公开(公告)号：CA1074674A

公开(公告)日：1980-04-01

申请号：CA259896

申请日：1976-08-26

Applicant: UNITED TECHNOLOGIES CORP

Inventor： CETEL ALAN D ,  DUNTHORNE HECTOR B ,  GELL MAURICE L ,  HENRICKS ROBERT J

IPC: C22C19/05 ,  C22F1/10

Abstract: MULTI-STEP HEAT TREATMENT FOR SUPERALLOYS This invention relates to a multi-step heat treatment method for increasing the elevated temperature mechanical properties of nickel base superalloys. The heat treatment method is particularly applicable to those conventional alloys which have a cast structure consisting essentially of a gamma matrix containing a gamma prime second phase precipitate and regions of low melting constituents. The effect of the process of the invention is to maximize the volume fraction of the fine gamma prime precipitate, by a solution treatment and reprecipitation, without causing significant incipient melting.

公开(公告)号：CA1299070C

公开(公告)日：1992-04-21

申请号：CA539121

申请日：1987-06-08

Applicant: UNITED TECHNOLOGIES CORP

Inventor： HENRICKS ROBERT J ,  MARCIN JOHN J ,  WAHL JACQUELINE B ,  PINKOWISH ALEXANDER A

IPC: C22F1/10 ,  C22F1/00 ,  C23F1/00 ,  C30B33/00 ,  F01D5/28 ,  F02C3/06 ,  C30B29/52

Abstract: Stress Relief of Single Crystal Superalloy Articles A coated nickel base superalloy single crystal turbine airfoil blade (1), which is subject to gas turbine engine operation, can crack during refurbishment by a stress corrosion mechanism when exposed to certain corrosive media. The rapid thermal cycling that occurs during typical gas turbine engine operation results in high, non-uniform stresses across the airfoil, producing large localized residual strains in the article at ambient temperatures. Exposure to a corrosive environment, such as during coating removal or agressive cleaning, can produce chordwise cracks in a large number of the airfoils exposed. Such cracking is avoided by subjecting the articles to a preliminary stress relieving heat treatment which reduces the residual strains to a level below which cracking will not occur, prior to exposure to the corrosive media.

公开(公告)号：CA1094928A

公开(公告)日：1981-02-03

申请号：CA275987

申请日：1977-04-12

Applicant: UNITED TECHNOLOGIES CORP

Inventor： HENRICKS ROBERT J ,  RUCKLE DUANE L ,  SLACK RAYMOND B

IPC: C22F1/18

Abstract: METHOD FOR IMPROVING FATIGUE PROPERTIES OF TITANIUM ALLOY ARTICLES A thermomechanical treatment to improve the fatigue strength of articles made from one of a class of alpha beta titanium alloys. The treatment involves heating the alloy into the beta field, hot deforming the alloy at a temperature within the beta field, rapidly quenching the alloy to room temperature to produce a hexagonal martensite structure and then tempering at an intermediate temperature so as to produce a structure in which discrete equiaxed beta phase particles are present in an acicular alpha matrix. This structure is particularly resistant to the initiation and propagation of fatigue cracks. EH-4422