公开(公告)号：DE4440229C2

公开(公告)日：2003-01-30

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

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.