Reheating cracking susceptibility in the weld heat-affected zone of a reduced activation ferritic-martensitic steel for fusion reactors

Moon, Joonoh; Lee, Jin-Jong; Lee, Chang‐Hoon; Park, Jun-Young; Lee, Tae‐Ho; Cho, Kyung-Mox; Hong, Hyun-Uk; Kim, Hyoung Chan

doi:10.1016/j.fusengdes.2017.04.040

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…Hattingh e Pienaar (1998) estudaram o efeito de Nb sobre propriedades mecânicas da ZAC e também usaram as equações de Rosenthal para simular os ciclos térmicos com calor imposto de 1,5, 3 e 6 kJ/mm. Moon et al (2017) avaliaram a susceptibilidade a trinca de reaquecimento na ZAC do aço ferriticomartensitico simulando fisicamente a ZAC resultante de uma solda com calor imposto de 3 kJ/mm, utilizando as equações do Rosenthal. Entretanto, nenhum desses pesquisadores atentou para também descriminar o ciclo de aquecimento.…”

Section: Parametrização De Ciclos Térmicos Usados Em Simulações Físicasunclassified

Uma visão holística da geração de tensões residuais em soldagem a arco e da medição por difração de raio X

Міщенко¹

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Thermal stresses caused by heating and non-uniform cooling of a small volume of metal give rise to residual stresses in welding. Residual stresses are one of the main problems related to the manufacture of metal components where welding processes are involved. Despite constant growth of computational techniques, there is still a need for experimental work aimed at establishing general principles of cause and effect relationship in the generation of residual stresses. However, there is great disagreement in the literature among experimental results. One of the likely reasons would be the difficulty of identifying and discretizing the effect of each variable that governs the phenomenon.The objective of the present work was to propose a methodological approach to be able to evaluate in an isolated way, but under a holistic view, the influence of the factors involved in the generation of residual stresses and then to make the own experimental evaluation of the same through the Diffraction of X-ray (XRD). Initially, a diagram was proposed to classify the factors that influence the generation of thermal stress at different levels (primary and secondary effects). Then, an original methodology to evaluate the influence of primary factors (heated metal volume and metallurgical transformation) on the generation of residual stresses was applied and evaluated. The whole process of measuring residual stresses by XRD was also systematically evaluated and a series of recommendations were proposed.The proposed methodology showed to be able to demonstrate that the welding energy is not a primary parameter, that is, able to govern directly the generation of residual stresses in steel evaluated. The systematic evaluation of the process of measurement of residual stresses by XRD has shown that it is necessary to quantify the previous state of the RT contained in the sheet before welding to obtain more reliable results, but this approach should only be done in regions where the metal heating is below its metallurgical transformation. In addition, it has been shown that sheet restraint influences the temporal evolution of residual stresses and that it is good practice to use a rigid fixation to ensure the quality of the results.

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Section: Parametrização De Ciclos Térmicos Usados Em Simulações Físicasunclassified

Uma visão holística da geração de tensões residuais em soldagem a arco e da medição por difração de raio X

Міщенко¹

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Reheating cracking susceptibility in the weld heat-affected zone of reduced activation ferritic-martensitic steels and the effect of Cr content

Moon

Lee

2020

Journal of Nuclear Materials

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PWHT Cracking Susceptibility in the HAZ of Martensitic 10Cr Steel for A-USC Power Plant

Kim¹,

Kang²,

Kim³

et al. 2019

Korean J. Met. Mater.

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In this study, the post-weld heat treatment (PWHT) cracking susceptibility in the heat affected zone (HAZ) of martensitic 10Cr steel was evaluated. The specimens taken from the 10Cr steel were thermally cycled using a Gleeble to simulate HAZ 1 (δ-ferrite) and HAZ 2 (single phase, γ). HAZ 2 had martensite and some M 23 C 6-type carbides were present. On the other hand, HAZ 1 had martensite and the carbides were completely dissolved. In addition, δ-ferrite is observed in HAZ 1. The simulated HAZ specimens were stress rupture tested at a temperature range of 688-788 o C under stress of 150-450 MPa (21, 750-65, 250 psi). After the stress rupture test, a stress rupture parameter (SRP) was obtained using the rupture strength and ductility. In this way, the PWHT cracking susceptibility was evaluated through the SRP. Both HAZ 1 and HAZ 2 tended to increase rupture strength with decreasing PWHT temperature, but with a decrease in ductility. Also, it was noteworthy that the HAZ 1 had a lower PWHT cracking susceptibility than the HAZ 2 due to its higher rupture strength, despite its lower ductility. Because the precipitation strengthening occurs due to reprecipitation of MC-type carbide during PWHT.

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Reheating cracking susceptibility in the weld heat-affected zone of a reduced activation ferritic-martensitic steel for fusion reactors

Cited by 3 publications

References 17 publications

Uma visão holística da geração de tensões residuais em soldagem a arco e da medição por difração de raio X

Uma visão holística da geração de tensões residuais em soldagem a arco e da medição por difração de raio X

Reheating cracking susceptibility in the weld heat-affected zone of reduced activation ferritic-martensitic steels and the effect of Cr content

PWHT Cracking Susceptibility in the HAZ of Martensitic 10Cr Steel for A-USC Power Plant

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