CN102086501A - Ion nitrocarburizing treatment method for iron-based sintered material - Google Patents
Ion nitrocarburizing treatment method for iron-based sintered material Download PDFInfo
- Publication number
- CN102086501A CN102086501A CN2009102000999A CN200910200099A CN102086501A CN 102086501 A CN102086501 A CN 102086501A CN 2009102000999 A CN2009102000999 A CN 2009102000999A CN 200910200099 A CN200910200099 A CN 200910200099A CN 102086501 A CN102086501 A CN 102086501A
- Authority
- CN
- China
- Prior art keywords
- metallic substance
- ionitrocarburizing
- atmosphere
- iron
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention relates to an ion nitrocarburizing treatment method, in particular to an ion nitrocarburizing treatment method for an iron-based sintered material. In the method, the influence of technological parameters and alloy elements on phase composition of a nitrocarburizing layer as well as the depth and hardness of the nitrocarburizing layer is observed by performing ion nitrocarburizing treatment on iron-based sintered part materials with different chemical compositions. The technological parameters such as nitrocarburizing temperature, time, atmosphere and the like and the addition of the alloy elements such as Mo, Cu and the like into a FeC sintered material apparently affect the depth of the nitrocarburizing layer and improve surface hardness. In the method, the densities of outer surface layers of a positive pressing surface and a lateral pressing surface of a test sample are different due to the characteristic of a pressing process, so that microstructures of the nitrocarburizing layer on the surface of the test sample are different. In the method, only the lateral pressing surface of the test sample is inspected.
Description
Technical field
The present invention relates to a kind of ionitrocarburizing treatment process, particularly a kind of ionitrocarburizing treatment process of iron based material.
Background technology
Contact stress is not really high during for use, but the complicated shape structural parts that needs bite-resistant, abrasion performance, its existing high precision of general requirement (as 8 grades of IT 6～IT) has high rigidity again (as surface hardness 〉=45HRC), when selecting material, iron-based sintered piece material is first-selections of planner because of its manufacture craft characteristics.Yet perplexing one of factor of planner for a long time, is the part deformation problem that conventional thermal treatment causes.
Inquire into the ionitrocarburizing technology that is applicable to that the iron-based sintered structural part is strengthened at present, have the advantages that to improve the class of precision when still keeping finishing after the piece surface hardness, some industrially developed country of Europe are from the test eighties and be applied to industrialization produces.
Because the composition characteristic of iron-based sintered steel structural parts is different from steel, have some holes again, and exist alloying element microcosmic diffusion to a certain extent inhomogeneous even with tissue odds, therefore can not indiscriminately imitate fully the ferrous materials part ionitrocarburizing processing parameter and give treatment process, and processing parameter to the structure property of processed part to influence rule also different.At domestic practical condition, the most frequently used several iron-based sintered piece materials that can both produce general powder metallurgy producer have carried out the test of ionitrocarburizing, have studied the influence to cocementation layer depth and surface hardness of the chemical ingredients, ionitrocarburizing processing parameter of iron-based sintered piece material.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of alloying elements such as Mo, Cu that add in the FeC agglomerated material, obviously influence the ionitrocarburizing treatment process of depth of penetration and raising metal material surface hardness.
For solving the problems of the technologies described above, the ionitrocarburizing treatment process of described iron based material, the surface that this method is handled described metallic substance by the heating of metal material, described surface treatment method comprises:
At first material composition is selected iron-based sintered piece material FeC, FeCCu, FeCCuMo series, adopt the method for two-way compacting to prepare 10mm * 10mm * 10mm pressed compact, through 1120 ℃ of sintering, insulation 1h, the sintering protective atmosphere is a nitrogen-based atmosphere, regulate pressed density so that behind the sintering density of material be 67g/cm3;
The ionitrocarburizing test is carried out in the 10kW ion-nitriding furnace, carbonitriding atmosphere is in 90: 10 nitrogen and hydrogen mixture atmosphere, input acetone C3H6O is to produce carbon-containing atmosphere, its add-on is regulated in 1%～9% scope, treatment temp is 540～640 ℃, soaking time is respectively 1,2,3,5h, handles the back furnace cooling;
Analyze the top layer phase composite with D/max-3B type x x ray diffractometer x, by metallography microscope sem observation diffusion layer organization and measure depth of penetration, with microhardness tester surface measurements hardness, loading is 100g;
Having adopted and having produced double wave colour temperature instrument with Japan is the mode of the main accurate observing and controlling temperature that constitutes, airing system adapted mass flowmeter.
Wherein utilize solvent described aminoresin to be coated the described surface of described metallic substance.
Wherein use melamine resin, urea resin, aniline resin or formaldehyde resin as described aminoresin.
Wherein modification is carried out on the described surface of described metallic substance by forming hardened layer or compound layer on the described surface after the described metallic substance of heating at described metallic substance.
