Hafnium influence on the microstructure of FeCrAl alloys

Geantă, Victor; Voiculescu, Ionelia; Stanciu, Elena Manuela

doi:10.1088/1757-899x/133/1/012016

Cited by 8 publications

(4 citation statements)

References 5 publications

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“…One of the requirements for reactor structural materials, particularly vessel and heat exchanger is that the material must be resistant to corrosion caused by the environment. As a rule, a stainless-steel alloy would contain the one basic alloying element, namely a minimum of 10.5% chromium; this ferritic stainless-steel Fe-24Cr-2Si-0.8Mn alloy include in high chromium ferritic stainless steel classification that usable in wide range of application [1][2].…”

Section: Introductionmentioning

confidence: 99%

INVESTIGATION ON PRECIPITATIONS AND DEFECTS OFTHE Fe-24Cr-2Si-0.8Mn FERRITIC SUPER ALLOY STEEL

Dani¹,

Parikin

Iskandar

et al. 2017

jsmi

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INVESTIGATION ON PRECIPITATIONS AND DEFECTS OF THE Fe-24Cr-2Si-0.8Mn FERRITIC SUPER ALLOY STEEL.A ferritic Fe-24Cr-2Si-0.8Mn alloy was produced from granular ferro-scrap, ferrochrome, ferrosilicon and ferromanganese in a conventional induction furnace. The alloy is dedicated for application as structure material in high temperature devices, such as nuclear reactor vessel and heat exchanger. The alloy has been verified to have high tensile strength and high resistant against corrosion. The aim of this work is to study the microstructures, chemical compositions and precipitation occurred inside grain and grain boundary of the alloy, to obtain more information of its superior physical-chemical properties. STEM-EDX mappings reveal the present of relatively large aluminum oxide, silicon carbide and high oxygen and high carbon containing precipitations on the specimens. The grains that were formed, exhibit relatively strong deformations as obviously shown by the elongated grains and sub-grains with typical high density of dislocations, even though, less mechanical treatments applied. Small porosities are also present homogeneously separated on the whole view area. Keywords:Ferritic Fe-24Cr-2Si-0.8Mn alloy, FIB, SEM, TEM, EDX, STEM, HRTEM ABSTRAK INVESTIGASI TERHADAPPENGENDAPAN DAN KERUSAKAN PADABAJA PADUAN SUPER FERRITIC Fe-24Cr-2Si-0,8Mn. Paduan Fe-24Cr-2Si-0,8Mn feritik dihasilkan dari granular ferro-scrap, ferrochrome, ferrosilicon dan ferromanganese dalam tungku induksi konvensional. Paduan ini didedikasikan untuk aplikasi sebagai bahan struktur pada perangkat suhu tinggi seperti bejana reaktor nuklir dan heat exchanger. Paduan telah diverifikasi memiliki kekuatan tarik tinggi dan tahan terhadap korosi. Tujuan dari penelitian ini adalah untuk mendalami strukturmikro, komposisi kimia dan presipitasi yang terjadi di dalam batas butir dan butir paduan, untuk mendapatkan lebih banyak informasi sifat fisik-kimia superior. Pemetaan STEM-EDX mengungkapkan adanya oksida aluminium yang relatif besar, silikon karbida dan oksigen tinggi dan presipitasi tinggi yang mengandung karbon pada spesimen. Butiran yang terbentuk, menunjukkan deformasi yang relatif kuat seperti yang ditunjukkan oleh butiran dan sub-butiran memanjang dengan kepadatan dislokasi yang khas, walaupun sedikit mendapat perlakuan mekanik. Porositas kecil juga berada secara merata terpisah pada keseluruhan daerah yang diamati. Kata kunci:Paduan Feritik Fe-24Cr-2Si-0.8Mn, FIB, SEM, TEM, EDX, STEM, HRTEM

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Section: Introductionmentioning

confidence: 99%

INVESTIGATION ON PRECIPITATIONS AND DEFECTS OFTHE Fe-24Cr-2Si-0.8Mn FERRITIC SUPER ALLOY STEEL

Dani¹,

Parikin

Iskandar

et al. 2017

jsmi

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“…The mechanical properties and chemical composition of cracking tubes made of KHR 45A steel are listed in Tables 1 and 2, respectively. The main role of Al in the alloy is to form an oxide layer with increased resistance to oxidation at high temperatures, which completes the effect of chromium oxide formation [10]. Cross-sections of the sample were ground first and then polished using silicon carbide (SiC) sandpaper and a diamond suspension, and finally polished using a colloidal silica suspension.…”

