WO2002006546A1 - Segment de piston presentant une resistance elevee a l'erosion, a la fissuration et a la fatigue, procede permettant de produire ce segment et combinaison segment de piston et bloc-cylindres - Google Patents
Segment de piston presentant une resistance elevee a l'erosion, a la fissuration et a la fatigue, procede permettant de produire ce segment et combinaison segment de piston et bloc-cylindres Download PDFInfo
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- WO2002006546A1 WO2002006546A1 PCT/JP2001/006127 JP0106127W WO0206546A1 WO 2002006546 A1 WO2002006546 A1 WO 2002006546A1 JP 0106127 W JP0106127 W JP 0106127W WO 0206546 A1 WO0206546 A1 WO 0206546A1
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- ring
- less
- steel
- stainless steel
- resistance
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- 238000005336 cracking Methods 0.000 title claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000011651 chromium Substances 0.000 claims abstract description 43
- 150000004767 nitrides Chemical class 0.000 claims abstract description 33
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 20
- 239000002245 particle Substances 0.000 claims abstract description 19
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 14
- 239000010935 stainless steel Substances 0.000 claims abstract description 13
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 10
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 9
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 8
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 8
- 239000012535 impurity Substances 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 4
- 238000010791 quenching Methods 0.000 claims description 35
- 229910000831 Steel Inorganic materials 0.000 claims description 34
- 239000010959 steel Substances 0.000 claims description 34
- 230000000171 quenching effect Effects 0.000 claims description 30
- 150000001875 compounds Chemical class 0.000 claims description 19
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 16
- 229910000734 martensite Inorganic materials 0.000 claims description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 238000006748 scratching Methods 0.000 claims description 8
- FFGPTBGBLSHEPO-UHFFFAOYSA-N carbamazepine Chemical compound C1=CC2=CC=CC=C2N(C(=O)N)C2=CC=CC=C21 FFGPTBGBLSHEPO-UHFFFAOYSA-N 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 238000005452 bending Methods 0.000 claims description 2
- 241001634822 Biston Species 0.000 claims 1
- 230000002929 anti-fatigue Effects 0.000 claims 1
- 229910001105 martensitic stainless steel Inorganic materials 0.000 abstract description 11
- 239000000203 mixture Substances 0.000 abstract description 8
- 239000000126 substance Substances 0.000 abstract description 4
- 239000010410 layer Substances 0.000 description 39
- 230000000052 comparative effect Effects 0.000 description 31
- 238000005121 nitriding Methods 0.000 description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 23
- 238000012360 testing method Methods 0.000 description 15
- 239000000463 material Substances 0.000 description 11
- 150000001247 metal acetylides Chemical class 0.000 description 11
- 229910052742 iron Inorganic materials 0.000 description 10
- 238000002485 combustion reaction Methods 0.000 description 9
- 239000003921 oil Substances 0.000 description 9
- 238000005496 tempering Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 239000011159 matrix material Substances 0.000 description 8
- 230000007246 mechanism Effects 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000005496 eutectics Effects 0.000 description 6
- 229910002804 graphite Inorganic materials 0.000 description 6
- 239000010439 graphite Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 239000006104 solid solution Substances 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- VLHWNGXLXZPNOO-UHFFFAOYSA-N 2-[4-[2-(2,3-dihydro-1H-inden-2-ylamino)pyrimidin-5-yl]-3-(2-morpholin-4-ylethyl)pyrazol-1-yl]-1-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethanone Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C=1C(=NN(C=1)CC(=O)N1CC2=C(CC1)NN=N2)CCN1CCOCC1 VLHWNGXLXZPNOO-UHFFFAOYSA-N 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 238000000227 grinding Methods 0.000 description 4
- 238000005098 hot rolling Methods 0.000 description 4
- 239000010687 lubricating oil Substances 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- JAWMENYCRQKKJY-UHFFFAOYSA-N [3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-ylmethyl)-1-oxa-2,8-diazaspiro[4.5]dec-2-en-8-yl]-[2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidin-5-yl]methanone Chemical compound N1N=NC=2CN(CCC=21)CC1=NOC2(C1)CCN(CC2)C(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F JAWMENYCRQKKJY-UHFFFAOYSA-N 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 3
