The effect of variation of microstructure on fracture mechanics parameters of HSLA-100 steel

Das, Swapan Kumar; Sivaprasad, Sobha; Chatterjee, S.; Tarafder, S.

doi:10.1016/j.msea.2006.05.093

Cited by 42 publications

(24 citation statements)

References 12 publications

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“…The size, shape, distribution, and coherency of copper precipitates are also altered through the aging treatments so that their participation in the deformation and fracture processes can be engineered. [33][34][35] The mechanical properties of the variously aged condition have been determined through tensile tests, and typical metrics (i.e., dimple size, density, and distribution) of coalesced microvoids on tensile fracture surfaces have been obtained through image processing of representative fractographs to ascertain the existence of correspondence between the events of deformation and fracture.…”

Section: Introductionmentioning

confidence: 99%

Correlation of Fractographic Features with Mechanical Properties in Systematically Varied Microstructures of Cu-Strengthened High-Strength Low-Alloy Steel

Das

Tarafder

2009

Metall Mater Trans A

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Fracture is often the culmination of continued deformation. Therefore, it is probable that a fracture surface may contain an imprint of the deformation processes that were operative. In this study, the deformation behavior of copper-strengthened high-strength low-alloy (HSLA) 100 steel has been investigated. Systematic variation of the microstructure has been introduced in the steel through various aging treatments. Due to aging, the coherency, size, shape, and distribution of the copper precipitates were changed, while those of inclusions, carbides, and carbonitrides were kept unaltered. Two-dimensional dimple morphologies, quantified from tensile fracture surfaces, have been correlated to the nature of the variation of the deformation parameters with aging treatment.

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Section: Introductionmentioning

confidence: 99%

Correlation of Fractographic Features with Mechanical Properties in Systematically Varied Microstructures of Cu-Strengthened High-Strength Low-Alloy Steel

Das

Tarafder

2009

Metall Mater Trans A

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“…Este comportamento melhorado em aços modificados por micro-adição de elementos de liga foi observado nos trabalhos de Robles Hernández [3], Najafi, Rassizadehghani e Norouzi [4], Hajisafari, M. e Nategh, S. [5] e Oliveira [6]. Também foi verificada uma diminuição no tamanho de grão austenítico devido à micro adição de Nióbio e Molibdênio, o que segundo Das [7] aumenta a tenacidade à fratura do material já que quanto menor o tamanho de grão maior a dificuldade da trinca se propagar. Sabe-se que além do material, o tipo de processo de fabricação também é importante.…”

Section: Introductionunclassified

Análise De Propriedades E Mecânica Da Fratura De Rodas Ferroviárias Microligadas Fundidas E Forjadas

Freitas¹,

Vieira²,

Minicucci³

2018

ABM Proceedings

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ResumoComponentes de alto custo como rodas ferroviárias estão em pleno desenvolvimento a fim de aumentar o desempenho em operação. Para isso, diversos materiais microligados têm sido testados para obter melhores propriedades mecânicas e metalúrgicas. Esses materiais estão fortemente sujeitos a fraturas devido às solicitações térmicas e mecânicas durante o trabalho. Muitas dessas fraturas frágeis são ocasionadas por propagação de trinca, impacto, fadiga ou alguma falha metalúrgica. Essas fraturas e riscos operacionais vêm aumentando gradativamente com as maiores cargas transportadas. Portanto, novos materiais e processos produtivos devem ser exaustivamente testados a fim de garantir alto desempenho e confiabilidade. O objetivo deste trabalho é avaliar as propriedades dos materiais atuais e de diferentes composições de aços microligados de rodas ferroviárias de vagões, fabricadas pelos processos de fundição e forjamento. As amostras foram submetidas a ensaios metalográficos, mecânicos e de tenacidade à fratura. Foram avaliadas rodas convencionais, microligadas ao vanádio e microligadas ao nióbio. Nas rodas forjada e fundida, foram observadas propriedades de tração e dureza similares, e superioridade para o microligado em relação ao aço convencional. As rodas forjadas apresentaram melhor resistência ao impacto e a tenacidade a fratura, destacando-se a microligada ao nióbio. Palavras-chave: Rodas ferroviárias; Processos de fabricação; Aço microligado; Alto desempenho. ANALYSIS OF PROPERTIES AND FRACTURE MECHANICS OF RAILWAY WHEELS MICROALLOYED OF FORGING AND CASTING PROCESSES AbstractHigh cost components such as railway wheels are being developed to increase the performance in operation. For this, various materials have been tested micro-alloyed for improved mechanical and metallurgical properties. These materials are strongly subject to fractures due to thermal and mechanical stress at work. Many of these fragile fractures are caused by fatigue or some metallurgical failure. These fractures and operational risks are increasing gradually with the largest cargo transported. Therefore, new materials and production processes must be thoroughly tested to ensure high performance and reliability of the components. The objective of this study is to evaluate the results of the properties of different compositions of microalloyed steel railway wheels of cars manufactured by different processes. The micro-alloy steels were developed and tested by manufacturers of casting and forging processes. The samples were subjected to mechanical testing and fracture mechanics. Were compared to conventional wheels microligadas the vanadium and niobium microligadas. In forged and cast wheels, tensile properties were observed and similar hardness, and superiority to the microalloyed compared to conventional steel. Forged wheels showed better impact resistance and fracture toughness, highlighting the microligada the niobium.

