CN108570614A - A kind of molybdenum element segregation toughening high hardness alloy and its casting method - Google Patents

A kind of molybdenum element segregation toughening high hardness alloy and its casting method Download PDF

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CN108570614A
CN108570614A CN201810588898.7A CN201810588898A CN108570614A CN 108570614 A CN108570614 A CN 108570614A CN 201810588898 A CN201810588898 A CN 201810588898A CN 108570614 A CN108570614 A CN 108570614A
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iron
ferro
casting
alloy
temperature
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罗丰华
罗飞
周浩钧
曹军
黄明初
王哲
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Central South University
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Central South University
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Priority to CN201910431573.2A priority patent/CN110029284A/en
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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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/002—Heat treatment of ferrous alloys containing Cr
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron

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Abstract

The mass content of a kind of molybdenum element segregation toughening high hardness alloy and its casting method, alloy each element is Cr：9.0~13.0, B：2.6~2.9, C：0.7~0.9, Mo：1.8~3.0%, Nb：0.4~0.8, V：Content of the content of 0.4~0.8, Mn less than 0.3, Si is less than 0.07, surplus Fe；Wherein C and B：3.3~3.6；C/Cr content ratios：0.06~0.08；Nb and V：0.5~1.0.Raw material is melted at 1500~1550 DEG C, then is down to 1280~1350 DEG C, with fine aluminium deoxidation；Heat preservation 5~10 minutes, in 1230~1280 DEG C of cast alloys.Ingot casting hardness of the present invention HRC67.0~70.8,12.6~18.0J/cm of impact flexibility2, 1280~1600MPa of bending strength.

Description

A kind of molybdenum element segregation toughening high hardness alloy and its casting method
Technical field
The invention belongs to high-hardness and wear-resistant cast-iron field, be related to a kind of molybdenum element toughening hard phase and supersaturated solid solution, The wear and corrosion resistant cast iron and its casting method of martensitic matrix phase composition can be widely used for the row such as electric power, metallurgy, machinery, chemical industry Mechanical wearing piece manufacture in industry.
Technical background
Fe-Cr-B-C abrasion resistant casting alloys are with Fe2B or M2B hard phases are hard phase, have good toughness and height hard Degree, high corrosion-resistant, melting-casting manufacturability is good, has very wide application prospect.
Hard phase M in Fe-B alloys2B (M represents the alloying elements such as Fe, Cr, V, the Nb dissolved in boride) is in continuous Net distribution destroys the continuity of matrix completely, causes the toughness of alloy relatively low, is very difficult to apply in the larger evil of the power that is hit In bad operating condition, therefore its application range is made to be restricted.Using high-temperature heat treatment, RE Modified, the means such as alloying improve The continuous net-shaped distributional pattern of boride carries out Strengthening and Toughening processing to Fe-B alloys, expands its use scope, it is resistance to give full play to its It is a highly important project to grind potentiality, but presently done research obtains substantive breakthroughs not yet.
The intensity of Fe-B alloy substrate phases is further increased, and retains a certain amount of Fe2B or M2B hard phases, then can be achieved High rigidity, high tenacity.Amorphous/nanocrystalline, supersaturated solid solution, martensite etc. all have very high intensity and hardness, toughness good It is good, and corrosion resistance is good, can form new high rigidity, high corrosion-resistant alloy by the amorphous/nanocrystalline of matrix phase as a result,.
Patent document 1：The antifriction alloy hardness of 105695884 B of Authorization Notice No. CN, preparation are HRC66~70, impact 4~9J/cm of toughness2.The hardness of class alloy prepared by the patented method is higher, but impact flexibility is insufficient, and intensity index is relatively low, resists Curved intensity is relatively low, in 346~477MPa ranges, limits that the Alloyapplication is big in some external loads, needs impact resistance masterpiece Occasion.
Ti (C, N) based ceramic metal originates from last century the seventies.1971, Kieffer had found to make pottery in TiC Base Metals When introducing N in porcelain, as long as Mo or Mo appropriate are added in Binder Phase2C is achieved with property more better than TiC based ceramic metal Energy.With the intensification recognized its alloying action, sintering technology and equipment are continuously improved, and such material not only has higher Hardness, wearability, red hardness, friction coefficient extremely low between excellent chemical stability and metal, and it is also certain tough Property and intensity.
