Investigations of Temperatures of Phase Transformations of Low-Alloyed Reinforcing Steel within the Heat Treatment Temperature Range

Kargul, Tomasz

doi:10.1515/amm-2017-0131

Cited by 6 publications

(2 citation statements)

References 16 publications

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“…The stability of thermal properties for two types of commercial casting powders has been assessed with respect to registered mass changes, thermal effects, and evolved gas analysis, using a combination of TG/DTA/EGA simultaneous thermal analysis methods [15,16].…”

Section: Introductionmentioning

confidence: 99%

The analysis of gas evolved from casting powder during heating in the mold

Kargul

2019

J Therm Anal Calorim

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In this paper, the thermal stability of two commercial casting powders was assessed with respect to registered mass changes and evolved gas analysis using a combination of TG/DTA/EGA simultaneous thermal analysis methods. The experiments were conducted in a temperature range of 50 7 1300°C, in an oxidation atmosphere, with a heating rate of 10 K min-1. The results presented in the article perfectly fit into the research trend related to the emission of gases from powders, using for this purpose coupled TG/EGA techniques of thermal analysis. Thermogravimetric measurements together with simultaneous EGA analysis of gases released from the samples enable the identification of the main reactions responsible for mass disturbance. The main registered mass losses were associated with carbon oxidation and thermal decomposition of carbonates presented in investigated powders. Based on the DTA results, melting temperature, as well as other endo/ exothermal effects of reactions taking place in the system, was elaborated. The possibility of FactSage usage, to elucidate the influence of selected components on the viscosity of investigated casting powders, is also presented. On the basis of the conducted research, it was found that recorded mass disturbance was not associated with the evaporation of components affecting the viscosity of casting powder.

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Section: Introductionmentioning

confidence: 99%

The analysis of gas evolved from casting powder during heating in the mold

Kargul

2019

J Therm Anal Calorim

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“…The critical temperatures associated with phase transformations can be identified indirectly with dilatometry measurements 24,25 . Differential scanning calorimetry (DSC) can also be used with the added benefit of detecting the ferromagnetic ↔ paramagnetic transformation at the Curie temperature, T C 26–28 . The electromagnetic properties of steel are directly related to microstructure.…”

Section: Introductionmentioning

confidence: 99%

Local magnetic flux density measurements for temperature control of transient and non-homogeneous processing of steels

Sorger

Vilaça

Santos

2019

Sci Rep

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Measuring temperatures during high-temperature processing of steels is usually limited to surface measurements that cannot directly assess the internal temperature distribution. Here, we demonstrate the feasibility of using a magnetic flux density measurement system to assess transient and non-homogeneous temperature fields in a modern high-strength steel, within the intercritical temperature range where microstructural evolution defines their key mechanical properties. The system accurately detects the Curie temperature and distinguishes temperature change rates within the processed volume. The magnetic measurements are also sensitive to the volume above Curie temperature and its shape, as revealed when integrated with thermal computational simulations. The electromagnetic signal provides real-time qualitative and quantitative information relevant to the metallurgical conditions enabling future intelligent control systems for the production and processing of steels. Contactless measurements of temperature-dependent electromagnetic properties can enable through-thickness temperature monitoring solutions, opening up opportunities for non-destructive full-field imaging of steels during thermal and thermomechanical processing.

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Benchmark of Techniques for the Characterization of the Mechanism of Phase Transformations in Steel of Near-Peritectic Composition

Kargul,

Moon,

Dippenaar

2024

Metall Mater Trans A

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This study addresses challenges in elucidating the mechanism of phase transformations occurring in steel of near-peritectic composition. The importance of using and integrating, complementary experimental techniques is emphasized. While thermal analysis tools such as Differential Scanning Calorimetry (DSC) and Differential Thermal Analysis (DTA) are vital, they offer limited insight on events occurring during cooling. Employing standard thermal analysis (DSC) alongside high-temperature microscopy, incorporating simultaneous thermal analysis within a high-temperature microscope, and concentric solidification, two of steels of near-peritectic composition were investigated. Key findings include the correlation between heating rates and completion temperatures of phase transformation in the DSC heating experiments; absence of a peritectic transition inferred from DSC cooling curves supported by visual observation, and insights into restricted austenite phase nucleation attributed to diffusional constraint and limited nucleation sites. This investigation not only contributes to understanding phase transformation behaviour in peritectic steels, but more generally provides a framework for utilizing different techniques synergistically to address complexities in the interpretation of the mechanism of phase development.

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Investigations of Temperatures of Phase Transformations of Low-Alloyed Reinforcing Steel within the Heat Treatment Temperature Range

Cited by 6 publications

References 16 publications

The analysis of gas evolved from casting powder during heating in the mold

The analysis of gas evolved from casting powder during heating in the mold

Local magnetic flux density measurements for temperature control of transient and non-homogeneous processing of steels

Benchmark of Techniques for the Characterization of the Mechanism of Phase Transformations in Steel of Near-Peritectic Composition

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