CN106854746A - A kind of high ferro surface peening rare earth high-carbon chromium steel and its preparation technology - Google Patents
A kind of high ferro surface peening rare earth high-carbon chromium steel and its preparation technology Download PDFInfo
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- CN106854746A CN106854746A CN201611070454.1A CN201611070454A CN106854746A CN 106854746 A CN106854746 A CN 106854746A CN 201611070454 A CN201611070454 A CN 201611070454A CN 106854746 A CN106854746 A CN 106854746A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/40—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions
- C23C8/42—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using liquids, e.g. salt baths, liquid suspensions only one element being applied
- C23C8/44—Carburising
- C23C8/46—Carburising of ferrous surfaces
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
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Abstract
A kind of high ferro preparation technology of surface peening rare earth high-carbon chromium steel, including GCr15 steel parts are placed in containing in the closed salt bath furnace of the neutral fused salt of rare earth and aluminium powder, chemical reaction is produced by the carbon in the metallic atom in fused salt and steel part matrix, nitrogen-atoms, steel part matrix surface is diffused in and is formed the metallic carbide layer containing rare earth element.Rare earth element of the present invention is yttrium, neodymium, can be added with single-element, it is also possible to mixes two kinds and adds simultaneously, by the mass ratio of yttrium and neodymium is 1 two kinds of rare earth elements are added simultaneously when:1~1:4, introducing form is yttrium, the chloride of neodymium.The invention provides a kind of high ferro surface peening rare earth high-carbon chromium steel and its preparation technology, by adjust fused salt component, proportioning and preparation technology, realize the Proper Match of rare earth high-carbon chromium steel high intensity, high surface hardness and high tenacity.Overcome high ferro bearing steel alloy surface carbonation thickness degree of the prior art irregular, the technological deficiency such as combination property difference.
Description
Technical field
It is specifically a kind of for high-speed railway bearing the present invention relates to the surface strengthening treatment technology field of steel part
Rare earth high-carbon chromium steel and its salt bath expand cementation process.
Background technology
High ferro bearing as bullet train machine driven system one of crucial walking component, its performance, life-span and reliability
Property turn into vehicle stability, the restraining factors of security.As a example by organizing into groups quality for the CRH5 axle box bearings of 451t, with average
Value estimation, often covers bearing load and is about 68.7kN, and maximum rolling body load is about 7.6kN, and contact of the inner ring raceway with roller should
Power is about 810MPa.At present, the domestic steel grade for train bearing includes high-carbon-chromium bearing steel（GCr15、GCr15SiMn、
GCr15SiMo, GCr18Mo etc.）And carburizing bearing steel（G20CrNiMo, G20CrNi2Mo, G20Cr2Ni4 etc.）Two types.Its
In, carburizing bearing steel has hardness high, fatigue strength and wearability, while core can also have obdurability high, uses extensively
In manufacture railway bearing lasso.However, the price of carburizing steel is costly, and heat treatment cost is higher than high-carbon-chromium bearing steel by 2 ~ 4
Times, carburization step tail gas contains the CO of a large amount of adverse conditions2And CO.Therefore, need badly a kind of cost rationally and hardness, wearability and
Impact flexibility excellent new steel substitute carburizing steel.
At present, salt bath infiltration method is a kind of process for treating surface applied widely.Can after salt bath infiltration is processed
Preferably to improve matrix strength, hardness, wear-resisting and decay resistance, and salt bath penetrates into the cenotype to be formed and is combined tightly with matrix
Close, adhesive force is strong, can bear larger load without peeling off, destroying.As Chinese patent CN1072733A discloses a kind of rare earth
Urge and ooze glow discharge nitriding new technology, proposition using the mischmetal of La and Ce urge the thinking of nitriding, but energizer is present matches somebody with somebody
The problems such as side is complicated, active relatively low.A kind of high-carbon steel pin roll vanadizing Combined Processing work disclosed in Chinese patent CN101033554A
Skill, using solid powder method vanadinizing, 950 ~ 990 DEG C of vanadinizing temperature, the time is 6 ~ 8 hours.Salt bath equipment operation is simple and practical, plus
It is hot uniform, can direct quenching treatment after oozing.But carbon layers having thicknesses are irregular and quality is whard to control, inefficiency.
