CN103862148B - Nanometer bainitic steel Austenite Grain Refinement accelerates the method for nanometer again - Google Patents

Nanometer bainitic steel Austenite Grain Refinement accelerates the method for nanometer again Download PDF

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CN103862148B
CN103862148B CN201410127463.4A CN201410127463A CN103862148B CN 103862148 B CN103862148 B CN 103862148B CN 201410127463 A CN201410127463 A CN 201410127463A CN 103862148 B CN103862148 B CN 103862148B
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nanometer
bainitic steel
temperature
welding
extrusion device
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CN103862148A (en
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方坤
杨建国
方洪渊
刘雪松
董志波
彭小益
马然
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Harbin Institute of Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/23—Arc welding or cutting taking account of the properties of the materials to be welded
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/02—Seam welding; Backing means; Inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K9/00—Arc welding or cutting
    • B23K9/22—Percussion welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/02—Iron or ferrous alloys
    • B23K2103/04—Steel or steel alloys

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  • Heat Treatment Of Steel (AREA)

Abstract

Nanometer bainitic steel Austenite Grain Refinement accelerates the method for nanometer again.The present invention relates to high-strength steel welding field, particularly relate to a kind of first plastic deformation again Static Recrystallization fining austenite grains accelerate again the method for nanometer.The present invention is for solving the existing nanometer bainitic steel problem that the nanometer welding process time is long and industrial applications is difficult again.The present invention adopts and impacts rotary squeezing automatic welding device with weldering, make the high-temperature metal of weld dimensions that a large amount of plastic deformation occur, the method utilizing flame to heat before being cooled to martensite transformation temperature, make the metal generation Static Recrystallization be out of shape, fining austenite grains, shortens the nanometer time again.

Description

Nanometer bainitic steel Austenite Grain Refinement accelerates the method for nanometer again
Technical field
The present invention relates to high-strength steel welding field, particularly relate to a kind of first plastic deformation again Static Recrystallization fining austenite grains accelerate again the method for nanometer.
Background technology
Nanometer bainitic steel is the steel grade of new generation having maximum intensity rank existed at present, and its ultimate tensile strength can reach 2.5GPa, and yield strength reaches 1.7GPa, and hardness is 600 ~ 700HV, and fracture toughness is 30 ~ 40MPam 1/2, percentage elongation reaches about 30%.The phosphorus content of this steel is about 0.78%, and the element silicon containing certain content is to suppress the precipitation of carbide, be obtain in a little higher than martensite transformation temperature isothermal transformation a couple of days, microstructure is the nano-sheet austenite of carbides-free the nano-sheet bainite of separating out and a large amount of carbon of solid solution remained.Because carbon equivalent is very high, the weldability extreme difference of this steel, performance severe exacerbation compared with mother metal of welding point, its conventional welding line and heat affected area are organized and are very easily changed firmly crisp martensitic structure into, thus cause the generation of cold crack.
The welding procedure of nanometer again of current nanometer bainitic steel can realize the high-quality welding of this material, its general principle is: use for reference by the austenite of uniform composition being made to change the method for nanometer bainite in the insulation of bainitic transformation temperature range, welding cooling course is controlled in welding cooling procedure, make the tissue through welding high temperature melting and austenitizing, when being cooled fast to bainitic transformation temperature range, isothermal holding being carried out to it, being finally converted into as organizing consistent nanometer bainite structure with mother metal.Due to the tissue that nanometer bainite structure is the maximum intensity rank existed at present, this method can make the tissue of welding point still keep nanometer bainite structure after welding thermal process, thus obtains high performance welding point.
Although nanometer welding method effectively can solve the Welding Problems of nanometer bainitic steel and obtain and the equicohesive welding point of mother metal again, it is long that this method also exists the processing time, the problem of industrial applications difficulty.
Summary of the invention
The present invention is for solving the existing nanometer bainitic steel problem that the nanometer welding process time is long and industrial applications is difficult again, and provides a kind of nanometer bainitic steel Austenite Grain Refinement to accelerate the method for nanometer again.
