Experimental study on creep damage evolution process of Type IV cracking in 9Cr–0.5Mo–1.8W–VNb steel welded joint

Zhao, Lei; Jing, Hongyang; Han, Yongdian; Xiu, Junjie

doi:10.1016/j.engfailanal.2011.09.003

Cited by 33 publications

(15 citation statements)

References 19 publications

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“…Figure 5 shows the detailed microstructure of the T92 region of the investigated weldment formed of homogenized and tempered martensite, typically consisting of tempered martensitic laths inside the blocks and packets structures within prior austenitic grains. In accordance with numerous research studies focused on normalized and tempered grade 92 steels (e.g., [6][7][8][9][10][11][23][24][25]), the phase composition of the T92 steel region of the investigated weldment in its initial QT PWHT condition consists of ferrite matrix and secondary phase precipitates, namely intergranular M 23 C 6 (M = Cr, Fe, . .…”

Section: Methodssupporting

confidence: 62%

Ageing Effects on Room-Temperature Tensile Properties and Fracture Behavior of Quenched and Tempered T92/TP316H Dissimilar Welded Joints with Ni-Based Weld Metal

Čiripová

Falat

Ševc

et al. 2018

Metals

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The present work is focused on the investigation of isothermal ageing effects on room-temperature tensile properties and the failure of quenched and tempered martensitic/austenitic weldments between T92 and TP316H heat-resistant steels. The dissimilar weldments were produced by gas tungsten arc welding technique using a Ni-based Thermanit Nicro 82 filler metal. The welded joints were subjected to unconventional post-welding heat treatment consisting of the welds solutionizing (1060 °C/30 min), followed by their water quenching and final stabilization tempering (760 °C/60 min). The treatment was completed by spontaneous air cooling within a tempering furnace. The welds in their initial quenched and tempered condition were subsequently aged at 620 °C for up to 2500 h. Apart from room-temperature tensile tests performed for all the welds material states, additional cross-weld hardness measurements were carried out on longitudinal sections of broken tensile specimens. The applied thermal exposure resulted in recognizable deterioration of plastic properties, whereas their effects on strength properties were rather small. The welds tensile straining and fracture evolution exhibited competitive behavior between the austenitic TP316H region and Ni-based weld metal. The observed failure locations showed significant hardness peaks due to intensive, necking-related strain hardening effects occurred during the tensile tests.

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Section: Methodssupporting

confidence: 62%

Ageing Effects on Room-Temperature Tensile Properties and Fracture Behavior of Quenched and Tempered T92/TP316H Dissimilar Welded Joints with Ni-Based Weld Metal

Čiripová

Falat

Ševc

et al. 2018

Metals

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“…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%

“…The most significant microstructural change in Grade 92 steels during their long-term ageing and/or creep exposure is the additional precipitation of intermetallic Fe 2 (W, Mo) based Laves phase, typically in the vicinity of M 23 C 6 carbides [19][20][21][22][23][24].…”

Section: Introductionmentioning

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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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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“…Pētījumos [11] par plaisu veidošanos metinājumu šuvju tuvumā 1. tabulā uzrādītajiem pamatmetāla un metināšanai izmantotā tērauda ķīmisko elementu sastāviem ir noteikts, ka, īslaicīgi karsējot 1313K 4 stundas un papildus 2 stundas, ilgstoši karsējot 923K 3000, 4000 un 7000 stundas, un nemainīgā spiedienā, sīkās karbīdu daļiņas kļūst rupjgraudainākas, palielinās to daudzums tēraudā metinājuma šuves tā saucamajā pārkaršanas zonā. Konstatēta karbīdu veidošanās uz graudu robežvirsmām, kas savukārt izraisa tukšumu un vakanču veidošanos graudos.…”

Section: Ievadsunclassified

“…Salīdzinājumā ar citu autoru iegūtajiem rezultātiem, pētot sakausējumus ar līdzīgu ķīmisko elementu sastāvu [10,11], mūsu pētījumu novitāte ir detalizēti izsekotas ķīmisko elementu un fāžu sastāva izmaiņas dzelzs sakausējumos atbilstoši mikroskopijas attēlos redzamajām struktūru izmaiņām, kas deva iespēju noteikt ne tikai karbīdu, bet papildus arī Ni, Cr, Fe, Si ķīmisko un intermetalītisko savienojumu veidošanos atkarībā no sakausējuma elementu sastāva.…”

unclassified

Intermetalītisko – ķīmisko savienojumu veidošanās un to izraisītās metālu sakausējumu struktūru izmaiņas atkarībā no to ķīmisko elementu sastāva

Vītiņa

Krūmiņa

Belmane

2014

Material Science and Applied Chemistry

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RTU Neorganiskās ķīmijas institūtsKopsavilkums. Intermetalīdu un ķīmisko savienojumu veidošanās, to klātbūtne rūpnieciskos izstrādājumos, kā metālu lūšanas cēlonis dzelzs un vara-cinka sakausējumos, pētīta, nosakot ķīmisko elementu sastāvu, sakausējumu struktūru un veicot rentgenfāžu analīzi. Struktūru izmaiņas sakausējumu rekristalizācijas procesos ar intermetalīdu, karbīdu un grafīta graudu izdalīšanos atkarībā no to ķīmiskā elementu sastāva pētītas ar optiskās mikroskopijas metodēm.Atslēgas vārdi: intermetalīdi, metālu struktūra, ķīmiskais un fāžu sastāvs.

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Experimental study on creep damage evolution process of Type IV cracking in 9Cr–0.5Mo–1.8W–VNb steel welded joint

Cited by 33 publications

References 19 publications

Ageing Effects on Room-Temperature Tensile Properties and Fracture Behavior of Quenched and Tempered T92/TP316H Dissimilar Welded Joints with Ni-Based Weld Metal

Ageing Effects on Room-Temperature Tensile Properties and Fracture Behavior of Quenched and Tempered T92/TP316H Dissimilar Welded Joints with Ni-Based Weld Metal

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

Intermetalītisko – ķīmisko savienojumu veidošanās un to izraisītās metālu sakausējumu struktūru izmaiņas atkarībā no to ķīmisko elementu sastāva

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