The main component of Ti (C, N) based ceramic metal is TiC, TiN or Ti (C, N), using W or Ni as binder, with other Carbide is additive, such as WC, Mo2C, (Ta, Nb) C, Cr3C2, VC, AlN etc..They are formd (Ti, W, Mo, Cr, V) (C, N) Solid solution strengthens hard phase by solution strengthening mechanism.Its microstructure characteristic is usually：TiC or Ti (C, N) hard phase are Core, the loop configuration (SS phases) and Ni, W and dissolve in therein that edge is (Ti, Mo) C or (Ti, Mo) (C, N) solid solution forms Binder Phase (r phases) three parts of the compositions such as Ti, Mo, C, N form.It such as adds WC, TaC and similarly produces SS phases.This is because Mo2C, TiC, WC, TaC are dissolved into liquid phase, and the result being precipitated on TiC or Ti (C, N) coarse granule.It is raw around hard phase At SS phases, wetabilitys of the Ni to Ti (C, N) is improved, it is suppressed that Ti (C, N) crystal grain is grown up, and carbide grain refinement is conducive to.
Invention content
The object of the present invention is to provide a kind of molybdenum element segregation toughening high hardness alloy and its casting methods.The alloy with Fe2(B, C) or M2(B, C) is hard phase, using non-equilibrium phases such as the multielement supersaturated solid solution of high rigidity, martensites as matrix Tissue.Mo elements are added, segregation forms SS phases, it is suppressed that hard phase crystal grain is grown up, and hard phase is hindered to form continuous net-shaped knot Structure refines casting crystalline tissue.So that alloy, while keeping high rigidity, toughness and intensity are greatly improved, to With broader practice foreground.
High-wearing feature that the present invention selects, high corrosion-resistant Fe-Cr-B-C alloys are basic alloy, then add 1.8~3.0% Mo elements.The multi-element eutectic alloy containing Fe, Cr, B, C, Nb, V, elements such as w is formed, the mass percentage of each element is Cr： 9.0~13.0, B：2.6~2.9, C：0.7~0.9, Mo：1.8~3.0%, Nb：0.4~0.8, V：The content of 0.4~0.8, Mn Content less than 0.3, Si is less than 0.07, S, P：≤ 0.01, surplus Fe.Wherein C, B summation：3.3~3.6；C/Cr content ratios： 0.06~0.08；The summation of Nb, V are 0.5~1.0.
Mo is that the affinity of carbide, i.e. Mo and C is larger.With SS phase shapes in Ti (C, N) based ceramic metal Similar at mechanism, Mo elements can be with Fe2Among hard phase based on B or neighbouring segregation, formation chemical formula are similar to (Mo, Fe)x (B, C), the massive texture of x=2~3 prevent hard phase from forming continuous net-shaped structure or partial partition to refine hard phase Hard phase is directly connected to matrix phase, to improve the toughness and intensity of alloy.
Since Mo element proportions are larger, gross segregation is easy tod produce in melting, in the tough alloy of introducing Mo elements, The content of Mo is unsuitable excessively high, and Mo contents of the present invention should control in 1.8~3.0% ranges.
Referring to patent document 1, it is specific prepare alloy when, can be used ferrochrome (high-carbon, middle carbon, micro- carbon), ferro-boron, ferro-niobium, Vanadium iron, molybdenum-iron and pure iron etc. are according to component requirements dispensing.Raw material and its composition are listed in table 1.
Table 1 can be applied to prepare the raw material and composition of invention alloy
The material composition of table 1 is not unique, and specific ingredient raw material obtained by reality determine.Wherein ferrochrome, Crome metal, ferro-boron, molybdenum-iron, ferro-niobium and vanadium iron provide the content of Cr, B, Mo, Nb and V of invention alloy, and high carbon ferro-chrome is used for balancing C content.Pure iron can be electrical pure iron, electromagnetic pure iron or ingot iron.
Specific melting is with casting technique：
After weighing good corresponding raw material according to component requirements proportioning, induction furnace, vaccum sensitive stove etc. can be used and carry out melting system Standby alloy.Ferrochrome, crome metal, ferro-boron, ferro-niobium, vanadium iron, molybdenum-iron and pure iron are melted first, fusion temperature is higher than 1500~1550 DEG C so that pure iron and crome metal fully melt；Then furnace power is reduced, after melt temperature is down to 1280~1350 DEG C, is used The fine aluminium deoxidation of dispensing total amount 0.1~0.15%；Continue heat preservation about 5~10 minutes, rapid cast alloys, cast temperature is ranging from 1230~1280 DEG C.
