of 1~3h of austenitizing；2. with 80~100 DEG C/min be cooled to 400 DEG C of isothermals 2~
5min；3. being cooled to 2~5min of Ms temperature isothermal with 5~10 DEG C/min；4. being cooled to room temperature with 10~20 DEG C/min；5. heating
To 100~200 DEG C of 0.5~1.0h of isothermal；Continue to be heated to 260~290 DEG C of 2~3h of isothermal.The preparation method uses bainite
IsothermalMs temperature isothermalCooling room temperatureTemperingStabilization of austenite processing.
Existing carbon distribution transformation aspect patented technology adds one of carbon distribution technique all on original Process ba- sis substantially,
So that carbon is diffused into austenite from martensite or bainite, form rich carbon austenitic, austenite continues to turn in cooling procedure
Become martensite, heat treatment procedure is more, and production technology is complicated.
" heat treatment method for improving quenched steel component mechanical property is distributed and be tempered using carbon " (CN101121955A), specifically
Technique are as follows: 1. workpiece austenitizing；2. in liquid quenching medium of quenching for the first time；It is protected 3. being quenched again into 250~450 DEG C of medium
100~1800s of temperature, quenches into water, and 4. 150~250 DEG C, tempering time 100~1800s lonneal, manufacturing process, which uses, quenches
FireCarbon distributionTempering heat treatment, production technology are relative complex.
" a kind of that the process for improving high-strength steel containing Cr and prolonging toughness is distributed using carbon " (CN101705345A), concrete technology
Are as follows: 1. steel part heats 850~960 DEG C, makes its complete austenitizing；2. being chilled to 250~350 DEG C, cooling velocity 25~200
DEG C/s, keep the temperature 10~1200s；3. being heated rapidly to 360~500 DEG C, heating speed is greater than 40 DEG C/s, keeps the temperature 600~1800s；
It is air-cooled to room temperature again, manufacturing process is quenched using chillingHeating carbon distribution rapidly, very big cooling and heating rate are difficult to control
System, production difficulty are big.
" based on quenching-carbon distribution theory low-carbon Si-Mn system hot rolling Multiphase Steel and manufacturing method " (CN109338229A),
Specifically comprises the processes of: slab or ingot are 1. heated to 1190~1210 DEG C, keep the temperature 1~1.5h, start rolling temperature austenite completely again
1170~1190 DEG C of crystal region carry out roughing, and adding up deflection is 50~70%, obtain intermediate base；2. to intermediate base temperature
10~50 DEG C of Ar3 or more the progress above finish rolling of two passages are down in reduction, and for finishing temperature in Ar3 ± 10 DEG C, adding up deflection is 75
~90%；3. being cooled to 820~840 DEG C with the cooling rate of 5~10 DEG C/s, 4. 230 are cooled to the cooling rate of 100~150 DEG C/s~
A certain temperature between 280 DEG C, finally simulation is batched, and is slowly cooled to room temperature with furnace, and manufacturing process is using heatingRoughing
Finish rollingRelaxationOn-line coolingPartition, production procedure is long, and step is more.
Patent adds one of depths reason all on original Process ba- sis substantially in terms of existing subzero treatment, makes retained austenite
Body continues to be changed into martensite and carbide, and heat treatment procedure is more, and production technology is complicated.For example, " a kind of steel material is quenched
Fire-partition-deep cooling-tempering technique " (CN108285965A), specifically comprises the processes of: 1. complete austenitizing processing or part
Austenitizing processing；2. being cooled to Ms or less to be quenched；3. carrying out partition processing, partition temperature is a certain of Ms or more
Temperature is equal to hardening heat, is cooled to room temperature；4. carrying out subzero treatment, then it is warming up to room temperature；5. tempering, using quenchingPartitionDeep coolingTempering." a method of improve quenched and tempered state low-alloy nodular bainite steel impact flexibility "
(CN109207693A), specifically comprises the processes of: 1. quench, within the scope of 40 DEG C~100 DEG C of Ac3 or more, soaking time range is 0.5
~for 24 hours, it is cooling；2. middle lonneal, tempering range is 150~550 DEG C, soaking time range is 0.5~for 24 hours, it is cooling
Mode is air-cooled；Or subzero treatment, 2~10h is impregnated in liquid nitrogen；3. high tempering is handled, manufacturing process is using quenchingIn
Lonneal or subzero treatmentHigh tempering heat treatment." a method of improve the intensity and wearability of nanometer bainitic steel "
(CN108642256A), specifically comprises the processes of: 1. austenitizing；2. isothermal hardening；3. cold treatment includes with the drop of 2~5 DEG C/min
Warm rate is down to -200~-180 DEG C；4. Mild Hypothermal tempering is that steel after subzero treatment is heated up with the rate of 2~5 DEG C/min
8~12h is kept the temperature to 100~250 DEG C, manufacturing process uses isothermal hardeningCold treatmentThe processing of Mild Hypothermal tempering.