The content of the invention
In order to overcome high ferro bearing steel alloy surface carbonation thickness degree of the prior art irregular, the skill such as combination property difference
Art defect, the invention provides a kind of high ferro surface peening rare earth high-carbon chromium steel and its preparation technology, by adjusting fused salt
Component, proportioning and preparation technology, realize the Proper Match of rare earth high-carbon chromium steel high intensity, high surface hardness and high tenacity.
In order to solve the above technical problems, the technical solution adopted in the present invention is：A kind of high ferro is high with surface peening rare earth
Carbon chromium steel, the matrix of the rare earth high-carbon chromium steel is GCr15 steel parts, and a thickness is formed with the outer surface salt bath infiltration treatment of matrix
The metallic carbide layer for 6~11 μm is spent, metallic carbide layer includes the component of following mass percent：0.01%~0.12%
Al, 0.27%~0.35% rare earth element, 0.002%~0.035% Ba, 1.21%~1.32% Cr, 0.12%~0.28%
Si, 0.27%~0.38% Mn, 0.97%~1.03% C, described rare earth element are one or two in yttrium and neodymium.
When described rare earth element is two kinds, the mass ratio of yttrium and neodymium is 1:1~1:4.
A kind of high ferro preparation technology of surface peening rare earth high-carbon chromium steel, comprises the following steps：
（1）, substrate pretreated：Cleaned during GCr15 steel parts are put into methyl alcohol or gasoline, afterwards to the GCr15 steel after cleaning
Part carries out surface polishing, obtains pretreated matrix, standby；
（2）, prepare fused salt：According to mass percent, 1% ~ 5% Al powder, 6% ~ 9% NaF, 3.6% ~ 9.75% is weighed respectively
The BaCl of NaCl and 31.5% ~ 70.2%2It is placed in salt bath furnace, after being sufficiently mixed, is heated to 810 ~ 850 DEG C and is dissolved, afterwards,
It is 15% ~ 50% rare earth-iron-boron to mass percent is added in salt bath furnace, after stirring, enters under the conditions of 810 ~ 850 DEG C
Row 2 ~ 3h of heating, obtains fused salt, standby；
Described rare earth-iron-boron is YCl3And NdCl3In at least one；
（3）, chemical infiltration：Rate-determining steps（2）Obtained temperature of molten salt is 850 ~ 900 DEG C, by step（1）Pretreated matrix
After being preheated through 650 ~ 680 DEG C, imbed in the fused salt, carry out 2 ~ 5h of heating, afterwards, control temperature of molten salt is warming up to 950 ~ 1030
DEG C, and 3 ~ 6h of insulation is carried out at such a temperature；
（4）, quench, be tempered：By step（3）Taken out by the steel part after chemical infiltration, carried out in 410 ~ 430 DEG C of thermostat of quenching
0.5 ~ 1h of insulation, afterwards, 1 ~ 2h of isothermal spheroidizing is carried out by the steel part transposition in thermostat at a temperature of 785 ~ 805 DEG C, is moved back
It is air cooled to room temperature after fire, then transposition carries out 3 ~ 4 step pulse formula circulating quenching-tempering under the conditions of 840 ~ 860 DEG C, insulation 5 ~
10min, afterwards, is cleaned using 100 DEG C of industrial water to steel piece surface, then, is carried out under the conditions of being placed in 150 ~ 160 DEG C
Tempering 1 ~ 2h of isothermal holding, afterwards, is cleaned again using 100 DEG C of cleaning fluid to steel piece surface, that is, obtain finished product high ferro
With surface peening rare earth high-carbon chromium steel.
In step（2）In, salt bath furnace used is filled to be configured with automatic stirring in closed salt bath furnace, and the salt bath furnace
Put.
