Vacuum induction melting of Ti-6Ai-4V in a cold crucible. Report of Investigations/1988

Technical Report · Sun May 01 04:00:00 EDT 1988

OSTI ID:6295493

Paige, J I

The effect of fluoride inclusions on the properties of titanium produced from the Bureau of Mines-developed induction slag-melting process is of concern to the titanium industry. The objective of the research was to determine the effect of removing the nonconductive molten calcium fluoride (CaF/sub 2/) slag used as an insulator between the titanium and the segmented copper crucible. The data were obtained from single-induction-melted ingots prepared with no CaF/sub 2/ insulating slag and an ingot prepared with the normal addition of 4% CaF/sub 2/ slag. The results showed that the mechanical properties of single-induction-slag-melted and annealed Ti-6Al-4V alloy exceed the minimum values specified in Aerospace Materials Specification for Titanium Alloy Bars and Forgings AMS4928H. High-cycle, tension-tension fatigue testing yielded similar results. The data from 44 of the 45 specimens were contained within the typical scatter band for fatigue data on wrought Ti-6Al-4V alloy. Although the removal of the insulating slag is a desirable change, the data from the specimens with the previously standard 4% slag addition showed no detrimental effect from the slag inclusions.

• Research Organization: Bureau of Mines, Albany, OR (USA). Albany Research Center
• OSTI ID: 6295493
• Report Number(s): PB-89-159784/XAB; BUMINES-RI-9211
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
ALKALINE EARTH METAL COMPOUNDS
ALLOYS
ALUMINIUM ALLOYS
ANNEALING
CALCIUM COMPOUNDS
CALCIUM FLUORIDES
CALCIUM HALIDES
FATIGUE
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HEAT TREATMENTS
INCLUSIONS
MECHANICAL PROPERTIES
MELTING
PHASE TRANSFORMATIONS
SHIELDS
SLAGS
THERMAL SHIELDS
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
VACUUM MELTING
VANADIUM ALLOYS