Section: Methodsmentioning

confidence: 99%

Effects of Pre- and Post-Carburizing Surface Modification on the Tribological and Adhesion Properties of Heat-Resistant KHR 45A Steel for Cracking Tubes

Amanov

Choi²,

Pyun

2021

Materials

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In this study, the effects of ultrasonic nanocrystal surface modification (UNSM) technology on the tribological properties and scratch-induced adhesion behavior of a heat-resistant KHR 45A steel cracking tube, which is used for the pyrolysis process, were investigated. The main objective of this study is to investigate the effects of pre- and post-carburizing UNSM treatment on the tribological and adhesion performances of carburized domestic KHR 45A (A) steel and to compare the results with the existing carburized Kubota-made KHR 45A steel (B). A carburizing process was carried out on the polished and UNSM-treated KHR 45A steel substrates, which were cut out from the cracking tube, at 300 °C heat exposure for 300 h. The thickness of the carburizing layer was about 10 μm. UNSM technology was applied as pre- and post-carburizing surface treatment; both reduced the friction coefficient and wear rate compared to that of the carburized KHR 45A steel substrate. It was also found that the application of UNSM technology increased the critical load, which implies the improvement of adhesion behavior between the carburizing layer and the KHR steel substrate. The application of UNSM technology as pre- and post-carburizing surface treatment could help replace carburized Kubota-made KHR 45A steel (B) thanks to the improved tribological performance, enhanced scratch resistance, load bearing capacity, and adhesion of domestic KHR 45A (A) steel.

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“…A very important domain where these alloys can be used is that of modern 4R nuclear reactors. In this specific case, the materials used for the reactor and the circulating cooling system must have special mechanical and thermo-physical characteristics such as high resistance to corrosion and erosion in the molten metal environment, resulting from the specific operating conditions [2,3].…”

Section: Introductionmentioning

confidence: 99%

“…FeCrAl grade steels have high corrosion and oxidation resistance by forming a chemically resistant and passive chromium oxide layer [3,4]. In order to improve the resistance to high temperatures in the molten lead environment, a composite structure can also be created at the surface level by depositing a thin alumina layer (plasma spray deposition or laser cladding with powder) which will be then remelted using electron beam or laser processing, for creating a very adherent metalo-ceramic layer [5,6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Irradiation and Temperature on Microstructural Characteristic of FeCrAl Alloys

Voiculescu¹,

Geanta²,

Stanciu

et al. 2018

Acta Phys. Pol. A

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Characteristics of FeCrAl alloys family are currently investigated in order to determine their behavior in different types of environment, erosive and corrosive (solid, liquid or gaseous), at high temperatures (400-1000 • C). The application with a special impact of these alloys consists in their use to build structural components of nuclear power plant (IV generation) at which the cooling medium is made of liquid metal with very high heat transfer capacity (Pb, Pb-Bi, Sn etc). To improve the resistance in extreme conditions (corrosion, erosion, high temperature) of the alloy, a superficial oxide layer may be formed, which constitutes an effective barrier against the destructive action of the working environment. This paper presents some results obtained regarding the influence of gamma irradiation on a FeCrAl alloy surface, after the sample surface was superficially remelted by laser and maintained in molten lead in furnace at 500 • C for 6 to 12 months. Metallographic aspects, such as microstructural changes, layer thicknesses and homogeneity are analyzed. New compounds formed after irradiation using Co-60 gamma rays are investigated.

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Hafnium influence on the microstructure of FeCrAl alloys

Cited by 8 publications

References 5 publications

INVESTIGATION ON PRECIPITATIONS AND DEFECTS OFTHE Fe-24Cr-2Si-0.8Mn FERRITIC SUPER ALLOY STEEL

INVESTIGATION ON PRECIPITATIONS AND DEFECTS OFTHE Fe-24Cr-2Si-0.8Mn FERRITIC SUPER ALLOY STEEL

Effects of Pre- and Post-Carburizing Surface Modification on the Tribological and Adhesion Properties of Heat-Resistant KHR 45A Steel for Cracking Tubes

Effect of Irradiation and Temperature on Microstructural Characteristic of FeCrAl Alloys

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