Nucleation and growth of creep cavities in a Type 347 steel

Needham, N. G.; Gladman, T.

doi:10.1179/030634580790426300

Cited by 114 publications

(31 citation statements)

References 23 publications

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“…It has been attributed to the following: Boron addition enhances the precipitation of carbides through its effect on the solubility of both carbon and nitrogen; also, its addition somehow reduces the tendency of creep cavitation and hence increases the creep strength. Niobium-stabilized type 347 austenitic stainless steel, being highly prone to intergranular creep cavitations, [25] with an increase in its matrix strength through the enhanced precipitation due to boron addition is expected to be associated with the decrease in ductility. So the increase in strength coupled with an increase in creep ductility (Figures 3 through 5) in the steel indicates that the beneficial effect of boron addition on the creep rupture strength and creep ductility especially at longer creep exposure is not mainly due to the enhanced precipitation of carbonitrides and additional precipitation of boride (Figures 10 and 11).…”

Section: A Creep Strength and Microstructurementioning

confidence: 99%

Improved creep strength and creep ductility of type 347 austenitic stainless steel through the self-healing effect of boron for creep cavitation

Laha

Kyono

Sasaki

et al. 2005

Metall Mater Trans A

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Composition of type 347 austenitic stainless steel was modified with the addition of boron and cerium. An improvement of creep strength coupled with creep ductility of the steel was observed with boron and cerium additions. The observation of enhanced precipitation of carbonitrides in boron-containing steel over that of boron-free steel may in part contribute to the increase in creep strength. Both grain boundary sliding and nucleation and growth of intergranular creep cavities were found to be suppressed in steel-containing boron. This results in an increase in creep strength and creep ductility. Auger electron spectroscopic analysis of the chemistry of creep cavity surfaces (exposed by breaking the creepexposed steel specimen at liquid nitrogen temperature under impact loading) revealed the segregation of elemental boron on the creep cavity surface. Boron segregation, on the creep cavity surface in the absence of sulfur contamination, suppressed the cavity growth and provided the steel with a self-healing effect for creep cavitation. Cerium additions enabled boron to segregate on the cavity surface by effectively removing the traces of free sulfur in the matrix by the formation of ceriumoxysulfide (Ce 2 O 2 S).

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Section: A Creep Strength and Microstructurementioning

confidence: 99%

Improved creep strength and creep ductility of type 347 austenitic stainless steel through the self-healing effect of boron for creep cavitation

Laha

Kyono

Sasaki

et al. 2005

Metall Mater Trans A

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“…[17] According to References 17 and 18, the maximum cavity size provided a reliable guide to study cavity growth, since it could be reasonably assumed that the largest cavity present at any time is that which nucleated at zero time (and not during the test). However, Needham and Gladman [20,21] mention that the growth rate evaluated based on the maximum voids may be affected by errors and suggest the selection of the ith largest void instead. Livesey and Ridley [22] propose a partial averaging over the 100 largest cavities, which might be better if local environment influences cavity growth.…”

Section: Introductionmentioning

confidence: 99%

“…Much information is available in the literature, [15][16][17][18][19][20][21][22][23] which is, however, rarely unambiguous. As pointed out by Cane and Greenwood, [17] the mean cavity size is not a satisfactory parameter for the study of cavity-growth kinetics due to continuous nucleation as well as the limited resolution of the experimental techniques.…”

Section: Introductionmentioning

confidence: 99%

In-Situ Microtomographic Characterization of Single-Cavity Growth During High-Temperature Creep of Leaded Brass

Isaac

Dzięcioł

Sket

et al. 2011

Metall Mater Trans A

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International audienceSynchrotron microtomography was used for in-situ characterization of high-temperature creep damage in leaded brass. Applying image registration to subsequent tomographic reconstructions, the volumetric growth rate of single cavities with equivalent radii between 2 and 4.3 mu m was assessed. We conclude from the volume dependence of the growth rates that both the viscous flow and grain boundary (GB) diffusion mechanisms influence void growth. We show that void growth in leaded brass is retarded by negative stress triaxiality, which develops in the matrix during heating the specimen to the deformation temperature

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“…Modelling and experimental number of cavities per unit grain boundary area as a function of creep strain [44]. Experimental data from Hong and Nam [45] for TP304 steel, Laha et al [46] for three different types of austenitic stainless steels and Needham and Gladman [27] for TP347 steel.…”

Section: Particle Sizementioning

confidence: 99%

“…(19) and experimental data from Refs. [27,46,49]. The creep tests were performed at temperatures in the interval of 650-812°C.…”

Section: Constrained Cavity Growthmentioning

confidence: 99%

Survey of Creep Cavitation in fcc Metals

Sandström¹,

He²

2017

Study of Grain Boundary Character

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Cavitation plays an important role in plants operating at high temperatures since the cavitation controls the creep failure of engineering alloys. In the past it has been difficult to predict the cavitation behaviour with the help of basic models, since critical models have been missing. Recently new models have been formulated for grain boundary sliding, cavity nucleation and cavity growth to fill this gap. These models are reviewed in this chapter. It is shown that the new models can quantitatively predict cavitation for austenitic stainless steels, where detailed experimental information is available.

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Nucleation and growth of creep cavities in a Type 347 steel

Cited by 114 publications

References 23 publications

Improved creep strength and creep ductility of type 347 austenitic stainless steel through the self-healing effect of boron for creep cavitation

Improved creep strength and creep ductility of type 347 austenitic stainless steel through the self-healing effect of boron for creep cavitation

In-Situ Microtomographic Characterization of Single-Cavity Growth During High-Temperature Creep of Leaded Brass

Survey of Creep Cavitation in fcc Metals

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