CN109967745A - A method of iron-base powder metallurgical product surface abrasion resistance is improved by electron beam remelting - Google Patents

A method of iron-base powder metallurgical product surface abrasion resistance is improved by electron beam remelting Download PDF

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Publication number
CN109967745A
CN109967745A CN201910268285.XA CN201910268285A CN109967745A CN 109967745 A CN109967745 A CN 109967745A CN 201910268285 A CN201910268285 A CN 201910268285A CN 109967745 A CN109967745 A CN 109967745A
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China
Prior art keywords
iron
electron
base powder
remelting
powder metallurgical
Prior art date
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Pending
Application number
CN201910268285.XA
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Chinese (zh)
Inventor
张莎莎
杨海屹
刘子利
姚正军
陶学伟
陆贤文
邹德华
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CHANGSHU HUA-DE POWDER METALLURGY Co Ltd
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CHANGSHU HUA-DE POWDER METALLURGY Co Ltd
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Priority to CN201910268285.XA priority Critical patent/CN109967745A/en
Publication of CN109967745A publication Critical patent/CN109967745A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02Compacting only
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10Sintering only
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22FWORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER
    • B22F3/00Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24After-treatment of workpieces or articles
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/08Ferrous alloys, e.g. steel alloys containing nickel
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/12Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/16Ferrous alloys, e.g. steel alloys containing copper

Abstract

The present invention relates to a kind of methods for improving iron-base powder metallurgical product surface abrasion resistance by electron beam remelting, and iron(-)base powder is prepared iron-base powder metallurgical product by compacting, sintering first;Sintered sintered metal product is fixed on the table, and sealing moulding chamber is simultaneously evacuated to high vacuum state;High-energy electron beam scanning is carried out to product surface, makes its surface melting, and quickly solidification.The electron beam surface remelting iron-base powder metallurgical product that the present invention prepares is cooled to room temperature rear surface and forms the uniform martensite remelting layer tissue of crystal grain fine tissue, and surface remelting layer is remarkably improved the hardness and wearability of product.

