Metallurgy under pressure

Rashev, Ts.; Zhekova, L. Ts.; Bogev, P. V.

doi:10.3103/s0967091217010132

Cited by 9 publications

(5 citation statements)

References 5 publications

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“…Such steels are known as chromium–manganese austenitic stainless steels (grades 200 series), and they are encountered in many engineering applications owing to the great mechanical properties combined with acceptable corrosion resistance. 1,2…”

Section: Introductionmentioning

confidence: 99%

Effect of chloride ions on corrosion behaviour of austenitic nickel and nickel free stainless steels in phosphoric acid solutions

Tzaneva

Loukaycheva

Fachikov

et al. 2015

Corrosion Engineering, Science and Technology

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The effect of chloride ions' presence (0?005-1?0M NaCl) in phosphoric acid solutions (5, 40 and 75%) on the corrosion behaviour of three austenitic stainless steels (an experimental steel Fe-18Cr-12Mn-0?6N and two trade grades, Fe-18Cr-9Ni and Fe-14Cr-15Mn-0?2N) has been studied by potentiodynamic polarisation measurements. The surface examinations of the samples tested involved X-ray photoelectron spectroscopy as well as optical and scanning electron microscopy. It was established that chlorides added to phosphoric acid solutions deteriorate the general corrosion resistance, and under anodic polarisation, they provoke pitting corrosion. The composition of the stainless steels significantly influences its corrosion behaviour in the phosphoric acid solutions containing chloride ions. The replacement of nickel with manganese and nitrogen on top of lower chromium content has a strong negative effect on the corrosion resistance.

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Section: Introductionmentioning

confidence: 99%

Effect of chloride ions on corrosion behaviour of austenitic nickel and nickel free stainless steels in phosphoric acid solutions

Tzaneva

Loukaycheva

Fachikov

et al. 2015

Corrosion Engineering, Science and Technology

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“…isomer shift for stainless steel [34,35]. The doublets D (1) and D(2) are of hyperfine parameters (namely, isomer shift Is and quadrupole shift Qs) in value close to the parameters of the doublets from intrusion of one and two (so-called dumbbell configurations) atoms of nitrogen into the octahedral interstitial positions in the crystal lattice of FCC iron [30,31]. The sextet SAFM with an hyperfine magnetic structure corresponds to a part of the formed γ phase with a large (≥20%) content of manganese [32,33].…”

Section: Mössbauer and Tem Analysis Of Ma Samplesmentioning

confidence: 99%

“…In the modern technology of production of the materials with specific (improved) functional properties a great emphasis is placed on the design of the high-nitrogen steels, alloys, and composites [1][2][3]. This is due to the (i) need for economically alloyed steels and (ii) feasibility of substitution of nitrogen for the high-cost nickel and manganese.…”

Section: Introductionmentioning

confidence: 99%

Structure-Phase Transformations in the Course of Solid-State Mechanical Alloying of High-Nitrogen Chromium-Manganese Steels

Lyashkov

Шабашов

Заматовский

et al. 2021

Metals

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The solid-state mechanical alloying (MA) of high-nitrogen chromium-manganese austenite steel—MA in a planetary ball mill, —was studied by methods of Mössbauer spectroscopy and transmission electron microscopy (TEM). In the capacity of a material for the alloying we used mixtures of the binary Fe–Mn and Fe–Cr alloys with the nitrides CrN (Cr2N) and Mn2N. It is shown that ball milling of the mixtures has led to the occurrence of the α → γ transitions being accompanied by the (i) formation of the solid solutions supersaturated with nitrogen and by (ii) their decomposition with the formation of secondary nitrides. The austenite formed by the ball milling and subsequent annealing at 700–800 °C, was a submicrocrystalline one that contained secondary nano-sized crystalline CrN (Cr2N) nitrides. It has been established that using the nitride Mn2N as nitrogen-containing addition is more preferable for the formation and stabilization of austenite—in the course of the MA and subsequent annealing—because of the formation of the concentration-inhomogeneous regions of γ phase enriched with austenite-forming low-mobile manganese.

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“…Under normal pressure, the solubility of nitrogen in liquid iron is very low, which limits the production of high nitrogen steel. Therefore, the current production of high nitrogen steel mainly adopts pressure smelting method [5,6], or by adding a certain amount of Cr/Mn element, in order to improve the solubility of N element [7]. Adding nitrogen to stainless steel can reduce the digestion of Ni, and can improve the corrosion resistance of stainless steel, especially in the three corrosion conditions of pitting, knife-line corrosion and intergranular corrosion in chloride ion environment.…”

Section: Introductionmentioning

confidence: 99%

Effect of N on corrosion resistance of Fe-Cr-Ni-Mo-Mn alloy

Liu

Wang

Guo

et al. 2021

Mater. Res. Express

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In order to develop the Fe-Cr-Ni-Mo-Mn-N corrosion resistant alloys, analyze the influence of nitrogen on the corrosion resistance of Fe-Cr-Ni-Mo-Mn alloy, adjust the N content in the alloy system, and Flux cored wires with different N content were prepared. They were surfaced on low carbon steel by MIG welding. The phase composition, microstructure and corrosion resistance of the cladding metal were analyzed to studied the effect of N content on the structure and performance of the surfacing metal. The results show that the addition of nitrogen does not change the matrix structure (which is Fe-Ni-Cr austenite), but with the increase of nitrogen content, the precipitation of nitrides （ Cr2(C,N) and BN ） is

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Metallurgy under pressure

Cited by 9 publications

References 5 publications

Effect of chloride ions on corrosion behaviour of austenitic nickel and nickel free stainless steels in phosphoric acid solutions

Effect of chloride ions on corrosion behaviour of austenitic nickel and nickel free stainless steels in phosphoric acid solutions

Structure-Phase Transformations in the Course of Solid-State Mechanical Alloying of High-Nitrogen Chromium-Manganese Steels

Effect of N on corrosion resistance of Fe-Cr-Ni-Mo-Mn alloy

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