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    1.
    发明专利
    未知

    公开(公告)号：DE4440229A1

    公开(公告)日：1995-05-11

    申请号：DE4440229

    申请日：1994-11-10

    Applicant: UNITED TECHNOLOGIES CORP PRATT

    Inventor： SCHIRRA JOHN J ,  MILLER JOHN A ,  HATALA ROBERT W

    IPC: C22C19/05 ,  C22F1/00 ,  C22F1/10

    Abstract: A method of heat treating articles cast of a superalloy, comprising a nickel-base alloy capable of forming a chromium carbide precipitate, such as INCONEL 939 TM . The method includes selective heating of the article to cause chromium and carbon nuclei in the lattice of the crystals in the superalloy to go into solution, and selective cooling of the article to cause the formation of discrete chromium carbide nuclei along the grain boundary of the crystals. Additional heating steps may be performed to enhance the size of the chromium carbide nuclei. Articles so treated have improved mechanical properties.

    3.
    发明专利
    未知

    公开(公告)号：DE4436186C2

    公开(公告)日：2001-10-25

    申请号：DE4436186

    申请日：1994-10-10

    Applicant: UNITED TECHNOLOGIES CORP PRATT

    Inventor： FRELING MELVIN ,  GRUVER GARY A ,  PARKOS JUN JOSEPH J ,  WELCH DOUGLAS A

    IPC: F01D5/14 ,  F01D5/20 ,  F01D5/28 ,  F04D29/02 ,  F04D29/08 ,  F04D29/32 ,  F04D29/38

    Abstract: A method and apparatus for increasing blade fatigue strength in a turbine engine. The blades in the turbine engine are configured so as to reduce stress at the tip of the blades during operation of the turbine engine, thus increasing blade fatigue strength. This stress reduction helps to counteract the detrimental effect of abrasive tip coatings on blade fatigue strength. In one embodiment, the tip of the blade is chamfered in order to reduce the stress on the tip of the blade. An abrasive coating is then applied to the tip of the blade to assist the blade in seating into an abradable outer air seal. In another embodiment, an abrasive coating is applied to a center portion of the tip of the blade, with the periphery of the abrasive coating being set back from the opposing surfaces of the blade.

    5.
    发明专利
    未知

    公开(公告)号：DE4436670A1

    公开(公告)日：1995-05-04

    申请号：DE4436670

    申请日：1994-10-13

    Applicant: UNITED TECHNOLOGIES CORP PRATT

    Inventor： BROWN EDGAR E ,  SCHIRRA JOHN J ,  VIENS DANIEL V

    IPC: C22F1/10 ,  C22C19/03 ,  C22C19/05 ,  C22F1/00 ,  C22C1/08

    Abstract: Provided is a cast nickel-base superalloy having improved machinability characteristics having a formulation by weight percent of: upto 0.017 carbon, 0 - 0.015 phosphorus, 0 - 0.015 sulfur 17.00 - 21.00 chromium, 50.00 - 55.00 nickel, 2.80 - 3.30 molybdenum, 4.40 - 5.50 niobium and tantalum combined, 0.30 - 0.80 aluminum, 0.65 - 1.15 titanium, 0 - 0.006 boron, 0 - 0.35 manganese, 0 - 1.00 cobalt, 0 - 0.35 silicon, 0 - 0.30 copper, and the balance iron. The cast article may be hot-isostatically pressed at a temperature and pressure sufficient to substantially reduce segregation within the nickel-base superalloy, and thereafter heat-treated to achieve a fill precipitation heat-treated condition, which substantially increases the strength of the superalloy. Subsequent to hot-isostatic pressing and heat-treatment, the cast article has a standard machinability rating of at least 13% when compared to an AMS5010 steel.

    6.
    发明专利
    未知

    公开(公告)号：DE4436186A1

    公开(公告)日：1995-05-04

    申请号：DE4436186

    申请日：1994-10-10

    Applicant: UNITED TECHNOLOGIES CORP PRATT

    Inventor： FRELING MELVIN ,  GRUVER GARY A ,  PARKOS JUN JOSEPH J ,  WELCH DOUGLAS A

    IPC: F01D5/14 ,  F01D5/20 ,  F01D5/28 ,  F04D29/02 ,  F04D29/08 ,  F04D29/32 ,  F04D29/38 ,  F01D5/12 ,  C23C4/10 ,  B23P15/02 ,  B23P9/04 ,  B23P9/02

    Abstract: A method and apparatus for increasing blade fatigue strength in a turbine engine. The blades in the turbine engine are configured so as to reduce stress at the tip of the blades during operation of the turbine engine, thus increasing blade fatigue strength. This stress reduction helps to counteract the detrimental effect of abrasive tip coatings on blade fatigue strength. In one embodiment, the tip of the blade is chamfered in order to reduce the stress on the tip of the blade. An abrasive coating is then applied to the tip of the blade to assist the blade in seating into an abradable outer air seal. In another embodiment, an abrasive coating is applied to a center portion of the tip of the blade, with the periphery of the abrasive coating being set back from the opposing surfaces of the blade.

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