Determination of the Transverse Properties of ESR 4340 Steel.
Final rept. 3 Aug 78-20 Jun 80,
GEORGIA INST OF TECH ATLANTA SCHOOL OF MECHANICAL ENGINEERING
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The objective of the present investigation is to determine the transverse engineering mechanical and fracture toughness properties of electroslag remelted high strength AISI 4340 steel in plate sizes 0.4 inch 10 mm, 1.0 inch 25 mm and 1-78 inch 45 mm and to correlate these properties with microstructural features. The results of the various tests Double Ligament, Tensile, and Double Torsion indicate that the difference between the longitudinal X and long transverse Y properties of heat 9060 step-forged 1-78 and 1.0 inch plate portions are at best minor in nature. The same is true with the 0.4 inch-thick cross-rolled ESR 4340 plate heat 2780. The most significant property differences exist between X and Y direction properties on the one hand and those of through thickness Z direction on the other. On comparing the above results with data obtained for heat 9060 at other forging reductions, an increasing sensitivity of ductility decrease to increasing reduction is apparent in the Z direction. Scanning Electron Microscope work indicates that the degree of colonization present among the non-metallic inclusions present may be related to the range of ductility-related properties encountered in any particular orientation. Author
- Metallurgy and Metallography