WO2015129612A1 - 可動壁部材および溶接方法 - Google Patents
可動壁部材および溶接方法 Download PDFInfo
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- WO2015129612A1 WO2015129612A1 PCT/JP2015/054984 JP2015054984W WO2015129612A1 WO 2015129612 A1 WO2015129612 A1 WO 2015129612A1 JP 2015054984 W JP2015054984 W JP 2015054984W WO 2015129612 A1 WO2015129612 A1 WO 2015129612A1
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- layer
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- corrosion resistant
- welding
- wall member
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/02—Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/3066—Fe as the principal constituent with Ni as next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
- B23K35/3053—Fe as the principal constituent
- B23K35/308—Fe as the principal constituent with Cr as next major constituent
- B23K35/3086—Fe as the principal constituent with Cr as next major constituent containing Ni or Mn
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/24—Selection of soldering or welding materials proper
- B23K35/32—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
- B23K9/044—Built-up welding on three-dimensional surfaces
- B23K9/046—Built-up welding on three-dimensional surfaces on surfaces of revolution
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C19/00—Alloys based on nickel or cobalt
- C22C19/03—Alloys based on nickel or cobalt based on nickel
- C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
- C22C19/058—Alloys based on nickel or cobalt based on nickel with chromium without Mo and W
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/06—Alloys based on 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
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/02—Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials
- F01L3/04—Coated valve members or valve-seats
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/10—Pistons having surface coverings
- F02F3/12—Pistons having surface coverings on piston heads
Definitions
- the present invention relates to a movable wall member used in an internal combustion engine and a welding method.
- the movable wall member used in the internal combustion engine is formed of heat resistant steel.
- a layer made of a corrosion resistant material is provided on the surface of the movable wall member in order to prevent high temperature corrosion (Patent Document 1 and Patent Document 2).
- material components that exhibit corrosion resistance include chromium (Cr) and molybdenum (Mo).
- Patent No. 5036879 (Paragraph [0030], FIG. 1) Registered utility model No. 3038802 (paragraph [0004])
- the component contained in a corrosion-resistant material forms carbon and carbide which are contained in heat-resistant steel by providing a buffer layer between a heat-resistant steel (alloy steel) and a layer (outer part) which consists of corrosion-resistant materials. To prevent that.
- Patent Document 1 while limiting the carbon content of the alloy steel (base material) and the buffer layer, it is necessary to define the thickness of the buffer layer. Therefore, there is a problem that the materials of the base material and the buffer layer can not be selected freely.
- Patent Document 2 a layer made of a corrosion resistant material is directly formed by welding on a base material.
- the material whose Cr content is remarkably high is used as a corrosion-resistant material, the corrosion-resistant material with high Cr content has the subject that ductility is low and it is difficult to weld.
- the present invention has been made in view of such circumstances, and provides a movable wall member and a welding method provided with a tactile surface having expected corrosion resistance while expanding the selection range of the material of the buffer layer. With the goal.
- the movable wall member and welding method of the present invention adopt the following means.
- the present invention is a movable wall member used in an internal combustion engine, and has a corrosion resistant layer whose outermost surface becomes a contact surface on a base material, and the corrosion resistant layer comprises 50 mass% or more and 60 mass% or less of Ni, Cr40.
- the corrosion resistant layer is formed using an alloy containing 50 mass% to 60 mass% of Ni and 40 mass% to 50 mass% of Cr (hereinafter referred to as 50Cr-50Ni alloy).
- 50Cr-50Ni alloy an alloy containing 50 mass% to 60 mass% of Ni and 40 mass% to 50 mass% of Cr
- the corrosion resistant layer is built up in multiple layers, the dilution of Cr in the alloy can be reduced stepwise. That is, when the corrosion resistant layer is formed using the same type of 50Cr-50Ni alloy, the Cr content of the layer on the side of the base material is lower than that of the 50Cr-50Ni alloy, but the layer including the outermost surface which becomes the contact surface Is able to ensure the Cr content equivalent to the alloy component. Therefore, it becomes a movable wall member which has corrosion resistance expected.
