Effects of pretest aging on creep crack growth properties of type 308 austenitic stainless steel weld metals

Konosu, Shinji; Mashiba, H.; Takeshima, Masayuki; Ohtsuka, Takashi

doi:10.1016/s1350-6307(99)00047-3

Cited by 9 publications

(7 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Welding. Konosu et al [34] observed hot cracking in three stainless steel weld metals and the hot cracking extends along the γ/σ interface boundaries. The γ/σ interface boundaries are an initial fracture position of low elongation.…”

Section: Extension Of Hot Cracking Duringmentioning

confidence: 99%

Overview of Intermetallic Sigma () Phase Precipitation in Stainless Steels

2012

View full text Add to dashboard Cite

The phase which exists in various series of stainless steels is a significant subject in steels science and engineering. The precipitation of the phase is also a widely discussed aspect of the science and technology of stainless steels. The microstructural variation, precipitation mechanism, prediction method, and effects of properties of phase are also of importance in academic discussions. In the first section, a brief introduction to the development and the precipitation characteristics (including morphologies and precipitation sites) of phase in stainless steels is presented. In the second section, the properties effect, prediction method, processing effect, elemental addition, retardation method and Thermo-Calc simulation of the phase in stainless steels are highlighted.

show abstract

Section: Extension Of Hot Cracking Duringmentioning

confidence: 99%

Overview of Intermetallic Sigma () Phase Precipitation in Stainless Steels

2012

View full text Add to dashboard Cite

show abstract

“…The weld deposit typically contains 0.02 wt.% bismuth (200 ppm), and there have been reports of intergranular cracking and premature creep failure in such weldments after a period of service at 650-750°C [2][3][4]. Different fractographic studies have shown the presence of bismuth or bismuth oxide on the surface of fractured creep specimens [5,6]. The vast majority of stainless steel weld deposits are put into service below about 250°C (480°F), but within power generation and process industries, extended service can exceed temperatures of 480°C (900°F) [7].…”

Section: Introductionmentioning

confidence: 99%

“…Weld metals deposited from bismuth-free FCAW wires have been shown to have high-temperature creep properties on par with those made with other welding processes and consumables [8]. Konosu et al [6] carried out creep tests at 650°C on type E308 FCAW weld metal with 230 ppm bismuth and compared these with bismuth-free FCAW and SMAW deposits. It was concluded that FCAW wire alloyed with bismuth caused segregation of bismuth in the grain boundaries and that this was harmful with respect to creep ductility and creep crack growth properties.…”

Section: Introductionmentioning

confidence: 99%

Austenitic stainless steel bismuth-free flux-cored wires for high-temperature applications

et al. 2016

View full text Add to dashboard Cite

Since the 1970s, bismuth is widely used as an auxiliary ingredient in stainless steel flux-cored wires to improve slag detachability. But, for components subject to post-weld heat treatment (PWHT) and/or applications at high temperature, bismuth has been confirmed to have a negative effect on weld metal ductility. It has been suggested that this is due to grain boundary bismuth segregation, and it has been debated whether it is as bismuth or as bismuth oxide Bi 2 O 3 . There are also reports on cracks found in weldments after service at elevated temperatures. This has affected the specifications, and API RP 582 has included a maximum bismuth content of 20 ppm in the weld deposit when welding with austenitic stainless steel flux-cored wires for applications above 538°C, including PWHT. This demand required development of a range of flux-cored wires intended for overlay welding (cladding) of creepresistant steels and joining stainless steels for hightemperature applications. Standard E347, E309L and E308H wires have here been compared with bismuthfree versions in as-welded condition and after PWHT. All-weld metal has been subject to mechanical, hot ductility and Varestraint testing. Results show that bismuthfree wires have higher ductility, and this was confirmed also when welding in single V-butt weld joints. Electron microprobe analysis (EPMA) modified for high precision mapping is used to illustrate that bismuth has a particle-like distribution without any clear relation to oxygen.

show abstract

“…The weld deposit typically contains 0.02 wt% bismuth (200 ppm), and there have been reports of intergranular cracking and premature creep failure in such weldments after a period of service at 650-750 °C [2][3][4]. Different fractographic studies have shown presence of bismuth or bismuth oxide on the surface of fractured creep specimens [5,6]. The vast majority of stainless steel weld deposits are put into service below about 250 °C (480 °F), but within power generation and process industries, extended service can exceed temperatures of 480 °C (900 °F) [7].…”