- 238000000137 annealing Methods 0.000 description 3
- 229910001566 austenite Inorganic materials 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 238000004381 surface treatment Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000010622 cold drawing Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 238000000879 optical micrograph Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000010587 phase diagram Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000011002 quantification Methods 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 230000003746 surface roughness Effects 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- -1 C: 0.80-0.95% Substances 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910000669 Chrome steel Inorganic materials 0.000 description 1
- 229910001035 Soft ferrite Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical group [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- DYRBFMPPJATHRF-UHFFFAOYSA-N chromium silicon Chemical compound [Si].[Cr] DYRBFMPPJATHRF-UHFFFAOYSA-N 0.000 description 1
- QKJXFFMKZPQALO-UHFFFAOYSA-N chromium;iron;methane;silicon Chemical compound C.[Si].[Cr].[Fe] QKJXFFMKZPQALO-UHFFFAOYSA-N 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000009661 fatigue test Methods 0.000 description 1
- 210000003608 fece Anatomy 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000010871 livestock manure Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/40—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for rings; for bearing races
-
- 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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
-
- 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
-
- 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
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
Definitions
- the present invention relates to a bis-ring used in an internal combustion engine, and particularly to a scuffing resistance (seizure resistance), a cracking resistance (breakage resistance) and a fatigue resistance.
- the present invention relates to an excellent high chrome martensitic stainless steel-made bis-nitride ring and a method for producing the same. Background art
- steel materials for piston rings are broadly classified into carbon steel, silicon chrome steel, and martensitic stainless steel. Chromium is applied to steel and silicon chromium steel, while gas nitriding is applied to martensite stainless steel. In conventional steel piston rings, chrome plating was almost the only force applied.S, problems with scuffing of the plating layer under high load, and wastewater treatment Due to environmental issues, bis-nitride rings have become the mainstream in recent years.
- JIS SUS440B equivalent material is the main steel type used for bis-nitride ring.
- nitrogen atoms penetrate into the steel from the surface and diffuse to form a nitrided layer.
- the nitride in the nitride layer is mainly a compound with Cr, V, and Mo, or a compound thereof with Fe as a solid solution.
- Cr which is contained abundantly in steel, dissolves in the matrix and exists as Cr carbide.However, it has a greater affinity for nitrogen than carbon, so it can be used for nitriding. Nitrogen diffused from the surface and the Cr carbide react to form Cr nitride. Since SUS440B has a high Cr content of 17.0-18.0%, a relatively hard nitrided layer in which hard Cr nitrides are dispersed at an appropriate area ratio is obtained for the above-mentioned reasons, and excellent wear resistance is obtained. Shows resistance and anti-scratching properties.
- Japanese Patent Application Laid-Open No. H11-80907 discloses that although Cr is slightly lower than 5.0 and less than 12.0%, Si: 0.25% and Mn: Excellent by containing 0.30% or less, one or more of Mo, W, V, Nb: 0.3-2.5%, or Cu: 4.0% or less, Ni: 2.0% or less, ⁇ : 1.5% or less and this the anti ska Zuph fin grayed resistance is obtained, by the this to the Japanese Patent Laid-Open No. 11-106874, to 4.0% and the content of M 7 C 3 type carbide that exists in the tissue area% It is disclosed that a bistable ring material having excellent workability in addition to squatting resistance can be obtained.
- This scattering is often caused by the occurrence of a crack perpendicular to the sliding direction of the outer periphery of the piston ring. It is observed along a relatively coarse layered grain boundary compound (also referred to by those skilled in the art as a seagull phase) which is almost parallel to the surface formed at the crystal grain boundary of the nitride layer on the ring sliding surface. .