In step（4）In, cleaning solution used is NaNO that mass concentration is 5%2Solution.
In step（4）In, it is described quench, temper is double process for refining.
In step（4）In, it is described quench, temper uses step pulse circulating-heating mode.
Beneficial effects of the present invention：
（1）, surface peening rare earth high-carbon chromium steel prepared by the present invention, by the adjustment of the component of fused salt and proportioning, Yi Jikuo
The control of numerous parameters in cementation process, in enabling the metallic atoms and GCr15 steel part matrixes such as yttrium, neodymium, aluminium, barium in fused salt
Carbon, nitrogen-atoms produce chemical reaction, and and then be diffused in steel part matrix surface formed containing yttrium, neodymium metallic carbide layer.Yttrium, neodymium
Being added in molten salt bath for rare earth element can play activating catalysis and infiltration effect, and can be effectively improved the tissue and property of workpiece surface
Energy.In preparation technology, the use of closed salt bath furnace effectively reduces the volatilization of molten salt composition；Using the automatic stirring of salt bath furnace
Device, also reduces the segregation of salt bath；The hydronic mode of step pulse is used in oil quenching step, salt bath energy is effectively reduced
Consumption, it is ensured that the carbon in metallic atom and steel part matrix in fused salt, nitrogen-atoms can sufficiently be chemically reacted, Jin Erkuo
It is seeped into matrix；Steel part heat treatment after salt bath uses double-fined treatment technique, will steel part quench isothermal treatment for short time in thermostat
Afterwards, short time isothermal spheroidizing is carried out, then by multiple step pulse circulating quenching-tempering, carbide and crystalline substance can be reached
Double thinning effects of grain.After yttrium, neodymium atom penetrate into workpiece surface formation infiltration layer, surface peening effect is served, change infiltration layer
Institutional framework has simultaneously refined tissue, effectively increases case depth, improves wearability, microhardness and corrosion resistance etc..
Realize the Proper Match of rare earth high-carbon chromium steel high intensity, high surface hardness and high tenacity.
（2）, the present invention prepared by surface peening rare earth high-carbon chromium steel, by works such as molten salt bath, grade quench, tempering
Skill is operated, and makes the alloying layer thickness of finished surface reinforced rare earth high-carbon chromium steel not less than 6 μm, and thickness is uniform, good combination property, warp
Determine, the infiltration layer room temperature surface hardness is not less than 59.8HRC, tensile strength is not less than 15J/ not less than 1116MPa, impact flexibility
cm2, can preferably meet the requirement of bearing steel part performance used for high-speed railway.
Brief description of the drawings
Fig. 1 is process chart of the GCr15 steel parts quenching, during temper.
Specific embodiment
Following embodiments are only described in further detail to the present invention, but do not constitute any limitation of the invention.
A kind of high ferro preparation technology of surface peening rare earth high-carbon chromium steel, including GCr15 steel parts are placed in containing rare earth and
In the closed salt bath furnace of neutral fused salt of aluminium powder, produced by the carbon in the metallic atom in fused salt and steel part matrix, nitrogen-atoms
Chemical reaction, is diffused in steel part matrix surface and forms the metallic carbide layer containing rare earth element.Rare earth element of the present invention
It is yttrium, neodymium, can be added with single-element, it is also possible to mix two kinds and add simultaneously, two kinds of rare earth elements presses yttrium when adding simultaneously
It is 1 with the mass ratio of neodymium:1~1:4, introducing form is yttrium, the chloride of neodymium.