Since designed alloy is eutectic composition, melt has good mobility fine, can be by various methods Casting and forming, as normal sands Mold casting or model casting, lost foam casting, permanent mold casting, ceramic mold casting, die casting, The special casting method such as centrifugal casting.
Designed alloy has deep eutectic ingredient, and non-equilibrium matrix group can be formed under the conditions of common sand casting It knits, such as supersaturated solid solution, amorphous, nanocrystalline or martensitic structure.In order to promote matrix that non-equilibrium transformation occurs, from solidification temperature The cooling velocity spent between 600 DEG C should be not less than 60 DEG C/min, can be by placing the means such as chill in water cooling, swage, mold It realizes.But volume change can be caused since non-equilibrium transformation occurs, causes to answer since temperature is inconsistent when preparing heavy castings Power cracking phenomena, therefore, casting should release the constraint of mold between 600~800 DEG C.
Stress relief annealing technique and necessary machining processes less than 600 DEG C subsequently can be used in ingot casting.
The present invention's is mainly characterized by using Mo elements and the strong feature of C element binding force, to boron, the carbon in high rigidity During compound is precipitated, occur forming the segregation of Mo elements among these compounds, so that continuous net-shaped structure It is interrupted, crystal grain refinement；Matrix mutually remains as Cr, B, C, Mo, Nb, V reinforcing non-equilibrium microstructure of high rigidity simultaneously.So that casting Alloy is made while keeping high rigidity, impact flexibility and bending strength are promoted.Ingot casting average hardness reach HRC67.0~ 70.8, impact flexibility reaches 12.6~18.0J/cm2, bending strength reaches 1280~1600MPa.
Description of the drawings
1 low power cast sturcture of Fig. 1 present examples schemes；
2 high power cast sturcture of Fig. 2 present examples schemes；
The EDS analysis charts of segregation phase in the 4 casting metallographic structure of Fig. 3 present examples.
Specific implementation mode
The various method of smelting of the present invention, casting method are not limited by following examples, and any right in the present invention is wanted The improvement in range and variation for asking book claimed are all within protection scope of the present invention.
It is raw material to select high carbon ferro-chrome, chromic carbide iron, crome metal, ferro-boron, ferro-niobium, vanadium iron, ingot iron, molybdenum-iron etc., It invents in desired composition range and is configured to alloy.
It is raw material that embodiment 1., which selects high carbon ferro-chrome, chromic carbide iron, ferro-boron, ferro-niobium, vanadium iron, molybdenum-iron and ingot iron, at Divide range as follows：Cr:10.0wt.%；B:2.9wt.%；C:0.7wt.%；Nb:0.4wt.%；V:0.2wt.%；Mo: 1.8wt.%；Impurity element control is shown in Table 2.
After weighing good corresponding raw material according to component requirements proportioning, using induction melting and sand mold die cast.Specific steps For：
First by high carbon ferro-chrome, chromic carbide iron, ferro-boron, ferro-niobium, vanadium iron, molybdenum-iron and ingot iron, fusion temperature 1500 ℃；Then furnace power is reduced, after melt temperature is down to 1280 DEG C, with the fine aluminium deoxidation of dispensing total amount 0.15%；After continuation of insurance Temperature about 5 minutes, rapid cast alloys, ranging from 1230 DEG C of cast temperature.
About 6 minutes after having cast, open sand mould, at this time ingot casting temperature be less than 800 DEG C, from setting temperature to 800 DEG C it Between cooling rate be about 70 DEG C/min.It is air-cooled to room temperature.
1 ingot casting fractograph of embodiment is shown in Fig. 1, is made of torulose α-Fe primary crystals and eutectic structure, wherein eutectic group It is woven to α-Fe and hard phase line and staff control, continuous network structure does not occur in hard phase.In terms of performance, hardness HRC67.8 is said The bright not simple ferrite of the primary crystal largely occurred, the martensite containing Cr, W, B, C solution strengthening or amorphous/nanometer The non-equilibrium microstructures such as crystalline substance, because ferrite can not possibly reach corresponding hardness.As it can be seen that the addition of W changes the group of casting alloy Constituent is knitted, the hardness and toughness of matrix are improved, to greatly improve the toughness and intensity of material.