The method that nanometer bainitic steel Austenite Grain Refinement of the present invention accelerates nanometer is again carried out according to the following steps:
One, according to the welding CCT diagram of nanometer bainitic steel to be welded, corresponding austenite transformation temperature Ac is determined 1, martensite transformation temperature Ms;
Two, according to welding condition, measure the field of welding temperature that nanometer bainitic steel to be welded is corresponding, determine the austenite transformation temperature Ac that peak temperature point O and rear, molten bath are determined along step one on axis of a weld direction under this field of welding temperature quasi stationary temperature field 1between distance L 0, the austenite transformation temperature Ac that determines of peak temperature point O and molten bath rear vertical step one on axis of a weld direction 1between distance L 1, peak temperature point O and rear, molten bath be along Ms+50 DEG C of isothermal distance L on axis of a weld direction 2with peak temperature point O and rear, molten bath along Ms+300 DEG C of isothermal distance L on axis of a weld direction 3;
Three, determine that the radius with the impact head on weldering impact rotating extrusion device is L 1;
Four, adjust with the distance OO ' of the impact head on weldering impact rotating extrusion device to peak temperature point O in step 2, O ' is in along impacting the rear of the impact head moving direction on rotating extrusion device with weldering and making OO ' at L 0+ L 1and L 2-L 1between, adjust nanometer bainitic steel to be welded and with the distance of welding the impact head impacted on rotating extrusion device, make nanometer bainitic steel to be welded and equal 5mm ~ 15mm with the distance of welding the impact head impacted on rotating extrusion device;
Five, the distance OO of flame kernel to peak temperature point O in step 2 of torch is heated in adjustment ", make O " be in along impacting the rear of the impact head moving direction on rotating extrusion device with weldering and making OO " be in L 3and L 2between, controlling heating torch heating maximum temperature is 700 ~ 1100 DEG C;
Six, make workpiece movable, start welding, after welding starts, when workpiece movable is to when impacting below the impact head on rotating extrusion device with weldering, start and impact rotating extrusion device with weldering, time below workpiece movable to heating torch, start heating torch, start flame heating, when workpiece is passed by after with the impact head on weldering impact rotating extrusion device, quit work, after heating torch passed by by workpiece with weldering impact extruded device, heating torch quits work, and completes Static Recrystallization;
Seven, the mean grain size d of the austenite crystal of nanometer bainitic steel after Static Recrystallization is measured dRX;
Eight, the workpiece after step 6 is carried out nanometer again, nanometer welder is again incubated, and control nanometer temperature again and be in bainite transformation temperature interval, controlling nanometer temperature retention time is again t=t 0× (d dRX/ d 0), then air cooling is to room temperature, completes nanometer bainitic steel Austenite Grain Refinement and accelerates nanometer again; Wherein d 0for the austenite average crystal grain size of nanometer bainitic steel mother metal, t 0for the common welding process of nanometer again required time.
Beneficial effect of the present invention:
The phase transition process of the process of nanometer to be Cooling Austenite Transformation be bainite again, austenite crystal is more tiny, and transformation time is shorter, and transformation time is directly proportional to austenite grain size.Under the heat effect of welding arc, weld metal experience heating and cooling two processes, in cooling procedure, weld metal is still being in higher temperature from a distance, center, molten bath, impact rotating extrusion device to make the metal yield intensity in this region when the weld seam of use and quench zone metal have a high temperature and reduce, plastic deformation ability is better.Impact rotating extrusion device with weldering and act on this region, and make weld seam and quench zone metal that large plastic deformation occur, then just can make this region grain refinement by Static Recrystallization.Because the metal temperature after overbump rotary squeezing declines fast, in order to make the austenite generation recrystallization of distortion, after impact rotary squeezing head, certain distance flame heats, when the maximum temperature of flame heating reaches 700 ~ 1100 DEG C, just more tiny austenite crystal can be obtained.After such one section of Static Recrystallization process, austenite crystal obtains refinement, reduces the time of nanometer again.The effect of Static Recrystallization crystal grain thinning is relevant with deformation temperature with metal strain speed, strain rate is larger, deformation temperature is lower, Austenite Grain Refinement effect is better, wherein impacts rotary squeezing power and determines strain rate, impacts the workpiece temperature decision deformation temperature that rotary squeezing head makes use.