- the purpose of the present invention is to use an internal combustion engine with a high rotation speed and a high combustion pressure and a high load, especially a diesel engine employing a lightweight steel monoblock that is expected to increase in the future.
- Bi-stone ring made of high chrome martensitic stainless steel, which does not cause abrasion, scuffing, cracking, and fatigue breakage, and has excellent cost performance. Its purpose is to provide a manufacturing method thereof. Disclosure of the invention
- the structure of the nitrided layer in the high chrome martensite stainless steel is generally tempered and has a form in which hard nitrides are mainly dispersed in the matrix of the martensite. Scuffing is based on its mechanical force, microscopic irregularities on the sliding surface, that is, the size of the hard particles dispersed in the relatively soft matrix. Strongly related to dispersion. When observing the cross section of the surface layer having such a structure, the convex hard particles come into contact with the sliding surface of the mating member, and the relatively soft matrix becomes relatively concave. I have.
- the probability of the nitrided steel coming into direct contact with the counterpart material is reduced, and a lubricating oil film is formed in the recess, and pressure is generated in the oil film during sliding, thereby reducing the contact pressure.
- the lubrication of the convex contact portion can be prevented to prevent the occurrence of scuffing.
- a particle size of submicron to several micron size is required, and the dispersion amount is 5% in area ratio. % Is desirable. If the hard particles are extremely small or the amount of dispersion is small, the mechanism due to the effect of the convex hard particles cannot be expected.
- This anti-scratch mechanism depends on the condition of the sliding surface of the mating material.
- the surface roughness of the entire surface of the cylinder is likely to be roughened by grinding, and the plastic flow of the ferrite phase Is often blocked by graphite.
- Such iron is also suitable for sliding It is also “familiar” among traders. )
- hard particles composed of Cr nitride as the main part of the nitrided layer are dispersed in an appropriate size and uniformity, and a large number of particles are dispersed. This reduces the contact probability between the matrix and the cylinder, and in particular reduces the size of the grain boundary compounds generated by the nitriding treatment to reduce the
- the present inventors have found that it is indispensable to suppress the generation of cracks and to prevent the spread of cracks even if they occur.
- eutectic Cr carbide phase: (Cr, Fe) 7 C 3
- ⁇ phase primary austenite
- Cr carbides with a maximum diameter exceeding 20 ⁇ are observed.
- the refinement of this coarse primary eutectic carbide is achieved by adding at least 0.25% of nitrogen (N) to iron and steel, Vol. 82, No. 4, pp. 309-314 (1996).
- Japanese Patent Application Laid-Open Nos. 9-289053 and 9-287058 disclose rolling bearings utilizing the technique of refining Cr carbide by adding N.
- the present inventors have considered the mechanism of the above-mentioned scuffing, and found that the crack formed on the surface formed at the crystal grain boundary of the nitrided layer on the piston ring sliding surface is observed.
- microstructure such that the layered grain boundary compound in the inside becomes fine, high-speed, high-output, high-combustion-pressure internal combustion engines, especially recent lightweight steel monobloc diesel engines Even when used in such applications as high-chromium martensitic stainless steel bis-nitride rings, which are excellent in wear resistance, scuffing resistance, cracking resistance, and fatigue resistance. What you can get And found.
- the nitrided piston ring made of high chrome martensitic stainless steel according to the present invention has a weight of 0 / chrome martensitic stainless steel.
- C 0.3-1.0%, Cr: 14.0-21.0%, N: 0.05-0.50%, Mo-, V-, W-, Nb-0.03-3.0%, total of at least one or more types, Si: 0.1-1.0 %, Mn: 0.1-1.0%, P: 0.05% or less, S: 0.05% or less, with the balance Fe and Hard particles of nitrides, carbides, and carbonitrides mainly consisting of nitrides on the surface of the sliding nitride layer consist of unavoidable impurities and have an average diameter of 0.5-2 m and a maximum diameter of 7 mm.