Gained ingot casting average hardness reaches HRC67.8, and impact flexibility reaches 15.6J/cm2, bending strength reaches 1468MPa。
It is raw material that embodiment 2., which selects high carbon ferro-chrome, crome metal, ferro-boron, ferro-niobium, molybdenum-iron and ingot iron, and composition range is such as Under：Cr:10.0wt.%；B:2.7wt.%；C:0.7wt.%；Nb:0.5wt.%；Mo:3.0wt.%；Impurity element control is shown in Table 2.
After weighing good corresponding raw material according to component requirements proportioning, vacuum induction melting and the casting of water cooling swage can be used It makes.The specific steps are：
First by high carbon ferro-chrome, crome metal, ferro-boron, ferro-niobium, molybdenum-iron and ingot iron, fusion temperature is 1550 DEG C；Then Furnace power is reduced, after melt temperature is down to 1350 DEG C, with the fine aluminium deoxidation of dispensing total amount 0.1%；Continue about 10 points of heat preservation Clock, rapid cast alloys, cast temperature are 1280 DEG C.
About 10 minutes after having cast, water cooling swage is opened, ingot casting temperature is less than 600 DEG C at this time, from setting temperature to 600 DEG C Between cooling rate be about 70 DEG C/min.It is air-cooled to room temperature.
2 high power cast sturcture of Fig. 2 examples schemes, figure it is seen that hard phase is mutually interspersed with matrix, without even Continuous reticular structure.And occur that a large amount of apparent contrasts are inconsistent in the upper surface of these phases, but without apparent crystal boundary Patch, these patches are exactly the product of Mo segregations, their appearance thinning microstructure, and further prevent forming continuous net-shaped knot Structure, the performance indicators such as toughness and bending strength to improve material.
Gained ingot casting hardness reaches HRC70.8, and impact flexibility reaches 12.6J/cm2, bending strength reaches 1280MPa.
It is raw material, composition range that embodiment 3., which selects high carbon ferro-chrome, chromic carbide iron, ferro-boron, ferro-niobium, molybdenum-iron and ingot iron, It is as follows：Cr：10.0wt.%；B：2.7wt.%；C:0.8wt.%；Nb:0.6wt.%；Mo:2.8wt.%；Impurity element controls It is shown in Table 2.
After good corresponding raw material being weighed according to component requirements proportioning, using induction melting and model casting, the specific steps are：
High carbon ferro-chrome, chromic carbide iron, ferro-boron, ferro-niobium, molybdenum-iron and ingot iron are melted first, fusion temperature 1560 ℃；Then furnace power is reduced, after melt temperature is down to 1320 DEG C, with the fine aluminium deoxidation of dispensing total amount 0.12%；After continuation of insurance Temperature about 8 minutes, rapid cast alloys, ranging from 1260 DEG C of cast temperature.
About 10 minutes after having cast, sand mold fusible pattern is opened, ingot casting temperature is less than 700 DEG C at this time, from setting temperature to 700 DEG C Between cooling rate be about 60 DEG C/min.It is air-cooled to room temperature.
Gained ingot casting hardness reaches HRC69.0, and impact flexibility reaches 13.9J/cm2, bending strength reaches 1600MPa.
It is raw material, ingredient that embodiment 4., which selects high carbon ferro-chrome, crome metal, ferro-boron, ferro-niobium, vanadium iron, molybdenum-iron and ingot iron, Range is as follows：Cr：11.0wt.%；B：2.7wt.%；C:0.7wt.%；Nb:0.2wt.%；V:0.4wt.%；Mo: 2.0wt.%；Impurity element control is shown in Table 2.
After good corresponding raw material being weighed according to component requirements proportioning, using induction melting and sand casting, the specific steps are：
High carbon ferro-chrome, crome metal, ferro-boron, ferro-niobium, vanadium iron, molybdenum-iron and ingot iron are melted first, fusion temperature is 1520℃；Then furnace power is reduced, after melt temperature is down to 1330 DEG C, with the fine aluminium deoxidation of dispensing total amount 0.14%；After Continuation of insurance temperature about 7 minutes, rapid cast alloys, ranging from 1250 DEG C of cast temperature.
About 7 minutes after having cast, open sand mould, at this time ingot casting temperature be less than 800 DEG C, from setting temperature to 800 DEG C it Between cooling rate be about 60 DEG C/min.It is air-cooled to room temperature.