- the present invention can form the outermost layer which becomes the contact surface without being affected by the base material, even if another layer is provided between the base material and the corrosion resistant layer, the material of the other layer is provided. Is not as limited as in Patent Document 1. Therefore, the operator can freely select inexpensive materials or materials having good availability.
- the layer provided with the outermost surface preferably contains 40% by mass or more and 50% by mass or less of Cr.
- the present invention is a welding method in which an alloy containing 50% by mass to 60% by mass of Ni and 40% by mass to 50% by mass of Cr is subjected to layer welding in layers after the base material is preheated to 80 ° C. to 120 ° C. And provide a welding method in which the temperature between passes when forming the layer is 200 ° C. or less.
- Preheating can prevent a rapid temperature change of the lower layer (including the base material).
- the upper limit of the interpass temperature it is possible to suppress the temperature rise of the molten pool. Thereby, high temperature cracks can be prevented.
- each layer is not subjected to the surface facing, but according to one aspect of the above-mentioned invention, corrosion resistance is less likely to occur by forming the next layer after the surface facing. It can be a layer.
- the present invention provides a movable wall member provided with a tactile surface having the expected corrosion resistance by forming the corrosion resistant layer in a multilayer structure.
- the material selection of the layer provided under the corrosion resistant layer becomes wider than before.
- FIG. 3 is a partial cross-sectional view of a side of the exhaust gas in FIG.
- FIG. 3 is a partial cross-sectional view of a side of the exhaust gas in FIG.
- It is a flowchart which shows the procedure at the time of forming the 1st overlaying layer of a corrosion resistant layer. It is a figure explaining bead formation. It is a figure explaining bead formation. It is a fragmentary sectional view of a movable wall member concerning an example of an experiment. It is a front view of the exhaust valve concerning a 2nd embodiment.
- FIG. 1 is a perspective view showing an essential part of a ship engine.
- the engine includes a cylinder 1, a piston 2 slidably fitted in the cylinder, an exhaust pipe 3 coupled to an upper portion of the cylinder, and an exhaust valve 4 inserted into the exhaust pipe 3. ing.
- a space surrounded by the cylinder 1, the exhaust valve 4 and the piston 2 is a combustion chamber 5.
- the engine includes a fuel supply unit capable of supplying fuel to the combustion chamber 5 and an air supply unit capable of supplying air to the combustion chamber 5.
- the present invention can be applied to the exhaust valve 4 or the piston 2 which is a movable wall member as shown in FIG.
- the internal combustion engine in which the movable wall member is utilized may be a two-stroke engine or a four-stroke engine. In the case of a four-stroke engine, the movable wall member of the present invention can also be applied to the intake valve.
- FIG. 2 is a front view of the exhaust valve according to the present embodiment.
- FIG. 3 is a partial cross-sectional view of the contact surface side of the exhaust valve of FIG.
- the exhaust valve 4 includes a shaft 4 a and a disk-like flange 4 b provided at an end of the shaft 4 a.
- the flange portion 4 b has a buffer layer 6 and a corrosion resistant layer 7 on the surface facing the combustion chamber side.
- the exhaust valve 4 (base material) is a heat-resistant alloy.
- the heat-resistant alloy stainless steel such as SUH31, SNCrW, or Ni-based alloy such as Nimonic 80A (both made of Daido Steel) may be used.
- the main component of stainless steel is Fe, and may contain unavoidable components such as Mn.P.S. Table 1 shows main minor components (mass%) of stainless steel used as a base material.
- the buffer layer 6 is a layer that can buffer the influence of the base material when forming the corrosion resistant layer 7.
- the “influence of the base material” refers to the fact that Cr contained in the weld material used for forming the corrosion resistant layer reacts with C contained in the base material to be diluted. Alternatively, it simply means that Cr contained in the weld material is diluted by melting the components intended by melting by welding.