Description

It is a kind of that iron-base powder metallurgical product surface abrasion resistance is improved by electron beam remelting Method
Technical field
The present invention relates to field of powder metallurgy, and in particular to one kind improves iron-base powder metallurgical product by electron beam remelting The method of surface abrasion resistance.
Background technique
It is raw material that powder metallurgy, which is by producing metal powder, and passes it through forming and sintering, prepares metal material, answers The technology of condensation material and various types product.Due to PM technique have raw material availability is high, manufacturing cost is low, It can be had been more and more widely used in auto industry near-net-shape and the advantages that high Product Precision.But due to powder metallurgy system The problems such as product densification is low, Tissue distribution is uneven reduces its mechanical performance index, is not achieved higher for bearing load, resistance to The performance requirement of the demanding components of fretting wear.
Most common is by quenching, nitriding, and the heat treatment process such as carburizing improve the mechanical property of sintered metal product Energy and wearability.But conventional quenching technical has, and product deformation is serious, product brittleness is big, impact resistance and degraded toughness etc. ask Topic.And the presence of iron-base powder metallurgy material internal void keeps overall heat transfer rate lower than dense material, and harden ability is opposite It is poor.Though can improve wearability using carburizing or carbo-nitriding, process flow is complicated, and the precision of product reduces and infiltration layer is deep Degree is influenced greatly by density of material, porosity etc..Therefore, develop that one kind effectively improves iron-base powder metallurgical product hardness and surface is resistance to It can be reduced deformation while mill property again to guarantee that the surface treatment method of precision is outstanding to the application field for widening sintered metal product It is on precision component application have great importance.With development in science and technology occur induction heat treatment have deform it is small, The advantages that quench-hardened case is easy to control but that there are thermal conductivitys is low, uneven heating is even and easily there is residual ferrite, is also easy to produce crackle etc. and asks Topic.
Summary of the invention
The present invention is exactly to be directed to the problem of iron-base powder metallurgical product surface mechanical properties deficiency, provides one kind and effectively changes The method of kind iron-base powder metallurgical product hardness and surface abrasion resistance.
In order to achieve the above objectives, present invention provide the technical scheme that
A method of iron-base powder metallurgical product surface abrasion resistance is improved by electron beam remelting, comprising the following steps:
1) iron(-)base powder is prepared into iron-base powder metallurgical product by compacting, sintering first;
2) sintered sintered metal product is fixed on the table, sealing moulding chamber is simultaneously evacuated to high vacuum state;
3) high-energy electron beam scanning is carried out to product surface, makes its surface melting, and quickly solidification.
The ingredient of iron-base powder metallurgical product are as follows: it be 4.0%, Mo content is 0.5%, C that Cu content, which is 1.5%, Ni content, Content is 0.6%, surplus Fe.
In step 1), sample formation uses compression moulding, pressure 23T.
In step 1), maximum temperature is 1120 DEG C in sintering process, and sintering time is within 50min, furnace in sintering process It is inside passed through hydrogen, it is cooling cold using furnace.
In step 3) high-energy electron beam scanning, 8~10mA of electric current, voltage 60kV, scanning speed 10mm/s keep heat defeated 3J/mm out.
The electron beam surface remelting iron-base powder metallurgical product that the present invention prepares, is cooled to room temperature rear surface and forms crystalline substance The grain uniform martensite remelting layer tissue of fine tissue, surface remelting layer are remarkably improved the hardness and wearability of product.
Compared with prior art, the beneficial effects of the present invention are:
(1) high-power electron beam acts on product and can solve powdered metallurgical material void and draws the present invention in high vacuum conditions The low problem of the thermal conductivity risen, is heated evenly and is not likely to produce crackle;
(2) surface occurs rapid melting and solidification and generates even tissue simultaneously, the surface remelting layer of crystal grain refinement;
(3) electron beam heat input is small, and workpiece deformation is small, small to the heat affecting of matrix, thus can guarantee the precision of part.
Detailed description of the invention
Fig. 1 is the SEM photograph of embodiment 1.
Fig. 2 is the SEM photograph of product surface after 2 electron beam remelting of embodiment.
Fig. 3 is the microstructure picture of embodiment 1.
Fig. 4 is the microstructure photo of product surface after 2 electron beam remelting of embodiment.
Fig. 5 is the skin-friction coefficient curve comparison figure of embodiment 1 Yu embodiment 2.
Specific embodiment
The present invention is further explained in the light of specific embodiments.
Embodiment 1
First by metal powder by 23T pressure forming, rear be sent into net belt type sintering iron furnace is sintered, respectively at 1000 DEG C and Keep the temperature 6min at 1080 DEG C, keep the temperature 30min at 1120 DEG C, after in furnace Slow cooling, be passed through hydrogen in furnace in sintering process, It is prepared into iron-base powder metallurgical product.
Embodiment 2
First by metal powder by 23T pressure forming, rear be sent into net belt type sintering iron furnace is sintered, respectively at 1000 DEG C and Keep the temperature 6min at 1080 DEG C, keep the temperature 30min at 1120 DEG C, after in furnace Slow cooling, be passed through hydrogen in furnace in sintering process, Prepare iron-base powder metallurgical product.
Sintered sintered metal product is fixed on the table, and sealing moulding chamber is simultaneously evacuated to high vacuum state;Then Sample surfaces are strafed using the electron beam of electric current 8mA, voltage 60kV, scanning speed 10mm/s, keep thermal output 3J/mm, After cut intermediate fraction and inlayed, so as to its section performance change of later observation.
Embodiment 3
Difference between the present embodiment and embodiment 2 is to use the electron beam of 9mA, the voltage of electron beam, scanning Speed keeps thermal output constant.
Embodiment 4
Difference between the present embodiment and embodiment 2 is to use the electron beam of 10mA, the voltage of electron beam, scanning Speed keeps thermal output constant.
It is micro- to sintered metal product cross section progress of the invention that scanning electron microscope and microhardness testers are respectively adopted Structure observation, micro-hardness testing and reciprocating micro sliding rubbing machine is seen to test.
Scanning electron microscope partial results are as depicted in figs. 1 and 2, can be seen that electron beam weight from the comparison of two width figures Tissue after melting is more uniform, and pearlitic structrure disappears;The part of detecting result of optical microscopy is as shown in Figure 3 and Figure 4, can also Find out that tissue after electron beam remelting is the martensitic structure of fine uniform.
Friction test is all made of revolving speed 100t/m, load 10N;Microhardness surveys the region for having electron beam to influence and nothing respectively The hardness in the region that electron beam influences.Microhardness is executed according to standard GB/T 4340.1-2009.Test result such as 1 institute of table Show.
1 test result of table
The above is only presently preferred embodiments of the present invention, is not intended to limit the present invention in any form, any ripe Professional and technical personnel is known, without departing from the scope of the present invention, according to the technical essence of the invention, to the above reality Any simple modifications, equivalent substitutions and improvements etc. made by example are applied, it is fallen within the scope of protection of the technical scheme of the present invention It is interior.