Fig. 3 is segregation phase EDS collection of illustrative plates and analysis result in casting alloy, as a result EDS can only be shown in the qualitative analysis of ingredient Show in alloy there are Mo elements, illustrates that Mo elements form segregation, block continuous net-shaped structure, improve the toughness of alloy.
Gained ingot casting average hardness reaches HRC70, and impact flexibility reaches 14.2J/cm2, bending strength reaches 1420MPa.
It is raw material that embodiment 5., which selects high carbon ferro-chrome, chromic carbide iron, ferro-boron, ferro-niobium, vanadium iron, molybdenum-iron and ingot iron, at Divide range as follows：Cr：10.0wt.%；B：2.6wt.%；C：0.6wt.%；Nb：0.3wt.%；V：0.1wt.%；Mo: 2.3wt.%；Impurity element control is shown in Table 2.
After weighing good corresponding raw material according to component requirements proportioning, using induction melting and lost foam casting, specific steps It is as follows：
High carbon ferro-chrome, chromic carbide iron, ferro-boron, ferro-niobium, vanadium iron, molybdenum-iron, ingot iron are melted first, fusion temperature is 1540℃；Then furnace power is reduced, after melt temperature is down to 1320 DEG C, with the fine aluminium deoxidation of dispensing total amount 0.12%；After Continuation of insurance temperature about 9 minutes, rapid cast alloys, ranging from 1250 DEG C of cast temperature.
About 8 minutes after having cast, disappearance model sand mold is opened, ingot casting temperature is less than 700 DEG C at this time, from setting temperature to 700 Cooling rate between DEG C is about 70 DEG C/min.It is air-cooled to room temperature.
Gained ingot casting hardness reaches HRC67.0, and impact flexibility reaches 16.7J/cm2, bending strength reaches 1390MPa.
It is raw material, composition range that embodiment 6., which selects high carbon ferro-chrome, chromic carbide iron, ferro-boron, ferro-niobium, molybdenum-iron and ingot iron, It is as follows：Cr：10.0wt.%；B：2.6wt.%；C：0.8wt.%；Nb：0.8wt.%；Mo:2.1wt.%；Impurity element controls It is shown in Table 2.
It is specific to walk using vacuum induction melting and iron mould casting after weighing good corresponding raw material according to component requirements proportioning It is rapid as follows：
First by high carbon ferro-chrome, chromic carbide iron, ferro-boron, ferro-niobium, molybdenum-iron and ingot iron, fusion temperature is 1530 DEG C；So After reduce furnace power, after melt temperature is down to 1300 DEG C, with the fine aluminium deoxidation of dispensing total amount 0.15%；Continue heat preservation about 10 Minute, rapid cast alloys, ranging from 1250 DEG C of cast temperature.
About 10 minutes after having cast, open sand mould, at this time ingot casting temperature be less than 600 DEG C, from setting temperature to 600 DEG C it Between cooling rate be about 70 DEG C/min.It is air-cooled to room temperature.
Gained ingot casting hardness reaches HRC68.0, and impact flexibility reaches 14.3J/cm2, bending strength reaches 1460MPa.
It is raw material that embodiment 7., which selects high carbon ferro-chrome, chromic carbide iron, ferro-boron, ferro-niobium, vanadium iron, molybdenum-iron and ingot iron, at Divide range as follows：Cr：11.0wt.%；B：2.6wt.%；C：0.9wt.%；Nb：0.2wt.%；V：0.2wt.%；Mo: 2.5wt.%；Impurity element control is shown in Table 2.
After weighing good corresponding raw material according to component requirements proportioning, induction melting and lost foam casting can be used.Specific step It is rapid as follows：
High carbon ferro-chrome, chromic carbide iron, ferro-boron, ferro-niobium, vanadium iron, molybdenum-iron and ingot iron are melted first, fusion temperature is 1550℃；Then furnace power is reduced, after melt temperature is down to 1280 DEG C, with the fine aluminium deoxidation of dispensing total amount 0.10%；After Continuation of insurance temperature about 5 minutes, rapid cast alloys, ranging from 1250 DEG C of cast temperature.
About 9 minutes after having cast, disappearance model sand mold is opened, ingot casting temperature is less than 600 DEG C at this time, from setting temperature to 600 Cooling rate between DEG C is about 70 DEG C/min.It is air-cooled to room temperature.
Gained ingot casting hardness reaches HRC67.5, and impact flexibility reaches 18.0J/cm2, bending strength reaches 1520MPa.