- the buffer layer 6 is made of a heat-resistant alloy different from the base material and the corrosion resistant layer 7. Although not particularly limited, the C content of the buffer layer 6 is smaller than that of the base material, and the range of 0.15 mass% or less is preferable. The C content of the buffer layer 6 may exceed 0.09 mass%.
- the buffer layer 6 may have one or more layers. The total thickness of the buffer layer 6 may be appropriately set according to the size of the exhaust valve and the like.
- the corrosion resistant layer 7 is a layer formed by overlay welding in multiple layers using a 50Cr-50Ni alloy as a welding material.
- the 50Cr-50Ni alloy includes Ni of 50% by mass or more and 60% by mass or less and Cr of 40% by mass or more and 50% by mass or less based on 100% of the total mass.
- the 50Cr-50Ni alloy contains 0.10 mass% or less of C, 0.50 mass% or less of Fe, 0.20 mass% or less of Si, 0.20 mass% or less of Mn, 0.020 mass% or less of P, 0.50 mass% or less of Cu, Ti0. It may contain 30 to 1.0% by mass.
- the corrosion resistant layer 7 is configured by laminating two or more buildup layers.
- the content of Cr is higher as the cladding layer is farther from the base material. It is preferable that the Cr content of the cladding layer provided with the outermost surface be equal to or similar to the Cr content of the welding material.
- the corrosion resistant layer 7 has a configuration in which a first buildup layer 8, a second buildup layer 9, and a third buildup layer 10 are sequentially stacked on the buffer layer 6 (see FIG. 3).
- the third buildup layer 10 includes the outermost surface of the corrosion resistant layer 7 and serves as a contact surface of the exhaust valve 4.
- the Cr content of the third buildup layer 10 is 40% by mass or more and 50% by mass or less.
- the Cr content of the second buildup layer 9 is lower than the Cr content of the third buildup layer 10.
- the Cr content of the first buildup layer 8 is lower than the Cr content of the second buildup layer 9.
- the total thickness of the corrosion resistant layer 7 can be appropriately set according to the size of the exhaust valve 4. If the corrosion resistant layer 7 is too thick, the manufacturing cost is increased, and therefore, it is preferable that the total thickness of the corrosion resistant layer 7 be a minimum thickness at which desired corrosion resistance can be obtained.
- the corrosion resistant layer 7 has a multilayer structure of two or more layers and the total thickness of the corrosion resistant layer 7 is about 4 mm to 5 mm.
- the total thickness of the corrosion resistant layer 7 is preferably about 6 mm to 8 mm.
- the Cr content does not change in the thickness direction, and thus the above effects can not be obtained even if the total thickness is the same.
- the buffer layer 6 and the corrosion resistant layer 7 are provided in order on the surface (the contact surface side) facing the combustion chamber side of the flange portion 4 b of the exhaust valve 4.
- the buffer layer 6 may be suitably formed by a method suitable for the material constituting the buffer layer 6.
- the corrosion resistant layer 7 is formed by overlay welding in multiple layers (layers) using a welding material.
- a wire or rod-like 50Cr-50Ni alloy is used as the welding material.
- the first buildup layer 8 to the third buildup layer 10 are formed using the same kind of welding material under the same conditions, but the Cr content in each final layer is different.
- the first buildup layer 8 formed immediately above the buffer layer 6 is strongly affected by the base material, so Cr is diluted.
- the influence of the base material is gradually reduced, and the dilution (diffusion) of Cr is suppressed. Therefore, it is possible to make the Cr content of the buildup layer provided with the tactile surface equal to that of the welding material component by making the layer piled up.
- the welding can be performed by gas shield metal arc welding (MIG welding or MAG welding), laser welding, TIG welding, PTA (plasma) welding, but the corrosion resistant layer 7 is most preferably formed by MAG welding.
- MIG welding gas shield metal arc welding
- MAG welding MAG welding
- laser welding TIG welding
- PTA (plasma) welding PTA (plasma) welding
- the corrosion resistant layer 7 is most preferably formed by MAG welding.