- the nitrided sliding surface having the above-mentioned structural characteristics is such that the Vickers hardness is in the range of 900-1400, and the depth of the nitrided layer is sufficient from the surface subjected to the nitriding treatment. It is characterized by having a thickness.
- a steel having a predetermined composition is melted, nitrogen is added, and the ingot is manufactured. Then, hot rolling, annealing, cold drawing, and cold rolling are performed to approximate the predetermined cross section of the steel ring, and quenching and tempering are performed to obtain a wire.
- the wire is bent into a ring shape and subjected to strain relief heat treatment, side surface rough grinding, nitriding, removal of the surface compound layer, grinding between the abutment, side finish grinding, outer wrapping, etc.
- C forms a solid solution in Fe to increase the hardness of the matrix, It easily combines with Cr, Mo, V, W, and Nb to form carbides.
- Carbides by connexion nitride layer during nitriding treatment changes to nitride as a main, improving the wear resistance and ska Tsu off I ring of the sliding surface of the bis tons Li in g c
- the term “heat loss” refers to a phenomenon in which the sealing property deteriorates due to a decrease in tension due to the cleaving phenomenon during use of the biston ring at a high temperature.
- it reacts with C in steel to form Cr carbide.
- This Cr carbide easily reacts with N invading from the surface by nitriding, and becomes CrN in the nitrided layer and is dispersed as hard particles. These hard particles in the nitrided layer significantly improve the wear resistance and scuffing resistance of the piston ring sliding surface.
- the Cr content is less than 14%, the formation of Oehic compounds is small, and if it exceeds 21%, the toughness is reduced due to the formation of ⁇ ferrite and the Cr concentration in the matrix becomes too high. Since the Ms (martensite transformation start temperature) may be lowered and sufficient quenching hardness may not be obtained, the Cr content should be in the range of 14-21%. Preferably it is in the range of 16-19%.
- N forms an interstitial solid solution with Fe as does C. Due to the addition of N, for example, the C concentration at the left end of the eutectic line in the 17% Cr isoconcentration cross section of the Fe-Cr-C phase diagram changes the C concentration of the Shifting to a higher concentration side suppresses the eutectic reaction, thereby suppressing the crystallization of the ⁇ phase. C subsequent supersaturated during cooling, New precipitates around as a lame error like M 23 C 6 and Micromax 2 New precipitates primary crystal ⁇ grain boundaries.
- New is out ⁇ phase crystallizes is less than 0.05%, and if it exceeds 0.50% increases the amount of precipitation of Micromax 2 New rod-shaped, since the toughness is lowered, New is in the range of 0.05-0.50%. It is preferably in the range of 0.10-0.30%. Further, the solid solution of ⁇ to Conclusions click scan during inhibit the diffusion of C in the Conclusions click scan, the grain boundary compounds (eventually changed to Fe 3 N Fe 3 C It also contributes to the miniaturization of). If the addition of N is 0.2% or less, it can be added at normal pressure, and if it exceeds 0.2%, melting in a pressurized] ⁇ 2 atmosphere is required. Yo Therefore, from the viewpoint of the N addition force Q, the range of 0.05 to 0.20% is preferable.
- Mo, V, W, and Nb are all carbide-forming elements that improve wear resistance and anti-scratching properties.
- Mo has an effect of preventing softening during tempering and nitriding, and plays an important role in the dimensional stability of the bis-ring.
- V is an element that promotes nitriding and has the effect of increasing the hardness of the nitrided layer.
- any of the elements is useful because it improves various performances required for piston ring, but if the total of at least one of Mo, V, W, and Nb is less than 0.03%, The effect is negligible, and if it exceeds 3%, the workability is significantly impaired and the toughness is reduced, so that the total of at least one of Mo, V, W and Nb is 0.03-3.0 % Range.
- Si is added as a deoxidizing agent, and forms a solid solution in Fe to increase temper softening resistance and improve so-called heat resistance. If it is less than 0.1%, the effect is small. If it exceeds 1.0%, the toughness is reduced. Therefore, the Si content is in the range of 0.1 to 1.0%.
