Method for casting alloy without any segregation

Abstract

Abstract PURPOSE:To produce an alloy without any segregation by adding the specific pressure at the temp. of just above the solidified temp. of the alloy at the time of solidifying after melting the alloy and solidifying the alloy under over-cooling condition. CONSTITUTION:At the time of solidifying after melting the alloy, at the temp. of just above the m.p. of this alloy, the pressure deltap (atm) is added to the atmospheric pressure so as to become deltaT>=50 deg.C as shown in the equation deltaT=k( v/ h)Tf.deltap and solidification of the alloy is completed before distribution of solute is widely developed by making over-cooling state of the alloy. In the equation, each term shows as follows. deltaT: over-cooling temp. ( deg.C) v: volume change according to melting of the element having the largest wt.% among components composing the alloy (cm<3>/mol) h: enthalpy change according to melting of the element having the largest wt.% among components composing the alloy (cal/mol) Tf: m.p. of the element having the largest wt.% among components composing the alloy ( deg.C) deltap: pressure to be added to the atmospheric pressure (atm) k: coefficient according to the unit change (41.30)

Inventors

• 👤 Akihiko Takahashi
• 👤 Makio Iino

Bibliographic Details