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“…Moreover, to ensure structural integrity, the sensitivity of HSLA-100 steel mechanical behavior to manufacturing processes and microstructure has to be well characterized. For the latter, Das et al [4] and Dhua et al [5,6] conducted mechanical and electron microscopy studies to address the coupling between microstructure, processing, manufacturing techniques and mechanical properties. Similarly but aiming toward higher strain rates, Xue et al [7] investigated the dynamic tensile response of HSLA-100 steel near weld zones at strain rates ranging from quasi-static to dynamic (10 3 s À1 ) regimes.…”

Section: Introductionmentioning

confidence: 99%

Large Strain Mechanical Behavior of HSLA-100 Steel Over a Wide Range of Strain Rates

Alkhader

Bodelot

2011

Journal of Engineering Materials and Technology

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High-strength low alloy steels (HSLA) have been designed to replace high-yield (HY) strength steels in naval applications involving impact loading as the latter, which contain more carbon, require complicated welding processes. The critical role of HSLA-100 steel requires achieving an accurate understanding of its behavior under dynamic loading. Accordingly, in this paper, we experimentally investigate its behavior, establish a model for its constitutive response at high-strain rates, and discuss its dynamic failure mode. The large strain and high-strain-rate mechanical constitutive behavior of high strength low alloy steel HSLA-100 is experimentally characterized over a wide range of strain rates, ranging from 10 À3 s À1 to 10 4 s À1. The ability of HSLA-100 steel to store energy of cold work in adiabatic conditions is assessed through the direct measurement of the fraction of plastic energy converted into heat. The susceptibility of HSLA-100 steel to failure due to the formation and development of adiabatic shear bands (ASB) is investigated from two perspectives, the well-accepted failure strain criterion and the newly suggested plastic energy criterion [1]. Our experimental results show that HSLA-100 steel has apparent strain rate sensitivity at rates exceeding 3000 s À1 and has minimal ability to store energy of cold work at high deformation rate. In addition, both strain based and energy based failure criteria are effective in describing the propensity of HSLA-100 steel to dynamic failure (adiabatic shear band). Finally, we use the experimental results to determine constants for a Johnson-Cook model describing the constitutive response of HSLA-100. The implementation of this model in a commercial finite element code gives predictions capturing properly the observed experimental behavior. High-strain rate, thermomechanical processes, constitutive behavior, failure, finite elements, Kolsky bar, HSLA-100.

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The effect of variation of microstructure on fracture mechanics parameters of HSLA-100 steel

Cited by 42 publications

References 12 publications

Correlation of Fractographic Features with Mechanical Properties in Systematically Varied Microstructures of Cu-Strengthened High-Strength Low-Alloy Steel

Correlation of Fractographic Features with Mechanical Properties in Systematically Varied Microstructures of Cu-Strengthened High-Strength Low-Alloy Steel

Análise De Propriedades E Mecânica Da Fratura De Rodas Ferroviárias Microligadas Fundidas E Forjadas

Large Strain Mechanical Behavior of HSLA-100 Steel Over a Wide Range of Strain Rates

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