Failure analysis of a 300M steel pressure vessel

Graça, M.L.A.; Hoó, Csaba; Silva, O.M.M.; Lourenço, N.J.

doi:10.1016/j.engfailanal.2008.02.003

Cited by 17 publications

(3 citation statements)

References 2 publications

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“…giving rise to the HE phenomenon [5]. A large number of catastrophic structural failures have been attributed to HE [6,7]. These kinds of failure occur under stress levels lower than the design stress; they are brittle in appearance-with minimum previous plastic deformation-and hence very difficult to predict.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen Diffusivity in Different Microstructures of 42CrMo4 Steel

Imdad¹,

Zafra²,

Arniella³

et al. 2021

Hydrogen

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It is well known that the presence of hydrogen decreases the mechanical properties of ferritic steels, giving rise to the phenomenon known as hydrogen embrittlement (HE). The sensitivity to HE increases with the strength of the steel due to the increase of its microstructural defects (hydrogen traps), which eventually increase hydrogen solubility and decrease hydrogen diffusivity in the steel. The aim of this work is to study hydrogen diffusivity in a 42CrMo4 steel submitted to different heat treatments—annealing, normalizing and quench and tempering—to obtain different microstructures, with a broad range of hardness levels. Electrochemical hydrogen permeation tests were performed in a modified Devanathan and Stachursky double-cell. The build-up transient methodology allowed the determination of the apparent hydrogen diffusion coefficient, Dapp, and assessment of its evolution during the progressive filling of the microstructural hydrogen traps. Consequently, the lattice hydrogen diffusion coefficient, DL, was determined. Optical and scanning electron microscopy (SEM) were employed to examine the steel microstructures in order to understand their interaction with hydrogen atoms. In general, the results show that the permeation parameters are strongly related to the steel hardness, being less affected by the type of microstructure.

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Section: Introductionmentioning

confidence: 99%

Hydrogen Diffusivity in Different Microstructures of 42CrMo4 Steel

Imdad¹,

Zafra²,

Arniella³

et al. 2021

Hydrogen

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“…O aço 300M foi desenvolvido como uma evolução tecnológica do aço 4340 e possui maior resistência à tração e excelente combinação entre resistência mecânica, tenacidade, resistência à fadiga e ductilidade, mostrando potencial para substituição do aço 4340 em muitas aplicações (3,4) . O aço 300M é basicamente uma modificação do aço SAE 4340 pelo teor de silício (tipicamente: 300M -1,60% Si; 4340 -0,27% Si) e pela introdução de vanádio, com teores de carbono e molibdênio ligeiramente superiores (5) . Seu maior teor de silício aumenta a profundidade de têmpera, aumenta o endurecimento por solução sólida e diminui a tendência ao amolecimento em temperaturas elevadas (6) .…”

Section: Introductionunclassified

Tratamento térmico e de superfície dos aços 4340 e 300M após soldagem a laser

Cardoso

Abdalla²,

Lima

et al. 2014

RBAV

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RESUMOO aço de médio carbono e baixa liga SAE 4340 vem passando por diversas modificações e neste processo de desenvolvimento surgiu o aço 300M. Estes aços são usados em condições severas onde são necessárias alta resistência e tenacidade. A compreensão da soldabilidade de aços alta resistência e baixa liga (ARBL) e aços de ultra-alta resistência tem sido objeto de especial interesse. O presente trabalho visa avaliar e comparar a microestrutura e a resistência mecânica em chapas de um aço 4340 e um aço de ultra-alta resistência 300M, após soldagem a laser e tratamentos: térmico de revenimento a 400ºC durante 2 horas e de superfície a plasma (nitretação) a 500ºC no período de 3 horas. Os resultados mostraram que o cordão de solda apresentou alta dureza e pequena zona termicamente afetada.Observou-se também que o aço 300M apresentou trincas na superfície após nitretação a plasma, levando à ruptura prematura dos corpos de prova, após este tratamento de superfície. Pôde-se concluir que a solda a laser e os tratamentos propostos para os aços 300M e 4340 são viáveis, com a manutenção das propriedades de tração em níveis elevados. Palavras-chave: ABSTRACTThe medium carbon-steel low-alloy SAE 4340 has undergone several modifications giving rise to the 300M steel. Both steels have been used in extreme conditions where high strength and toughness are needed. The understanding of the weldability of high-strength low-alloy steels and ultra-high strength steels has been the subject of particular interest. This study aims to evaluate and compare the microstructure and mechanical strength of class 4340 and 300M steel sheets after laser welding and heat treatment. Annealing was carried out at 400°C for 2 hours and surface plasma nitriding at 500ºC during 3 hours. The results showed welds with high hardness and small heat affected zones.It was also observed that 300M steel presented cracks at the surface after plasma nitriding, leading to premature rupture of the specimens. It was concluded that the laser welding and the treatments for the 300M and 4340 steels are viable, with retention of high tensile strength.

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“…With the development of military aircraft, a higher requirement to ultrahigh strength steel in the critical components is desired, which leads to ultrahigh strength with the properties of high toughness and improved resistance to stress-corrosion cracking [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Influence of Heat Treatment on Microstructure and Properties of Ultrahigh Strength Fe-Ni-Co Alloy

Zhong

2013

AMR

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The effect of temper temperature and duration on the microstructure and mechanical properties of new-type ultrahigh strength Fe-Ni-Co alloy was investigated with by mechanics performance testing and TEM. The results showed that the maximum ultimate tensile strength could reach 2230MPa after temper near 470°C due to the precipitation of coherent zones of fine carbides. With tempering time extended, the strength was cut down by the M2C carbides coarsening and the decreased coherency with matrix.

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Failure analysis of a 300M steel pressure vessel

Cited by 17 publications

References 2 publications

Hydrogen Diffusivity in Different Microstructures of 42CrMo4 Steel

Hydrogen Diffusivity in Different Microstructures of 42CrMo4 Steel

Tratamento térmico e de superfície dos aços 4340 e 300M após soldagem a laser

Influence of Heat Treatment on Microstructure and Properties of Ultrahigh Strength Fe-Ni-Co Alloy

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