Adopt welding method of the present invention to achieve the high-quality welding of nanometer bainitic steel, considerably reduce again the time of method for making Nano, make again nanometer time decreased to the d of the original time dRX/ d 0, decrease the operation that nanometer technique again needs to be incubated in stove, improve production efficiency, reduce production cost; And make high-temperature region metal generation plastic deformation through overbump rotary squeezing, further obviate the weld defect such as pore, shrinkage cavity, improve the quality of welding point.
Accompanying drawing explanation
Fig. 1 is the welding temperature field pattern of nanometer bainitic steel to be welded in test one; Wherein A is Ac 1thermoisopleth, B is Ms thermoisopleth, and C is Ms+300 DEG C of thermoisopleth, and D is Ms+50 DEG C of thermoisopleth.
Detailed description of the invention
Detailed description of the invention one: the method that the nanometer bainitic steel Austenite Grain Refinement of present embodiment accelerates nanometer is again carried out according to the following steps:
One, according to the welding CCT diagram of nanometer bainitic steel to be welded, corresponding austenite transformation temperature Ac is determined 1, martensite transformation temperature Ms;
Two, according to welding condition, measure the field of welding temperature that nanometer bainitic steel to be welded is corresponding, determine the austenite transformation temperature Ac that peak temperature point O and rear, molten bath are determined along step one on axis of a weld direction under this field of welding temperature quasi stationary temperature field 1between distance L 0, the austenite transformation temperature Ac that determines of peak temperature point O and molten bath rear vertical step one on axis of a weld direction 1between distance L 1, peak temperature point O and rear, molten bath be along Ms+50 DEG C of isothermal distance L on axis of a weld direction 2with peak temperature point O and rear, molten bath along Ms+300 DEG C of isothermal distance L on axis of a weld direction 3;
Three, determine that the radius with the impact head on weldering impact rotating extrusion device is L 1;
Four, adjust with the distance OO ' of the impact head on weldering impact rotating extrusion device to peak temperature point O in step 2, O ' is in along impacting the rear of the impact head moving direction on rotating extrusion device with weldering and making OO ' at L 0+ L 1and L 2-L 1between, adjust nanometer bainitic steel to be welded and with the distance of welding the impact head impacted on rotating extrusion device, make nanometer bainitic steel to be welded and equal 5mm ~ 15mm with the distance of welding the impact head impacted on rotating extrusion device;
Five, the distance OO of flame kernel to peak temperature point O in step 2 of torch is heated in adjustment ", make O " be in along impacting the rear of the impact head moving direction on rotating extrusion device with weldering and making OO " be in L 3and L 2between, controlling heating torch heating maximum temperature is 700 ~ 1100 DEG C;
Six, make workpiece movable, start welding, after welding starts, when workpiece movable is to when impacting below the impact head on rotating extrusion device with weldering, start and impact rotating extrusion device with weldering, time below workpiece movable to heating torch, start heating torch, start flame heating, when workpiece is passed by after with the impact head on weldering impact rotating extrusion device, quit work, after heating torch passed by by workpiece with weldering impact extruded device, heating torch quits work, and completes Static Recrystallization;
Seven, the mean grain size d of the austenite crystal of nanometer bainitic steel after Static Recrystallization is measured dRX;
Eight, the workpiece after step 6 is carried out nanometer again, nanometer welder is again incubated, and control nanometer temperature again and be in bainite transformation temperature interval, controlling nanometer temperature retention time is again t=t 0× (d dRX/ d 0), then air cooling is to room temperature, completes nanometer bainitic steel Austenite Grain Refinement and accelerates nanometer again; Wherein d 0for the austenite average crystal grain size of nanometer bainitic steel mother metal, t 0for the common welding process of nanometer again required time.
