Classifications

• • 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
• • 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
  • C22C19/07—Alloys based on nickel or cobalt based on cobalt
• • 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

Definitions

• the present invention has excellent high temperature hardness, thermal shock resistance, and oxidation-corrosion-corrosion resistance, and the engine, loop, and parts of an internal combustion engine that require these characteristics in particular.
• Co-based alloys (hereinafter referred to as conventional Co-based alloys) have been widely used.
• the conventional Co-based alloy described above satisfies the above requirements in terms of high temperature hardness, but does not have the properties of thermal shock resistance and oxidation corrosion corrosion resistance. Therefore, in the production of high-performance engine, its components, and lube sheets, the conventional Co alloy is used for overlay welding and further for casting.
• the current state of the invention is that it does not show a sufficiently satisfactory service life when used for a long time.
• the inventors of the present invention have found that the high temperature hardness required for an internal combustion engine, in particular, an engine of a high-performance engine, a loop of the engine, and a engine of the engine, As a result of our research, we have developed a material that has resistance to thermal shock and resistance to lead oxide corrosion, and that can be used for overlay welding and for deposits. 0.5 to 3.5. , S i: 0.1 to 3.0%,
• the C component is combined with C r ,, Mo, T i, and Nb.
• the S i component has an effect of improving the formability, overlay welding property, and melt flowability, but if its content is less than 0.1%, the desired improving effect on the above action cannot be obtained. 3. further improvement effect it also depends be contained beyond the 0% this and force et al. that can not be expected, it determined the content of 0.1 to 3.0% and.
• the Cr component a part of it forms a solid solution in the matrix, and some of it forms carbides, which especially improves high-temperature hardness, and also improves high-temperature wear resistance and lead-oxidation resistance.
• carbides which especially improves high-temperature hardness, and also improves high-temperature wear resistance and lead-oxidation resistance.
• the W component has the function of refining the carbides, forming the carbides themselves, and forming a solid solution in the matrix to strengthen them, thereby improving the high temperature hardness and high temperature strength of the alloy. but that the content is 0.1 less than 1% can not be obtained the desired effect on the operation angle, whereas 1 7. containing seat beyond 0% Since it causes the build-up weldability and machinability to deteriorate, the content was determined to be 0.1-: I 7.0%.
• the Mo component has the function of forming a solid solution in the base material in the coexistence with W, strengthening it, and forming carbides to improve the high temperature hardness (high temperature wear resistance) and high temperature strength of the alloy.
• This power its content is 0.:! It was set at ⁇ 1 0.0%.
• the T i component not only suppresses the growth of the crystal grains of the base material, but rather refines the crystal grains and combines with the M C type carbides and nitrides, and Ni and A1.
• the A1 component improves the resistance to lead oxide corrosion together with C r, and combines with Ni and T i as described above to form Ni 3
• the Mn component Since the Mn component has the effect of improving the build-up weldability, it is contained if necessary, especially when build-up weldability is required. However, if the content is less than 0.01%, desired improvement in Mori ⁇ contact resistance can not be obtained, whereas 2.0% further improvement effect it also depends be contained beyond does not appear this and force al, 0. the content of 0 1-2 It was set to 0.0%.
• the Ni component stabilizes the austenite and improves thermal shock resistance and toughness, and also combines with A1 and T i to form an intermetallic compound: Ni 3 (Al, Ti), which also contributes to high temperature. It has the effect of improving hardness (high-temperature wear resistance) and high-temperature strength, and improving lead oxide corrosion resistance in the presence of Cr, so it is necessary especially when these properties are required. However, if the content is less than 8%, the desired effect on the above action cannot be obtained.
• the Fe component has the effect of further improving the thermal shock resistance of the alloy, so it is contained as necessary when the above-mentioned properties are required, but if the content is less than 1%, the desired thermal shock resistance is obtained. However, if the content exceeds 16%, the high temperature hardness will decrease, so the content was defined as 1 to 16%.
• Co-based alloy of the present invention will be specifically described by way of Examples in comparison with Comparative Examples.
• the Co-based alloys 1 to 52 of the present invention each of which has the component composition shown in Table 1, the comparative Co-based base metals 1 to 10 and the above-mentioned conventional Co-based alloys are used.
• the conventional Co-based alloys 1 and 2 having the following composition were melted, and subsequently welded intermittently under normal conditions to form a welding rod with a diameter of 48 °.
• the comparative C 0 -based alloys 1 to 10 each had a composition in which the content of any one of the constituents (marked with * in Table 1) was outside the scope of the present invention. It is a thing.
• the diameter was measured by a TIG automatic welding machine: 120 m ⁇ X thickness : On the surface of the base metal made of stainless steel (SUS 316) with the dimension of 20 mm, the outer diameter : 100 thigh X width : 20 slab thickness : Two layers of 5 mm annular beads were welded by overlay welding.
• the rock well hardness (C scale) at room temperature and the picker hardness at 800 ° C are as follows. The temperature was measured and the base metal on which the annular ring was formed was heated to a temperature of 700 ° C for 15 minutes and then water-cooled for 1 cycle. Repeatedly, a thermal shock resistance test was carried out to measure the number of cycles until cracking occurred in the annular ring. Similarly, a two-layer overlay welding with a thickness of 5 ma was applied to one end of a stainless steel slab (SUS S 16) having a diameter of 15 thighs 0 x length of 100 m.
• SUS S 16 stainless steel slab
• the Co-based alloys 1 to 52 of the present invention are all superior to the conventional Co-based alloys 1 and 2 in high-temperature hardness, thermal shock resistance, and acid resistance. It is clear that it has corrosiveness to lead oxide.
• the content of any one of the constituents is out of the scope of the invention, as seen in the comparative Co-based alloys 1 to 10, the Co-based alloys of the present invention are In comparison with the above, it is clear that at least one of the above characteristics is inferior.
• the Co-based alloy of the present invention meets the above-mentioned strict conditions required for the engine valve of the high performance engine and the engine and the valve. It has excellent high-temperature hardness, thermal shock resistance, and lead oxide corrosion resistance that can be satisfied with sufficient margin. The resulting component will have excellent performance over a significant period of time.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• General Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Heat Treatment Of Steel (AREA)
• Powder Metallurgy (AREA)
• Heat Treatment Of Articles (AREA)
• Arc Welding In General (AREA)
• Lift Valve (AREA)

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• 1983
  • 1983-01-18 JP JP58006099A patent/JPS59129746A/ja active Granted
• 1984
  • 1984-01-17 CH CH4428/84A patent/CH662130A5/de not_active IP Right Cessation
  • 1984-01-17 KR KR1019840000195A patent/KR890002282B1/ko not_active Expired
  • 1984-01-17 WO PCT/JP1984/000006 patent/WO1984002928A1/ja not_active Ceased
  • 1984-01-17 DE DE19843490022 patent/DE3490022T1/de not_active Withdrawn
• 1986
  • 1986-09-02 US US06/902,476 patent/US4765955A/en not_active Expired - Lifetime

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