Claims (5)

1. a kind of method for improving iron-base powder metallurgical product surface abrasion resistance by electron beam remelting, it is characterised in that: including Following steps:
1) iron(-)base powder is prepared into iron-base powder metallurgical product by compacting, sintering first;
2) sintered sintered metal product is fixed on the table, sealing moulding chamber is simultaneously evacuated to high vacuum state;
3) high-energy electron beam scanning is carried out to product surface, makes its surface melting, and quickly solidification.
2. the method according to claim 1 that iron-base powder metallurgical product surface abrasion resistance is improved by electron beam remelting, It is characterized by: the ingredient of iron-base powder metallurgical product are as follows: Cu content is that 1.5%, Ni content is that 4.0%, Mo content is 0.5%, C content 0.6%, surplus Fe.
3. the method according to claim 1 that iron-base powder metallurgical product surface abrasion resistance is improved by electron beam remelting, It is characterized by: sample formation uses compression moulding, pressure 23T in step 1).
4. the method according to claim 1 that iron-base powder metallurgical product surface abrasion resistance is improved by electron beam remelting, It is characterized by: maximum temperature is 1120 DEG C in sintering process, and sintering time is within 50min, in sintering process in step 1) Hydrogen is passed through in furnace, it is cooling cold using furnace.
5. the method according to claim 1 that iron-base powder metallurgical product surface abrasion resistance is improved by electron beam remelting, It is characterized by: in step 3) high-energy electron beam scanning, 8~10mA of electric current, voltage 60kV, 8~10mm/s of scanning speed, heat Export 3~4J/mm.
CN201910268285.XA 2019-04-03 2019-04-03 A method of iron-base powder metallurgical product surface abrasion resistance is improved by electron beam remelting Pending CN109967745A (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6223908A (en) * 1985-07-22 1987-01-31 Mitsubishi Metal Corp Manufacture of hardly workable metallic plate of high purity
JP2002161308A (en) * 2000-11-24 2002-06-04 Daido Steel Co Ltd Production method for high strength, high fatigue resistant steel for use in structural application
CN102206733A (en) * 2011-07-15 2011-10-05 桂林电子科技大学 Method for strengthening surface layer of nodular cast iron through high-energy electron beam scanning
CN103056373A (en) * 2013-01-24 2013-04-24 重庆聚能粉末冶金有限公司 Method for manufacturing starting ratchet wheel of motorcycle
CN103480850A (en) * 2013-10-10 2014-01-01 西安金欣粉末冶金有限公司 Powder metallurgy preparing method for heavy truck gearbox synchronizer gear hub
CN105296878A (en) * 2015-11-17 2016-02-03 中国兵器科学研究院宁波分院 Surface alloy strengthening method of aluminum-based piston ring grooves
CN106521384A (en) * 2016-11-03 2017-03-22 北京航空航天大学 Method used for improving Nb-Si based alloy oxidation resistance via electron beam remelting
CN106825581A (en) * 2016-12-30 2017-06-13 青岛卓思三维智造技术有限公司 Metal surface remelting method and device
CN107043933A (en) * 2017-04-14 2017-08-15 广西大学 A kind of method for preparing zero defect cladding layer in Cast Iron Surface

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6223908A (en) * 1985-07-22 1987-01-31 Mitsubishi Metal Corp Manufacture of hardly workable metallic plate of high purity
JP2002161308A (en) * 2000-11-24 2002-06-04 Daido Steel Co Ltd Production method for high strength, high fatigue resistant steel for use in structural application
CN102206733A (en) * 2011-07-15 2011-10-05 桂林电子科技大学 Method for strengthening surface layer of nodular cast iron through high-energy electron beam scanning
CN103056373A (en) * 2013-01-24 2013-04-24 重庆聚能粉末冶金有限公司 Method for manufacturing starting ratchet wheel of motorcycle
CN103480850A (en) * 2013-10-10 2014-01-01 西安金欣粉末冶金有限公司 Powder metallurgy preparing method for heavy truck gearbox synchronizer gear hub
CN105296878A (en) * 2015-11-17 2016-02-03 中国兵器科学研究院宁波分院 Surface alloy strengthening method of aluminum-based piston ring grooves
CN106521384A (en) * 2016-11-03 2017-03-22 北京航空航天大学 Method used for improving Nb-Si based alloy oxidation resistance via electron beam remelting
CN106825581A (en) * 2016-12-30 2017-06-13 青岛卓思三维智造技术有限公司 Metal surface remelting method and device
CN107043933A (en) * 2017-04-14 2017-08-15 广西大学 A kind of method for preparing zero defect cladding layer in Cast Iron Surface

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
盛晓敏,邓朝晖主编: "《先进制造技术》", 30 September 2000, 机械工业出版社 *

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