- Mn is also added as a deoxidizing agent like Si. If the content is less than 0.1%, the effect is small, and if it exceeds 1.0%, the workability is reduced. Therefore, Mn is set in the range of 0.1 to 1.0%.
- the content is set to 0.05% or less. Preferably, it is 0.03% or less.
- the content is set to 0.05% or less. Preferably, it is 0.03% or less.
- the nitride in the nitrided layer is fine and numerous.
- the main surface of the sliding nitride layer is C r
- Hard particles of nitrides, carbides and carbonitrides consisting of the following nitrides should be in the range of 0.2-2 // m in average diameter, 7 xm or less in maximum diameter, and 5-30% in area ratio.
- the average particle size is less than 0.2 m, the effect as a convex hard particle for preventing scuffing cannot be expected, and when it exceeds 2 / _tm, the problem of scuffing when the load is high is high. Remains.
- the maximum diameter exceeds 7 m, the uniformity of the tissue is poor, and in the case of a high load, the problem of scuffing remains.
- the area ratio is less than 5%, there remains a problem in anti-scratching resistance, and if it exceeds 30%, it becomes difficult to process the wire after melting or to bend the wire into a ring shape.
- it is 10-25%.
- the nitrided layer cross-section in the longitudinal direction of the bis-ring which is substantially composed of matrix and hard particles.
- the size (length) of the grain boundary compound to be used is 20 / m or less at maximum. Exceeding the maximum length of 20 causes problems with cracking under heavy loads.
- the nitride layer structure of the present invention as described above is caused by the microstructure of stainless steel.
- the ⁇ phase ((Cr, Fe) 7 C 3 ) does not exist. This can be achieved by adding nitrogen.
- the second, secondary carbides (epsilon phase: (Fe, Cr) 23 C e) precipitated when kept at the quenching temperature prior to nitriding treatment there are many fine.
- the quenching temperature As the temperature is lower, more carbides precipitate in an equilibrium manner, so the ( ⁇ + ⁇ ) region
- quenching temperature As the temperature is lower, more carbides precipitate in an equilibrium manner, so the ( ⁇ + ⁇ ) region
- quenching temperature As the temperature is lower, more carbides precipitate in an equilibrium manner, so the ( ⁇ + ⁇ ) region
- quenching temperature As low as possible, it is possible to precipitate as many f carbides as possible.
- quenching from a low temperature range makes the crystal grains fine in order to suppress the growth of ⁇ crystal grains, and thus makes it possible to make the grain boundary compound phase formed in the subsequent nitriding treatment also fine.
- the preferred quenching temperature is in the range of 850-1000 ° C. Below 850 ° C, Prescribed hardness cannot be obtained due to lack of cracking and precipitation of ⁇ phase.At quenching temperatures exceeding 1000 ° C, coagulation of carbides and coarsening of ⁇ grains occur at the stage where quenching temperature is maintained. As a result, nitrides and grain boundary compound phases formed in the subsequent nitriding process are coarsened. The high hardness of 900-1400 can be obtained to a sufficient depth in a relatively short time in the nitrided layer.However, the relatively small quenching temperature allows relatively fine ⁇ grains to be obtained.
- the reason for performing the nitriding treatment in the range of 450 to 600 ° C has been considered to be that the solubility of N in the -Fe lattice becomes maximum at about 590 ° C, It is not necessary to limit to this temperature if the grain boundary is the main diffusion path of N.
- arbitrary processing at low as Ru can temperature preferred is 1 in a range of practical point of view from 450- 600 D C - it was 20 hours.
- FIG. 1 is a backscattered electron image photograph of the sliding nitride layer surface by a scanning electron microscope.
- FIG. 1 (a) corresponds to Example 1 and
- FIG. 2 (b) corresponds to Comparative Example 1.
- FIG. 2 is an optical micrograph of a cross section of the nitride layer.