- a shielding gas used for MAG welding a gas containing Ar as a main component and mixed with He and CO 2 may be used. Thereby, the bead shape can be made uniform, and the occurrence of welding defects can be reduced.
- CO 2 is dissociated into carbon and oxygen by heat at the time of welding, and at that time, it takes heat, so it has an effect of suppressing the temperature rise of the molten pool.
- a shield gas mixed with CO 2 it is possible to suppress the heat loss of the arc and also to suppress the spatter.
- the current value at the time of welding may be set to a value which is 0.8 or more and 0.9 or less, when the base current of the welding apparatus to be used is 1. High temperature cracks can be prevented by lowering the current value more than before and suppressing the temperature rise of the molten pool.
- the surface buildup of the buildup layer of 1 is performed by machining.
- another buildup layer is formed on the buildup layer 1 and then another buildup layer is formed by machining.
- annealing and finish processing are performed as in the conventional method.
- the inclusion of impurities can be reduced when the next layer is welded by facing the buildup layer to be the base, so that the generation of welding defects can be prevented.
- FIG. 4 shows the procedure for forming the first buildup layer of the corrosion resistant layer.
- FIGS. 5 and 6 show a diagram for explaining bead formation.
- FIG. 5 is a cross-sectional view of the exhaust valve.
- FIG. 6 is a view of the exhaust valve as viewed from a flange portion side (a flange surface side provided with a corrosion resistant layer).
- the exhaust valve (base material) 4 provided with the buffer layer 6 is preheated to about 80 ° C. or more and 120 ° C. or less, preferably about 100 ° C.
- a burner or an electric furnace can be used for preheating.
- the temperature change of the lower layer (base material and buffer layer) at the time of bead formation can be moderated, so even if the material has a high Cr content, the difference in thermal expansion can be mitigated and cracking of the base material due to tension Can be prevented.
- the first bead 8a is formed on the buffer layer 6 along the outer periphery of the flange portion 4b (first pass).
- air cooling is performed until the interpass temperature becomes 200 ° C. or less, and then the bead center is shifted to the inside of the first bead 8 a to form the second bead 8 b so as to contact the first bead 8 a 2 passes).
- the third bead 8c is formed inside the second bead 8b after air cooling again until the interpass temperature becomes 200 ° C. or less. Bead formation and air cooling are repeated until the surface of the buffer layer 6 is covered with the weld metal.
- the interpass temperature is the temperature of the weld metal (bead) and the adjacent base material immediately before welding the next pass.
- the interpass temperature is obtained by measuring the temperature of the weld metal using a non-contact thermometer. By air-cooling until the interpass temperature becomes 200 ° C. or lower, the temperature rise of the lower layer is suppressed, so high temperature cracking can be prevented.
- the first buildup layer is formed inward from the outer peripheral side of the flange portion in order, but may be formed from the inner side to the outer peripheral side of the flange portion.
- FIG. 7 is a partial cross-sectional view of a movable wall member according to an experimental example.
- the material of the exhaust valve 4 (base material) was 15Cr-14Ni-2Si-2.5W-0.4C (SUH31).
- the buffer layer 6 was formed by MAG welding using an alloy steel in which the carbon content exceeds 0.09 mass%.
- the buffer layer 6 had a 4 to 5 layer configuration (total thickness 10 mm to 12 mm).
- the corrosion resistant layer 7 was formed using a 50Cr-50Ni alloy.
- a wire 11 having a Cr content of 44% was used.
- the welding was MAG welding, and the current value was 140A.
- the first bead was formed along the outer periphery of the flange surface. After waiting for the interpass temperature to fall below 200 ° C., a second bead was formed inside the first bead. The bead formation and air cooling were repeated to form a first buildup layer 8.
- the bead height was about 2 mm to 4 mm.
- the upper surface of the first buildup layer 8 was cut and surfaced.
- the thickness of the first buildup layer 8 after the surface deposition was 1.5 mm to 2.5 mm.
- the second built-up layer 9 was formed on the first built-up layer 8 in the same manner as the first built-up layer 8 and was subjected to surface appearance.