The impact head impacted on rotating extrusion device with weldering described in present embodiment step 3 is prior art, its for application number be 201210528226X, denomination of invention be " for impacting the impact head on rotating extrusion device with weldering ", application people to be Harbin Institute of Technology and the applying date be record in the Chinese invention patent on December 10th, 2012 with the upper impact head welding impact rotating extrusion device.
The welder of nanometer again described in present embodiment step 8 is prior art, its for application number be 2012100960577, denomination of invention is the welder of nanometer again of " welder of nanometer again of nanometer bainitic steel and method ", application people to be Harbin Institute of Technology and the applying date the be nanometer bainitic steel recorded in the Chinese invention patent on April 5th, 2012.
The phase transition process of the process of nanometer to be Cooling Austenite Transformation be bainite again, austenite crystal is more tiny, and transformation time is shorter, and transformation time is directly proportional to austenite grain size.Under the heat effect of welding arc, weld metal experience heating and cooling two processes, in cooling procedure, weld metal is still being in higher temperature from a distance, center, molten bath, impact rotating extrusion device to make the metal yield intensity in this region when the weld seam of use and quench zone metal have a high temperature and reduce, plastic deformation ability is better.Impact rotating extrusion device with weldering and act on this region, and make weld seam and quench zone metal that large plastic deformation occur, then just can make this region grain refinement by Static Recrystallization.Because the metal temperature after overbump rotary squeezing declines fast, in order to make the austenite generation recrystallization of distortion, after impact rotary squeezing head, certain distance flame heats, when the maximum temperature of flame heating reaches 700 ~ 1100 DEG C, just more tiny austenite crystal can be obtained.After such one section of Static Recrystallization process, austenite crystal obtains refinement, reduces the time of nanometer again.The effect of Static Recrystallization crystal grain thinning is relevant with deformation temperature with metal strain speed, strain rate is larger, deformation temperature is lower, Austenite Grain Refinement effect is better, wherein impacts rotary squeezing power and determines strain rate, impacts the workpiece temperature decision deformation temperature that rotary squeezing head makes use.
Adopt the welding method of present embodiment to achieve the high-quality welding of nanometer bainitic steel, considerably reduce again the time of method for making Nano, make again nanometer time decreased to the d of the original time dRX/ d 0, decrease the operation that nanometer technique again needs to be incubated in stove, improve production efficiency, reduce production cost; And make high-temperature region metal generation plastic deformation through overbump rotary squeezing, further obviate the weld defect such as pore, shrinkage cavity, improve the quality of welding point.
Detailed description of the invention two: present embodiment and detailed description of the invention one unlike: make nanometer bainitic steel to be welded in step 4 and equal 10mm with the distance of welding the impact head impacted on rotating extrusion device.Other step and parameter identical with detailed description of the invention one.
Detailed description of the invention three: present embodiment and detailed description of the invention one or two unlike: determining to heat torch in step 5, to heat maximum temperature be 900 ~ 1050 DEG C.Other step and parameter identical with detailed description of the invention one or two.
Detailed description of the invention four: one of present embodiment and detailed description of the invention one to three unlike: determine in step 5 heating torch heating maximum temperature be 950 ~ 1050 DEG C.Other step and parameter identical with one of detailed description of the invention one to three.
Detailed description of the invention five: one of present embodiment and detailed description of the invention one to four unlike: determine in step 5 heating torch heating maximum temperature be 1000 DEG C.Other step and parameter identical with one of detailed description of the invention one to four.
With following verification experimental verification beneficial effect of the present invention:
The method that nanometer is accelerated in test one, the nanometer bainitic steel Austenite Grain Refinement of this test is again carried out according to the following steps:
This tests the primary alloy constituent of nanometer bainitic steel used and content (mass fraction meter) is: the C of 0.87%, the Si of 1.16%, the Mn of 1.54%, the Ni of 0.49%, the Al of 1.13%, the Mo of 0.28%.
