Effect of the Initial Powder and Treatment on the Structure of Oxide Dispersion-Strengthened Steel

Optimization of Electric-Pulse Consolidation Regimes to Obtain High-Density Dispersion-Hardened Reactor Steel

“…The aim of this research is to develop oxide dispersion-hardened chromium steel [1-6], since its mechanical properties and high-temperature strength are better than those of the conventionally used steel [1,4,5]. The main method of producing such steel is powder metallurgy and the commonly used methods of powder consolidation (in decreasing order) -hot extrusion, hot isostatic pressing, and the electric-pulse method [7][8][9][10][11].Two basic problems must be solved in order to produce oxide-dispersion-hardened steel: obtaining a uniform volumetric distribution of hardening nanoparticles and obtaining high-density compacts. This can be accomplished in two basic ways: optimization of the mechanical alloying regime (time, mill rotation speed, and avoidance of overheating of the powder) and optimization of the electric pulse consolidation regimes.…”

“…The aim of this research is to develop oxide dispersion-hardened chromium steel [1][2][3][4][5][6], since its mechanical properties and high-temperature strength are better than those of the conventionally used steel [1,4,5]. The main method of producing such steel is powder metallurgy and the commonly used methods of powder consolidation (in decreasing order) -hot extrusion, hot isostatic pressing, and the electric-pulse method [7][8][9][10][11].…”

“…This can be accomplished in two basic ways: optimization of the mechanical alloying regime (time, mill rotation speed, and avoidance of overheating of the powder) and optimization of the electric pulse consolidation regimes. The dispersity of the oxide particles has been studied previously and it has been shown that even during mechanical alloying the Y 2 O 3 particles are quite uniformly distributed in the powder within 15 h [10] and they are uniformly distributed in the volume of the sample during grinding in optimized regimes [11].…”