Microstructure and creep characteristics of dissimilar T91/TP316H martensitic/austenitic welded joint with Ni-based weld metal

Falat, Ladislav; Svoboda, Milan; Výrostková, A.; Petryshynets, Ivan; Sopko, Martin

doi:10.1016/j.matchar.2012.06.014

Cited by 50 publications

(11 citation statements)

References 35 publications

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“…The observed hardness peaks can be related to the highest level of transformation hardening in these regions due the maximal alloying effect in corresponding microstructures heated up to the highest peak temperatures during the welding thermal cycle [41]. Moreover, it has been shown in many studies, e.g.…”

Section: Mechanical Properties and Microstructure Evolutionmentioning

confidence: 71%

“…8). The coarsening rate of Laves phase is faster than that of M 23 C 6 carbides, and the finest MX particles seem to be thermally stable as their size and distribution do not un- dergo any significant changes during the long-term ageing process [23,24,40,41]. Figure 12 shows fracture surfaces of T24 HAZ and T92 HAZ regions of thermally exposed (600 • C/5000 h) and hydrogen charged weldments after room-temperature notch tensile tests.…”

Section: Fracture Behaviourmentioning

confidence: 99%

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Hydrogen pre-charging effects on the notch tensile properties and fracture behaviour of heat-affected zones of thermally aged welds between T24 and T92 creep-resistant steels

Falat¹,

Čiripová²,

Homolová³

et al. 2016

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The effects of thermal exposure at 600• C and subsequent electrolytic hydrogen charging at ambient temperature were studied in terms of their influence on notch-tensile properties and fracture behaviour of individual heat-affected zones (HAZ) of Ni-based transition weldments between T24 and T92 creep-resistant steels. The experimental welded joints were prepared by gas tungsten arc welding using "Inconel-type" filler metal Nirod 600. Post-weld heat treatment (PWHT) was carried out at 720• C for 2 h, followed by passive cooling within tempering furnace. Subsequent long-term ageing of two series of prepared T24/T92 dissimilar welds at 600• C for 1000 and 5000 h, respectively, led to gradual changes in both T24 and T92 HAZ microstructures, which were mainly related to their additional tempering accompanied by the coarsening of original precipitates as well as newly-formed secondary phases. The observed thermally-induced microstructural changes together with subsequently applied hydrogen charging effects resulted in complex variations in tensile properties and fracture behaviour of individual HAZ regions related to the pre-existing differences in their initial tempering grade due to the used PWHT procedure. K e y w o r d s : creep-resistant steels, dissimilar welding, isothermal ageing, hydrogen embrittlement, mechanical properties, fracture mechanisms

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Section: Mechanical Properties and Microstructure Evolutionmentioning

confidence: 71%

Section: Fracture Behaviourmentioning

confidence: 99%

Hydrogen pre-charging effects on the notch tensile properties and fracture behaviour of heat-affected zones of thermally aged welds between T24 and T92 creep-resistant steels

Falat¹,

Čiripová²,

Homolová³

et al. 2016

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show abstract

“…The summary of the material for investigations, including their steel grades, geometrical dimensions, working parameters, the current time of service and macrophotography of the test specimen is presented in Table 1. In the evaluation of these components, it is important and necessary to evaluate the condition of their material [7][8][9][10][11][12][13]. This evaluation is carried out based on non-destructive or destructive materials tests.…”

Section: Materials For Investigationsmentioning

confidence: 99%

“…For safety reasons, a particularly important issue to be solved is creep strength of the welded joints of the steam pipelines working under creep conditions [1][2][3][4][5][6]. In the evaluation of these components, it is important and necessary to evaluate the condition of their material [7][8][9][10][11][12][13]. This evaluation is carried out based on non-destructive or destructive materials tests.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Residual Life of Steam Pipeline Material beyond the Computational Working Time

Sroka

Zieliński

Dziuba-Kałuża

et al. 2017

Metals

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This paper presents the evaluation of durability for the material of repair welded joints made from (13HMF) 14MoV6-3 steel after long-term service, and from material in the as-received condition and after long-term service. Microstructure examinations using a scanning electron microscope, hardness measurements and creep tests of the basic material and welded joints of these steels were carried out. These tests enabled the time of further safe service of the examined repair welded joints to be determined in relation to the residual life of the materials. The evaluation of residual life and disposable life, and thus the estimation and determination of the time of safe service, is of great importance for the operation of components beyond the design service life. The obtained test results are part of the materials' characteristics developed by the Institute for Ferrous Metallurgy for steels and welded joints made from these steels to work under creep conditions.

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“…the exhaustion degree, based on changes in the microstructure of the analysed material, the examinations should be made by scanning electron microscopy with magnifications of up to 5 000x and suitable resolution of microstructure images. The evaluation of exhaustion degree of the examined materials based on nondestructive testing requires a database including the material characteristics of changes in the level of mechanical properties and residual creep strength with regard to the condition of microstructure [15][16][17][18]. It concerns not only the diagnostics of welded joints after long-term service, but above all the assessment of behaviour of the material and repair welded joints in the as-received condition with material after longterm service [19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

The Service Life of the Repair Welded Joint of Cr-Mo / Cr-Mo-V

Sroka¹,

Zieliński²,

Mikuła³

2016

Archives of Metallurgy and Materials

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This paper presents the evaluation of the service life of dissimilar repair welded joint from Cr-Mo/Cr-Mo-V steel after 200,000 h service under creep condition. The investigations of microstructure using scanning electron microscopy, investigations of mechanical properties at room and elevated temperature as well as creep tests of the basic material from Cr-Mo and Cr-Mo-V steel and welded joint from these steels were carried out. The investigations allowed the time of further safe operation of the repair welded joint in relation to the residual life of the materials to be determined. The evaluation of residual life and disposable residual life, and thus the estimation or determination of possible time of further safe operation, is crucial when the elements are operated much beyond the design work time.

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Microstructure and creep characteristics of dissimilar T91/TP316H martensitic/austenitic welded joint with Ni-based weld metal

Cited by 50 publications

References 35 publications

Hydrogen pre-charging effects on the notch tensile properties and fracture behaviour of heat-affected zones of thermally aged welds between T24 and T92 creep-resistant steels

Hydrogen pre-charging effects on the notch tensile properties and fracture behaviour of heat-affected zones of thermally aged welds between T24 and T92 creep-resistant steels

Assessment of the Residual Life of Steam Pipeline Material beyond the Computational Working Time

The Service Life of the Repair Welded Joint of Cr-Mo / Cr-Mo-V

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