Summary of the invention
The present invention is directed to overcome above-mentioned technological deficiency, it is therefore an objective to it is short and can be thin to provide a kind of simple process, heat treatment cycle
Change the heat treatment method of the micro-nano structure bainitic steel of blocky retained austenite.
To achieve the above object, the technical solution adopted by the present invention is that:
By micro-nano structure bainitic steel under the conditions of Ac3+ (20~120) DEG C austenitizing, isothermal time be 0.25~
0.75h；Then a step low temperature bainite transformation is carried out under the conditions of Bf+ (10~60) DEG C, isothermal time is 1.0~6.0h；Again
Two step low temperature bainite transformations are carried out under the conditions of Ms- (10~60) DEG C, isothermal time is 4.0~24.0h；Last water quenching is to room
Temperature.
Or by micro-nano structure bainitic steel under the conditions of Ac3+ (20~120) DEG C austenitizing, isothermal time be 0.25~
0.75h；Then a step low temperature bainite transformation is carried out under the conditions of Bf+ (10~60) DEG C, isothermal time is 1.0~6.0h；Again
The distribution transformation of two step carbon is carried out under the conditions of Bs+ (10~150) DEG C, isothermal time is 0.1~2.0h；Last water quenching is to room temperature.
Or by micro-nano structure bainitic steel under the conditions of Ac3+ (20~120) DEG C austenitizing, isothermal time be 0.25~
0.75h；Then a step low temperature bainite transformation is carried out under the conditions of Bf+ (10~60) DEG C, isothermal time is 1.0~6.0h；Again
Two step subzero treatments transformation is carried out under the conditions of -100~-196 DEG C, isothermal time is 0.5~4.0h；Last water quenching is to room temperature.
In the chemical component of the micro-nano structure bainitic steel: C be 0.20~0.50wt%, Si be 1.00~
2.00wt%.
By micro-nano structure bainitic steel under the conditions of Ac3+ (20~120) DEG C austenitizing, isothermal time be 0.25~
0.75h；Then a step low temperature bainite transformation is carried out under the conditions of Bf+ (10~60) DEG C, isothermal time is 1.0~6.0h；Again
Two step low temperature bainite transformations are carried out under the conditions of Ms- (10~60) DEG C, isothermal time is 4.0~24.0h；Last water quenching is to room
Temperature；
Or by micro-nano structure bainitic steel under the conditions of Ac3+ (20~120) DEG C austenitizing, isothermal time be 0.25~
0.75h；Then a step low temperature bainite transformation is carried out under the conditions of Bf+ (10~60) DEG C, isothermal time is 1.0~6.0h；Again
The distribution transformation of two step carbon is carried out under the conditions of Bs+ (10~150) DEG C, isothermal time is 0.1~2.0h；Last water quenching is to room temperature；
Or by micro-nano structure bainitic steel under the conditions of Ac3+ (20~120) DEG C austenitizing, isothermal time be 0.25~
0.75h；Then a step low temperature bainite transformation is carried out under the conditions of Bf+ (10~60) DEG C, isothermal time is 1.0~6.0h；Again
Two step subzero treatments transformation is carried out under the conditions of -100~-196 DEG C, isothermal time is 0.5~4.0h；Last water quenching is to room temperature.
In the chemical component of the micro-nano structure bainitic steel: C be 0.20~1.00wt%, Si be 0.80~
2.00wt%.
Due to using the technical solution, the present invention has following good effect compared with prior art:
The present invention is using two step low temperature bainite transformations or using low temperature bainite+carbon distribution transformation or uses low temperature shellfish
The heat treatment process of family name's body+subzero treatment short time fast transition.