The method that Austenite Grain Refinement accelerates nanometer is again as follows:
One, according to the welding CCT diagram of nanometer bainitic steel to be welded, corresponding austenite transformation temperature Ac is determined 1, martensite transformation temperature Ms;
Ac in this test 1temperature is 790 DEG C;
In this test, Ms temperature is 142 DEG C;
Two, according to welding condition, measure the field of welding temperature that nanometer bainitic steel to be welded is corresponding, determine the austenite transformation temperature Ac that peak temperature point O and rear, molten bath are determined along step one on axis of a weld direction under this field of welding temperature quasi stationary temperature field 1between distance L 0, the austenite transformation temperature Ac that determines of peak temperature point O and molten bath rear vertical step one on axis of a weld direction 1between distance L 1, peak temperature point O and rear, molten bath be along Ms+50 DEG C of isothermal distance L on axis of a weld direction 2with peak temperature point O and rear, molten bath along Ms+300 DEG C of isothermal distance L on axis of a weld direction 3;
L in this test 0=12mm, L 1=9mm, L 2=60mm, L 3=35mm.
Three, determine that the radius with the impact head on weldering impact rotating extrusion device is L 1;
The radius of the impact head impacted on rotating extrusion device with weldering in this test is 9mm.
The power of the impact head impacted on rotating extrusion device with weldering in this test is 500W;
Four, adjust with the distance OO ' of the impact head on weldering impact rotating extrusion device to peak temperature point O in step 2, O ' is in along impacting the rear of the impact head moving direction on rotating extrusion device with weldering and making OO ' at L 0+ L 1and L 2-L 1between, adjust nanometer bainitic steel to be welded and with the distance of welding the impact head impacted on rotating extrusion device, make nanometer bainitic steel to be welded and equal 10mm with the distance of welding the impact head impacted on rotating extrusion device;
OO ' in this experiment=25mm;
Five, the distance OO of flame kernel to peak temperature point O in step 2 of torch is heated in adjustment ", make O " be in along impacting the rear of the impact head moving direction on rotating extrusion device with weldering and making OO " be in L 3and L 2between, controlling heating torch heating maximum temperature is 950 ~ 1050 DEG C;
OO in this test "=40mm;
Six, make workpiece movable, start welding, after welding starts, when workpiece movable is to when impacting below the impact head on rotating extrusion device with weldering, start and impact rotating extrusion device with weldering, time below workpiece movable to heating torch, start heating torch, start flame heating, when workpiece is passed by after with the impact head on weldering impact rotating extrusion device, quit work, after heating torch passed by by workpiece with weldering impact extruded device, heating torch quits work, and completes Static Recrystallization;
Seven, the mean grain size d of the austenite crystal of nanometer bainitic steel after Static Recrystallization is measured dRX;
This test is at d dRX=20um;
Eight, the workpiece after step 6 is carried out nanometer again, nanometer welder is again incubated, and control nanometer temperature again and be in bainite transformation temperature interval, controlling nanometer temperature retention time is again t=t 0× (d dRX/ d 0), then air cooling is to room temperature, completes nanometer bainitic steel Austenite Grain Refinement and accelerates nanometer again; Wherein d 0for the austenite average crystal grain size of nanometer bainitic steel mother metal, t 0for the common welding process of nanometer again required time.
In this test, nanometer temperature is 250 DEG C again;
D in this test 0=50um;
T in this test 0=8h.
The impact head impacted on rotating extrusion device with weldering described in this test procedure three is prior art, its for application number be 201210528226X, denomination of invention be " for impacting the impact head on rotating extrusion device with weldering ", application people to be Harbin Institute of Technology and the applying date be record in the Chinese invention patent on December 10th, 2012 with the upper impact head welding impact rotating extrusion device.
The welder of nanometer again described in this test procedure seven is prior art, its for application number be 2012100960577, denomination of invention is the welder of nanometer again of " welder of nanometer again of nanometer bainitic steel and method ", application people to be Harbin Institute of Technology and the applying date the be nanometer bainitic steel recorded in the Chinese invention patent on April 5th, 2012.
The welding method of this test is adopted to achieve the high-quality welding of nanometer bainitic steel, considerably reduce again the time of method for making Nano, this test is than the time shorten 4.8h of original method for making Nano more as calculated, decrease the operation that nanometer technique again needs to be incubated in stove, improve production efficiency, reduce production cost; And make high-temperature region metal generation plastic deformation through overbump rotary squeezing, further obviate the weld defect such as pore, shrinkage cavity, improve the quality of welding point.

