Influence of Niobium Addition on Microstructure and Machinability of High Chromium Cast Iron

Silva, Anderson Edson da; Melo, Ismael Nogueira Rabelo de; Pinheiro, Ivete Peixoto; Silva, Leonardo Roberto da

doi:10.1590/1980-5373-mr-2020-0429

Cited by 5 publications

(2 citation statements)

References 33 publications

(57 reference statements)

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“…Several studies 5,[10][11][12][13] showed that small concentrations (less than 1%) of Nb can have a beneficial effect on the wear resistance of HCCI 6 . Furthermore, recent authors have shown that 0.5%Nb in HCCI addition can increase the material machinability at rates over 100% in some conditions 9,14 , encouraging interest in this range.…”

Section: Introductionmentioning

confidence: 97%

Influence of Niobium Adding on the Microstructure and Abrasive Wear Resistance of a Heat-Treated High-Chromium Near-Eutectic Cast Iron Alloy

et al. 2022

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High chromium cast iron (HCCI) with levels around 26% Cr -2.9% C according to ASTM A 532 IIIA is widely used in systems where high abrasive wear resistance is required. To evaluate the niobium influence, HCCI with 0.5% Nb and 1% Nb additions were melted, besides one without niobium addition of for comparison. For characterization, X-ray diffractometry, scanning electron microscopy (SEM), Vickers microhardness tests, Rockwell C hardness, carbide quantifications, quantification of the retained austenite by Mössbauer spectroscopy, and rubber wheel abrasion test according to procedure A of ASTM G-65 were performed. The results indicated a reduction in the average size, average perimeter, and carbides volumetric fraction (CVF) due to the addition of niobium, also changing the microstructure of the HCCI from eutectic to hypoeutectic. In some regions, NbC 0.75 carbides formed a coating around M 7 C 3 carbides. The 0.5% Nb alloy showed the best performance in the rubber wheel abrasive wear test, with a 37% average volume loss reduction as compared to the sample without niobium addition with a 130N load and 34% with a 45N load. The 0.5% Nb alloy also had the highest content of retained austenite among the investigated alloys.

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Section: Introductionmentioning

confidence: 97%

Influence of Niobium Adding on the Microstructure and Abrasive Wear Resistance of a Heat-Treated High-Chromium Near-Eutectic Cast Iron Alloy

et al. 2022

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“…The wear mechanisms associated with tool wear are categorized into abrasion, oxidation, attrition, and diffusion. A comprehensive analysis of wear mechanisms is very important for interpreting behavior and understanding the dynamic interaction between the tool and the chip [11].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Performance of a Pcbn Tool in Turning Aisi D2 Hardened Steel in Continuous and Interrupted Cutting

Dias,

Barroso,

Santos

2024

Preprint

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Important technological advances in the mechanical manufacturing industry have increasingly generated good results with the turning of hardened materials, using polycrystalline cubic boron nitride (PCBN) tools, mainly replacing abrasive processes. Tool steels play varied and essential roles in various industrial applications, such as dies and punches for forming and cutting. This work involves the evaluation the performance of a PCBN tool in turning quenched and tempered AISI D2 steel, both in continuous cutting and interrupted cutting conditions, in the finishing operation with dry machining. The surface roughness was evaluated in the parameters (Ra, Rt and Rz), the wear suffered by the tools, their mechanisms and morphological analysis of the chips. Tests were carried out with different cutting speeds (60, 130, 200 and 240 m/min), maintaining a constant feed rate of 0.15 mm/rev and a cutting depth of 0.2 mm. The results indicated that the most evident wear was crater and flank in the continuous cut, while in the interrupted cut there was the presence of chipping and catastrophic failure. Wear mechanisms, such as adhesion (attrition), abrasion and diffusion were prominently observed. Furthermore, the tests showed that the increase in flank wear did not necessarily result in an increase in surface roughness, and that the wear mechanism changed with the increase in cutting speed. In the continuous cutting condition, the tool achieved more satisfactory performance, especially at higher cutting speeds (130, 200 and 240 m/min). In interrupted cutting, there is a predominance of catastrophic failure mainly in the ranges of 60 and 130 m/min and better performance at 200 m/min within the ranges evaluated.

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Characterization and machinability of a high-silicon cast steel with ceramic and carbide tools

Barroso,

Dias,

do Carmo

et al. 2024

Int J Adv Manuf Technol

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Influence of Niobium Addition on Microstructure and Machinability of High Chromium Cast Iron

Cited by 5 publications

References 33 publications

Influence of Niobium Adding on the Microstructure and Abrasive Wear Resistance of a Heat-Treated High-Chromium Near-Eutectic Cast Iron Alloy

Influence of Niobium Adding on the Microstructure and Abrasive Wear Resistance of a Heat-Treated High-Chromium Near-Eutectic Cast Iron Alloy

Evaluation of the Performance of a Pcbn Tool in Turning Aisi D2 Hardened Steel in Continuous and Interrupted Cutting

Characterization and machinability of a high-silicon cast steel with ceramic and carbide tools

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