Investigation of Separation-Lubrication Substances for Use in Isothermal Forging.

摘要

A successful interface separation-lubrication substance for titanium alloy isothermal forging must simultaneously satisfy a number of demanding requirements including: 1) elevated temperature stability in a preheating environment; 2) complete chemical compatibility with workpiece alloys and dies; 3) freedom from die accumulation tendencies; 4) minimal adhesion to the hot dies after forging; and 5) excellent friction reducing properties. Evaluation techniques for these factors (except for friction reduction) were developed and applied to a series of separation-lubrication compositions representing both current state-of-technology materials and advanced formulations. Other factors such as ease of application and fusion behavior were determined. Several classes of advanced compositions were evaluated at specific temperature intervals from 1300F to 1800F. These systems included both workpiece precoat and die applied coatings. Die materials represented IN-100, TRW VIA Mod R and silicon nitride; preheat time ranged from one-half to four hours; and titanium alloys included both the alpha-beta Ti-6Al-4V and the beta stabilized 'Beta C'.