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91 - 100 / 2000
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91.
Enhanced performance of austenitic oxide dispersion-strengthened 316L steel: a study on ▫$Y_2O_3$▫ reinforcement and corrosion behaviour
Jan Pokorný, Jiří Kubásek, Črtomir Donik, David Nečas, Vojtěch Hybášek, Jaroslav Fojt, Anna Dobkowska, Irena Paulin, Jaroslav Čapek, Matjaž Godec, 2025, original scientific article

Abstract: This study explores the mechanical and corrosion properties of yttria-reinforced 316L stainless steel. Powder precursor materials were prepared using mechanical alloying. Varying yttria (Y2O3) contents (1, 3, and 5 wt%) were used to assess its impact on the steel’s properties. X-ray diffraction and scanning electron microscopy confirmed the successful dispersion of Y2O3 within the matrix, with the formation of chromium carbides during spark plasma sintering (SPS). The mechanical properties, including hardness and compressive yield strength, improved with increasing Y2O3 contents, with the highest strength observed in the 316L-5Y2O3 sample. However, corrosion resistance decreased with higher yttria concentrations. The 3 wt% Y2O3 sample exhibited the highest corrosion rate due to localized corrosion in areas enriched with oxide particles and chromium carbides. Electrochemical testing revealed that carbide formation and Cr-depleted regions from SPS processing contributed to the corrosion behaviour. These findings suggest that while yttria reinforcement enhances mechanical strength, optimizing the Y2O3 content and processing methods is crucial to balance both mechanical and corrosion performance in ODS 316L stainless steel.
Keywords: mechanical milling, SPS, 316L, austenitic stainless steel, yttria, ODS steel, corrosion, EPR-SL
Published in DiRROS: 31.01.2025; Views: 90; Downloads: 63
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92.
The distance function on Coxeter-like graphs and self-dual codes
Marko Orel, Draženka Višnjić, 2025, original scientific article

Abstract: Let $SGL_n(\mathbb{F}_2)$ be the set of all invertible $n\times n$ symmetric matrices over the binary field $\mathbb{F}_2$. Let $\Gamma_n$ be the graph with the vertex set $SGL_n(\mathbb{F}_2)$ where a pair of matrices $\{A,B\}$ form an edge if and only if $\textrm{rank}(A-B)=1$. In particular, $\Gamma_3$ is the well-known Coxeter graph. The distance function $d(A,B)$ in $\Gamma_n$ is described for all matrices $A,B\in SGL_n(\mathbb{F}_2)$. The diameter of $\Gamma_n$ is computed. For odd $n\geq 3$, it is shown that each matrix $A\in SGL_n(\mathbb{F}_2)$ such that $d(A,I)=\frac{n+5}{2}$ and $\textrm{rank}(A-I)=\frac{n+1}{2}$ where $I$ is the identity matrix induces a self-dual code in $\mathbb{F}_2^{n+1}$. Conversely, each self-dual code $C$ induces a family ${\cal F}_C$ of such matrices $A$. The families given by distinct self-dual codes are disjoint. The identification $C\leftrightarrow {\cal F}_C$ provides a graph theoretical description of self-dual codes. A result of Janusz (2007) is reproved and strengthened by showing that the orthogonal group ${\cal O}_n(\mathbb{F}_2)$ acts transitively on the set of all self-dual codes in $\mathbb{F}_2^{n+1}$.
Keywords: Coxeter graph, invertible symmetric matrices, binary field, rank, distance in graphs, alternate matrices, self-dual codes
Published in DiRROS: 31.01.2025; Views: 73; Downloads: 47
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93.
Gozdarska mehanizacija v letu 2023
Peter Smolnikar, 2024, professional article

Keywords: gozdarska mehanizacija
Published in DiRROS: 31.01.2025; Views: 104; Downloads: 51
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94.
Kazalnik – primarna odprtost slovenskih gozdov 2023 : rezultati ankete
Jaša Saražin, Gašper Ogrin, 2024, professional article

Keywords: odprtost gozdov, Slovenija, kazalniki, ekosistemske storitve, funkcije gozdov
Published in DiRROS: 31.01.2025; Views: 101; Downloads: 57
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95.
96.
Cene žaganega lesa iglavcev : rezultati ankete
Špela Ščap, Matjaž Dremelj, 2024, professional article

Keywords: les, tržne razmere
Published in DiRROS: 31.01.2025; Views: 101; Downloads: 55
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97.
Cene gozdnih lesnih sortimentov iz zasebnih gozdov na slovenskem trgu v novembru 2024
Peter Smolnikar, Špela Ščap, 2024, professional article

Keywords: les, tržne razmere
Published in DiRROS: 31.01.2025; Views: 105; Downloads: 58
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98.
Predstavljamo nov kazalnik : Trg z gozdnimi nepremičninami
Matjaž Dovečar, Matevž Triplat, 2024, professional article

Keywords: nepremičninski trg, gozdne nepremičnine, Evropa
Published in DiRROS: 31.01.2025; Views: 94; Downloads: 50
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99.
Gostitev dveh mednarodnih dogodkov v Ajdovščini za požarno odpornejšo srednjo Evropo
Jaša Saražin, Gašper Ogrin, Ana Seifert Barba, 2024, professional article

Keywords: gozdni požari, požarna odpornost, Evropa
Published in DiRROS: 31.01.2025; Views: 106; Downloads: 53
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100.
Izvajanje EUDR prestavljeno na konec leta 2025
Matjaž Dovečar, Špela Ščap, Tomaž Remic, 2024, professional article

Keywords: gozdarstvo, krčenja gozdov, EUDF, Evropa
Published in DiRROS: 31.01.2025; Views: 114; Downloads: 58
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