CN111926237A - Surface alloying method for wear-resistant steel casting - Google Patents

Surface alloying method for wear-resistant steel casting Download PDF

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Publication number
CN111926237A
CN111926237A CN202010836892.4A CN202010836892A CN111926237A CN 111926237 A CN111926237 A CN 111926237A CN 202010836892 A CN202010836892 A CN 202010836892A CN 111926237 A CN111926237 A CN 111926237A
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China
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powder
wear
casting
alloying
resistant steel
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CN202010836892.4A
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Chinese (zh)
Inventor
李玉和
万维财
樊坤阳
李彬
李政昊
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Xihua University
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Xihua University
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Priority to CN202010836892.4A priority Critical patent/CN111926237A/en
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting
    • C22C33/06Making ferrous alloys by melting using master alloys
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/18Measures for using chemical processes for influencing the surface composition of castings, e.g. for increasing resistance to acid attack
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C35/00Master alloys for iron or steel

Abstract

The invention belongs to the technical field of casting, and particularly relates to a wear-resistant steel casting surface alloying method which comprises the steps of crushing high-carbon ferrochrome, tungsten carbide and ferrovanadium into 80-150 meshes, adding 150-250 meshes of reduced iron powder, uniformly stirring, wherein the adding amounts of the high-carbon ferrochrome powder, the tungsten carbide powder, the ferrovanadium powder and the reduced iron powder are 65-75%, 5-10% and 10-20% respectively, pressing the uniformly mixed metal powder into 3-5 mm alloy powder blocks in a mold, embedding or attaching and fixing the alloy powder blocks on the surface of a casting mold, pouring 1550-1600 ℃ high-temperature molten steel, and obtaining a wear-resistant alloy layer with the thickness of 5.0-8.0 mm on a casting working layer. The wear-resistant alloy layer on the surface of the casting produced by the invention has high bonding strength with the body, good wear resistance and simple process operation, and is suitable for producing wear-resistant steel castings locally needed in the fields of metallurgy, mines, cement and the like.