A kind of salt bath process for preparing rare earth high-carbon chromium steel of the present invention, the technique comprises the following steps：
（1）, substrate pretreated：Cleaned during GCr15 steel parts are put into methyl alcohol or gasoline, afterwards to the GCr15 steel after cleaning
Part carries out surface polishing, obtains pretreated matrix, standby；
（2）, prepare fused salt：According to mass percent, 1% ~ 5% Al powder, 6% ~ 9% NaF, 3.6% ~ 9.75% is weighed respectively
The BaCl of NaCl and 31.5% ~ 70.2%2It is placed in salt bath furnace, after being sufficiently mixed, is heated to 810 ~ 850 DEG C and is dissolved, afterwards,
It is 15% ~ 50% rare earth-iron-boron to mass percent is added in salt bath furnace, after stirring, enters under the conditions of 810 ~ 850 DEG C
Row 2 ~ 3h of heating, obtains fused salt, standby；
Described rare earth-iron-boron is YCl3And NdCl3In at least one；
（3）, chemical infiltration：Rate-determining steps（2）Obtained temperature of molten salt is 850 ~ 900 DEG C, by step（1）Pretreated matrix
After being preheated through 650 ~ 680 DEG C, imbed in the fused salt, carry out 2 ~ 5h of heating, afterwards, control temperature of molten salt is warming up to 950 ~ 1030
DEG C, and 3 ~ 6h of insulation is carried out at such a temperature；
（4）, quench, be tempered：By step（3）Taken out by the steel part after chemical infiltration, carried out in 410 ~ 430 DEG C of thermostat of quenching
0.5 ~ 1h of insulation；Taken out from thermostat, 1 ~ 2h of isothermal spheroidizing is carried out at a temperature of being placed in 785 ~ 805 DEG C, be air cooled to room temperature；Again
Transposition carries out 3 ~ 4 step pulse circulating quenching-tempering under the conditions of 840 ~ 860 DEG C, is incubated 5 ~ 10min, and using 100 DEG C
Industrial water is cleaned to steel piece surface；Finally, carry out being tempered 1 ~ 2h of isothermal holding under the conditions of being placed in 150 ~ 160 DEG C, use
100 DEG C of cleaning fluid is cleaned again to steel piece surface, that is, obtain finished product high ferro surface peening rare earth high-carbon chromium steel.
In step（2）In, salt bath furnace used is filled to be configured with automatic stirring in closed salt bath furnace, and the salt bath furnace
Put.
In step（4）In, cleaning solution used is NaNO that mass concentration is 5%2Solution.
In step（4）In, it is described quench, temper is double process for refining.
In step（4）In, it is described quench, temper uses step pulse circulating-heating mode.
Embodiment 1
A kind of surface peening rare earth high-carbon chromium steel described in the present embodiment, by molten salt bath, penetrates on GCr15 steel matrix surface
Yttrium, neodymium metal, form the metal carbon-coating containing yttrium neodymium.Its salt bath process is：
（1）Substrate pretreated：GCr15 steel parts are put into methyl alcohol and are cleaned, table is carried out to the GCr15 steel parts after cleaning afterwards
Mirror polish, obtains pretreated matrix, standby；
（2）Prepare fused salt：Molten salt composition proportioning is Al-BaCl2-NaCl-NaF-YCl3-NdCl3, wherein, the mass fraction of Al powder
The mass fraction for being 3%, NaF is that the mass fraction of 7%, NaCl is 6.875%, BaCl2Mass fraction be 48.125%, treat 830
After DEG C fused salt dissolves, then it is separately added into the YCl that mass fraction is 15%3With the NdCl that mass fraction is 20%3, 3h is incubated, melted
Salt, it is standby；
（3）Chemical infiltration：By step（1）Pretreated GCr15 steel part matrixes, after being preheated through 650 DEG C, feeding contains step
（2）Fused salt salt bath furnace in, charging temperature be 850 DEG C, be incubated 2h；The salt temperature of heating and thermal insulation treatment is 950 DEG C, insulation
Time is 3h；
（4）Quench, be tempered：After salt bath terminates, taking-up steel part is quenched in 420 DEG C of thermostats, is incubated 30min；Then in 790 DEG C of isothermals
Spheroidizing, is incubated 90min, air cooling；4 step pulse circulations are carried out in 860 DEG C, 855 DEG C, 850 DEG C, 845 DEG C to quench-be tempered,
Insulation 6min, oil quenching；Cleaned with 100 DEG C of industrial waters, through 150 DEG C of tempering, 120min is incubated, using 100 DEG C of mass concentration
It is 5% NaNO2Solution is cleaned again to steel piece surface, that is, the finished product high ferro surface peening rare earth high-carbon chromium steel for obtaining.
