Investigation of Chill Performance in Steel Casting Process Using Response Surface Methodology

Kanthavel, K.; Arunkumar, K.; Vivek, S.

doi:10.1016/j.proeng.2014.12.256

Cited by 11 publications

(4 citation statements)

References 20 publications

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“…The heat dissipation that is released when there are a lot of friction with the machining tools. TEM [19][20] bright-field image analysis shows the matrix contains high deformations and defects (see Figure 5). It concentrates at matrixprecipitates grain boundary, which was due to internal stress during the precipitates formation.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 7 (a) shows the STEM-ADF image of the same precipitation of Figure 6. The spot diffraction (inset) is corresponding to Selected Area Electron Diffraction (SAED) pattern, which shows that the matrix identified as Fe0.8Cr0.8 phase [19][20][21]. Deviation on lattice parameters was also detected that indicate the possibility for silicon and manganese atoms substitution.…”

Section: Resultsmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

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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“…To produce a low-carbon austenitic alloy (Kanthavela et al, 2014), non-standard chemical compositions can be prepared in a laboratory-scale fabrication process using a casting method.…”

Section: A New Precipitation-hardened Austenitic Stainless Steel Invementioning

confidence: 99%

A New Precipitation Hardened Austenitic Stainless Steel Investigated by Electron Microscopy

Dani¹,

Dimiyati²,

Iskandar³

et al. 2018

IJTech

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The 56Fe16.6Cr25Ni0.9Si0.5Mn austenitic superalloy has been produced in an induction furnace; it was made from granular ferro-scrap, ferrochrome, ferrosilicon, and ferromanganese materials. Originally, this alloy had been proposed for use in high mechanical loads and high temperature conditions (such as in nuclear and fossil fuel power plant facilities). Tensile strength tests showed that the alloy has an average yield strength of about 430.56 MPa, which is higher than Incoloy A-286 (a commercially available alloy). A combination of microscopy techniques by means of an optical microscope, X-ray diffraction [XRD], scanning electron microscopy [SEM], and transmission electron microscopy [TEM] techniques were applied in order to get detailed information about the fine structure of the alloy. XRD confirmed that the alloy matrix exhibits an FCC crystal structure with a lattice parameter of about 3.60 Å and grain sizes ranging from 50 to 100 µm. The results of the TEM analysis revealed the new type of precipitations that formed at the grain boundaries. These needle-like precipitations, probably Fe/Cr-rich precipitations of the (Fe,Cr)xCy type, acted as the source of intergranular corrosion (IGC). Small coherent plate-like and much smaller granular precipitations were found distributed homogenously along grain boundaries and inside the grains. Combining the tensile strength test and microstructure analysis suggested that these precipitations play significant roles in the hardness of the investigated sample.

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“…Three material variants of chills were tested, material with high thermal conductivity, material with low thermal conductivity and material with intermediary thermal conductivity in relation to the two previous ones, as this parameter is crucial in this area of studies [4][5]. Table 1…”

Section: Chills Materials Variantsmentioning

confidence: 99%

Archives of Foundry Engineering

Jaromin¹,

Dojka²,

Jezierski³

et al. 2018

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The article is a case study of the steel milling ring casting of about 6 tonnes net weight. The casting has been cast in the steel foundry the authors have been cooperating with. The aim was to analyse the influence of the shape of the chills and the material which was used to make them on the casting crystallization process. To optimally design the chills the set of the computer simulation has been carried out with 3 chills' shape versions and 3 material's versions and the results have been compared with the technology being in use (no chills). The proposed chills were of different thermal conductivity from low to high. Their shapes were obviously dependant on the adjacent casting surface geometry but were the result of the attempt to optimise their effect with the minimum weight, too. The chills working efficiency was analysed jointly with the previously designed top feeders system. The following parameters have been chosen to compare their effectiveness and the crystallization process: time to complete solidification and so-called fed volume describing the casting feeding efficiency. The computer simulations have been carried out with use of MagmaSoft v. 5.2 software. Finally, the optimisation has led to 15% better steel yield thanks to 60% top feeders weight reduction and 40% shorter solidification time. The steel ring cast with use of such technology fulfil all quality criteria.

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Investigation of Chill Performance in Steel Casting Process Using Response Surface Methodology

Cited by 11 publications

References 20 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

A New Precipitation Hardened Austenitic Stainless Steel Investigated by Electron Microscopy

Archives of Foundry Engineering

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