Material Factors in Adiabatic Shearing in Steels

A Workability Criterion for the Transformed Adiabatic Shear Band Phenomena during Cold Heading of 1038 Steel

“…This finding agrees with the results of Rogers and Shastry, [27] who related this difference in the hardness measurement to the extremely fine martensite grains and to the additive effect oflattice hardening due to supersaturation by carbon on quenching. The hardness of the TASB was slightly higher than that obtained by a water quenched specimen after it was heated to 1000°C.…”

Effect of high strain rate on plastic deformation of a low alloy steel subjected to ballistic impact

“…While Rogers and Shastry [16] recorded white etching bands in quenched and tempered AISI 1018 steel, investigations by Meyers and Wittman [2] showed that deformed bands are formed in the same steel in normalized condition (pearlitic structure). Optical micrograph of a quench hardened and tempered (at 638 • C for 1 h) HY-100 steel after deformation at about 10 3 s −1 showed formation of deformed bands during adiabatic shearing and TEM investigations on this steel revealed highly elongated martensite laths that extended in shear directions and fine equiaxed cells with high dislocation densities [16]. It was suggested by the investigators that the equiaxed cells formed by partitioning of elongated subgrains into rectangular cells followed by a subsequent breakdown of the elongated subgrains consisting mainly of carbides.…”

Experimental Studies of Shear Band Formation Through Temperature Measurements and High Speed Photography

“…is clear that the material in the shear band becomes considerably harder [21], and, as mentioned previously, etches white in a nital solution [26]. However, it has not yet been shown that the temperature rise is sufficiently great or that there is sufficient time at elevated temperature for a phase transformation to austenite and then to untempered martensite, as…”