Section: Introductionmentioning

confidence: 99%

“…Weld metals deposited from bismuth-free FCAW wires have been shown to have high-temperature creep properties on par with those made with other welding processes and consumables [8]. Konosu et al [6] carried out creep tests at 650 °C on Type 308 FCAW weld metal with 230 ppm bismuth and compared these with bismuth-free FCAW and SMAW deposits. It was concluded that FCAW wire alloyed with bismuth caused segregation of bismuth in the grain boundaries and that this was harmful with respect to creep ductility and creep crack growth properties.…”

Section: Introductionmentioning

confidence: 99%

Stainless Steel Bismuth Free Flux-cored Wires for High Temperature Applications

Westin

Schnitzer

Ciccomascolo

et al. 2015

Berg Huettenmaenn Monatsh

View full text Add to dashboard Cite

Zusammenfassung: Bismut wird seit den 1970iger Jahren weit verbreitet als Zusatzstoff in Fülldrähten eingesetzt um den Schlackenabgang zu verbessern. Für Bauteile, die jedoch einer Wärmebehandlung nach dem Schweißen unterzogen werden oder auch bei höheren Temperaturen eingesetzt werden, wurde ein negativer Einfluss von Bismut auf die Zähigkeit des Schweißgutes gefunden. Es wurden auch Risse in Schweißnähten entdeckt, die höhe-ren Einsatztemperaturen ausgesetzt waren. Daher wird in manchen Spezifikationen bereits eine Beschränkung des Bismut-Gehaltes in Schweißgütern vorgeschrieben. Zum Beispiel wird in der API RP 582 ein maximal zulässiger Bismut-Gehalt von 20 ppm im Schweißgut genannt, wenn mit Fülldrähten geschweißt wird und die Anwendungsoder Wärmebehandlungstemperatur über 538 °C liegt. Diese Anforderung erforderte eine Neuentwicklung von Fülldrähten, die für Plattierungen von kriechbeständigen Stählen und zum Verbindungsschweißen von korrosionsbeständigen, austenitischen Stählen für höhere Temperaturen eingesetzt werden. Die neu entwickelten Schweiß-zusatzwerkstoffe umfassen die Legierungen E347, E309 L und E308H. Zwei Typen pro Legierung sind verfügbar: eine optimierte Variante für das Schweißen in Wannenlage (waagrechtes Schweißen) und eine optimierte Variante mit schnell erstarrender Schlacke für das Positionsschweißen. Die mechanisch-technologischen Eigenschaften im reinen Schweißgut, im V-Verbindungsschweißgut und Plattierungsanwendungen der neu entwickelten Fülldräh-te werden mit jenen der Standard-Schweißgüter verglichen. Der Einfluss der chemischen Zusammensetzung auf das Schweißverhalten und den Schlackenabgang wird diskutiert und einige Anwendungsbeispiele für den Einsatz dieser speziellen Fülldrähte in der Öl-und Gasindustrie aufgezeigt.Abstract: Since the 1970s, bismuth has been widely used as an auxiliary ingredient in stainless steel flux-cored wires to improve slag detachability. But for components subject to post weld heat treatment (PWHT) and/or applications at high temperature, bismuth has been confirmed to have a negative effect on weld metal ductility. There are also reports on cracks found in such weldments after service at elevated temperatures. For this reason, specifications recently started limiting the weld metal bismuth content. API RP 582, for instance, has included a maximum bismuth content of 20 ppm in the weld deposit when welding with austenitic stainless steel flux-cored wires for applications above 538 °C, including PWHT. This new demand required development of a new range of flux-cored wires intended for overlay welding (cladding) of creep resistant steels and joining stainless steels for high temperature applications. The fillers that have been developed include the alloys E347, E309 L, and E308H. Two types for each alloy are available: One is optimized for welding in flat/horizontal position, and the other features a fast-freezing slag system supporting the weld pool when welding in other positions. The mechanical properties obtained in all-weld metal, V joints, and weld ...

show abstract

Effects of pretest aging on creep crack growth properties of type 308 austenitic stainless steel weld metals

Cited by 9 publications

References 8 publications

Overview of Intermetallic Sigma () Phase Precipitation in Stainless Steels

Overview of Intermetallic Sigma () Phase Precipitation in Stainless Steels

Austenitic stainless steel bismuth-free flux-cored wires for high-temperature applications

Stainless Steel Bismuth Free Flux-cored Wires for High Temperature Applications

Contact Info

Product

Resources

About