公开(公告)号：EP0694082A1

公开(公告)日：1996-01-31

申请号：EP94910931.0

申请日：1994-03-14

Applicant: UNITED TECHNOLOGIES CORPORATION

Inventor： ALLEN, William P. ,  PARILLE, Donald R.

IPC: C21D3 ,  C22B9 ,  C22F1

CPC classification number: C22F1/10 ,  C21D3/02 ,  C22B9/14 ,  C22F1/02

Abstract: Superalloy articles are made more oxidation resistant by a process which includes heating the article in an environment having a reduced pressure of inert gas and a low partial pressure of oxygen to a temperature at which the sulfur in the article diffuses out. The heat treatment is best carried out at a temperature 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. Alternatively, the heat treatment may be carried out at a temperature above the gamma prime solvus temperature of the article and below the incipient melting temperature of the article. At such temperatures, sulfur readily diffuses out of the article, and a more oxidation resistant component is produced.

公开(公告)号：EP0694083A1

公开(公告)日：1996-01-31

申请号：EP94915803.0

申请日：1994-04-14

Applicant: UNITED TECHNOLOGIES CORPORATION

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 ,  C22B9 ,  C22F1

CPC classification number: C22F1/10 ,  C21D3/02 ,  C22B9/14 ,  C22F1/02

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 °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：EP0694083B1

公开(公告)日：1997-07-23

申请号：EP94915803.4

申请日：1994-04-14

Applicant: UNITED TECHNOLOGIES CORPORATION

Inventor： ALLEN, William P. ,  BORNSTEIN, Norman S. ,  CHIN, Stephen ,  DECRESCENTE, Michael ,  DUHL, David N. ,  PARILLE, Donald R. ,  PIKE, Roscoe A. ,  SMEGGIL, John G.

IPC: C22B9/14 ,  C22F1/02 ,  C22F1/10

CPC classification number: C22F1/10 ,  C21D3/02 ,  C22B9/14 ,  C22F1/02

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 °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：EP0694082B1

公开(公告)日：1997-05-28

申请号：EP94910931.8

申请日：1994-03-14

Applicant: UNITED TECHNOLOGIES CORPORATION

Inventor： ALLEN, William P. ,  PARILLE, Donald R.

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

CPC classification number: C22F1/10 ,  C21D3/02 ,  C22B9/14 ,  C22F1/02

Abstract: Superalloy articles are made more oxidation resistant by a process which includes heating the article in an environment having a reduced pressure of inert gas and a low partial pressure of oxygen to a temperature at which the sulfur in the article diffuses out. The heat treatment is best carried out at a temperature within the range defined by the incipient melting temperature of the article and about 150 °C below the incipient melting temperature of the article. Alternatively, the heat treatment may be carried out at a temperature above the gamma prime solvus temperature of the article and below the incipient melting temperature of the article. At such temperatures, sulfur readily diffuses out of the article, and a more oxidation resistant component is produced.