Formation of nanoscale complex oxide particles in mechanically alloyed ferritic steel

A new method for the quantitative analysis of the scale and composition of nanosized oxide in 9Cr-ODS steel

“…In addition, while the crystalline structure of the nanosized oxide in this series of alloys has been identified as Y 2 Ti 2 O 7 from high-resolution transmission electron microscopy (HRTEM) [4], the composition is difficult to determine correctly using energy-dispersive X-ray spectroscopy (EDX) in the TEM due to the matrix effects. Although atom probe analysis (AP) is a powerful tool for characterizing the composition of nanoprecipitates, the effect of the matrix due to evaporation aberration needs to be taken into account when the size of the precipitates drops below a few nanometers [5].…”

Designing Ultrahigh Strength Steels with Good Ductility by Combining Transformation Induced Plasticity and Martensite Aging

“…[12][13][14][15][16][17] While both types of alloys, i.e., TRIP steels [3][4][5][6][7][8][9][10][11] and maraging steels [12][13][14][15][16][17] have been well investigated, the combination of the two mechanisms in the form of a set of simple Fe-Mn alloys as suggested in this work, namely, the precipitation hardening of transformation-induced martensite by intermetallic nanoparticles, opens a novel and lean alloy path to the development of ultrahigh strength steels that has not been much explored in the past. [18,19] We refer to these alloys as maraging TRIP steels.Related steel design trends that are based on small-scaled second phase precipitates are also pursued by using oxide, [20][21][22][23] nitride, [24,25] or Cu nanosized particles. [26] Other pathways to the design of ultrahigh strength steels have been realized in ultra fine grained materials obtained by advanced thermomechanical processing [27][28][29][30][31][32][33][34] or by accumulative roll bonding.…”

“…Related steel design trends that are based on small-scaled second phase precipitates are also pursued by using oxide, [20][21][22][23] nitride, [24,25] or Cu nanosized particles. [26] Other pathways to the design of ultrahigh strength steels have been realized in ultra fine grained materials obtained by advanced thermomechanical processing [27][28][29][30][31][32][33][34] or by accumulative roll bonding.…”

Feasibility of using Y2Ti2O7 nanoparticles to fabricate high strength oxide dispersion strengthened Fe–Cr–Al steels

“…It has been found that without Al addition, Ti can effectively refine the oxide particles in the ODS steels by combining with yttrium and oxygen to form stable Y-Ti-O oxides (Y 2 Ti 2 O 7 , Y 2 Ti 2 O 5 or non-stoichiometric compounds) with a size distribution from 2 to 30 nm [13][14][15]. Brocq et al [16] observed that titanium, yttrium and oxygen…”

“…But the orientation relationship was not provided. In this work, according to equation (2) [12,15,17]. As a result, the interface relationship between Y 2 Ti 2 O 7 and the matrix in our alloys is different from the conventional ODS steels.…”