- FIG. 2 (a) corresponds to Example 1 and
- FIG. 2 (b) corresponds to Comparative Example 1.
- FIG. 3 is a diagram showing a test piece for a scuffing test.
- FIG. 4 is a view showing an operation mechanism of the friction and wear tester.
- Fig. 5 is a diagram showing the operation mechanism of the Biston ring fatigue tester.
- Figure 6 is a graph of the fatigue limit diagram.
- FIG. 7 is a photograph of a crack formed on the sliding surface of Comparative Example 13. BEST MODE FOR CARRYING OUT THE INVENTION
- Example 1-11 Jl-Jll
- Comparative Example 1-8 H1-H8
- High chrome martensite stainless steel with the chemical composition shown in Table 1 was melted using a 10 kg vacuum induction melting furnace. However, steel with less than 0.2% N was added with nitrogen at normal pressure, and steel with 0.2% or more was melted in a pressure 2 atmosphere. Next, it is made into a linear material with a diameter of 12 mm through hot working, and after pickling, subjected to spheroidizing annealing at 750 ° C for 10 hours.After a predetermined process, a rectangular cross section of 3.5 mm X 5.0 mm is formed. It was processed into a wire rod.
- quenching and tempering are performed in a quenching furnace (Ar atmosphere) at 930 ° C for about 10 minutes, and after air-cooled quenching, they pass through a tempering furnace (Ar atmosphere) at 620 ° C for about 25 minutes.
- the test was performed in a continuous manner, and nitriding was performed on a test piece obtained by cutting a wire into a length of 50 mm, and gas nitriding was performed at 570 ° C for 4 hours.
- the quenching temperature of Comparative Example 1 (HI) was performed at iioo ° c, which was conventionally performed conventionally. Other conditions are the same as those of the other examples and comparative examples.
- FIG. 1 and Fig. 2 show the backscattered electron images (Figs. 1 (a) and (b)) of the sliding nitride layer surface of Example 1 (J1) and Comparative Example 1 (HI) by a scanning electron microscope.
- Optical micrographs (FIGS. 2A and 2B) of the cross section of the layer are shown. The hard particles are black in the backscattered electron image and white in the light micrograph.
- the size of the hard particles is small, and the size of the grain boundary compound in the cross section of the nitride layer is also extremely small.
- Table 2 shows the results of quantification of the structures of Example 1-11 (J1-J11) and Comparative Example 1-8 (H1-H8). , The area ratio, the maximum length of the grain boundary compound in the cross section of the nitrided layer, and the hardness of the sliding surface of the nitrided layer are shown.
- the scuffing test is a U-shaped 2-pin integrated test piece with a total length of 45 mm as shown in Fig. 3 made from a wire test piece.
- the test was performed using a friction and wear tester (manufactured by RIKEN: trade name "Tribolic 1").
- the sliding surface at the tip of the pin (Fig. 4, reference numeral 1) has a convex shape with a radius of 20mm and grinds a 5-20 ⁇ m thick compound layer (white layer) formed on the surface by gas nitriding. Removed and polished to a mirror finish.
- the FC250 disk (Fig. 4, reference numeral 2) was prepared by adjusting the surface roughness (Rz) of the sliding surface to 1-2 m.
- Fig. 4 shows the operating mechanism of the friction and wear tester, and the fuzzing test conditions are shown below.
- Pressing load Increase from the initial l.OMPa every 0.2MPa, pressure increase until scatting occurs
- Lubricating oil Motor oil (Product name, Nippon Oil Motor Oil P # 20) Lubricating oil temperature: 80 ° C (near the outlet)
- the squashing surface pressure was calculated from the load applied when squashing occurred and the wear area of the sliding surface.
- Table 3 shows the scuffing surface pressure of Example 1-11 (J1-J11) and Comparative Example 1-8 (H1-H8).
- Example 1-11 J1-J11 according to the present invention was found to have improved anti-scuffing properties as compared with Comparative Examples 1, 3, and 5-7 (HI, H3, H5-H7). I understand.
