Weldability assessment and high temperature properties of advanced creep resisting austenitic steel DMV304HCu

Vekeman, Jelle; Huysmans, S.; Bruycker, Evy De

doi:10.1007/s40194-014-0166-3

Cited by 13 publications

(17 citation statements)

References 4 publications

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“…[13][14][15] . Among these materials Super 304H is widely used in super heater headers where the working temperature is between 450-550°C 2,14,16 .…”

Section: Weld Joint Characteristicsmentioning

confidence: 99%

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A Study on Process Characteristics and Performance of Hot Wire Gas Tungsten Arc Welding Process for High Temperature Materials

Mr¹,

Kandasamy

2016

Mat. Res.

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Hot wire gas tungsten arc welding (HW-GTAW) process is the one where the filler wire is preheated close to its melting point before it is fed in to the arc. The effect of HW-GTAW parameters such as welding current, hot wire current and the wire feed rate during welding of super ASS 304H stainless steel tubes were evaluated in terms of heat input, voltage-current (V-I) characteristics and weld bead characteristics such as bead weight and geometry. The results obtained indicate that for a constant welding current, increasing the hot wire current and wire feed rate provides a stable V-I characteristics and higher bead weight. Further, increasing the hot wire current and wire feed rate also provides better or desired weld pool and hence the bead geometry was described in terms of width, penetration depth, area of fusion and toe angle. By utilising the above knowledge, the tube to tube butt welding of SS 304H material was carried out. It was observed that, the weld joint is qualified as per the quality requirement of ASME: Sec IX standard.

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“…[13][14][15] . Among these materials Super 304H is widely used in super heater headers where the working temperature is between 450-550°C 2,14,16 .…”

Section: Weld Joint Characteristicsmentioning

confidence: 99%

“…The tendency of hot cracking enhances with an increasing brittle temperature range (BTR) between nil strength temperature and ductility recovery temperature 14 . The BTR largely depends on the heat input of the process.…”

Section: Weld Joint Characteristicsmentioning

confidence: 99%

A Study on Process Characteristics and Performance of Hot Wire Gas Tungsten Arc Welding Process for High Temperature Materials

Mr¹,

Kandasamy

2016

Mat. Res.

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“…Works carried out on weldability studies and high temperature properties of Super 304H weld joints reported the tendency of Super 304H to hot cracking and use of matching Super 304H filler metal as an alternate to Ni-based filler metal (Vekeman et al 2014;Kim et al 2014). However, the available information on solidification behaviour of gas tungsten arc (GTA) welds of Super 304H and its effects on high temperature properties are very scant.…”

Section: Introductionmentioning

confidence: 99%

Effect of filler addition on solidification behaviour and hot tensile properties of GTA-welded tube joints of Super 304H austenitic stainless steel

Kumar

Balasubramanian

Rao

2015

Int J Mech Mater Eng

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Background: Super 304H austenitic stainless steel tubes containing 2.3 to 3 (wt.%) of Cu are mainly used in superheaters and reheaters of ultra super critical boilers due their excellent corrosion and oxidation resistance. Cu addition causes precipitation strengthening effect by fine Cu-rich precipitates which evolve during creep conditions and results in increased creep strength. The microstructural evolution of stainless steels during welding significantly affects the material properties. Methods: In this work, solidification mode microstructure and hot tensile properties of autogenous and filler-added Super 304H gas tungsten arc (GTA) welded tube joints were correlated. Results: Autogenous welds of Super 304H solidified as austenite with 1.57 % delta ferrite and intercellular (Fe,Cr) 23 (C,B) 6 borocarbides. In filler-added welds, the higher Ni equivalent and addition of carbide stabilizing elements (Nb,Mo) eliminated δ ferrite and segregation of B as borocarbides. Conclusions: The filler-added welds exhibited superior tensile strength than autogenous welds at both room and high temperature.

