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    AS-CAST HIGH STRENGTH NODULAR IRON WITH FAVORABLE MACHINABILITY
    3.
    发明申请
    AS-CAST HIGH STRENGTH NODULAR IRON WITH FAVORABLE MACHINABILITY 审中-公开

    公开(公告)号：US20200095655A1

    公开(公告)日：2020-03-26

    申请号：US16136445

    申请日：2018-09-20

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Jianghuai Yang ,  James D. Cremonesi ,  Qigui Wang ,  Eduardo Velasco Orosco ,  Dale A. Gerard

    IPC: C22C37/10 ,  C22C37/06

    Abstract: A nodular iron alloy and automotive components, such as crankshafts, are provided. The nodular iron alloy may include iron, about 3.3-3.9 wt % carbon, about 0.2-0.5 wt % manganese, about 1.9-2.6 wt % silicon, about 0.15-0.30 wt % copper, about 0.03-0.06 wt % magnesium, about 0-0.02 wt % sulfur, about 0-0.1 wt % chromium, about 0-0.05 wt % phosphorus, and/or about 0-0.01 wt % tin. The nodular iron alloy may include a number of graphite nodules, each having a diameter between 15 and 120 micrometers, and the graphite nodules having a number density of at least 90 per square millimeter. Iron may surround the graphite nodules in an amount of 20-40% of a ferrite microstructure and 60-80% of a pearlite microstructure. The nodular iron alloy may have an ultimate tensile strength in the range of 550 MPa to 680 MPa as-cast and at least 80% nodularity.

    CRANKSHAFT NOSE END DESIGN
    5.
    发明申请
    CRANKSHAFT NOSE END DESIGN 有权

    公开(公告)号：US20250146534A1

    公开(公告)日：2025-05-08

    申请号：US18502423

    申请日：2023-11-06

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Suman Bargav R ,  Durga Prasad Kandula ,  James D. Cremonesi

    IPC: F16C3/06

    Abstract: Vehicles, crankshaft assemblies for vehicles, and methods for connecting vehicle accessory components and crankshafts are provided. A vehicle includes an engine configured to produce a linear motion output; a crankshaft configured to convert the linear motion output to rotational motion and terminating at an end with a tapered exterior surface extending to a central surface; an annular ring having a proximal ring surface, a distal ring surface, a ring opening, and a tapered inner surface, wherein the end of the crankshaft is received in the ring opening; and a fastener fixed to the crankshaft and holding the annular ring against the tapered exterior surface.

    High-modulus, high-strength nodular iron and crankshaft
    6.
    发明授权
    High-modulus, high-strength nodular iron and crankshaft 有权

    公开(公告)号：US11618937B2

    公开(公告)日：2023-04-04

    申请号：US16657146

    申请日：2019-10-18

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Jianghuai Yang ,  Qigui Wang ,  Dale A. Gerard ,  James D. Cremonesi ,  Daniel J. Wilson

    IPC: C22C37/08 ,  F16C3/06 ,  C22C37/10

    Abstract: A nodular iron alloy and automotive components, such as a crankshaft, are provided. The nodular iron alloy may include iron, about 2.2-3.2 wt % carbon, about 1.7-2.3 wt % silicon, about 0.2-0.6 wt % manganese, a maximum of 0.03 wt % phosphorus, a maximum of 0.02 wt % sulfur, about 0.2-0.6 wt % copper, about 0.1-0.4 wt % chromium, about 0.4-0.8 wt % nickel, about 0.15-0.45 wt % molybdenum, about 0.2-1.0 wt % cobalt, about 0.02-0.06 wt % magnesium, and a maximum of 0.002 wt % rare earth element(s). The nodular iron alloy may have a Young's modulus in the range of 175-195 GPa and an as-cast ultimate tensile strength in the range of 750-950 MPa. This alloy possesses favorable strength, stiffness and noise/vibration/harshness qualities, making it suitable in crankshaft applications. A method of forming the nodular iron alloy includes feeding a magnesium-based material into a molten iron alloy through a continuous system at a constant amount.

    TORSIONAL DAMPER AND METHOD OF WELDING PARTS HAVING DISSIMILAR MATERIALS
    9.
    发明申请
    TORSIONAL DAMPER AND METHOD OF WELDING PARTS HAVING DISSIMILAR MATERIALS 有权

    公开(公告)号：US20210402504A1

    公开(公告)日：2021-12-30

    申请号：US16913406

    申请日：2020-06-26

    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS LLC

    Inventor： Daniel J. Wilson ,  Huaxin Li ,  James D. Cremonesi ,  Jianghuai Yang ,  Liang Wang ,  Qigui Wang

    IPC: B23K20/12 ,  B23K20/227 ,  B23K20/02

    Abstract: A method of joining first and second parts formed of dissimilar materials is provided. The first part defines a first part contacting surface having a frustoconical shape. The first and second parts are brought into contact with one another, with one of the first and second parts being rotated while the other remains stationary, so as to generate frictional heat between the contacting surfaces of the parts, the generated frictional heat producing softened adjacent regions in the first and second parts. A force is applied to the first and second parts to plastically deform the softened adjacent regions and to forge together the first and second parts to form a solid-state joint. A composite torsional damper hub assembly includes a steel stem and a damper hub welded to the stem at an interface. The damper hub is formed of aluminum or an aluminum alloy, and the interface is generally frustoconical.

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