Description

Surface alloying method for wear-resistant steel casting
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a surface alloying method for a wear-resistant steel casting.
Background
The alloy layer can improve the wear resistance, heat resistance, corrosion resistance and other properties of the casting according to the characteristics of the alloy, thereby prolonging the service life of the casting. The alloying of casting surface has wide application range, and the performance of cast iron, steel, copper alloy, aluminum alloy, etc. may be improved with the said method. The surface alloying of the casting has the advantage of ensuring that the wear-resistant surface of the casting is made of wear-resistant materials and the bonding surface is metallurgical bonding.
In order to obtain an alloy layer on the surface of a casting, the prior art generally realizes alloying on the surface of the casting by adding water glass, resin binder and the like into an alloying coating or a paste coating block. For example, CN105834353A discloses a casting method of a highly wear-resistant cement mortar ball valve body, which comprises adding a proper amount of water, acrylic acid, ammonium persulfate and the like into polyvinyl alcohol, mixing and grinding with ferrovanadium powder and the like uniformly to form casting infiltration coating, uniformly covering the surface of a dried sand core, pouring cast steel metal liquid, and performing sand shakeout cleaning and heat treatment to obtain the highly wear-resistant cement mortar ball valve body; CN107414058A discloses a surface alloying method for a high-strength wear-resistant casting, which is to dope nano silicon carbide into high-carbon ferrochrome alloy powder by a spray doping method to obtain nano silicon carbide # high-carbon ferrochrome doped alloy powder, then mix and grind the nano silicon carbide # high-carbon ferrochrome doped alloy powder with borax and phenolic resin to obtain an alloy layer coating, coat the alloy layer coating on the surface of a casting mold and solidify the alloy layer coating, pour molten iron into the casting mold, and obtain the high-strength wear-resistant casting after cooling, sand removal and grinding; CN103406519A discloses a coating alloy powder for casting surface alloying and an alloying method, high-carbon ferrochrome, ferrochrome nitride, ferroboron, ferrovanadium and rare earth magnesium ferrosilicon are ground into 80-120 meshes by a ball mill, then zinc powder of 150 meshes and 250 meshes is added and stirred uniformly, then a proper amount of resin, sodium tetraborate and alcohol are added and stirred further, finally the mixture is coated on the surface of a casting mold, high-temperature molten metal is directly poured into the casting mold, and then the casting mold is opened and air cooled to obtain a wear-resistant alloy layer; CN1139157 discloses a casting surface alloying process, which is characterized by that the mould plate also includes mould sample is drawn into negative pressure, the sealing film covered on the mould plate is tightly attached to the mould plate, then the film of the mould sample correspondent to the specific surface of the casting with special property or good comprehensive property requirements is coated with coating material, and on the film the reinforcing material is laid, then the thin paper with a certain quantity of pinholes is used to cover on the reinforcing material, then the vacuum moulding method is used to make sand mould, so that the reinforcing material layer attached to the mould sample is adsorbed on the sand mould, finally under the negative pressure state the sand box is passed through the processes of box-assembling, pouring and falling so as to obtain the casting with alloyed surface. CN1066013 proposes a novel surface alloying process in which a tungsten carbide alloy powder is prepared as a surface material precast block by a high-pressure forming technology without using a binder, cheap 40Cr steel or austempered ductile iron is used as a base material, and a casting mold adopts technical measures such as local heat preservation and exhaust around the precast block; CN107774890B discloses a method for preparing a chrome-iron-containing coating for cast-infiltration, which comprises the steps of grinding ferrochrome by a dry method and a wet method, wherein the particle size of the ferrochrome reaches 8um, mixing a polyacrylic alcohol solvent as a binder with ferrochrome particles, so that the ferrochrome particles and molten steel have good wettability, and adsorbing the ferrochrome particles on the surface of a mould for surface alloying. By comparison, the following disadvantages are obvious in the method: the casting surface alloying process is characterized in that water glass, resin binder and the like are added into an alloying coating or a paste coating block, the problems of poor metallurgical bonding quality between an alloy layer and base metal, air holes between an alloying layer and a body bonding part, slag inclusion and the like exist, the bonding strength of the surface alloying layer is influenced, and the performances of the alloy layer such as wear resistance and the like are influenced.
Disclosure of Invention
The invention aims to solve the problems and the defects of the prior art, provides a simple and convenient wear-resistant steel casting surface alloying method, is favorable for ensuring the bonding strength of a surface alloying layer and improving the wear resistance of the alloy layer.
The technical scheme of the invention is as follows: a method for alloying the surface of a wear-resistant steel casting comprises the steps of firstly crushing high-carbon ferrochrome, tungsten carbide and ferrovanadium into fine powder of 80-150 meshes, then adding 150-250 meshes of reduced iron powder, and uniformly stirring, wherein the adding amounts of the high-carbon ferrochrome powder, the tungsten carbide powder, the ferrovanadium powder and the reduced iron powder are 65-75%, 5-10% and 10-20% respectively, then pressing the uniformly mixed powder in a mold to prepare an alloy powder block with a certain thickness, finally fixing the alloy powder block on the surface of a mold cavity, and pouring 1550-1600 ℃ high-temperature molten steel to form an alloy layer with a certain thickness on the surface of the wear-resistant steel casting at the position of the fixed alloy powder block.
The surface alloying method of the wear-resistant steel casting comprises the following chemical components of 60-65% of Cr, 6.0-7.0% of C, 2.0-3.0% of Si and the balance of Fe.
The surface alloying method of the wear-resistant steel casting comprises the following chemical components of 58-65% of V, 2.5-3.5% of C, 1.0-2.0% of Si and the balance of Fe.
The wear-resistant steel casting surface alloying method is characterized in that the chemical components of the reduced iron powder are less than or equal to 0.02 percent of C, less than or equal to 0.2 percent of Si, less than or equal to 0.2 percent of Mn and the balance of Fe.
