Effect of Hf additions on phase transformation, microstructural stability, and hardness of nanocrystalline 304L stainless steels synthesized by mechanical alloying

Kotan, Hasan; Polat, Gökhan; Yıldız, Aydan

doi:10.1016/j.apt.2021.07.004

Cited by 10 publications

(1 citation statement)

References 47 publications

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“…Hence, the mean interparticle distance between oxides in the matrix is one of the manipulating parameters that regulate the material system's microstructural changes and resultant mechanical properties. The solution limit of Y in Fe is also very poor at room temperature [24]. Thus, it is hard to solve Y into Fe matrix by conventional metallurgy process.…”

Section: Introductionmentioning

confidence: 99%

Structural evolution of mechanically alloyed ODS steel powders during ball milling and subsequent annealing treatment

Salur

2022

International Advanced Researches and Engineering Journal

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In the present work, a novel 9Cr oxide-dispersion strengthened (ODS) steel powders with Y2O3 (0.5 wt%) dispersoids were synthesized by high planetary ball milling at different time intervals (2, 8, and 16 hours). The structural and crystallographical evolution of the produced powders during the ball milling and post-annealing treatment were evaluated by SEM, XRD, and micro-Vickers hardness analyses. The SEM results showed that the fine dispersions of powders were achieved with the extending milling time. When milling time was 8h, it was observed that the mean size of powders increased maximum level of 101 μm and then dramatically reduced to 5 μm at latest milling time (16h). The XRD data revealed that the crystallite size of ODS powders diminished gradually with increasing milling time. Plus, all reflection peaks of the Fe, Cr, W, Mo expanded and the diffraction peaks of the Y2O3, W progressively disappeared with the increasing milling time. The hardness results revealed that the increasing milling time was beneficial for hardness improvement, due to dominant strain hardening mechanism and it developed from 160 to 334 Hv after 16h of milling protocol. To understand high temperatures characteristics such as grain growth, phase transformation, and hardness of produced powders, 16h milled powders subjected to post-annealing treatments at 700 oC and 900 oC for 1 h. When pure Fe and Cr peaks were observed in the non-annealed powders, no evident reflection peak of Y2O3 was observed. However, all pure Fe and Cr reflection peaks became narrower and Y2O3 reflection exhibited more sharper tendency with increased annealing temperatures, which resulted in increased grain growth and formation of Fe-based oxide structures.

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Section: Introductionmentioning

confidence: 99%

Structural evolution of mechanically alloyed ODS steel powders during ball milling and subsequent annealing treatment

Salur

2022

International Advanced Researches and Engineering Journal

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Welding Dissimilar Alloys of CoCrFeMnNi High-Entropy Alloy and 304 Stainless Steel Using Gas Tungsten Arc Welding

Zhang

Cheng

et al. 2023

J. of Materi Eng and Perform

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Microstructural Characterization and Hardness Study of Nanostructured CoCrFeNi High Entropy Alloys with Dual Effect of Y and Nano-Sized Y2O3 Additions

Teki̇n

Kotan

2022

Trans Indian Inst Met

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Effect of Hf additions on phase transformation, microstructural stability, and hardness of nanocrystalline 304L stainless steels synthesized by mechanical alloying

Cited by 10 publications

References 47 publications

Structural evolution of mechanically alloyed ODS steel powders during ball milling and subsequent annealing treatment

Structural evolution of mechanically alloyed ODS steel powders during ball milling and subsequent annealing treatment

Welding Dissimilar Alloys of CoCrFeMnNi High-Entropy Alloy and 304 Stainless Steel Using Gas Tungsten Arc Welding

Microstructural Characterization and Hardness Study of Nanostructured CoCrFeNi High Entropy Alloys with Dual Effect of Y and Nano-Sized Y2O3 Additions

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