Claims (5)

1. nanometer bainitic steel Austenite Grain Refinement accelerates the method for nanometer again, it is characterized in that the method that nanometer bainitic steel Austenite Grain Refinement accelerates nanometer is again carried out according to the following steps:
One, according to the welding CCT diagram of nanometer bainitic steel to be welded, corresponding austenite transformation temperature Ac is determined 1, martensite transformation temperature Ms;
Two, according to welding condition, measure the field of welding temperature that nanometer bainitic steel to be welded is corresponding, determine the austenite transformation temperature Ac that peak temperature point O and rear, molten bath are determined along step one on axis of a weld direction under this field of welding temperature quasi stationary temperature field 1between distance L 0, the austenite transformation temperature Ac that determines of peak temperature point O and molten bath rear vertical step one on axis of a weld direction 1between distance L 1, peak temperature point O and rear, molten bath be along Ms+50 DEG C of isothermal distance L on axis of a weld direction 2with peak temperature point O and rear, molten bath along Ms+300 DEG C of isothermal distance L on axis of a weld direction 3;
Three, determine that the radius with the impact head on weldering impact rotating extrusion device is L 1;
Four, adjust with the distance OO ' of the impact head on weldering impact rotating extrusion device to peak temperature point O in step 2, O ' is in along impacting the rear of the impact head moving direction on rotating extrusion device with weldering and making OO ' at L 0+ L 1and L 2-L 1between, adjust nanometer bainitic steel to be welded and with the distance of welding the impact head impacted on rotating extrusion device, make nanometer bainitic steel to be welded and equal 5mm ~ 15mm with the distance of welding the impact head impacted on rotating extrusion device;
Five, the distance OO of flame kernel to peak temperature point O in step 2 of torch is heated in adjustment ", make O " be in along impacting the rear of the impact head moving direction on rotating extrusion device with weldering and making OO " be in L 3and L 2between, controlling heating torch heating maximum temperature is 700 ~ 1100 DEG C;
Six, make workpiece movable, start welding, after welding starts, when workpiece movable is to when impacting below the impact head on rotating extrusion device with weldering, start and impact rotating extrusion device with weldering, time below workpiece movable to heating torch, start heating torch, start flame heating, when workpiece is passed by after with the impact head on weldering impact rotating extrusion device, quit work, after heating torch passed by by workpiece with weldering impact extruded device, heating torch quits work, and completes Static Recrystallization;
Seven, the mean grain size d of the austenite crystal of nanometer bainitic steel after Static Recrystallization is measured dRX;
Eight, the workpiece after step 6 is carried out nanometer again, nanometer welder is again incubated, and control nanometer temperature again and be in bainite transformation temperature interval, controlling nanometer temperature retention time is again t=t 0× (d dRX/ d 0), then air cooling is to room temperature, completes nanometer bainitic steel Austenite Grain Refinement and accelerates nanometer again; Wherein d 0for the austenite average crystal grain size of nanometer bainitic steel mother metal, t 0for the common welding process of nanometer again required time.
2. nanometer bainitic steel Austenite Grain Refinement according to claim 1 accelerates the method for nanometer again, it is characterized in that making nanometer bainitic steel to be welded in step 4 and equaling 10mm with the distance of welding the impact head impacted on rotating extrusion device.
3. nanometer bainitic steel Austenite Grain Refinement according to claim 1 and 2 accelerates the method for nanometer again, it is characterized in that determining in step 5 that heating torch heating maximum temperature is 900 ~ 1050 DEG C.
4. nanometer bainitic steel Austenite Grain Refinement according to claim 3 accelerates the method for nanometer again, it is characterized in that determining in step 5 that heating torch heating maximum temperature is 950 ~ 1050 DEG C.
5. nanometer bainitic steel Austenite Grain Refinement according to claim 3 accelerates the method for nanometer again, it is characterized in that determining in step 5 that heating torch heating maximum temperature is 1000 DEG C.
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