According to the surface alloying method for the wear-resistant steel casting, the thickness of the alloy powder block is 3-5 mm.
The surface alloying method of the wear-resistant steel casting is characterized in that the loose packing density of the reduced iron powder is 1.5-2.5 g/cm3
The surface alloying method of the wear-resistant steel casting comprises the steps of pre-embedding or attaching and fixing the alloy powder block on the surface of a casting mold cavity, directly pouring molten metal steel into the pre-embedded or attached and fixed position of the alloy powder block, wherein the pre-embedded or attached and fixed position corresponds to a working surface of the casting, which requires wear resistance, and directly using the casting after sand removal and polishing.
According to the surface alloying method for the wear-resistant steel casting, the thickness of the alloy layer on the surface of the wear-resistant steel casting is 5-8 mm.
The invention has the beneficial effects that: (1) high-carbon ferrochrome powder, tungsten carbide powder and ferrovanadium powder are added, the powder can be melted by poured high-temperature molten steel, a chromium-carbon compound and a vanadium-carbon compound are formed in the cooling and solidifying process, the formed chromium-carbon, vanadium-carbon compound and added tungsten carbide have high hardness, the hardness and wear resistance of an alloy layer are improved by the high-hardness phases, and the hardness of the alloy layer can reach HRC 55-62; (2) the reduced iron powder with the granularity of 150-250 meshes and the bulk density of 1.5-2.5 g/cm is added, the formability of the alloy powder block is improved after the reduced iron powder is added, the compressibility is good, the particle sizes are different, and smaller particles are filled in large particle gaps, so that the alloy powder block can be favorably pressed in a mold, and the alloy powder block can be favorably embedded or attached and fixed on the surface of a casting mold cavity; (3) the alloy powder block with the thickness of 3-5 mm is pressed in the die, and after high-temperature molten steel is poured, the thickness of the wear-resistant alloy layer on the surface of the steel casting is 5-8 mm, so that the production cost of the wear-resistant cast steel is reduced.
Detailed Description
The present invention is further described in the following examples, which are intended to illustrate some, but not all, of the embodiments of the present invention, and all other embodiments obtained by a person of ordinary skill in the art without any inventive step based on the embodiments of the present invention are within the scope of the present invention, and the features in the following examples can be combined with each other without conflict.
The invention relates to a surface alloying method of wear-resistant steel castings, which takes high-carbon ferrochrome powder, tungsten carbide powder, ferrovanadium powder and reduced iron powder as alloying powder, presses the alloying powder into an alloy powder block in a mould, pre-embeds or attaches the alloy powder block to the surface of a mould cavity of a casting mould, and forms a wear-resistant alloy layer on the local surface of the casting after pouring high-temperature molten steel. The preparation method comprises the following steps:
(1) grinding high-carbon ferrochrome, tungsten carbide and ferrovanadium into 80-150 meshes, and uniformly mixing;
(2) adding reduced iron powder into the mixture in the step (1) and uniformly mixing;
(3) pressing and forming the mixture obtained in the step (2) under a die, wherein the thickness of the pressed alloy powder block is 3-5 mm;
(4) pre-burying, attaching and fixing the alloy powder block obtained in the step (3) on the surface of a casting mold;
(5) and pouring 1550-1600 ℃ high-temperature molten steel into the casting mold of the pre-embedded alloy powder block, cooling and cleaning, and obtaining a wear-resistant alloy layer with the thickness of 5.0-8.0 mm on the surface of the casting.
The high-carbon ferrochrome comprises 60-65% of Cr, 6.0-7.0% of C, 2.0-3.0% of Si and the balance of Fe.
The ferrovanadium comprises the chemical components of 58-65% of V, 2.5-3.5% of C, 1.0-2.0% of Si, and the balance of Fe.
The chemical components of the reduced iron powder are less than or equal to 0.02 percent of C, less than or equal to 0.2 percent of Si, less than or equal to 0.2 percent of Mn and the balance of Fe.
The added iron powder has the granularity of 150-250 meshes and the apparent density of 1.5-2.5 g/cm3
The alloy powder has a bulk degree of 3-5 mm in thickness after being pressed in a die.
The first embodiment is as follows: firstly, crushing high-carbon ferrochrome, tungsten carbide and ferrovanadium into 80-150 meshes, then adding 150 meshes of reduced iron powder, uniformly stirring, wherein the adding amount of the high-carbon ferrochrome powder, the tungsten carbide powder, the ferrovanadium powder and the reduced iron powder is 65%, 5%, 10% and 20%, then pressing the uniformly mixed metal powder in a mould into 3mm alloy powder blocks, embedding and attaching the alloy powder blocks to the surface of a casting mould cavity, pouring 1550 ℃ high-temperature molten steel into the mould cavity, and obtaining a wear-resistant alloy layer with the thickness of 5.0mm on a casting working layer, wherein the thickness and hardness of the alloy layer can reach HRC 56.
Example two: firstly, crushing high-carbon ferrochrome, tungsten carbide and ferrovanadium into 80 meshes, then adding reduced iron powder of 250 meshes, uniformly stirring, wherein the adding amount of the high-carbon ferrochrome powder, the tungsten carbide powder, the ferrovanadium powder and the reduced iron powder is 75%, 7%, 8% and 15%, then pressing the uniformly mixed metal powder in a mould into an alloy powder block of 4mm, embedding and attaching the alloy powder block to the surface of a mould cavity of a casting mould, pouring high-temperature molten steel at 1580 ℃, obtaining a wear-resistant alloy layer with the thickness of 6.0mm on a casting working layer, wherein the thickness and hardness of the alloy layer can reach HRC 60.
Example three: firstly, crushing high-carbon ferrochrome, tungsten carbide and ferrovanadium into 100 meshes, then adding 200 meshes of reduced iron powder, uniformly stirring, wherein the adding amount of the high-carbon ferrochrome powder, the tungsten carbide powder, the ferrovanadium powder and the ferrovanadium powder is 70%, 10% and 10%, then pressing the uniformly mixed metal powder in a mould into an alloy powder block with the thickness of 5mm, embedding and attaching the alloy powder block to the surface of a mould cavity of a casting mould, pouring 1600 ℃ high-temperature molten steel, and obtaining a wear-resistant alloy layer with the thickness of 8.0mm on a casting working layer, wherein the thickness and hardness of the alloy layer can reach HRC 62.