(1) two step low temperature bainite transformation
Austenitizing under the conditions of Ac3+ (20~120) DEG C, isothermal time are 0.25~0.75h；Complete austenitizing, shape
At tiny austenite grain (when Ac3 is that sub-eutectoid steel heats, ferrite is completely transformed into the temperature of austenite)；
Then a step low temperature bainite transformation is carried out under the conditions of Bf+ (10~60) DEG C, isothermal time is 1.0~6.0h:
Austenite is changed into bainite ferrite, and the bainite ferrite lath, film-form austenite and bulk for forming micro-nano structure are difficult to understand
Family name's body tissue (Bf is that bainite terminates transition temperature)；
Two step low temperature bainite transformations are carried out under the conditions of Ms- (10~60) DEG C, isothermal time is 4.0~24.0h；Block
Shape austenite continues to be changed into bainite ferrite lath (Ms is martensite start temperature)；
Last water quenching is to room temperature；Ultimately form bainite ferrite lath, the secondary bainite ferrite sheet of micro-nano structure
Item and film-form retained austenite body tissue, blocky austenite are divided and are refined by newly-generated bainite ferrite.
(2) low temperature bainite+carbon distribution transformation
Austenitizing under the conditions of Ac3+ (20~120) DEG C, isothermal time are 0.25~0.75h；Complete austenitizing, shape
At tiny austenite grain (when Ac3 is that sub-eutectoid steel heats, ferrite is completely transformed into the temperature of austenite)；
Then a step low temperature bainite transformation is carried out under the conditions of Bf+ (10~60) DEG C, isothermal time is 1.0~6.0h；
Austenite is changed into bainite, forms the bainite ferrite lath, film-form austenite and blocky austenite group of micro-nano structure
Knit (Bf is that bainite terminates transition temperature)；
The distribution transformation of two step carbon is carried out under the conditions of Bs+ (10~150) DEG C, isothermal time is 0.1~2.0h；Bainite
Carbon in ferrite spreads (Bs is that bainite starts transition temperature) into austenite；
Last water quenching is to room temperature；Blocky austenite continues to be changed into martensite, ultimately forms the bainite iron of micro-nano structure
Ferritic lath, secondary martensite lath, film-form retained austenite, blocky austenite is by newly-generated martensite segmentation and carefully
Change.
(3) low temperature bainite+subzero treatment
Austenitizing under the conditions of Ac3+ (20~120) DEG C, isothermal time are 0.25~0.75h；Complete austenitizing, shape
At tiny austenite grain (when Ac3 is that sub-eutectoid steel heats, ferrite is completely transformed into the temperature of austenite)；
Then a step low temperature bainite transformation is carried out under the conditions of Bf+ (10~60) DEG C, isothermal time is 1.0~6.0h；
Austenite is changed into bainite, forms the bainite ferrite lath, film-form austenite and blocky austenite group of micro-nano structure
Knit (Bf is that bainite terminates transition temperature)；
Two step subzero treatments transformation is carried out under the conditions of -100~-196 DEG C, isothermal time is 0.5~4.0h；It is blocky difficult to understand
Family name's body continues to be changed into martensite and carbide；
Last water quenching is to room temperature；Ultimately form the bainite ferrite lath of micro-nano structure, secondary martensite lath and thin
Membranaceous retained austenite body tissue, blocky austenite are divided and are refined by newly-generated martensite.
Bainite ferrite is as intensity phase, and bainite ferrite is micro/nano level, and is in hypersaturated state, to shellfish
Family name's body tissue plays strong refined crystalline strengthening and solution strengthening effect；Retained austenite is toughness phase, is distributed in bainite iron element
It on body lath or between lath, can be plastically deformed under by external force, absorb and consume energy, delay the expansion of crackle
Exhibition, it is extremely beneficial to the toughness for improving plate, induced plasticity effect can be undergone phase transition when stress is larger, further improved
The obdurability of steel.
The technical solution that the present invention further limits are as follows: high C and high Si is low in the micro-nano structure bainitic steel use
Design of alloy.
Carbon: C plays the role of solution strengthening in steel, in order to reach superhigh intensity and hardness level, needed in steel containing
The C of high level.In view of the obdurability matching of steel plate, the C content in steel plate of the present invention is 0.20~1.00%.
Silicon: Si inhibits the precipitation of cementite in bainitic steel, additionally it is possible to ferrite is dissolved in, to play the work of solution strengthening
With, and then the intensity and hardness of steel plate are improved, the Si content in steel plate of the present invention is 0.80~2.00%.
Micro-nano structure bainitic steel after heat treatment method heat treatment, the blocky retained austenite in tissue are obvious
Refinement.
Therefore, the present invention has the characteristics that simple process, heat treatment cycle are short and can refine blocky retained austenite.