- Comparative Example 9 H9
- the hardness of the nitrided layer was a low value of 860.
- Example 1 In the material having the chemical composition of Example 1, a nitrided layer structure obtained by air-quenching quenching from the quenching temperature shown in Table 7 in the quenching process after wire rod processing and performing gas nitriding through the same predetermined process as in Example 1 Quantified. Table 5 shows the results.
- a pressure ring with a rectangular cross section of nominal diameter (95.0 mm), thickness (a,) 3.35 mm, width (h,) 2.3 ram (implemented Example 15 and Comparative Example 12).
- quenching and tempering are performed in a continuous manner by passing through a quenching furnace at 930 ° C for about 10 minutes, air-quenching and then passing through a tempering furnace at 620 ° C for about 25 minutes. , 570 ° C For 4 hours.
- the quenching temperature of Comparative Example 12 was performed at 1100 ° C., which was conventionally performed conventionally. Other conditions are the same as in Example 15.
- a fatigue test was carried out using the fabricated pressure ring with a piston ring fatigue tester having the operating mechanism shown in Fig. 5.
- the product 3 with the free opening dimension expanded by cutting both ends of the opening is set on the testing machine with the ring closed to the nominal diameter, and the direction of further closing from this state
- the eccentric cam 4 repeats the stroke corresponding to the applied stress at a cycle of 40 cycles / second, causing the ring to break.
- the number of loads was determined. This test was repeated for samples of the same specifications while changing the load stress, so-called SN diagrams were created, and finally fatigue limit diagrams were obtained.
- FIG. 6 shows a fatigue limit diagram. It can be seen that the fatigue limit is significantly improved in Example 15 of the present invention as compared with Comparative Example 12.
- Example 1 From the steel materials of Example 1 (Examples 16 and 17), Example 7 (Examples 18 and 19), and Comparative Example 1 (Comparative Examples 13 and 14), through a predetermined process, a nominal diameter of 99.2 mm and a thickness of 99.2 mm (A,) 3.8mm, width (h,) 2.5mm rectangular section pressure ring (Examples 16, 18 and Comparative Example 13), nominal diameter (d,) 99.2mm, thickness (a,)
- the two-piece oil bearing body with a saddle-shaped cross section of 2.5 mm and width (h,) 3.0 mm ('Examples 17, 19, Comparative Example 14) was machined.
- the heat treatment of quenching and tempering and the gas nitriding were performed in the same manner as in Example 15 in Examples 16 to 19 and in Comparative Example 12 in Comparative Examples 13 to 14.
- the manufactured pressure ring and oil ring were subjected to a 100-hour durability test under the following conditions using a 4-cylinder 3200 cc ferromagnetic monobloc nozzle diesel engine.