It is raw material that embodiment 8., which selects high carbon ferro-chrome, chromic carbide iron, ferro-boron, ferro-niobium, molybdenum-iron, vanadium iron and ingot iron, at Divide range as follows：Cr：13.0wt.%；B：2.6wt.%；C：0.8wt.%；Nb：0.6wt.%；V：0.4wt.%；Mo: 2.2wt.%；Impurity element control is shown in Table 2.
After weighing good corresponding raw material according to component requirements proportioning, using induction melting and lost foam casting, specific steps It is as follows：
High carbon ferro-chrome, chromic carbide iron, ferro-boron, ferro-niobium, vanadium iron, molybdenum-iron and ingot iron are melted first, fusion temperature is 1540℃；Then furnace power is reduced, after melt temperature is down to 1320 DEG C, with the fine aluminium deoxidation of dispensing total amount 0.13%；After Continuation of insurance temperature about 7 minutes, rapid cast alloys, ranging from 1260 DEG C of cast temperature.
About 9 minutes after having cast, disappearance model sand mold is opened, ingot casting temperature is less than 700 DEG C at this time, from setting temperature to 700 Cooling rate between DEG C is about 60 DEG C/min.It is air-cooled to room temperature.
Gained ingot casting hardness reaches HRC69, and impact flexibility reaches 17.6J/cm2, bending strength reaches 1426MPa.
Casting alloy performance detection prepared by each embodiment is as described below：
1. pair example casting metal carries out hardness test using HR-150A Rockwell hardness machines, load 150Kg makes a call to five It is averaged after point, is listed in table 2.
2. pair example casting metal carries out impact flexibility test using JBS-300B shock machines, range 150J is beaten It is averaged after five samples, is listed in table 2.
3. pair example casting metal material electronics universal testing machine carries out three-point bending resistance experiment, sample size is 2 × 5 × The rectangular specimen of 50mm, span 30mm take the bending strength average value of three same treatment samples to be listed in table 2.
The ingredient of 2 embodiment of table and hardness, impact flexibility and bending strength

Claims (4)

1. a kind of molybdenum element segregation toughening high hardness alloy, it is characterised in that：The mass percentage of alloy each element is Cr： 9.0~13.0, B：2.6~2.9, C：0.7~0.9, Mo：1.8~3.0%, Nb：0.4~0.8, V：The content of 0.4~0.8, Mn Content less than 0.3, Si is less than 0.07, S, P：≤ 0.01, surplus Fe；Wherein C and B gross masses percentage composition is：3.3~ 3.6；C/Cr content ratios：0.06~0.08；The gross mass percentage composition of Nb and V is 0.5~1.0.
2. the casting method of molybdenum element segregation toughening high hardness alloy as described in claim 1, it is characterised in that including following Step：
After weighing good corresponding raw material according to component requirements proportioning, alloy is prepared using induction furnace melting, first by ferrochrome, metal Chromium, ferro-boron, ferro-niobium, vanadium iron, molybdenum-iron and pure iron fusing, 1500~1550 DEG C of fusion temperature so that pure iron and crome metal are fully molten Change；Then furnace power is reduced, after melt temperature is down to 1280~1350 DEG C, with the fine aluminium of dispensing total amount 0.1~0.15% Deoxidation；Continue heat preservation 5~10 minutes, cast alloys, ranging from 1230~1280 DEG C of cast temperature；From setting temperature to 600 DEG C Between cooling velocity be not less than 60 DEG C/min, pass through in water cooling, swage or mold place chill means realize.
3. the casting method of molybdenum element segregation toughening high hardness alloy as claimed in claim 2, it is characterised in that：It prepares large-scale When casting, casting releases mold between 600~800 DEG C.
4. the casting method of molybdenum element segregation toughening high hardness alloy as claimed in claim 2, it is characterised in that：Described is pure Iron is electrical pure iron, electromagnetic pure iron or ingot iron.
CN201810588898.7A 2018-06-08 2018-06-08 A kind of molybdenum element segregation toughening high hardness alloy and its casting method Withdrawn CN108570614A (en)

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CN201810588898.7A CN108570614A (en) 2018-06-08 2018-06-08 A kind of molybdenum element segregation toughening high hardness alloy and its casting method
CN201910431573.2A CN110029284A (en) 2018-06-08 2019-05-22 A kind of molybdenum toughening cast iron and its manufacture and heat treatment method

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Application publication date: 20180925