- the Cr content of the first buildup layer 8 and the second buildup layer 9 was measured.
- the Cr content was 33% by mass for the first buildup layer 8 and 40% by mass for the second buildup layer 9. From this result, it was confirmed that the Cr content rate equivalent to a welding material is securable in the outermost layer of a corrosion resistant layer by piling up a corrosion resistant layer in multiple layers.
- FIG. 8 is a front view of the exhaust valve according to the present embodiment.
- the corrosion resistant layer 17 is formed directly on the exhaust valve (base material) 4.
- the other configuration is the same as that of the first embodiment.
- the corrosion resistant layer 17 is a layer formed by overlay welding in multiple layers using a 50Cr-50Ni alloy as a welding material.
- the 50Cr-50Ni alloy includes Ni of 50% by mass or more and 60% by mass or less and Cr of 40% by mass or more and 50% by mass or less based on 100% of the total mass.
- the 50Cr-50Ni alloy contains 0.10 mass% or less of C, 0.50 mass% or less of Fe, 0.20 mass% or less of Si, 0.20 mass% or less of Mn, 0.020 mass% or less of P, 0.50 mass% or less of Cu, Ti0. It may contain 30 to 1.0% by mass.
- the corrosion resistant layer 17 has a multilayer structure of two or more layers, preferably three or more layers.
- the total thickness of the corrosion resistant layer 17 is preferably about 6 mm to 9 mm.
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Abstract
Description
本発明は、内燃機関に用いられる可動壁部材であって、母材上に、最表面が触火面となる耐食層を有し、前記耐食層が、Ni50質量%以上60質量%以下、Cr40質量%以上50質量%以下を含む合金を用いて多層に肉盛溶接されてなる可動壁部材を提供する。
本実施形態では、船舶用ディーゼルエンジンの排気弁を例として説明する。図2は、本実施形態に係る排気弁の正面図である。図3は、図2の排気弁における触火面側の部分断面図である。
排気弁4のフランジ部4bの燃焼室側を向いた面(触火面側)に、緩衝層6および耐食層7を順に設ける。緩衝層6は、緩衝層6を構成する材料に適した方法で適宜形成されるとよい。
上記実施形態に従って耐食層を形成し、耐食層の各層のCr含有率を確認した。図7は、実験例に係る可動壁部材の部分断面図である。排気弁4(母材)の材料は、15Cr-14Ni-2Si-2.5W-0.4C(SUH31)とした。緩衝層6は、炭素量が0.09質量%を超える合金鋼を用いて、MAG溶接により形成した。緩衝層6は、4から5層構成(総厚さ10mmから12mm)とした。
図8は、本実施形態に係る排気弁の正面図である。本実施形態は、排気弁(母材)4上に直接耐食層17が形成されている。それ以外は、第1実施形態と同様の構成である。
2 ピストン
3 排気管
4 排気弁(母材)
4a 軸部
4b フランジ部
5 燃焼室
6 緩衝層
7,17 耐食層
8 第1肉盛層
9 第2肉盛層
10 第3肉盛層
11 ワイヤ(溶接材)
Claims (4)
- 内燃機関に用いられる可動壁部材であって、
母材上に、最表面が触火面となる耐食層を有し、
前記耐食層が、Ni50質量%以上60質量%以下、Cr40質量%以上50質量%以下を含む合金を用いて多層に肉盛溶接されてなる可動壁部材。 - 前記耐食層のうち、前記最表面を備えた層が、Cr40質量%以上50質量%以下を含む請求項1に記載の可動壁部材。
- 母材を80℃以上120℃以下に予熱したあと、Ni50質量%以上60質量%以下、Cr40質量%以上50質量%以下を含む合金を層状に肉盛溶接する溶接方法であって、
層を形成する際のパス間温度を200℃以下として溶接する溶接方法。 - 前記合金を層状に肉盛溶接する際に、1の層の形成後に面出しを行った後、前記1の層の上に次の層を肉盛溶接する請求項3に記載の溶接方法。
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