Claims (7)

1. A wear-resistant steel casting surface alloying method is characterized by comprising the steps of firstly crushing high-carbon ferrochrome, tungsten carbide and ferrovanadium into fine powder of 80-150 meshes, then adding 150-250 meshes of reduced iron powder, uniformly stirring, wherein the adding amount of the high-carbon ferrochrome powder, the tungsten carbide powder, the ferrovanadium powder and the reduced iron powder is 65-75%, 5-10% and 10-20% respectively, pressing the uniformly mixed powder in a mold to prepare an alloy powder block with a certain thickness, finally fixing the alloy powder block on the surface of a casting mold cavity, pouring 1550-1600 ℃ high-temperature molten steel, and forming an alloy layer with a certain thickness on the surface of the wear-resistant steel casting at the position of the fixed alloy powder block.
2. The method for alloying the surface of the wear-resistant steel casting according to claim 1, wherein the high-carbon ferrochrome comprises 60-65% of Cr, 6.0-7.0% of C, 2.0-3.0% of Si, and the balance of Fe.
3. The method for alloying the surface of the wear-resistant steel casting according to claim 1, wherein the vanadium-iron alloy comprises 58-65% of V, 2.5-3.5% of C, 1.0-2.0% of Si, and the balance of Fe.
4. The method for alloying the surface of the wear-resistant steel casting according to claim 1, wherein the chemical components of the reduced iron powder are C less than or equal to 0.02, Si less than or equal to 0.2%, Mn less than or equal to 0.2%, and the balance Fe.
5. The method for alloying the surface of the wear-resistant steel casting according to claim 1, wherein the thickness of the alloy powder is 3-5 mm.
6. The method for alloying the surface of the wear-resistant steel casting as claimed in any one of claims 1 to 5, wherein the alloy powder block is pre-embedded or attached and fixed on the surface of the cavity of the casting mold, and the pre-embedded or attached and fixed position corresponds to a working surface of the casting requiring wear resistance.
7. The method for alloying the surface of the wear-resistant steel casting according to claim 6, wherein the thickness of the alloy layer on the surface of the wear-resistant steel casting is 5-8 mm.
CN202010836892.4A 2020-08-19 2020-08-19 Surface alloying method for wear-resistant steel casting Pending CN111926237A (en)

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Publication number Priority date Publication date Assignee Title
JPS61170579A (en) * 1985-01-25 1986-08-01 Toyota Motor Corp Formation of surface alloyed layer onto cast iron based material
CN103406519A (en) * 2013-07-25 2013-11-27 北京工业大学 Coated alloy powder used for casting surface alloying and alloying method
CN106367661A (en) * 2016-09-20 2017-02-01 机械科学研究总院先进制造技术研究中心 Preparation method for particle-reinforced iron-based surface composite material
CN108842039A (en) * 2018-08-13 2018-11-20 林州凤宝管业有限公司 A kind of Roll Collar production method based on WC hard alloy
CN109663900A (en) * 2018-12-26 2019-04-23 广东越科新材料有限公司 A kind of steel-based composite plate hammer and preparation method thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61170579A (en) * 1985-01-25 1986-08-01 Toyota Motor Corp Formation of surface alloyed layer onto cast iron based material
CN103406519A (en) * 2013-07-25 2013-11-27 北京工业大学 Coated alloy powder used for casting surface alloying and alloying method
CN106367661A (en) * 2016-09-20 2017-02-01 机械科学研究总院先进制造技术研究中心 Preparation method for particle-reinforced iron-based surface composite material
CN108842039A (en) * 2018-08-13 2018-11-20 林州凤宝管业有限公司 A kind of Roll Collar production method based on WC hard alloy
CN109663900A (en) * 2018-12-26 2019-04-23 广东越科新材料有限公司 A kind of steel-based composite plate hammer and preparation method thereof

Non-Patent Citations (2)

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Title
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