Isothermal Forging of Titanium Alloys Using Large Precision-Cast Dies.

摘要

The technology of isothermal forging of titanium alloys in large precision-cast dies was established. Twelve forging die castings were produced in the range of 200to 1400lb per die half. MAR-M 200and IN-100nickel-base superalloys were selected as die materials on the basis of their hot hardness,high-temperature strength,oxidation resistance,and castability. A molding system was devised which utilized a ceramic molding process and allowed for the production of dies having a high degree of precision,good surface finish,casting integrity,and fine grain structure in the die cavity. Induction heating systems were developed to heat the dies in the forging press to 1800F. (Author)