Wherein modification is carried out on the described surface of described metallic substance by forming hardened layer or compound layer on the described surface in the described metallic substance of heating at described metallic substance.
For the accuracy of warranty test data, having adopted and having produced double wave colour temperature instrument with Japan is the mode of the main accurate observing and controlling temperature that constitutes, and airing system adapted mass flowmeter is to eliminate the factor that may cause testing error.
Because the pressing process characteristic causes the positive press face of sample (with the pressed compact face of stamping end face contact) different with the density of side press face (the pressed compact face that contacts with cavity impression) extexine, so that the carbonitriding layer tissue structure of specimen surface is difference to some extent, and the present invention only investigates the side press face of sample.
Embodiment
Iron-based sintered piece material is carried out after ionitrocarburizing handles, and co-penetration layer that its surface obtains is made up of compound layer and diffusion layer.Compound layer by ε phase [Fe2～3 (N, C)] and γ ' mutually (Fe4N) constitute.The phase structure that ε occupies the position, solid matter hexagonal lattice intermediate gap of F e in order for nitrogen-atoms mutually, the phase structure that γ ' occupies the position, face-centered cubic lattice intermediate gap of Fe in order for nitrogen-atoms mutually.Diffusion layer is made up of α phase and nitrogenous compound.For the material of nitrogenate forming element, in diffusion layer, can form the nitride that disperse distributes, for FeC, FeCCu material, in diffusion layer, can form acicular γ ' and separate out mutually.By changing the chemical ingredients and the processing parameter of material, can obtain different phase contents.The phase structure difference of material also shows different toughness and hardness.Study the phase composite and the layer depth of infiltration layer, help the surface microstructure of control material, so that the surface property that acquisition needs.
After handling through 580 ℃, the ionitrocarburizing of insulation 2h, the x ray diffraction facies analysis result of FeC, FeCCu, several composition samples of FeCCuMo.Add Cu in the FeC material, help to increase the content of γ ' phase, this may to have face-centred cubic structure relevant with Cu.
Mo is stronger nitride, carbide forming element, can cause the higher nitrogen of specimen surface, carbon concentration when oozing altogether, thus Mo be added with the ratio that improves the ε phase that is beneficial to.
At 580 ℃ sample is oozed when handling altogether, the N2 in the atmosphere: H2 was fixed as 9: 1, the input of C3H6O steam is transferred to respectively account for 1%～9% of total atmosphere volume fraction, insulation 2h investigates the degree of depth of compound layer.The compound layer of 1#, 2#, three kinds of composition samples of 3# all thickens with the increase of carbon atmosphere, when the C3H6O steam account for the atmosphere total amount 7% the time, all show extremal property, after 7%, the compound layer thickness attenuation.This is because the increase of carbon-containing atmosphere ratio increases the carbon atom infiltration capacity, and the infiltration of carbon can promote that compound layer thickens.When the carbon content in the atmosphere reached higher concentration, the infiltrate journey was initially just infiltrated more carbon atom and has been occupied a large amount of interstitial sites altogether, can hinder the further infiltration of nitrogen, so delayed to make the thicken speed of compound layer in same soaking time.
When carrying out ion carbonitriding, fixing ooze processing parameters such as time, atmosphere composition altogether, observed the temperature variant rule of compound layer in the sample infiltration layer of FeC, FeCCu, three kinds of compositions of FeCCuMo.Compound layer raises with temperature and thickens, and this accelerates relevantly with the permeating speed of N, C atom with the temperature raising, reach maximum value in the time of 600～620 ℃.620 ℃ ooze processing altogether after, the compound layer degree of depth of FeC sample be 23 μ m, FeCCu be 16 μ m; 600 ℃ ooze processing altogether after, the compound layer degree of depth of FeCCuMo sample is 20.5 μ m.Ooze temperature altogether and surpass 600～620 ℃, the compound layer attenuation, this may be that too high temperature has been quickened N, C atom to the material matrix internal divergence, makes it to be difficult in the enrichment of sample top layer, has weakened the ε phase of formation compound layer or the concentration conditions of γ ' phase on the contrary.
Above-mentioned three kinds of irons are carried out ionitrocarburizing when handling, temperature is fixed on 580 ℃, the volume fraction of acetone feeding amount is fixed as 7%, is incubated 1,2,3 respectively, 5h.The depth of penetration of the sintered steel of three kinds of compositions all prolongs with soaking time and increases.The compound layer thickness of relevant fine and close steel is oozed studies show that of time together, and compound layer thickness is the parabolic type rule with holding time prolonging to be increased, and generally compound layer no longer obviously thickens behind insulation 2～3h.But this paper shows the experimental observation result of sintered steel, its compound layer thickness and soaking time almost are linear relationships, this mainly is to have a certain amount of hole in the powdered metal parts material, and these holes have been played the effect of passage in the diffusion process of matrix inside by the surface at nitrogen, carbon atom.Therefore with oozing the processing holding time prolonging altogether, the thickness of compound layer increases.Insulation 5h, the compound layer degree of depth of FeC and FeCCuMo sample can reach 26 μ m, the FeCCu sample is 17.5 μ m.
