公开(公告)号：DE69404455D1

公开(公告)日：1997-08-28

申请号：DE69404455

申请日：1994-04-14

Applicant: UNITED TECHNOLOGIES CORP

Inventor： ALLEN WILLIAM P ,  BORNSTEIN NORMAN S ,  CHIN STEPHEN ,  DECRESCENTE MICHAEL ,  DUHL DAVID N ,  PARILLE DONALD R ,  PIKE ROSCOE A ,  SMEGGIL JOHN G

IPC: C21D3/02 ,  C22B9/14 ,  C22F1/00 ,  C22F1/02 ,  C22F1/10

Abstract: Superalloy articles are made more oxidation resistant by a process which includes heat treating the article in the presence of foreign chemical species, at a temperature at which the foreign chemical species reacts with and modifies any oxide film present on the article surface. The heat treatment is best carried out at a temperature above the gamma prime solvus temperature of the article and below the incipient melting temperature of the article. Alternatively, the heat treatment may be carried out within the range defined by the incipient melting temperature of the article and about 150 DEG C. below the incipient melting temperature of the article. At such temperatures the foreign chemical species reacts with and modifies the oxide film on the article surface. Sulfur is then able to diffuse through such modified film, and a more oxidation resistant component is produced.

公开(公告)号：DE69404455T2

公开(公告)日：1998-02-26

申请号：DE69404455

申请日：1994-04-14

Applicant: UNITED TECHNOLOGIES CORP

Inventor： ALLEN WILLIAM P ,  BORNSTEIN NORMAN S ,  CHIN STEPHEN ,  DECRESCENTE MICHAEL ,  DUHL DAVID N ,  PARILLE DONALD R ,  PIKE ROSCOE A ,  SMEGGIL JOHN G

IPC: C21D3/02 ,  C22B9/14 ,  C22F1/00 ,  C22F1/02 ,  C22F1/10

Abstract: Superalloy articles are made more oxidation resistant by a process which includes heat treating the article in the presence of foreign chemical species, at a temperature at which the foreign chemical species reacts with and modifies any oxide film present on the article surface. The heat treatment is best carried out at a temperature above the gamma prime solvus temperature of the article and below the incipient melting temperature of the article. Alternatively, the heat treatment may be carried out within the range defined by the incipient melting temperature of the article and about 150 DEG C. below the incipient melting temperature of the article. At such temperatures the foreign chemical species reacts with and modifies the oxide film on the article surface. Sulfur is then able to diffuse through such modified film, and a more oxidation resistant component is produced.