Detailed description of the invention
Fig. 1 is that the present invention obtains a kind of micro-nano structure bainitic steel using the heat treatment method of two step low temperature bainite transformations
A kind of optical microscopy map of the bainitic steel arrived；
Fig. 2 is that micro-nano structure bainitic steel described in Fig. 1 is shown with the bainitic steel optics that Conventional cryogenic bainite transformation obtains
Micro- figure；
Fig. 3 is the heat treatment that the present invention changes another micro-nano structure bainitic steel using low temperature bainite+carbon distribution
A kind of optical microscopy map for bainitic steel that method obtains；
Fig. 4 is that micro-nano structure bainitic steel described in Fig. 3 is shown with the bainitic steel optics that Conventional cryogenic bainite transformation obtains
Micro- figure；
Fig. 5 is the micro-nano structure bainitic steel of the invention by ingredient shown in Fig. 3 using low temperature bainite+subzero treatment heat
A kind of optical microscopy map for bainitic steel that processing method obtains；
Fig. 6 is that micro-nano structure bainitic steel described in Fig. 5 is shown with the bainitic steel optics that Conventional cryogenic bainite transformation obtains
Micro- figure.
Specific embodiment
The invention will be further described With reference to embodiment, and it is not intended to limit the protection scope of the present invention.
Embodiment 1
A kind of heat treatment method of micro-nano structure bainitic steel.By the micro-nano structure bainitic steel Ac3+ (20~
DEG C 120) austenitizing under the conditions of, isothermal time are 0.25~0.75h；Then a step is carried out under the conditions of Bf+ (10~60) DEG C
Low temperature bainite transformation, isothermal time are 1.0~6.0h；Two step low temperature bainites are carried out under the conditions of Ms- (10~60) DEG C
Transformation, isothermal time are 4.0~24.0h；Last water quenching is to room temperature.
In the micro-nano structure bainitic steel: C is 0.20~1.00wt%, and Si is 0.80~2.00wt%.
Micro-nano structure bainitic steel after the heat treatment of the heat treatment method described in the present embodiment, the blocky retained austenite in tissue
Family name's body obviously refines.
Embodiment 2
A kind of heat treatment method of micro-nano structure bainitic steel.By the micro-nano structure bainitic steel Ac3+ (20~
DEG C 120) austenitizing under the conditions of, isothermal time are 0.25~0.75h；Then a step is carried out under the conditions of Bf+ (10~60) DEG C
Low temperature bainite transformation, isothermal time are 1.0~6.0h；The distribution of two step carbon is carried out under the conditions of Bs+ (10~150) DEG C to turn
Become, isothermal time is 0.1~2.0h；Last water quenching is to room temperature.
In the micro-nano structure bainitic steel: C is 0.20~1.00wt%, and Si is 0.80~2.00wt%.
Micro-nano structure bainitic steel after the heat treatment of the heat treatment method described in the present embodiment, the blocky retained austenite in tissue
Family name's body obviously refines.
Embodiment 3
A kind of heat treatment method of micro-nano structure bainitic steel.By the micro-nano structure bainitic steel Ac3+ (20~
DEG C 120) austenitizing under the conditions of, isothermal time are 0.25~0.75h；Then a step is carried out under the conditions of Bf+ (10~60) DEG C
Low temperature bainite transformation, isothermal time are 1.0~6.0h；Two step subzero treatments are carried out under the conditions of -100~-196 DEG C to turn
Become, isothermal time is 0.5~4.0h；Last water quenching is to room temperature.
In the micro-nano structure bainitic steel: C is 0.20~1.00wt%, and Si is 0.80~2.00wt%.
Micro-nano structure bainitic steel after the heat treatment of the heat treatment method described in the present embodiment, the blocky retained austenite in tissue
Family name's body obviously refines.
Present embodiment is using two step low temperature bainite transformations or low temperature bainite+carbon distribution transformation or low temperature
The heat treatment process of bainite+subzero treatment short time fast transition.
The micro-nano structure bainitic steel obtained after present embodiment is heat-treated such as attached drawing 1, attached drawing 3 and attached drawing 5
Shown, attached drawing 2, attached drawing 4 and attached drawing 6 are the micro-nano structure bainitic steels of identical component corresponding with attached drawing 1, attached drawing 3 and attached drawing 5
Using the comparison diagram after Conventional cryogenic bainite transformation.
