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The objective of this work was to measure the formability of INCOLOY alloy MA 956 sheet. This alloy, an iron, 19.5 weight percent chromium, 4.5 weight percent aluminum alloy strengthened by a fine dispersion of yttrium oxide particles, was designed to exhibit good strength and corrosion resistance at 1100°C, for uses such as combustor components in gas turbine engines. Sheet formability was measured utilizing conventional techniques. Tension tests in the longitudinal, transverse, and 45-deg directions produced strength and ductility data, work hardening exponents, and the coefficient of anisotropy (r-value). Results of Swift cup tests were used to determine deep drawing characteristics. Olsen cup test results were used to rate the stretchability of the sheet and effectiveness of different lubricants. Strain analysis of specimens, via the grid technique, yielded failure strain data and a forming limit diagram was produced. Attempts to interrelate these formability indexes, utilizing methods developed for conventional sheet materials, met with varying amounts of success. Although not highly formable compared to conventional alloys, MA 956 does exhibit a usable degree of formability, indicating a capability to be formed into simple shapes.
formability, dispersion strengthened, sheet, tensile properties, ductility, work hardening, stretchability, drawability, lubrication, strain, powder, gas turbine, mechanical alloying
Senior metallurgist, Technical Services, Inco Research and Development Center, Inc., Sterling Forest, Suffern, N.Y.
Project leader, Process Development, Wiggin Alloys Limited, Hereford,