Microstructure characteristics and mechanical properties of X80 pipeline steels

Zhou, Min; Du, Linxiu; Zhao, Yanfeng; Li, Xianghua

doi:10.1007/s11595-012-0447-x

Cited by 28 publications

(20 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Chai et al [9] reported that Mg addition into Ti-killed steel effectively improved the coarse-grained heat affected zone(CGHAZ) microstructure and impact toughness; they found Ti-Mg-O compound oxides are potent to nucleate an acicular ferrite, and single-phase MgO is impotent to nucleate an acicular ferrite. Zhu et al [10] also found that Mg could evidently increase the ratio of acicular ferrite crystals appearing at large angles boundaries to each other in HAZ of low carbon steels.…”

Section: Introductionmentioning

confidence: 91%

Effect of trace magnesium addition on the characteristics of mechanical properties in high strength low alloy steel

Lv¹,

Li²,

Min³

et al. 2015

Proceedings of the 5th International Conference on Advanced Design and Manufacturing Engineering

View full text Add to dashboard Cite

Abstract:In order to reveal the function of Mg on the characteristics of mechanical properties in high strength low alloy steel, the steels containing with different Mg contents were refined with vacuum induction furnace and rolled with double-stick reversible rolling mill. The characteristics of mechanical properties and rolled microstructure were systematically investigated in present study. The results show that, the yield and the tensile strengths increase with Mg content from 0.0008% to 0.0026%. The 0.0026%Mg addition makes the yield strength, tensile strength, and elongation of steel increase to 473MPa, 605MPa and 36.5%, increasing by 38MPa,70MPa, and 8% compared with the steel without Mg addition. The improved toughness is obtained both the transversal and longitudinal impact, and the increment in the Charpy impact toughness is also characterized to increase with the concentrations from 0.0008% to 0.0026%. The improved toughness and tensile of Mg-containing steels are attributed to both the refined microstructure and the bainite dominated microstructure in steel. Moreover, the bainitic structure obtained by the addition of Mg into the molten steel results in a continuous yield behavior emerges in 0.0026%Mg steel.

show abstract

Section: Introductionmentioning

confidence: 91%

Effect of trace magnesium addition on the characteristics of mechanical properties in high strength low alloy steel

Lv¹,

Li²,

Min³

et al. 2015

Proceedings of the 5th International Conference on Advanced Design and Manufacturing Engineering

View full text Add to dashboard Cite

show abstract

“…Este longo tempo em altas temperaturas, (maiores que 100 °C) provavelmente produziu um envelhecimento do metal, levando à alta resistência mecânica e baixa tenacidade, sendo que trabalhos [17][18][19] similares mencionam que é produzido neste caso elevada proporção de constituintes MA. Além disto, em um estudo [20] foi realizado tratamento térmico de reaquecimento do aço X80 em várias temperaturas após a laminação controlada com resfriamento acelerado.…”

Section: Imagens Do Mevunclassified

Efeitos da Taxa de Resfriamento na Soldagem do Aço API 5L-X80

et al. 2015

View full text Add to dashboard Cite

Este é um artigo publicado em acesso aberto (Open Access) sob a licença Creative Commons Attribution Non-Commercial, que permite uso, distribuição e reprodução em qualq'uer meio, sem restrições desde que sem fins comerciais e que o trabalho original seja corretamente citado. Resumo: Uma das principais razões para o desenvolvimento do aço API 5L-X80 foi seu uso em Regiões Polares, onde se faz necessário alta tenacidade em baixas temperaturas. Neste trabalho foi estudado o efeito da taxa de resfriamento na soldagem sobre as propriedades mecânicas e metalúrgicas deste tipo de aço. Estas diversas taxas de resfriamento simulam também diversas energias de soldagem. As diferentes taxas de resfriamento foram obtidas através de cinco distintos pré-aquecimentos. A temperatura de interpasse foi igual à temperatura de pré-aquecimento de cada uma das juntas em duplo V com face de raiz, sendo as soldagens robotizadas realizadas por arco elétrico com gás de proteção e eletrodo consumível ("Metal Active Gas" -MAG), arame maciço com resistência mecânica equivalente ("matching") ao metal base e gás de proteção composto de 75% Ar e 25% CO 2 . Para análise das juntas soldadas foram utilizados microscópio de luz e microscópio eletrônico de varredura (MEV), bem como ensaios mecânicos de tração, dobramento, impacto (Charpy-V) e dureza (Vickers). Os resultados dos testes mecânicos foram satisfatórios e apresentaram correlação com as análises metalúrgicas. As juntas apresentaram alta resistência ao impacto (Charpy-V) em temperaturas de teste de até -40 °C.Palavras Chave: Soldagem; API 5L-X80; Taxas de resfriamento; Propriedades mecânicas. Cooling Rate Effects in the Welding of API 5L-X80 SteelAbstract: One of the main reasons for the development of the API 5L-X80 steel was its utilization in Polar Areas where a relatively high toughness in low temperatures is needed. The present work aimed at studying the welding cooling rate effects on the mechanical and metallurgical properties of this type of steel. These various cooling rates also simulate various heat input's. These different cooling rates were obtained through five distinct pre-heatings. The interpass temperature was the same of the pre-heating temperature presented by each one of the double V joints with root face; being the robotics weldings itself performed through gas metal arc welding (GMAW), using solid wire with matching mechanical resistance, and as a shielding gas a mixture of 75% Ar and 25% CO 2 . In order to analyze the welded joints, light microscope and scanning electron microscope (SEM) were utilized, as well as mechanical tests, such as tension, bending, impact (Charpy-V) and hardness (Vickers). The results of such mechanical tests were satisfactory and suitable correlated with the metallurgical analyses. The joint presented a high Charpy-V impact resistance in testing temperatures up to -40 °C.

show abstract

“…Recently, Mg-bearing inclusion has attract much attention [2][3][4][5] and been applied in the new generation of oxide metallurgy. Compared with Ti-bearing oxides, besides inducing IAFs nucleation, Mg-bearing inclusions can also inhibit austenitic grain growth through pinning effect.…”

Section: Introductionmentioning

confidence: 99%

The Relationship between MnS Precipitation and Induced Nucleation Effect of Mg-Bearing Inclusion

Xiangshen

Zhu

Cai

et al. 2018

High Temperature Materials and Processes

View full text Add to dashboard Cite

The relationship between MnS precipitation and induced nucleation effect of Mg-bearing inclusion has been explored through scanning electron microscope and energy dispersive spectrometer (EDS). Results indicate that MnS prefers to precipitate on Mg-bearing inclusions. Statistical analysis suggests that MgAl2O4 and MgO may coexist in inclusion. After etching, it is found that Mg-bearing inclusions can induce the nucleation of intragranular acicular ferrites. Based on EDS line analysis and comparison with Al-Mn-Si-O inclusion in non-Mg-treated sample, this effect can be explained by Mn-depletion zone (MDZ), which is due to the vacancy property and crystal structure of MgAl2O4. In the same sample, similar induced nucleation effect and MDZ are not observed around pure MnS. This comparison implies that the formation of MDZ may be independent of MnS precipitation.

show abstract

Microstructure characteristics and mechanical properties of X80 pipeline steels

Cited by 28 publications

References 9 publications

Effect of trace magnesium addition on the characteristics of mechanical properties in high strength low alloy steel

Effect of trace magnesium addition on the characteristics of mechanical properties in high strength low alloy steel

Efeitos da Taxa de Resfriamento na Soldagem do Aço API 5L-X80

The Relationship between MnS Precipitation and Induced Nucleation Effect of Mg-Bearing Inclusion

Contact Info

Product

Resources

About