Caracterização de um aço AISI/SAE 4340 com diferentes microestruturas através da técnica de tríplice ataque

Barros, Renato Araujo; Abdalla, Antônio Jorge; Rodrigues, Humberto Lopes; Pereira, Marcelo dos Santos

doi:10.17563/rbav.v34i2.957

Cited by 2 publications

(2 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…After chemical etching using a 2% Nital reagent, the present phases displayed shades of gray. In Figures 4 and 5, it is possible to observe the material's microstructure, before and after coating process, respectively, consisting of a mixture of more resistant phases enriched with carbon (perlite, bainite, and martensite), a typical structure of AISI 4340 steel [31]. The microhardness of the coating was measured at ten different points along the center of the coating thickness, spanning horizontally across the cross-section.…”

Section: Microstructural Characterizationmentioning

confidence: 99%

Creep of High-Strength Steel Coated with Plasma Sprayed Self-Fluxing Alloy

Moraes

Almeida

Couto

et al. 2023

Metals

View full text Add to dashboard Cite

This article compares the creep testing behavior of AISI 4340 high-strength steel in the as-received and coated conditions. The coating material used is a NiCrBSi self-fluxing alloy. The microstructural characterization was carried out using optical and scanning electron microscopy. The creep tests were conducted at a temperature of 550 °C and with loads of 200, 250, and 300 MPa. The microstructure analysis of the deposited layer reveals some inclusions, very little porosity, and good adhesion to the substrate. The results of the creep tests indicated a decrease in the time to rupture under loads of 250 and 300 MPa for the coated steel. At a load of 200 MPa, the coated steel presents longer times to rupture and higher yield strength, demonstrating an improvement over the uncoated steel under these test condition. Fracture surface inspection showed a failure by a ductile fracture in both samples, with and without coating.

show abstract

Section: Microstructural Characterizationmentioning

confidence: 99%

Creep of High-Strength Steel Coated with Plasma Sprayed Self-Fluxing Alloy

Moraes

Almeida

Couto

et al. 2023

Metals

View full text Add to dashboard Cite

show abstract

“…São concebidos os microconstituintes conhecidos como ferrita, bainita, martensita e austenita em razão da utilização desses métodos. Esses diferentes microconstituintes possibilitam modificar as propriedades mecânicas finais dos materiais conforme as exigências do projeto (Anazawa et al, 2012;Barros, et al, 2015). Logo, o controle da temperatura do tratamento térmico aplicado no material é fundamental e determinante para alcançar as propriedades características desejadas (Abdalla et al, 2016).…”

Section: Introductionunclassified

Tratamento Térmico de Têmpera em Aço ABNT 8640: análise das Propriedades Mecânicas

Silveira

Zuchetto

Ruppenthal

et al. 2018

HOLOS

View full text Add to dashboard Cite

RESUMOCom a constante evolução tecnológica das indústrias, os materiais ferrosos, antes de sua utilização final, são submetidos a diferentes tratamentos térmicos para proporcionar melhores propriedades mecânicas e microestruturais que o material pode adquirir. Este procedimento pode ser verificado através de componentes mecânicos no qual a dureza é uma característica fundamental no projeto. Assim, para aumentar a dureza e a resistência do material, aplica--se o tratamento térmico de têmpera. Essa técnica consiste em aquecer o material acima da temperatura crítica do aço e resfriar em água ou óleo. O objetivo do presente estudo é analisar as propriedades mecânicas resultantes da realização do tratamento térmico de têmpera em corpos de prova de aço ABNT 8640 com o modo de resfriamento em água. Foram realizados ensaios de tração e de dureza em todas as amostras, além da análise microscópica. Comprovou--se que ocorreu o aumento da dureza nos corpos de prova, bem como a mudança estrutural dos tamanhos de grãos. Além disso, verificou--se que a têmpera, a partir de 1100°C, resulta na redução das propriedades mecânicas do aço ABNT 8640. ABSTRACTWith the constant technological evolution of the industries, the ferrous materials, before their final use, are submitted to different thermal treatments to provide better mechanical and microstructural properties that the material can acquire. This procedure can be verified through mechanical components in which hardness is a fundamental feature in the design. Thus, in order to increase the hardness and strength of the material, the quenching heat treatment is applied. This technique consists of heating the material above the critical temperature of the steel and cooling in water or oil. The aim of the present study is to analyze the mechanical properties resulting from the performance of the tempering heat treatment in ABNT 8640 steel test bodies with the cooling mode in water. Traction and hardness tests were performed in all samples, besides microscopic analysis. It was verified that the hardness increased in the specimens, as well as the structural change of the grain sizes. In addition, it has been found that annealing, starting at 1100°C, results in the reduction of the mechanical properties of ABNT 8640 steel.

show abstract

Caracterização de um aço AISI/SAE 4340 com diferentes microestruturas através da técnica de tríplice ataque

Cited by 2 publications

References 3 publications

Creep of High-Strength Steel Coated with Plasma Sprayed Self-Fluxing Alloy

Creep of High-Strength Steel Coated with Plasma Sprayed Self-Fluxing Alloy

Tratamento Térmico de Têmpera em Aço ABNT 8640: análise das Propriedades Mecânicas

Contact Info

Product

Resources

About