Role of A2 and A50 process on the oxide dispersion strengthened ferritic alloy fabricated by mechanical alloying

Yu, Zhenhua; Xiong, Weihao; Qu, Jun Feng; Lin, Sen

doi:10.1016/j.matdes.2010.12.050

Cited by 5 publications

(3 citation statements)

References 23 publications

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“…On one hand, dispersion of the oxide spots in the interior of the recrystallised grains could pin dislocations and subgrain boundaries; on the other hand, segregation of the multiple oxides at grain boundaries could effectively inhibit the growth of grains. 17,19 These two strengthening mechanisms guaranteed for obtaining the alloy samples with excellent properties. However, the existence of the oxide segregation would produce large stress concentration, which could reduce the interfacial bonding strength between the particles and then easily become crack source, as seen in Fig.…”

Section: Discussionmentioning

confidence: 95%

“…Under the premise of ensuring the low activity of the alloy, composition design in the preparation of master alloy and the adjustment in the atomisation process according to the actual working conditions contributed to obtain the samples with uniform microstructure and superior properties. The continuous acting forces of braking and cold welding between milling balls and alloy powders as well as powders and powders should be accounted for the realisation of MA, 17 in which the yttria powders were mechanically scattered and dispersed in the broken grains of the powder matrix with the solid solution reaction, and it was the solid solution that makes the diffraction peaks shift to the left gradually in the first 15 min of the high energy milling, as seen in Fig. 2.…”

Section: Discussionmentioning

confidence: 99%

“…The continuous acting forces of braking and cold welding between milling balls and alloy powders as well as powders and powders should be accounted for the realisation of MA, 17 in which the yttria powders were mechanically scattered and dispersed in the broken grains of the powder matrix with the solid solution reaction, and it was the solid solution that makes the diffraction peaks shift to the left gradually in the first 15 min of the high energy milling, as seen in Fig. 2.…”

Section: Discussionmentioning

confidence: 99%

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Oxide dispersion strengthened ferritic steel fabricated by mechanical alloying and spark plasma sintering

et al. 2013

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The production process of a reduced activation oxide dispersion strengthened ferritic steel with nominal composition of Fe–12Cr–2·5W–0·2Ti–0·25Y2O3 (designated 12Cr-ODS) was investigated in this study. Master alloy with designed composition was prepared first, and the powder with two sizes obtained by atomising was prealloyed by mechanical alloying with added Y2O3 powder, followed by consolidated spark plasma sintering. Characteristics of the samples were investigated by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and relative density, and the mechanical properties such as hardness (HV), bending strength and tensile strength were also tested. Sample with 50% coarse particles and 50% fine particles was found to be of better comprehensive properties. Mechanical properties of the sample changed with the improved microstructure of refining grains and optimised oxide particles that were acquired through annealing. However, further research on the dispersion and properties of oxide particles is needed in the future.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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