Effect of isothermal heat treatment on microstructure and mechanical properties of Reduced Activation Ferritic Martensitic steel

The microstructure of a 9Cr-1W-0.22V-0.09Ta-0.11C reduced activation ferritic/martensitic (RAFM) steel has been investigated after thermo-mechanical rolling with subsequent annealing for 30 min at temperatures of 880°C, 920°C, 980°C and 1050°C, followed by water quenching. Scanning and transmission electron microscopy investigations and electron backscattered diffraction (EBSD) measurements were performed to determine the microstructural features after the different thermal treatments. Additionally, the microstructure and the mechanical properties of the materials were studied after tempering at 750°C for 2 hours. This study aims to understand microstructural processes that occur in the material during thermo-mechanical treatment and to assess the effect of the microstructure on its strength and toughness, with a view on improving its

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“…The rapid austenitic grain growth at temperatures around 1050°C is in agreement with the observation of K.S. Chandravathi et al [29].…”

Section: Mechanical Testingsupporting

confidence: 92%

Effect of processing on microstructural features and mechanical properties of a reduced activation ferritic/martensitic EUROFER steel grade

Puype

Malerba

Wispelaere³

et al. 2017

Journal of Nuclear Materials

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“…The mechanical strength of these alloys closely correspond with the average interbarrier spacing to the moving dislocations which has been detailed in [14]. The inter-barrier spacing is governed by the complex nature of microstructural morphologies and characteristics: (a) spacing of inter-lath, (b) inter-particle spacing, and (c) dislocation network/ substructures etc, which have been reported elsewhere [17]. Strain hardening is the resistance to plastic flow of a material.…”

Section: Mechanics Of Materialssupporting

confidence: 62%

“…According to Vanaja et al [30], the EL and RA showed lower values in the intermediate temperature range, followed by a relatively rapid increase above 623 K (350 °C). The formation of finer martensite with smaller lath size and the fine precipitates formation that occured with increasing heat treatment temperatures above Ac 3 increased the strength of this steel, with the consequent decrease in ductility [17]. In the present study, it is worth mentioning that the Ac 3 temperature was not crossed during the tensile experiments.…”

Section: Mechanics Of Materialsmentioning

confidence: 66%

Fractographic correlations with mechanical properties in ferritic martensitic steels

Das¹,

Chakravartty²

2017

Surf. Topogr.: Metrol. Prop.

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The ultimate continuum of a material is nothing but the process called fracture. Fracture surface retains the imprint of the entire deformation history undergone in a material. Hence, it is possible to derive the approximate deformation and fracture properties of a material from a systematic fracture feature analysis. There has been large volume of literature available in the open domain correlating different mechanical and fracture responses of reduced activation ferritic martensitic grade steels under various testing conditions/circumstances with corresponding microstructural interpretation. There has been no such literature available to establish the relationship between the two-dimensional fracture geometry/topography with its corresponding deformation and mechanical properties of the material as a function of testing temperature, which has been the primary aim in the current investigation. A comprehensive literature survey has been carried out to realize this fact. In order to establish the above hypothesis, many tensile experiments were carried out at constant strain rate by systematic variation of the test temperature. The initial void volume fraction or the inclusion content of material was kept unaltered and the test temperature has been varied orderly on different multiple specimens to vary the deformation-induced nucleation sites of micro voids (i.e. different carbides, phase interfaces, dislocation pile up etc), which results in a change of fracture topography under uniaxial tensile deformation. A conventional metallographic technique followed by optical microscopy has been employed to understand the basic morphologies and characteristics of the alloy exposed at different temperatures. Fractographic investigation of the broken tensile specimens at various temperatures is carried out to measure the fracture features by using quantitative fractography on representative scanning electron fractographs through image processing.

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“…But the process proceeds with a decrease in temperature, and the range of 973-1182 K is unstable from the point of view of metal science. In heating for quenching and quenching, cracks, deformation and warping, decarburization, soft spots, and low hardness may occur [21].…”

Section: Resultsmentioning

confidence: 99%

Technology of hardening surfaces of working bodies by electromechanical processing

2023

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The article presents the results of research on technology development and substantiation of the modes of strengthening the working surfaces of earth-moving machines by the electromechanical method. The types of wear and the appearance of defects on the working surfaces of the part are analyzed, taking into account the operating conditions. Based on the conducted studies on the study of surface wear, the arithmetic mean values were determined using the example of a plowshare of a bulldozer blade. A technology for restoring a part with subsequent electromechanical hardening has been developed. The influence of processing modes on the surface hardness was studied, and using a multifactorial experiment, a regression equation was identified, and optimal hardening modes were substantiated.

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Effect of isothermal heat treatment on microstructure and mechanical properties of Reduced Activation Ferritic Martensitic steel

Cited by 26 publications

References 17 publications

Effect of processing on microstructural features and mechanical properties of a reduced activation ferritic/martensitic EUROFER steel grade

Effect of processing on microstructural features and mechanical properties of a reduced activation ferritic/martensitic EUROFER steel grade

Fractographic correlations with mechanical properties in ferritic martensitic steels

Technology of hardening surfaces of working bodies by electromechanical processing

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