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“…On top of this, secondary hardening mechanisms (gamma prime) in A617 can even aggravate the situation. Aging results at 3000h/625 °C conducted in the collaborative research projects [16] revealed an extreme hardening for direct welds using A617 filler metals. It points out that strains during creep/high temperature exposure are concentrated in the fusion line areas.…”

Section: Discussionmentioning

confidence: 99%

“…Osim toga, mehanizmi sekundarnog očvršćivanja (gama prim) u A617 mogu čak pogoršati situaciju. Rezultati starenja na 3000h/625 °C dobijeni u zajedničkim istraživačkim projektima [16] otkrili su ekstremno očvršćavanje kod direktnog zavarivanja pomoću A617 dodatnih materijala. Ona naglašava da su deformacije tokom puzanja / izlaganja visokim temperaturama koncentrisani u oblasti stsapanja.…”

Section: Diskusijaunclassified

Dissimilar metal welds between martensitic and advanced austenitic high temperature creep resisting steels: Creep rupture test results and fusion line investigation

Huysmans¹,

Vekeman²,

Hautfenne³

2017

Zavarivanje i zavarene konstrukcije

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Ključne reči: materijali otporni na puzanje, raznorodni zavareni spojevi, ispitivanje granice puzanja i karbidi na liniji stapanja Key words: Creep resisting materials, dissimilar welds, creep rupture testing and fusion line carbides. AbstractModern and future power plants will use more elaborated and complex materials to withstand the higher steam temperatures and pressures as well as thermal cycling. As such, dissimilar metal welds (DMWs) will be much more widespread in new design than before and will need to demonstrate resistance to combinations of severe creep, corrosion/oxidation and low cycle fatigue. The DMWs between different steels or alloys are an underestimated topic. Experienced and documented premature failures reveal the criticality of DMWs. This study focused on the DMWs between martensitic and advanced austenitic stainless steels. Two collaborative projects related to a 18%Cr and 25%Cr austenitic creep resisting stainless steel delivered data concerning base metal characterization and weldability of similar and dissimilar welding. The specific features of dissimilar welding are further approached in more detail in this analysis. Two main methodologies i.e. direct welding and buttering techniques using different filler metals were investigated and characterized via uni-axial creep rupture testing and metallographic examination particularly focusing on the fusion line carbide formation and morphology. For the limited exposure times of 10kh in this project, the results show that aligned and linked up Rezime Moderne i buduće elektrane će koristiti detaljnije razrađene i složene materijale kako bi izdržali više temperature i pritiske pare, kao i toplotne cikluse. Kao takvi, zavareni spojevi različiti metala (DMW) će biti mnogo rasprostranjeniji u novom dizajnu nego ranije i potrebno je da dokažu otpornost na kombinacije oštrih uslova puzanja, korozije / oksidacije i niskocikličnog zamora. DMW između različitih čelika ili legura su podcenjena tema. Iskustveni i dokumentovani preuranjeni nedostaci otkrivaju kritičnost DMW-a.Ova studija je fokusirana se na DMW između martenzitnih i naprednih austenitnih nerđajućih čelika. Dva kolaborativna projekta vezana su za dostavljene podatke za 18% Cr i 25% Cr austenitne, otporne na puzanje nerđajuće čelike o karakterizaciji osnovnih metala i zavarivljivosti pri istorodnom i raznorodnom zavarivanju. Posebne karakteristike raznorodnog zavarivanja se dalje detaljnije analiziraju. Dve glavne metodologije, tj. tehnike direktnog zavarivanja i puterovanja, korišćenjem različitih dodatnih materijala su istraživane i okarakterisane putem uniaksijalnog ispitivanja loma pri puzanju i metalografskog ispitivanja, sa naročitim fokusom na formiranje i morfologiju karbida na liniji stapanja. Za ograničeno vreme izlaganja od 10kh u ovom projektu, rezultati pokazuju da se javljaju linijske i

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Weldability assessment and high temperature properties of advanced creep resisting austenitic steel DMV304HCu

Cited by 13 publications

References 4 publications

A Study on Process Characteristics and Performance of Hot Wire Gas Tungsten Arc Welding Process for High Temperature Materials

A Study on Process Characteristics and Performance of Hot Wire Gas Tungsten Arc Welding Process for High Temperature Materials

Effect of filler addition on solidification behaviour and hot tensile properties of GTA-welded tube joints of Super 304H austenitic stainless steel

Dissimilar metal welds between martensitic and advanced austenitic high temperature creep resisting steels: Creep rupture test results and fusion line investigation

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