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Improved Properties of Lead-Antimony Alloys by Thermomechanical Treatments.

PB250653

Publication Date	1975
Personal Author	Tilman, M. M.; Crosby, R. L.; Neumeier, L. A.
Page Count	33
Abstract	The Bureau of Mines developed a rolling method that improves creep resistance and yield strengths of lead alloys containing up to 5 wt-pct Sb. The 0.69-inch-thick slab-cast alloys were breakdown-rolled to 0.226 inch and finish-rolled to 0.063 inch at 5- or 20-pct reduction per pass. Rolling was at room temperature to simulate conventional cold rolling, and at 75, 125, and 175C. Two alternative methods evaluated consisted of (1) a single cold final pass followed by annealing and (2) a single hot final pass. Two additional processing methods involving percipitation strengthening were included for comparison. Compared with conventional cold rolling, hot rolling at 125 and 175C with multiple light passes vastly improves creep resistance and raises yield strengths. Tensile strengths are less affected. The other treatments also improve creep resistance significantly and generally improve tensile properties; magnitudes vary with treatment and composition.
Keywords	Lead alloys Antimony containing alloys Rolling Metal working Heat treatment Tensile properties Creep strength Yield strength Microstructure
Source Agency	Bureau of Mines
NTIS Subject Category	71N - Nonferrous Metals & Alloys
Corporate Authors	Bureau of Mines, Rolla, MO. Rolla Metallurgy Research Center.
Document Type	Technical Report
Title Note	Research rept. FY 1975.
NTIS Issue Number	197611

Improved Properties of Lead-Antimony Alloys by Thermomechanical Treatments.

Improved Properties of Lead-Antimony Alloys by Thermomechanical Treatments.
PB250653

Publication Date	1975
Personal Author	Tilman, M. M.; Crosby, R. L.; Neumeier, L. A.
Page Count	33
Abstract	The Bureau of Mines developed a rolling method that improves creep resistance and yield strengths of lead alloys containing up to 5 wt-pct Sb. The 0.69-inch-thick slab-cast alloys were breakdown-rolled to 0.226 inch and finish-rolled to 0.063 inch at 5- or 20-pct reduction per pass. Rolling was at room temperature to simulate conventional cold rolling, and at 75, 125, and 175C. Two alternative methods evaluated consisted of (1) a single cold final pass followed by annealing and (2) a single hot final pass. Two additional processing methods involving percipitation strengthening were included for comparison. Compared with conventional cold rolling, hot rolling at 125 and 175C with multiple light passes vastly improves creep resistance and raises yield strengths. Tensile strengths are less affected. The other treatments also improve creep resistance significantly and generally improve tensile properties; magnitudes vary with treatment and composition.
Keywords	Lead alloys Antimony containing alloys Rolling Metal working Heat treatment Tensile properties Creep strength Yield strength Microstructure
Source Agency	Bureau of Mines
NTIS Subject Category	71N - Nonferrous Metals & Alloys
Corporate Authors	Bureau of Mines, Rolla, MO. Rolla Metallurgy Research Center.
Document Type	Technical Report
Title Note	Research rept. FY 1975.
NTIS Issue Number	197611