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Source and Control of Nitride Inclusions in Titanium.

PB237034

Publication Date	1974
Personal Author	Henry, J. L.; Hill, S. D.; Anable, W. E.; Schaller, J. L.
Page Count	60
Abstract	The Bureau of Mines investigated possible sources of nitride defects in the production of magnesium-reduced titanium sponge in order to determine if such defects are capable of surviving consumable electrode arc melting. The production of alpha-stabilized nitride inclusions in hot-rolled titanium plate from air contamination of sponge during its manufacture was experimentally demonstrated. The highest incidence of inclusions in hot-rolled plate resulted from sponge which was reduced by air-contaminated magnesium and from subjected to air contamination during the vacuum distillation cycle and during helium sweep. Maintainance of good vacuum-tight integrity, filtration of molten magnesium proir to charging into the reduction retort, and mechanical attrition of sponge to pulverize and disperse nitrides are suggested as practices to lower inclusion incidence in commercial titanium ingots. (Modified author abstract)
Keywords	Titanium Titanium nitrides Inclusions Sponge metal Contamination Nitrogen Defects Ingots Reduction(Chemistry) Casting Grinding Ttianium alloys Kroll process
Source Agency	Bureau of Mines
NTIS Subject Category	71N - Nonferrous Metals & Alloys
Corporate Authors	Bureau Of Mines, Albany, Oreg. Albany Metallurgy Research Center.
Document Type	Technical Report
Title Note	Rept. of investigations.
NTIS Issue Number	197426

Source and Control of Nitride Inclusions in Titanium.

Source and Control of Nitride Inclusions in Titanium.
PB237034

Publication Date	1974
Personal Author	Henry, J. L.; Hill, S. D.; Anable, W. E.; Schaller, J. L.
Page Count	60
Abstract	The Bureau of Mines investigated possible sources of nitride defects in the production of magnesium-reduced titanium sponge in order to determine if such defects are capable of surviving consumable electrode arc melting. The production of alpha-stabilized nitride inclusions in hot-rolled titanium plate from air contamination of sponge during its manufacture was experimentally demonstrated. The highest incidence of inclusions in hot-rolled plate resulted from sponge which was reduced by air-contaminated magnesium and from subjected to air contamination during the vacuum distillation cycle and during helium sweep. Maintainance of good vacuum-tight integrity, filtration of molten magnesium proir to charging into the reduction retort, and mechanical attrition of sponge to pulverize and disperse nitrides are suggested as practices to lower inclusion incidence in commercial titanium ingots. (Modified author abstract)
Keywords	Titanium Titanium nitrides Inclusions Sponge metal Contamination Nitrogen Defects Ingots Reduction(Chemistry) Casting Grinding Ttianium alloys Kroll process
Source Agency	Bureau of Mines
NTIS Subject Category	71N - Nonferrous Metals & Alloys
Corporate Authors	Bureau Of Mines, Albany, Oreg. Albany Metallurgy Research Center.
Document Type	Technical Report
Title Note	Rept. of investigations.
NTIS Issue Number	197426