The carbon atmosphere content to the influence of surface hardness at N2: H2=9: in 1 the nitrogen nitrogen atmosphere, the acetone input of adjusting is carried out carbonitriding in 580 ℃ to FeC, FeCCuMo agglomerated material sample and is handled (insulation 2h).With the increase of carbon potential (strengthening the input of C3H6O), specimen surface hardness improved, and reached maximum value at 7% o'clock, and the surface hardness of FeC sample is 600HV01, the FeCCuMo sample be 760HV01.When carbon atmosphere increased to 9%, hardness reduced.This variation tendency is similar to the changing conditions of compound layer thickness under the same treatment condition.
Form above-mentioned phenomenon and mainly be owing to ooze altogether after carbon atom infiltrates the top layer when handling, at first form the molecule of Fe3C, though its hardness is less than the ε phase, but these particles become the place that helps the mutually non-spontaneous nucleation of ε, therefore with the increase of carbon atmosphere input, the content of ε phase increases, so hardness also increases.After carbon atmosphere input surpasses 7%, the content showed increased of Fe3C, compound layer constitute Fe3C+ ε phase so that cause surface hardness to descend.
When soaking time is fixed as 2h, carbon atmosphere volume fraction is fixed as 7%, under differing temps, FeC, FeCCu, FeCCuMo agglomerated material sample are carried out carbonitriding and handle, wherein the x ray diffraction facies analysis result of FeCCuMo agglomerated material sample under differing temps.The surface hardness of three kinds of materials peak value all occurs at 580 ℃, and FeC is 650HV01, and FeCCu is 640HV01, and FeCCuMo is 770HV01.This is because the sample of 580 ℃ of processing can obtain based on ε mutually and the compound layer of a small amount of γ ' phase arranged.ε phase hardness is greater than γ ' phase, so the high sample hardness of ε phase content is also high.620 ℃ what handle to obtain almost all is γ ' phase, and the surface hardness of this sample obviously reduces.Temperature is brought up to 640 ℃, occurred a spot of ε phase again, therefore on hardness, slightly go up again.
The FeCCuMo sample contains a spot of Mo, and Mo is stronger nitride forming element, and under proper condition, the tiny particle of the MoN of formation can play strengthening effect, so this sample oozes back hardness apparently higher than other two kinds of materials altogether at 580 ℃.Temperature is increased to more than 600 ℃, and MoN decomposes, and loses strengthening effect, causes that surface hardness descends.
Investigated at 580 ℃ and carried out carbonitriding, carbon atmosphere volume fraction was fixed as 7% o'clock, and soaking time is to the influence of material surface hardness.Find insulation 2h, FeCCu can obtain higher surface hardness (640HV01), insulation 3h then three kinds of sintered steels all can obtain the highest surface hardness, FeC is 770HV01, FeCCu is 650HV01, FeCCuMo is 880HV01, and soaking time continues to extend to 5h, and the surface hardness of FeC and FeCCuMo material is reduction trend again.Only in the 5h scope, it is slightly on the rise that hardness is at insulation 2h for the FeCCu material.
Claims (5)
1. the ionitrocarburizing treatment process of an iron based material, the surface that this method is handled described metallic substance by the heating of metal material, described surface treatment method comprises:
At first material composition is selected iron-based sintered piece material FeC, FeCCu, FeCCuMo series, adopt the method for two-way compacting to prepare 10mm * 10mm * 10mm pressed compact, through 1120 ℃ of sintering, insulation 1h, the sintering protective atmosphere is a nitrogen-based atmosphere, regulate pressed density so that behind the sintering density of material be 67g/cm3;
The ionitrocarburizing test is carried out in the 10kW ion-nitriding furnace, carbonitriding atmosphere is in 90: 10 nitrogen and hydrogen mixture atmosphere, input acetone C3H6O is to produce carbon-containing atmosphere, its add-on is regulated in 1%～9% scope, treatment temp is 540～640 ℃, soaking time is respectively 1,2,3,5h, handles the back furnace cooling;
Analyze the top layer phase composite with D/max-3B type x x ray diffractometer x, by metallography microscope sem observation diffusion layer organization and measure depth of penetration, with microhardness tester surface measurements hardness, loading is 100g;
Having adopted and having produced double wave colour temperature instrument with Japan is the mode of the main accurate observing and controlling temperature that constitutes, airing system adapted mass flowmeter.