After measured：The alloying layer thickness of finished product high ferro surface peening rare earth high-carbon chromium steel is 6 μm, and tensile strength reaches
1116MPa, room temperature surface hardness reach 59.8HRC, impact flexibility for 15 J/cm2。
Embodiment 2
A kind of surface peening rare earth high-carbon chromium steel described in the present embodiment, by molten salt bath, penetrates on GCr15 steel matrix surface
Yttrium, neodymium metal, form the metal carbon-coating containing yttrium neodymium.Its salt bath process is：
（1）Substrate pretreated：GCr15 steel parts are put into gasoline and are cleaned, table is carried out to the GCr15 steel parts after cleaning afterwards
Mirror polish, obtains pretreated matrix, standby；
（2）Prepare fused salt：Molten salt composition proportioning is Al-BaCl2-NaCl-NaF-YCl3-NdCl3, wherein, the mass fraction of Al powder
The mass fraction for being 4%, NaF is that the mass fraction of 8%, NaCl is 5.34%, BaCl2Mass fraction be 42.66%, treat 830 DEG C
After fused salt dissolves, then it is separately added into the YCl that mass fraction is 17.5%3With the NdCl that mass fraction is 22.5%3, 2h is incubated, obtain
Fused salt, it is standby；
（3）Chemical infiltration：By step（1）Pretreated GCr15 steel part matrixes, through 660 DEG C of preheatings, feeding contains step（2）
Fused salt salt bath furnace in, charging temperature be 860 DEG C, be incubated 3h；The salt temperature of heating and thermal insulation treatment is 960 DEG C, during insulation
Between be 4h；
（4）Quench, be tempered：After salt bath terminates, taking-up steel part is quenched in 420 DEG C of thermostats, is incubated 40min；Then in 795 DEG C of isothermals
Spheroidizing, is incubated 100min, air cooling；4 step pulse circulations are carried out in 860 DEG C, 855 DEG C, 850 DEG C, 845 DEG C to quench-be tempered,
Insulation 7min, oil quenching；Cleaned with 100 DEG C of industrial waters, through 155 DEG C of tempering, 110min is incubated, using 100 DEG C of mass concentration
It is 5% NaNO2Solution is cleaned again to steel piece surface, that is, the finished product high ferro surface peening rare earth high-carbon chromium steel for obtaining；
After measured：The alloying layer thickness of finished product high ferro surface peening rare earth high-carbon chromium steel be 7 μm, tensile strength reach 1190MPa,
Room temperature surface hardness reaches 60.3HRC, impact flexibility for 18 J/cm2。
Embodiment 3
A kind of surface peening rare earth high-carbon chromium steel described in the present embodiment, by molten salt bath, penetrates on GCr15 steel matrix surface
Yttrium, neodymium metal, form the metal carbon-coating containing yttrium neodymium.Its salt bath process is：
（1）Substrate pretreated：GCr15 steel parts are put into gasoline and are cleaned, table is carried out to the GCr15 steel parts after cleaning afterwards
Mirror polish, obtains pretreated matrix, standby；
（2）Prepare fused salt：Molten salt composition proportioning is Al-BaCl2-NaCl-NaF-YCl3-NdCl3, wherein, the mass fraction of Al powder
The mass fraction for being 5%, NaF is that the mass fraction of 9%, NaCl is 4.1%, BaCl2Mass fraction be 36.9%, treat 830 DEG C melt
