Large-size diesel exhaust valve and manufacturing method thereof

    公开(公告)号:US12104508B1

    公开(公告)日:2024-10-01

    申请号:US18710730

    申请日:2022-11-15

    摘要: Provided are a large-size diesel exhaust valve and a manufacturing method thereof, which relate to the technical field of manufacturing of large-size diesel exhaust valves for ships. The large-size diesel exhaust valve includes an exhaust valve disc portion made of a 3J40 alloy, and the large-size diesel exhaust valve has the following microstructure: there are ultra-fine grains with a grain size of 10 grade or more, α-Cr lamellar phases are evenly distributed at grain boundaries of the ultra-fine grains, nickel-lean Cr—Al—Ce particle phases are evenly distributed in a matrix, a single lamella of the α-Cr lamellar phases has a thickness of less than 140 nm, and the nickel-lean Cr—Al—Ce particle phases have a diameter of less than 10 μm. The present application solves the technical problem of how to improve the comprehensive mechanical properties and the vibration-damping performance of a large-size diesel exhaust valve simultaneously.

    Corrosion-resistant nickel alloy
    7.
    发明授权

    公开(公告)号:US12098446B2

    公开(公告)日:2024-09-24

    申请号:US18505145

    申请日:2023-11-09

    申请人: Hainan University

    IPC分类号: C22C19/05 C22C1/02

    CPC分类号: C22C19/055 C22C1/023

    摘要: A corrosion-resistant nickel alloy is provided. The alloy includes the following components in percentage by mass: 4.68-5.35% of B, 5.69-6.41% of W, 27.68-28.39% of Cr, 12.65-13.42% of Al, and the balance of Ni and inevitable impurities. The corrosion-resistant nickel alloy is a Ni—W—B ternary alloy with main components of Ni, W and B, wherein the three elements have strong high-temperature corrosion resistance at a temperature of about 600° C., and have the potential of solid solution hardening and precipitate formation because all belong to solid solution forming elements, so that a creep strength of a nickel alloy matrix is improved. Meanwhile, Al and Cr are further added in the alloy formula, so that Al2O3 and Cr2O3 oxide layers can be formed, which play a role as a physical diffusion barrier against chlorine gas and other corrosive gases.

    SELECTIVE HEAT TREATMENT OF METALS USING MULTIPLE INDUCTION HEATING COILS

    公开(公告)号:US20240254578A1

    公开(公告)日:2024-08-01

    申请号:US18162860

    申请日:2023-02-01

    IPC分类号: C21D1/42 C21D11/00 C22C19/05

    CPC分类号: C21D1/42 C21D11/00 C22C19/05

    摘要: The present disclosure provides assemblies, systems and methods for a single-step process for selective heat treatment of metals. More particularly, the present disclosure provides assemblies, systems and methods for a single-step process for selective heat treatment of metals using multiple induction heating coils. A hybrid modeling-test approach can be used in the design process to improve or optimize the process parameters to achieve location specific and improved/optimal microstructure and residual stress to enhance the part performance. It is also noted that performing the selective heat treatment in a single step can reduce the cycle time significantly. Moreover, large thermal gradients can be avoided in the part as different volumes of the part are heated to their desired temperature simultaneously.