2. the ionitrocarburizing treatment process of iron based material as claimed in claim 1 wherein utilizes solvent described aminoresin to be coated the described surface of described metallic substance.
3. the ionitrocarburizing treatment process of iron based material as claimed in claim 1 wherein uses melamine resin, urea resin, aniline resin or formaldehyde resin as described aminoresin.
4. the ionitrocarburizing treatment process of iron based material as claimed in claim 1 is wherein carried out modification by forming hardened layer or compound layer on the described surface at described metallic substance after the described metallic substance of heating to the described surface of described metallic substance.
5. the ionitrocarburizing treatment process of iron based material as claimed in claim 1 is wherein carried out modification by forming hardened layer or compound layer on the described surface at described metallic substance in the described metallic substance of heating to the described surface of described metallic substance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102000999A CN102086501A (en) | 2009-12-08 | 2009-12-08 | Ion nitrocarburizing treatment method for iron-based sintered material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102000999A CN102086501A (en) | 2009-12-08 | 2009-12-08 | Ion nitrocarburizing treatment method for iron-based sintered material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102086501A true CN102086501A (en) | 2011-06-08 |
Family
ID=44098504
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102000999A Pending CN102086501A (en) | 2009-12-08 | 2009-12-08 | Ion nitrocarburizing treatment method for iron-based sintered material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102086501A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106350764A (en) * | 2016-11-25 | 2017-01-25 | 大连圣洁热处理科技发展有限公司 | Controllable-atmosphere thin-layer carburizing process |
| CN106544625A (en) * | 2016-11-25 | 2017-03-29 | 大连圣洁热处理科技发展有限公司 | Workpiece carbonitriding technology |
-
2009
- 2009-12-08 CN CN2009102000999A patent/CN102086501A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106350764A (en) * | 2016-11-25 | 2017-01-25 | 大连圣洁热处理科技发展有限公司 | Controllable-atmosphere thin-layer carburizing process |
| CN106544625A (en) * | 2016-11-25 | 2017-03-29 | 大连圣洁热处理科技发展有限公司 | Workpiece carbonitriding technology |
| CN106350764B (en) * | 2016-11-25 | 2018-11-20 | 大连圣洁热处理科技发展有限公司 | Controlled atmosphere thin layer carburizing technique |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2412520C (en) | Method of production of surface densified powder metal components | |
| US7384446B2 (en) | Mixed powder for powder metallurgy | |
| Li et al. | Improvement of corrosion resistance of nitrided low alloy steel by plasma post-oxidation | |
| CN102439189A (en) | High strength low alloyed sintered steel | |
| US8535605B2 (en) | Method of producing a sinter-hardened component | |
| US20230211413A1 (en) | Iron-based sintered alloy material and production method therefor | |
| CN102089452A (en) | Steel for nitrocarburizing and nitrocarburized parts | |
| CN102086501A (en) | Ion nitrocarburizing treatment method for iron-based sintered material | |
| Perrusquia et al. | Duplex surface treatment on microalloy steels by dehydrated paste pack boriding and pack carburizing | |
| Molinari et al. | Plasma nitriding and nitrocarburising of sintered Fe Cr Mo and Fe Cr Mo C alloys | |
| Herranz | Control of carbon content in metal injection molding | |
| Liu et al. | Effects of rare earths in borax salt bath immersion vanadium carbide coating process on steel substrate | |
| Maliska et al. | Microstructural characterization of plasma nitriding surface of sintered steels containing Si | |
| JP4821810B2 (en) | Carburizing heat treatment method and carburizing source material | |
| US20090064819A1 (en) | Fe-based sintered alloy | |
| Manova et al. | Influence of annealing conditions on ion nitriding of martensitic stainless steel | |
| Kazior et al. | Thermochemical treatment of Fe–Cr–Mo alloys | |
| Berg | P/M steel suitable for sinter hardening in respect of cost and performance | |
| Chen et al. | Effect of Mn addition and Its Nitridation on microstructure and properties of sintered Fe-1Mn-0.5 C Low-alloy steel | |
| Scavino et al. | Microprobe Characterization of Nitrocarburized Surface Layers | |
| Dong et al. | A study on carbon concentration distribution and microstructure of P/M materials prepared by carbusintering | |
| Burakowski et al. | Comparison of sliding wear resistance of carburized and nitrided layers on 18HGT steel | |
| Rasid | Innovation Utilization of Nitridation Method in Improving Hardness and Corrosion Resistance of Blacksmiths Crafts | |
| Santuliana | Effect of surface treatments on mechanical properties of low alloy sintered steels | |
| WO2002053793A1 (en) | Duplex process of diffusion forming of hard carbide layers on metallic materials |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| DD01 | Delivery of document by public notice |
Addressee: Shanghai Sino-Carbide Co., Ltd. Document name: Notification that Application Deemed to be Withdrawn |
|
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110608 |