After salt dissolves, then it is separately added into the YCl that mass fraction is 7.5%3With the NdCl that mass fraction is 37.5%3, 3h is incubated, melted
Salt, it is standby；
（3）Chemical infiltration：By step（1）Pretreated GCr15 steel part matrixes, through 670 DEG C of preheatings, feeding contains step（2）
Fused salt salt bath furnace in, charging temperature be 870 DEG C, be incubated 4h；The salt temperature of heating and thermal insulation treatment is 970 DEG C, during insulation
Between be 5h；
（4）Quench, be tempered：After salt bath terminates, taking-up steel part is quenched in 430 DEG C of thermostats, is incubated 50min；Then in 800 DEG C of isothermals
Spheroidizing, is incubated 110min, air cooling；3 step pulse circulations are carried out in 860 DEG C, 850 DEG C, 840 DEG C to quench-be tempered, be incubated
8min, oil quenching；Cleaned with 100 DEG C of industrial waters, through 160 DEG C of tempering, be incubated 100min, the mass concentration for using 100 DEG C is 5%
NaNO2Solution is cleaned again to steel piece surface, that is, the finished product high ferro surface peening rare earth high-carbon chromium steel for obtaining；
After measured：The alloying layer thickness of finished product high ferro surface peening rare earth high-carbon chromium steel be 9 μm, tensile strength reach 1185MPa,
Room temperature surface hardness reaches 60.1HRC, impact flexibility for 17J/cm2。
Embodiment 4
A kind of surface peening rare earth high-carbon chromium steel described in the present embodiment, by molten salt bath, penetrates on GCr15 steel matrix surface
Yttrium, neodymium metal, form the metal carbon-coating containing yttrium neodymium.Its salt bath process is：
（1）Substrate pretreated：GCr15 steel parts are put into methyl alcohol and are cleaned, table is carried out to the GCr15 steel parts after cleaning afterwards
Mirror polish, obtains pretreated matrix, standby；
（2）Prepare fused salt：Molten salt composition proportioning is Al-BaCl2-NaCl-NaF-YCl3-NdCl3, wherein, the mass fraction of Al powder
The mass fraction for being 5%, NaF is that the mass fraction of 9%, NaCl is 3.6%, BaCl2Mass fraction be 32.4%, treat 850 DEG C melt
After salt dissolves, then it is separately added into the YCl that mass fraction is 20%3With the NdCl that mass fraction is 30%3, 2h is incubated, fused salt is obtained,
It is standby；
（3）Chemical infiltration：By step（1）Pretreated GCr15 steel part matrixes, through 680 DEG C of preheatings, feeding contains step（2）
Fused salt salt bath furnace in, charging temperature be 880 DEG C, be incubated 5h, heating and thermal insulation treatment salt temperature be 980 DEG C, during insulation
Between be 6h；
（4）Quench, be tempered：After salt bath terminates, taking-up steel part is quenched in 430 DEG C of thermostats, is incubated 60min；Then in 805 DEG C of isothermals
Spheroidizing, is incubated 120min, air cooling；3 step pulse circulations are carried out in 860 DEG C, 850 DEG C, 840 DEG C to quench-be tempered, be incubated
9min, oil quenching；Cleaned with 100 DEG C of industrial waters, through 160 DEG C of tempering, be incubated 100min, the mass concentration for using 100 DEG C is 5%
NaNO2Solution is cleaned again to steel piece surface, that is, the finished product high ferro surface peening rare earth high-carbon chromium steel for obtaining.