- the bismuth ring made of high chromium martensite stainless steel according to the present invention is based on the technology of refining Cr carbide by adding nitrogen and the relatively low temperature. Due to the quenching, many nitrides in the nitrided layer are fine and numerous, and especially the layered grain boundary compounds in the nitrided layer have a fine microstructure, and are resistant to wear and scuffing. Because of its excellent resistance, cracking resistance and fatigue resistance, it can be used for high-speed, high-power, high-load internal combustion engines, especially recent lightweight rust-resistant monolithic diesel engines. Is possible. It can also be used effectively against fatigue of the bis-rings when using exhaust brakes on small trucks. Applicable screw rings can be conveniently used in pressure ring as well as 2-piece oil ring main bodies and 3-piece oil ring rails.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01949987A EP1304393B1 (en) | 2000-07-17 | 2001-07-16 | Piston ring excellent in resistance to scuffing, cracking and fatigue and method for producing the same, and combination of piston ring and cylinder block |
DE60122164T DE60122164T2 (de) | 2000-07-17 | 2001-07-16 | Kolbenring mit ausgezeichneter beständigkeit gegen reibung, rissbildung und ermüdung und herstellungsverfahren dafür und kombination von kolbenriing und zylinderblock |
KR10-2003-7000751A KR100507424B1 (ko) | 2000-07-17 | 2001-07-16 | 내스커핑성, 내크래킹성 및 내피로성이 우수한 피스톤 링및 그 제조방법 그리고 피스톤 링과 실린더 블록의 조합 |
US10/333,326 US20040040631A1 (en) | 2000-07-17 | 2001-07-16 | Piston ring excellent in resistance to scuffing, cracking and fatigue and method for producing the same, and combination of piston ring and cylinder block |
BRPI0112573-7A BR0112573B1 (pt) | 2000-07-17 | 2001-07-16 | anel de pistço. |
US11/657,015 US20070187002A1 (en) | 2000-07-17 | 2007-01-24 | Piston ring having improved scuffing, cracking and fatigue resistances, and its production method, as well as combination of piston ring and cylinder block |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000216255A JP4724275B2 (ja) | 2000-07-17 | 2000-07-17 | 耐スカッフィング性、耐クラッキング性及び耐疲労性に優れたピストンリング及びその製造方法 |
JP2000-216255 | 2000-07-17 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/657,015 Continuation US20070187002A1 (en) | 2000-07-17 | 2007-01-24 | Piston ring having improved scuffing, cracking and fatigue resistances, and its production method, as well as combination of piston ring and cylinder block |
Publications (1)
Publication Number | Publication Date |
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WO2002006546A1 true WO2002006546A1 (fr) | 2002-01-24 |
Family
ID=18711547
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/006127 WO2002006546A1 (fr) | 2000-07-17 | 2001-07-16 | Segment de piston presentant une resistance elevee a l'erosion, a la fissuration et a la fatigue, procede permettant de produire ce segment et combinaison segment de piston et bloc-cylindres |
Country Status (10)
Country | Link |
---|---|
US (2) | US20040040631A1 (ja) |
EP (1) | EP1304393B1 (ja) |
JP (1) | JP4724275B2 (ja) |
KR (1) | KR100507424B1 (ja) |
CN (1) | CN1210427C (ja) |
AR (1) | AR029730A1 (ja) |
BR (1) | BR0112573B1 (ja) |
DE (1) | DE60122164T2 (ja) |
TW (1) | TW521093B (ja) |
WO (1) | WO2002006546A1 (ja) |
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- 2001-07-16 DE DE60122164T patent/DE60122164T2/de not_active Expired - Lifetime
- 2001-07-16 EP EP01949987A patent/EP1304393B1/en not_active Expired - Lifetime
- 2001-07-16 US US10/333,326 patent/US20040040631A1/en not_active Abandoned
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2295777A1 (en) * | 2003-03-31 | 2011-03-16 | Hitachi Metals, Ltd. | Internal engine piston and its production method |
CN103866202A (zh) * | 2012-12-14 | 2014-06-18 | 钟庆辉 | 采用改性不锈钢材料制作发动机活塞环气环方法 |
Also Published As
Publication number | Publication date |
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US20040040631A1 (en) | 2004-03-04 |
DE60122164T2 (de) | 2007-10-11 |
BR0112573B1 (pt) | 2009-01-13 |
US20070187002A1 (en) | 2007-08-16 |
JP2002030394A (ja) | 2002-01-31 |
AR029730A1 (es) | 2003-07-10 |
EP1304393A1 (en) | 2003-04-23 |
BR0112573A (pt) | 2003-07-01 |
EP1304393B1 (en) | 2006-08-09 |
EP1304393A4 (en) | 2005-08-03 |
TW521093B (en) | 2003-02-21 |
KR100507424B1 (ko) | 2005-08-10 |
CN1210427C (zh) | 2005-07-13 |
DE60122164D1 (de) | 2006-09-21 |
JP4724275B2 (ja) | 2011-07-13 |
KR20030025275A (ko) | 2003-03-28 |
CN1458983A (zh) | 2003-11-26 |
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