Effect of P and Si on creep induced precipitation in 20% CW Ti-modified 14Cr-15Ni stainless steel fast reactor clad

Latha, S.; Nandagopal, M.; Reddy, G.V. Prasad

doi:10.1016/j.msea.2019.05.090

Cited by 10 publications

(2 citation statements)

References 20 publications

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“…Therefore, phosphorus appears to be among alloying elements, and its positive effect as an alloying element in low carbon steel has been known for a long time. For instance, phosphorus content of 0.025% in 14 Cr-15 Ni steel contributes to a significant increase in the creep strength of the alloy [1].…”

Section: Introductionmentioning

confidence: 99%

Research into phosphate mineral composition and waste phosphorite ore

Proidak¹,

Gasyk²,

Proidak³

2021

Min. miner. depos.

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Purpose. Theoretical and experimental studies of chemical and mineral composition and the structure peculiarities of phosphorites from Ukrainian deposits to define the degree of their suitability for other industries. Methods. The ore chemical composition was determined by conventional (wet) analysis using standard certified chemical reagents. The mineral composition was studied on the scanning electron microscope equipped with the attachment for the energy-dispersive electron microprobe analysis (EMPA) with the software for calculating the chemical composition of the studied sample microvolume. The petrographic analysis was carried out by the traditional methods of microscopic section preparation with subsequent identification and description of the minerals. The microscopic study of the original ore samples aimed at their mineral composition determination was conducted on the Nu optical microscope (Germany) both in transmitted and reflected light. The thin and polished sections prepared using the standard technology were used as samples. In the laboratory environment, the phosphorites were subjected to magnetic dressing in magnetic fields with different intensity. The experiments in the weak field were modelled with the help of the magnetic analyzer while the experiments in the strong magnetic field were modelled on the rotor separator. The flotation dressing method was studied on the laboratory mechanical flotation machine. Findings. It was found that phosphate nodules are rounded mineral formations of irregular shape; they consist of sand bound with the yellow-brown phosphate cement. Ore useful substance is a phosphorus-bearing mineral that by the element chemical composition corresponds to fluorocarbon-hydroxyl-apatite with the dominant content of Ca (45.23%), P (15.67%), and B (27.87%). The results of the integrated petrographic study of the phosphorite samples from the ore body of “Peremoha” area are presented. Originality.The study has revealed that phosphorus-containing substance in the phosphorite samples is the mass that cements barren minerals (mainly quartz, glauconite, calcite and plagioclase). Practical implications. According to the phosphate content level, the phosphorites from Malokamyshevatske, Iziumske and Sinichino-Yaremovske deposits can be treated as minerals for ferrophosphorus smelting. Keywords: ferrophosphorus, ore substance, phosphorite, mineral varieties, petrography, apatite

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Section: Introductionmentioning

confidence: 99%

Research into phosphate mineral composition and waste phosphorite ore

Proidak¹,

Gasyk²,

Proidak³

2021

Min. miner. depos.

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“…They are also commonly exposed to the systems having both mechanical and corrosion wear phenomena [44][45][46][47][48]. Most importantly, they must operate at elevated temperatures for a long time without thermal fatigue [49] and creep [50] failures.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Investigations of ASTM A36 Welded Steels with Stainless Steel Cladding

Preedawiphat

Mahayotsanun

Sa-ngoen³

et al. 2020

Coatings

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The in-service life of ASTM A36 welded steel pipes in power plants is often shortened by ash corrosion. During the heating condition, the ash deposition on the welded steel pipes gradually reduces the thickness of the pipes, thus, reducing the lifetime. Instead of replacing the pipes with new ones, the cost could be significantly reduced if the lifetime could be further extended. Weld cladding was the method selected in this study to temporarily extend the service life of welded pipes. This paper performed the mechanical investigations of A36—A36 welded steel plates after coating the surfaces with 309L stainless steel with a cladding method. The residual stress was also tested to observe the internal stresses developed during the welding processes of A36—A36 specimens. The comparison between the coated and non-coated surfaces of welded steels was performed by using the tensile tests (at room and elevated temperatures), corrosion (pitting corrosion, intergranular corrosion, and weight-loss corrosion) tests, and wear (shot blasting) tests. The life-extension of both coatings was evaluated based on the tensile tests and the corrosion and wear tests provided the qualitative evaluations of the coating performance. The results showed that surfaces coated by cladding could be used to temporarily extend the life of ASTM A36 welded steel under the studied conditions.

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Beneficial role of short-term aging on creep performance of cold-worked Ti-added 14Cr–15Ni stainless steel

Vijayanand,

Ruban,

Sivapirakasam

et al. 2024

J Mater Sci

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The initial microstructure of cold-worked Ti-added 14Cr–15Ni stainless steel was modified through short-term aging and its influence on creep properties has been investigated at a test temperature of 973 K and two stress levels of 150 and 175 MPa. The improvement in rupture life of the condition comprising of post-aging was nominal at 175 MPa, but enhanced more than two times at 150 MPa when compared to the condition which comprised of prior cold work alone. Microstructural examination after creep testing showed that though M23C6 type of precipitates was prominent in both conditions, their size distribution varied with respect to processing condition (viz., one with prior cold work and another comprising of prior cold work followed by aging) as well as applied stress. Retention of cold work-induced dislocation structures aided by secondary TiC precipitates in the aged condition enhanced the rupture life at 150 MPa. Extensive recovery of the dislocation substructure was observed in the unaged condition tested at the same stress level. The size distribution of the dimples observed from the fractographs could be correlated with the extent of creep-induced cavitation. This work describes how the two preprocessing conditions influence the nucleation of M23C6 and secondary TiC precipitates during creep deformation. Graphical Abstract

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Effect of P and Si on creep induced precipitation in 20% CW Ti-modified 14Cr-15Ni stainless steel fast reactor clad

Cited by 10 publications

References 20 publications

Research into phosphate mineral composition and waste phosphorite ore

Research into phosphate mineral composition and waste phosphorite ore

Mechanical Investigations of ASTM A36 Welded Steels with Stainless Steel Cladding

Beneficial role of short-term aging on creep performance of cold-worked Ti-added 14Cr–15Ni stainless steel

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