After measured：The alloying layer thickness of finished product high ferro surface peening rare earth high-carbon chromium steel is 11 μm, and tensile strength reaches
1258MPa, room temperature surface hardness reach 62.4HRC, impact flexibility for 24J/cm2。
Embodiment 5
A kind of surface peening rare earth high-carbon chromium steel described in the present embodiment, by molten salt bath, penetrates on GCr15 steel matrix surface
Yttrium, neodymium metal, form the metal carbon-coating containing yttrium neodymium.Its salt bath process is：
（1）Substrate pretreated：GCr15 steel parts are put into methyl alcohol and are cleaned, table is carried out to the GCr15 steel parts after cleaning afterwards
Mirror polish, obtains pretreated matrix, standby；
（2）Prepare fused salt：Molten salt composition proportioning is Al-BaCl2-NaCl-NaF-YCl3, wherein, the mass fraction of Al powder is 1%,
The mass fraction of NaF is 9.75%, BaCl for the mass fraction of 8%, NaCl2Mass fraction be 66.25%, treat that 810 DEG C of fused salts are molten
After change, the YCl that mass fraction is 15% is added3, 2.5h is incubated, fused salt is obtained, it is standby；
（3）Chemical infiltration：By step（1）Pretreated GCr15 steel part matrixes, through 670 DEG C of preheatings, feeding contains step（2）
Fused salt salt bath furnace in, charging temperature be 900 DEG C, be incubated 4h, heating and thermal insulation treatment salt temperature be 1000 DEG C, during insulation
Between be 5h；
（4）Quench, be tempered：After salt bath terminates, taking-up steel part is quenched in 410 DEG C of thermostats, is incubated 60min；Then in 785 DEG C of isothermals
Spheroidizing, is incubated 60min, air cooling；3 step pulse circulations are carried out in 860 DEG C, 850 DEG C, 840 DEG C to quench-be tempered, be incubated
10min, oil quenching；Cleaned with 100 DEG C of industrial waters, through 155 DEG C of tempering, be incubated 90min, the mass concentration for using 100 DEG C is 5%
NaNO2Solution is cleaned again to steel piece surface, that is, the finished product high ferro surface peening rare earth high-carbon chromium steel for obtaining.
After measured：The alloying layer thickness of finished product high ferro surface peening rare earth high-carbon chromium steel is 7 μm, and tensile strength reaches
1102MPa, room temperature surface hardness reach 59.8HRC, impact flexibility for 14J/cm2。
Embodiment 6
A kind of surface peening rare earth high-carbon chromium steel described in the present embodiment, by molten salt bath, penetrates on GCr15 steel matrix surface
Yttrium, neodymium metal, form the metal carbon-coating containing yttrium neodymium.Its salt bath process is：
（1）Substrate pretreated：GCr15 steel parts are put into gasoline and are cleaned, table is carried out to the GCr15 steel parts after cleaning afterwards
Mirror polish, obtains pretreated matrix, standby；
（2）Prepare fused salt：Molten salt composition proportioning is Al-BaCl2-NaCl-NaF-NdCl3, wherein, the mass fraction of Al powder is
The mass fraction of 4%, NaF is 7.5%, BaCl for the mass fraction of 6%, NaCl2Mass fraction be 52.5%, treat 840 DEG C of fused salts
After dissolving, the NdCl that mass fraction is 30% is added3, 2h is incubated, fused salt is obtained, it is standby；
（3）Chemical infiltration：By step（1）Pretreated GCr15 steel part matrixes, through 660 DEG C of preheatings, feeding contains step（2）
Fused salt salt bath furnace in, charging temperature be 880 DEG C, be incubated 4h, heating and thermal insulation treatment salt temperature be 1030 DEG C, during insulation
Between be 5h；
（4）Quench, be tempered：After salt bath terminates, taking-up steel part is quenched in 420 DEG C of thermostats, is incubated 50min；Then in 790 DEG C of isothermals
Spheroidizing, is incubated 100min, air cooling；3 step pulse circulations are carried out in 860 DEG C, 850 DEG C, 840 DEG C to quench-be tempered, be incubated
5min, oil quenching；Cleaned with 100 DEG C of industrial waters, through 160 DEG C of tempering, be incubated 60min, the mass concentration for using 100 DEG C is 5%
NaNO2Solution is cleaned again to steel piece surface, that is, the finished product high ferro surface peening rare earth high-carbon chromium steel for obtaining.
After measured：The alloying layer thickness of finished product high ferro surface peening rare earth high-carbon chromium steel is 9 μm, and tensile strength reaches
1196MPa, room temperature surface hardness reach 61.2HRC, impact flexibility for 20J/cm2。
The property of the GCr15 steel of surface peening rare earth high-carbon chromium steel and non-salt bath infiltration prepared by each embodiment of the invention
Energy index contrast, is shown in Table shown in one.
