Precipitation and Grain Size Effects on the Tensile Strain-Hardening Exponents of an API X80 Steel Pipe after High-Frequency Hot-Induction Bending

Silva, Rafael Á.; Pinto, André Luiz; Kuznetsov, Alexei; Bott, Ivaní de Souza

doi:10.3390/met8030168

Cited by 39 publications

(23 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In this context, knowledge of the microstructural and mechanical properties of such materials, as well as the development of accurate design and inspection methodologies is of major importance. Lavigne et al [4] present a comprehensive study of the microstructural and mechanical characterization of API 5L X52 steel; Silva et al [5] discuss the effect of precipitation and grain size on the tensile strain-hardening exponent of API X80 steel; Liu et al [6] analyze the local buckling behavior and plastic deformation capacity of high-strength X80 steel pipelines subjected to strike-slip fault displacements; and Vilkys et al [7] study the influence of mechanical surface defects on the safe operation of gas pipelines on the basis of fragments collected from operating parts.…”

Section: Contributionsmentioning

confidence: 99%

Mechanical Behavior of High-Strength, Low-Alloy Steels

Branco

Berto

2018

Metals

View full text Add to dashboard Cite

show abstract

Section: Contributionsmentioning

confidence: 99%

Mechanical Behavior of High-Strength, Low-Alloy Steels

Branco

Berto

2018

Metals

View full text Add to dashboard Cite

show abstract

“…The logarithm of the plastic part in formula (1) is as follows 14,30 ln s = ln R + nln e ð4Þ Therefore, the hardening index, n can be calculated by formula (5)…”

Section: Resultsmentioning

confidence: 99%

“…To avoid the size effect, the nanoindentation displacement cannot exceed the thickness of a metallographic structure. 13,14 To avoid the influence of roughness effect, the depth of the compression cannot be too small. 15,16 Therefore, 20 mN is selected as the nanoindentation force, under which the metallographic structure performance should be fully reflected.…”

Section: Methodsmentioning

confidence: 99%

In situ nanoindentation method for characterizing tensile properties of AISI 1045 steel based on mesomechanical analysis

Zhao

Sun

et al. 2019

Advances in Mechanical Engineering

View full text Add to dashboard Cite

A novel method for characterizing the tensile properties of AISI 1045 steel is proposed by combining the method of in situ nanoindentation test and the theory of mesomechanical analysis. First, the load–depth curves of exact location of ferrite, pearlite and grain boundary on the surface of AISI 1045 steel are obtained by 30 groups of in situ nanoindentation tests. The constitutive equation (stress–strain function) of the real-time metallographic structure is obtained by nanoindentation analysis of the above curves. Then, based on the principle of mesomechanical analysis, the computational representative volume element models are reconstructed according to the three metallographic images of AISI 1045 steel surface collected by the test equipment. Finally, taking the constitutive equation of the real-time metallographic structure as the input condition, the finite element analysis of the above representative volume element models are carried out. The data resulted from finite element analysis are taken as the tensile mechanical properties of AISI 1045 steel. The elastic modulus of AISI 1045 steel calculated is as the same as that by the traditional nanoindentation method. And, the error is less than 6% compared with the tensile test, which is within the range of the elastic modulus of the material. The error between the yield strength calculated and tensile test results is 3.4%. Due to the influence of surface cracks on the plastic deformation ability of AISI 1045 steel during tension, the error between the strain hardening index calculated and tensile test results is 7.4%. The results show that it is a more accurate nondestructive testing method in the point of material damage mechanism. On the premise of using more accurate representative volume element modelling way, this method is suitable for testing more materials.

show abstract

“…Apenas a título de curiosidade, a Figura 37 traz os resultados de uma simulação numérica similar para o corpo de prova Charpy, e neste caso nota-se que em torno de apenas 14 J (aproximadamente 4%), de um total de 350 J, destina-se à propagação estável. Moço (2017) ainda conduziu uma análise empregando a mesma metodologia em um anel de duto, desta vez analisando o campo residual de deformações, e como resultado verificou-se que 72% da energia total absorvida pelo duto estava relacionada ao processo de propagação de fratura dúctil. Portanto, apesar de atualmente os espécimes Charpy e DWTT serem considerados como representativos da fratura dúctil de dutos, o uso de ambas as geometrias vem se mostrando insatisfatório para estes fins, haja visto os resultados obtidos por Moço (2017) e pelos demais autores referenciados.…”

Section: Ctod ()unclassified

“…Neste sentido, e de um ponto de vista de engenharia, alguns modelos para previsão de falha em gasodutos, propostos no passado, deixaram de aderir à fenomenologia ocorrente nos materiais atuais, contribuindo para a perda de similitude entre os corpos de prova (Charpy V-Notch) e estruturas reais. Desta maneira, as pesquisas de Moço (2017) e Pereira (2017) disponibilizaram boas práticas de simulação de corpos de prova de impacto e gasodutos, para compreensão do fenômeno de propagação de trincas em materiais de alta tenacidade sob uma perspectiva da resposta carga-deslocamento e de energia. Contudo, um estudo mais detalhado se faz necessário, além de ensaios experimentais para fins de validação numérica e identificação das variáveis mecânicas e microestruturais que impactam diretamente no crack arrest.…”

Section: Introductionunclassified

Avaliação numérico-experimental do comportamento mecânico de aços API X80 e investigação das variáveis mecânicas e microestruturais envolvidas no crack arrest

Silva¹

View full text Add to dashboard Cite

Despite employing modern high toughness structural steels (API grade) in pipelines, it remains the need of predicting ductile fracture phenomena that can trigger cracks in velocities up to 500 m/s and result in significant damage to society. In this sense, and from an engineering point of view, some models for pipelines failure prediction proposed in the past no longer represent the phenomenology occurring in the current materials, contributing for the loss of similitude between the specimens (Charpy V-Notch) and real structures. Thus, the researches of Moço (2017) and Pereira (2017) have provided good practices in impact specimens and pipes simulations, for the comprehension of the crack propagation phenomena in high toughness materials, by means of load-displacement response and also an energetics perspective. Nevertheless, a deeper study is necessary, in addition to experimental tests for numerical validation and identification of mechanical and microstructural variables that directly influence in crack arrest. In this scenario, this research was conceived, including the whole experimental characterization by means of tensile and instrumented Charpy mechanical tests of API X80 steel plates, in addition to preliminaries DWTT tests, all of them followed by numerical reproduction employing GTN damage model to understand the phenomena. Moreover, despite the structuring nature of this research, the results of the experimental analyses have already briefly oriented the investigation regarding to the variables that play a role in these materials' crack arrest, as the occurrence of delaminations in the cases where the arrest didn't take place. Therefore, this work has stablished a solid base for the continuity of the energetics investigations involving the crack propagation phenomenon in high toughness steels (from the proposals made by Moço (2017) and Pereira (2017)), as the identification of the mechanical and microstructural variables that play a role in crack arrest.

show abstract

Precipitation and Grain Size Effects on the Tensile Strain-Hardening Exponents of an API X80 Steel Pipe after High-Frequency Hot-Induction Bending

Cited by 39 publications

References 18 publications

Mechanical Behavior of High-Strength, Low-Alloy Steels

Mechanical Behavior of High-Strength, Low-Alloy Steels

In situ nanoindentation method for characterizing tensile properties of AISI 1045 steel based on mesomechanical analysis

Avaliação numérico-experimental do comportamento mecânico de aços API X80 e investigação das variáveis mecânicas e microestruturais envolvidas no crack arrest

Contact Info

Product

Resources

About