Fig. 1 is that embodiment 1 turns the micro-nano structure bainitic steel of 10.30C-1.5Si ingredient using two step low temperature bainites
A kind of optical microscopy map for bainitic steel that the heat treatment method of change obtains, Fig. 2 are micro-nano structure bainitic steels described in Fig. 1 with often
Advise a kind of bainitic steel optical microscopy map of low temperature bainite transformation；
Fig. 3 is that embodiment 2 distributes the micro-nano structure bainitic steel of 10.95C-1.0Si ingredient using low temperature bainite+carbon
A kind of optical microscopy map for bainitic steel that the heat treatment method of transformation obtains, Fig. 4 are that micro-nano structure bainitic steel described in Fig. 3 is used
A kind of bainitic steel optical microscopy map of Conventional cryogenic bainite transformation；
Fig. 5 is that embodiment 3 uses the micro-nano structure bainitic steel of 10.95C-1.0Si ingredient at low temperature bainite+deep cooling
A kind of optical microscopy map for bainitic steel that the heat treatment method of reason obtains, Fig. 6 are micro-nano structure bainitic steels described in Fig. 5 with often
Advise a kind of bainitic steel optical microscopy map of low temperature bainite transformation.
It will be seen from figure 1 that the micro-nano structure bainitic steel of the 0.30C-1.5Si ingredient, by two step low temperature bayesian
Body transformation, compared with the micro-nano structure bainitic steel Conventional cryogenic bainite transformation of the identical component described in Fig. 2, bulk residual
Austenite obviously refines.
From figure 3, it can be seen that the micro-nano structure bainitic steel of the 0.95C-1.0Si ingredient, by low temperature bainite+carbon
Distribution transformation, it is blocky residual compared with the micro-nano structure bainitic steel Conventional cryogenic bainite transformation of the identical component described in Fig. 4
Austenite is stayed obviously to refine.
From fig. 5, it can be seen that the micro-nano structure bainitic steel of the 0.95C-1.0Si ingredient, by low temperature bainite+depth
Cold treatment, compared with the micro-nano structure bainitic steel Conventional cryogenic bainite transformation of the identical component described in Fig. 6, bulk residual
Austenite obviously refines.
Heat treatment method described in present embodiment obtain micro-nano structure bainite microscopic structure be ferrite lath,
Secondary bainite ferrite lath is martensite, film-form retained austenite, and blocky austenite is by newly-generated bainite iron
Ferritic or martensite segmentation and refinement.For bainite ferrite as intensity phase, bainite ferrite is micro/nano level, and is in
Hypersaturated state plays strong refined crystalline strengthening and solution strengthening effect to bainite structure；Retained austenite is toughness phase, point
Cloth can be plastically deformed under by external force on bainite ferrite lath or between lath, absorb and consume energy
Amount, delays the extension of crackle, extremely beneficial to the toughness for improving plate, and induced plasticity effect can be undergone phase transition when stress is larger
It answers, further improves the obdurability of steel, the micro-nano structure bainitic steel after present embodiment heat treatment, blocky retained austenite
The refinement of family name's body, the ultra-high strength bainite with excellent mechanical property.
Therefore, present embodiment has simple process, heat treatment cycle short and can refine blocky retained austenite
Feature.
Claims (2)
1. a kind of heat treatment method of micro-nano structure bainitic steel, it is characterised in that the heat treatment method is:
By micro-nano structure bainitic steel, austenitizing, isothermal time are 0.25~0.75h under the conditions of Ac3+ (20~120) DEG C；
Then a step low temperature bainite transformation is carried out under the conditions of Bf+ (10~60) DEG C, isothermal time is 1.0~6.0h；Then at Ms-
Two step low temperature bainite transformations are carried out under the conditions of (10~60) DEG C, isothermal time is 4.0~24.0h；Last water quenching is to room temperature；
Or by micro-nano structure bainitic steel under the conditions of Ac3+ (20~120) DEG C austenitizing, isothermal time be 0.25~
0.75h；Then a step low temperature bainite transformation is carried out under the conditions of Bf+ (10~60) DEG C, isothermal time is 1.0~6.0h；Again
The distribution transformation of two step carbon is carried out under the conditions of Bs+ (10~150) DEG C, isothermal time is 0.1~2.0h；Last water quenching is to room temperature；
Or by micro-nano structure bainitic steel under the conditions of Ac3+ (20~120) DEG C austenitizing, isothermal time be 0.25~
0.75h；Then a step low temperature bainite transformation is carried out under the conditions of Bf+ (10~60) DEG C, isothermal time is 1.0~6.0h；Again
Two step subzero treatments transformation is carried out under the conditions of -100~-196 DEG C, isothermal time is 0.5~4.0h；Last water quenching is to room temperature.
2. the heat treatment method of micro-nano structure bainitic steel according to claim 1, it is characterised in that the micro-nano structure shellfish
In the chemical component of family name's body steel: C is 0.20~1.00wt%, and Si is 0.80~2.00wt%.
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Application publication date: 20191203 |