Creep rupture behavior of 9Cr–1.8W–0.5Mo–VNb (ASME grade 92) ferritic steel weld joint

Sakthivel, T.; Vasudevan, M.; Laha, K.; Parameswaran, P.; Chandravathi, K.S.; Selvi, S. Panneer; Maduraimuthu, V.; Mathew, M.D.

doi:10.1016/j.msea.2013.10.071

Cited by 107 publications

(32 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[16] Regardless of the previous classification for martensitic steel HAZ regions, it is clear that the region most susceptible to long-term creep failure is one that possesses both a less-than-ideal grain and precipitate structure. Based on the results reported here, it is clearly the case that the PT region, either as a result of a single thermal cycle or the PT region imposed on a pre-existing region in the HAZ, results in an inferior microstructure for long-term creep resistance.…”

Section: Microstructural Influence On Creep Propertiesmentioning

confidence: 99%

“…However, it has been shown that microstructural factors, such as the intrinsic grain boundary properties [11] and the spatial distribution characteristics of secondary precipitates, [12,13] can be associated with premature creep failure that has been observed in the HAZ, for example, type IV failures, [14] upon long-term creep exposure. [15,16] In such cases, failure locations have been identified as being associated with both FGHAZ and ICHAZ regions. [18][19][20] Indeed, difficulties remain in identifying the critical regions where type IV failures occur due to a lack of understanding about the key microstructural factors that lead to the formation of creep damage and, therefore, an accurate description of the HAZ microstructure.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Microstructural Characterization of the Heat-Affected Zones in Grade 92 Steel Welds: Double-Pass and Multipass Welds

West

Siefert³

et al. 2018

Metall Mater Trans A

View full text Add to dashboard Cite

The microstructure in the heat-affected zone (HAZ) of multipass welds typical of those used in power plants and made from 9 wt pct chromium martensitic Grade 92 steel is complex. Therefore, there is a need for systematic microstructural investigations to define the different regions of the microstructure across the HAZ of Grade 92 steel welds manufactured using the traditional arc welding processes in order to understand possible failure mechanisms after long-term service. In this study, the microstructure in the HAZ of an as-fabricated two-pass bead-on-plate weld on a parent metal of Grade 92 steel has been systematically investigated and compared to a complex, multipass thick section weldment using an extensive range of electron and ion-microscopy-based techniques. A dilatometer has been used to apply controlled thermal cycles to simulate the microstructures in distinctly different regions in a multipass HAZ using sequential thermal cycles. A wide range of microstructural properties in the simulated materials were characterized and compared with the experimental observations from the weld HAZ. It has been found that the microstructure in the HAZ can be categorized by a combination of sequential thermal cycles experienced by the different zones within the complex weld metal, using the terminology developed for these regions based on a simpler, single-pass bead-on-plate weld, categorized as complete transformation, partial transformation, and overtempered.

show abstract

Section: Microstructural Influence On Creep Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Microstructural Characterization of the Heat-Affected Zones in Grade 92 Steel Welds: Double-Pass and Multipass Welds

West

Siefert³

et al. 2018

Metall Mater Trans A

View full text Add to dashboard Cite

show abstract

“…It was reported that HAZ failures in 9 to 12 wt pct Cr steel welds can be present either in the fine-grain or intercritical region, [7] accompanied by a significantly shortened lifetime of weldments compared to bulk material samples. [10] A variety of microstructural factors, such as an inhomogeneous distribution of secondary precipitate particles, [8] the presence of an exceptionally fine-grain structure, [11] and excessively grown precipitate particles [12] were considered as the possible causes for Type IV failure. However, there is not yet consensus on whether a specific microstructural factor or a set of factors are dominant in causing HAZ failures.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Thermal Cycles on the Microstructure of Grade 92 Steel

West

Siefert³

et al. 2017

Metall Mater Trans A

View full text Add to dashboard Cite

The microstructure in the heat-affected zone (HAZ) of welds made from the 9 wt pct chromium martensitic Grade 92 steel is complex and has not yet been completely understood. There is a lack of systematic microstructural investigations to define the different regions of the microstructure across the HAZ of Grade 92 steel welds as a function of the welding process. In this study, the microstructure in the HAZ of an as-fabricated single-pass bead-on-plate weld on a parent metal of Grade 92 steel was systematically investigated by using an extensive range of electron and ion-microscopy-based techniques. A dilatometer was used to apply controlled thermal cycles to simulate the microstructures in the different regions of the HAZ. A wide range of microstructural properties in the simulated materials were then characterized and compared with the experimental observations from the weld HAZ. It was found that the microstructure in the HAZ of a single-pass Grade 92 steel weld can be categorized as a function of a decreasing peak temperature reached as (1) the completely transformed (CT) region, in which the original matrix is completely reaustenitized with complete dissolution of the pre-existing secondary precipitate particles; (2) the partially transformed (PT) region, where the original matrix is partially reaustenitized along with a partial dissolution of the secondary precipitate particles from the original matrix; and (3) the overtempered (OT) region, where the pre-existing precipitate particles coarsen. The PT region is considered to be the susceptible area for damage in the commonly reported HAZ failures in weldments constructed from these types of steels.

show abstract

“…In China, the construction of new USC power plants is progressing very rapidly [23] and some types of new 9-12% Cr MHRS have been developed and put into use, such as 12Cr10Co3W2Mo. It is a new type 10% Cr MHRS developed based on P92 by increasing the content of Cr and adding 3% Co to improve creep resistance [9,10,23].…”

Section: Introductionmentioning

confidence: 99%

“…It is a new type 10% Cr MHRS developed based on P92 by increasing the content of Cr and adding 3% Co to improve creep resistance [9,10,23]. It is intended to be used in the main steam pipe, reheat pipe and steam turbine first stage nozzle of coal-fired USC power plants.…”

Section: Introductionmentioning

confidence: 99%

Microstructure of 10% Cr martensitic heat-resistant steel welded joints and type IV cracking behavior during creep rupture at 650°C

Zhang

Zhao

et al. 2015

Materials Science and Engineering: A

View full text Add to dashboard Cite

Creep rupture behavior of 9Cr–1.8W–0.5Mo–VNb (ASME grade 92) ferritic steel weld joint

Cited by 107 publications

References 26 publications

Microstructural Characterization of the Heat-Affected Zones in Grade 92 Steel Welds: Double-Pass and Multipass Welds

Microstructural Characterization of the Heat-Affected Zones in Grade 92 Steel Welds: Double-Pass and Multipass Welds

The Influence of Thermal Cycles on the Microstructure of Grade 92 Steel

Microstructure of 10% Cr martensitic heat-resistant steel welded joints and type IV cracking behavior during creep rupture at 650°C

Contact Info

Product

Resources

About