The effect of temperature and strain rate on the 0-2% yield strength, ultimate tensile strength, and percentage elongation of M250 maraging steel was investigated under uniaxial tensile conditions in the temperature range from 25 (room temperature) to 550°C and strain rate range 10-4-10-1 s-1. Up to 400°C the steel shows essentially strain rate insensitive behaviour with a gradual decrease in the 0-2% yield strength and ultimate tensile strength. The elongation remains constant at all strain rates up to 300°C. Fractographic analysis indicates that the increasing strain rate induces strain constraint resulting in an increased dimple size. An elongated structure was observed at temperatures above 400°C. X-ray diffraction reveals the presence of reverted austenite in the specimens tested at 550°C. © 1996 The Institute of Materials.

Venkatanarayana, G.Arumugham, S.Lakshmanan, T.S.Prasad Rao, P.2026-02-05Effect ofMaterials Science and Technology (United Kingdom), 1996, 12, 7, pp. 607-6092670836https://doi.org/10.1179/mst.1996.12.7.607https://idr.nitk.ac.in/handle/123456789/280621996The effect of temperature and strain rate on the 0-2% yield strength, ultimate tensile strength, and percentage elongation of M250 maraging steel was investigated under uniaxial tensile conditions in the temperature range from 25 (room temperature) to 550°C and strain rate range 10-4-10-1 s-1. Up to 400°C the steel shows essentially strain rate insensitive behaviour with a gradual decrease in the 0-2% yield strength and ultimate tensile strength. The elongation remains constant at all strain rates up to 300°C. Fractographic analysis indicates that the increasing strain rate induces strain constraint resulting in an increased dimple size. An elongated structure was observed at temperatures above 400°C. X-ray diffraction reveals the presence of reverted austenite in the specimens tested at 550°C. © 1996 The Institute of Materials.