Coarsening of precipitates and degradation of creep resistance in tempered martensite steels

Chilukuru, Hemambar; Durst, Karsten; Wadekar, S.L.; Schwienheer, Michael; Scholz, Alfred; Berger, Christina; Mayer, Karl; Blum, W.

doi:10.1016/j.msea.2008.04.088

Cited by 51 publications

(26 citation statements)

References 7 publications

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“…The amount, size, distribution and morphology of these particles have marked influence on the materials' properties [9]. The presence of fine precipitates with small spacing between them tends to pin grain boundaries and to inhibit static and dynamic recrystallization, while the coarsening of these particles may deteriorate some properties such as fatigue and corrosion resistance [17,18]. In order to optimize strength and corrosion resistances, an appropriate microstructure must be attained, which in turns depends on the chemical composition and on the previous thermomechanical processing history.…”

Section: Introductionmentioning

confidence: 99%

Interaction between recrystallization and strain-induced precipitation in a high Nb- and N-bearing austenitic stainless steel: Influence of the interpass time

Silva

Gallego

Cabrera

et al. 2015

Materials Science and Engineering: A

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In this work, we studied the influence of the interpass time (20 and 5 s) on the interaction between recrystallization and strain-induced precipitation occurring during multiple passes' deformations under continuous cooling conditions in a high niobium-and nitrogen-bearing austenitic stainless steel (ISO 5832-9). The correlation between microstructure evolution and hot mechanical properties was performed by physical simulation using hot torsion tests. The microstructure evolution was analyzed by optical microscopy, transmission electron microscopy and electron back scattered diffraction (EBSD). This technique indicated that dynamic recrystallization occurred at the first passes promoting an excellent grain refinement. On the other hand, shorter interpass time (5 s) allowed higher volume fraction of smallest precipitates than larger interpass time (20 s). After soaking, only TiNbN precipitates were found, whereas, Z-phase (CrNbN) and NbN were formed during thermomechanical processing. Particles with sizes between 20 and 50 nm were effective to pin grain boundaries and dislocations.2

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Section: Introductionmentioning

confidence: 99%

Interaction between recrystallization and strain-induced precipitation in a high Nb- and N-bearing austenitic stainless steel: Influence of the interpass time

Silva

Gallego

Cabrera

et al. 2015

Materials Science and Engineering: A

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“…Transmission electron microscopic (TEM) analyses have enabled researchers to attribute lath/subgrain coarsening in the martensitic/ferritic microstructure as the primary reason for cyclic softening in this class of steels (Chilukuru et al, 2009;Dubey et al, 2005;Fournier et al, 2006). The degree of microstructural coarsening has been shown to correlate with the applied inelastic strain per cycle (Fournier et al, 2009a) and is enabled by annihilation of dislocations introduced during martensitic transformation (Armas et al, 2004), coarsening of precipitates (Jones, 1983;Kim and Weertman, 1988) and changes in effective applied stress due to surface oxide film formation (Ebi and McEvily, 1984).…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Dislocation-based constitutive modeling of martensitic/ferritic steels at elevated temperatures. Part II: Cyclic behavior without hold time effects

Kalyanasundaram

Saxena

Holdsworth

2013

International Journal of Plasticity

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“…This observation is consistent with previous reports. [16][17][18] The driving force for precipitate growth stems from the interfacial energy, and the growth rate is controlled by the volume diffusion. Krishtal 19) already showed that the Co and Al increase the diffusion rate of carbon in steels, but the retardation of coarsening of carbide is mainly attributed to the suppression of iron (or substitutional atoms).…”

Section: Discussionmentioning

confidence: 99%

Effect of Tempering Temperature on the Microstructure and Hardness of a Super-bainitic Steel Containing Co and Al

Hou

et al. 2014

ISIJ Int.

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The effect of tempering temperature, within the range of 400 to 700°C, on the microstructure and hardness of two super-bainitic steels, one as the control parent sample and the other with added Co & Al was investigated. Post-tempering examinations of the super-bainitic samples showed that low temperature tempering cycles (400-500°C) resulted in carbides formation, and some increases in the hardness possibly due to precipitation strengthening in the Co & Al contained steel. Once the tempering temperature increased to 600°C, the hardness plummeted in both steels due to the concurrent coarsening of the bainitic ferrite plates and more precipitation of carbides. At the higher tempering temperature of 700°C, further reduction in the hardness occurred because of the accelerated recovery of ferrite and spheroidization of carbides. This work clearly showed that the super-bainitic steel containing Co & Al had a superior tempering resistance particularly at low tempering temperatures (<500°C) due to reduced carbide precipitation in the presence of Co & Al.

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Coarsening of precipitates and degradation of creep resistance in tempered martensite steels

Cited by 51 publications

References 7 publications

Interaction between recrystallization and strain-induced precipitation in a high Nb- and N-bearing austenitic stainless steel: Influence of the interpass time

Interaction between recrystallization and strain-induced precipitation in a high Nb- and N-bearing austenitic stainless steel: Influence of the interpass time

WITHDRAWN: Dislocation-based constitutive modeling of martensitic/ferritic steels at elevated temperatures. Part II: Cyclic behavior without hold time effects

Effect of Tempering Temperature on the Microstructure and Hardness of a Super-bainitic Steel Containing Co and Al

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