Tham khảo tài liệu 'asm metals handbook - desk edition (asm_ 1998) episode 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | o redrawing o The second and successive deep-drawing operations in which cup-like shells are deepened and reduced in cross-sectional dimensions. See also deep drawing . o reducing agent o 1 A compound that causes reduction thereby itself becoming oxidized. 2 A chemical that at high temperatures lowers the state of oxidation of other batch chemicals. o reducing atmosphere o 1 A furnace atmosphere that tends to remove oxygen from substances or materials placed in the furnace. 2 A chemically active protective atmosphere that at elevated temperature will reduce metal oxides to their metallic state. Reducing atmosphere is a relative term and such an atmosphere may be reducing to one oxide but not to another oxide. o reducing flame o 1 A gas flame produced with excess fuel in the inner flame. 2 A gas flame resulting from combustion of a mixture containing too much fuel or too little air. See also neutral flame and oxidizing flame . o reduction o 1 In cupping and deep drawing a measure of the percentage decrease from blank diameter to cup diameter or of diameter reduction in redrawing. 2 In forging rolling and drawing either the ratio of the original to final cross-sectional area or the percentage decrease in cross-sectional area. 3 A reaction in which there is a decrease in valence resulting from a gain in electrons. Contrast with oxidation . o reduction cell o A pot or tank in which either a water solution of a salt or a fused salt is reduced electrolytically to form free metals or other substances. o reduction in area RA o The difference between the original cross-sectional area of a tensile specimen and the smallest area at or after fracture as specified for the material undergoing testing. Also known as reduction of area. o reel o 1 A spool or hub for coiling or feeding wire or strip. 2 To straighten and planish a round bar by passing it between contoured rolls. o reel breaks o Transverse breaks or ridges on successive inner laps of a coil that results from crimping