The main performance index of the invention steel of table one and compared steel
Claims (5)
1. a kind of high ferro surface peening rare earth high-carbon chromium steel, the matrix of the rare earth high-carbon chromium steel is GCr15 steel parts, and its feature exists
In：The metallic carbide layer that a layer thickness is 6~11 μm, metallic carbide layer are formed with the outer surface salt bath infiltration treatment of matrix
Component including following mass percent：0.01%~0.12% Al, 0.27%~0.35% rare earth element, 0.002%~
0.035% Ba's, 1.21%~1.32% Cr, 0.12%~0.28% Si, 0.27%~0.38% Mn, 0.97%~1.03%
C, described rare earth element is one or two in yttrium and neodymium.
2. a kind of high ferro according to claim 1 surface peening rare earth high-carbon chromium steel, it is characterised in that：Described rare earth
When element is two kinds, the mass ratio of yttrium and neodymium is 1:1~1:4.
3. a kind of high ferro according to claim 1 and 2 preparation technology of surface peening rare earth high-carbon chromium steel, its feature exists
In comprising the following steps：
（1）, substrate pretreated：Cleaned during GCr15 steel parts are put into methyl alcohol or gasoline, afterwards to the GCr15 steel after cleaning
Part carries out surface polishing, obtains pretreated matrix, standby；
（2）, prepare fused salt：According to mass percent, 1% ~ 5% Al powder, 6% ~ 9% NaF, 3.6% ~ 9.75% is weighed respectively
The BaCl of NaCl and 31.5% ~ 70.2%2It is placed in salt bath furnace, after being sufficiently mixed, is heated to 810 ~ 850 DEG C and is dissolved, afterwards,
It is 15% ~ 50% rare earth-iron-boron to mass percent is added in salt bath furnace, after stirring, enters under the conditions of 810 ~ 850 DEG C
Row 2 ~ 3h of heating, obtains fused salt, standby；
Described rare earth-iron-boron is YCl3And NdCl3In at least one；
（3）, chemical infiltration：Rate-determining steps（2）Obtained temperature of molten salt is 850 ~ 900 DEG C, by step（1）Pretreated matrix
After being preheated through 650 ~ 680 DEG C, imbed in the fused salt, carry out 2 ~ 5h of heating, afterwards, control temperature of molten salt is warming up to 950 ~ 1030
DEG C, and 3 ~ 6h of insulation is carried out at such a temperature；
（4）, quench, be tempered：By step（3）Taken out by the steel part after chemical infiltration, carried out in 410 ~ 430 DEG C of thermostat of quenching
0.5 ~ 1h of insulation, afterwards, 1 ~ 2h of isothermal spheroidizing is carried out by the steel part transposition in thermostat at a temperature of 785 ~ 805 DEG C, is moved back
It is air cooled to room temperature after fire, then transposition carries out 3 ~ 4 step pulse formula circulating quenching-tempering under the conditions of 840 ~ 860 DEG C, insulation 5 ~
10min, afterwards, is cleaned using 100 DEG C of industrial water to steel piece surface, then, is carried out under the conditions of being placed in 150 ~ 160 DEG C
Tempering 1 ~ 2h of isothermal holding, afterwards, is cleaned again using 100 DEG C of cleaning fluid to steel piece surface, that is, obtain finished product high ferro
With surface peening rare earth high-carbon chromium steel.
4. a kind of high ferro according to claim 3 preparation technology of surface peening rare earth high-carbon chromium steel, it is characterised in that：
In step（2）In, salt bath furnace used is to be configured with self- poking arrangement in closed salt bath furnace, and the salt bath furnace.
5. a kind of high ferro according to claim 3 preparation technology of surface peening rare earth high-carbon chromium steel, it is characterised in that：
In step（4）In, cleaning solution used is NaNO that mass concentration is 5%2Solution.
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