Strength and Fracture of SPKh18N9T Steel and SP36KNM Alloy under Dynamic Loading

We present results of an experimental investigation of the strength properties of SPKh18N9T steel and SP36KNM alloy and the characteristics of fracture processes in these materials under dynamic loading. It is shown that, under conditions of uniaxial static tension, the standard mechanical characteristics of these materials are very close to each other. Moreover, as the strain rate increases to 10³ sec^?1, they undergo slight changes (thus, the yield limit and the ultimate strength increase by at most 13% and 6%, respectively, and the relative elongation at rupture decreases by 5%). At the same time, under impact loading, the impact strength of SPKh18N9T steel is twice that exhibited by SP36KNM alloy. This fact can be partially explained by the difference in the initial porosities of these materials.