Textural and microstructural developments during fabrication of Zr–2.5Nb pressure tubes

Kumar, Manoj; Vanitha, C.; Samajdar, I.; Dey, G.K.; Tewari, R.; Srivastava, D.; Banerjee, S.

doi:10.1016/j.jnucmat.2004.07.003

Cited by 26 publications

(30 citation statements)

References 16 publications

(24 reference statements)

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“…Contrary to [15][16][17], where in the explanation of texture development during cold rolling the ␣-grains are treated as rigid bodies during deformation and the accommodation of plastic strain is mainly by the ␤-phase, the phase strains shown in Fig. 4 give direct evidence that in this material the ␣-phase yields at a lower applied stress during room temperature deformation than does the ␤-phase.…”

Section: Discussionmentioning

confidence: 88%

“…Thus, despite the fact that the {0002} grain family in the ␣-phase is the strongest among all the grain families in this dual phase system, the average ␤-phase is actually stronger than the ␣-phase. This brings the explanation proposed in [15][16][17] regarding the effect of the ␤-phase on the texture development in Zr-2.5Nb into question. The high strength of the ␤-phase could be due to its very fine grain size, and/or to preferential segregation of alloying elements.…”

Section: Discussionmentioning

confidence: 99%

“…The deformation strain is ∼60% in the first stage cold working and ∼25% in the second stage cold working [15]. Still, no significant texture development in the ␣-phase occurs during cold working and no recrystallization is observed after the intermediate and final annealing [16]. Kumar et al [17] proposed that at room temperature the ␤-phase is relatively softer than the ␣-phase and thus the plastic flow is mainly confined to the ␤-matrix, restricting the texture change in the ␣-phase.…”

Section: Introductionmentioning

confidence: 92%

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Evolution of interphase and intergranular stresses in Zr–2.5Nb during room temperature deformation

Cai

Daymond

Holt

et al. 2009

Materials Science and Engineering: A

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Both in situ tension and compression tests have been carried out on textured Zr-2.5Nb plate material at room temperature. Deformation along all the three principle plate directions has been studied and the evolution of interphase and intergranular strains along the loading and the principle Poisson's directions has been investigated by neutron diffraction. The evolution of interphase and intergranular strain was determined by the relative phase properties, crystal properties and texture distribution. The average phase behaviors are similar during tension and compression, where the ␤-phase in this material is stronger than the ␣-phase. The asymmetric yielding of the ␣-{0002} grain family results in a relatively large intergranular strain in the loading direction during compression and different dependence of strength during tension and compression on texture. The combination of the thermal residual stress and the asymmetric CRSS in the c axis gives the {0002} grain family a higher strength in compression than in tension.

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Section: Discussionmentioning

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 92%

See 1 more Smart Citation

Evolution of interphase and intergranular stresses in Zr–2.5Nb during room temperature deformation

Cai

Daymond

Holt

et al. 2009

Materials Science and Engineering: A

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show abstract

“…The smaller grains are about 0.1 to 0.2 μm in size and are believed to form by the transformation of the beta phase during cooling [15]. The beta phase, as indicated by EDS results, contains 8-12% Nb and makes up 20-28% of the room temperature microstructure of the extruded tube [14].…”

Section: Extrusionmentioning

confidence: 98%

“…In general, pressure tubes having grains that are thinner in the radial direction show higher diametral creep and vice versa [9]. because the microstructure and texture established during extrusion does not undergo any appreciable change in the subsequent process steps [14,15]. Thus extrusion effectively decides the final metallurgical condition of the pressure tubes and hence their performance in the reactor.…”

Section: Effect Of Alloying Elementsmentioning

confidence: 99%

Effect of process variables on texture and creep of pressurised heavy water reactor pressure tubes

Deshmukh¹,

Singha²,

Tonpe³

et al. 2010

Trans Indian Inst Met

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Zr-2.5 wt%Nb pressure tubes are used for coolant channels of Pressurised Heavy Water Reactors (PHWRs). These pressure tubes are lifetime components of the reactor and have to sustain extremely harsh conditions of temperature, pressure and neutron irradiation during service. One of the major life limiting factors for pressure tubes is diametral creep. This causes dilation of the pressure tube leading to flow bypass and inefficient heat removal from fuel bundles. This underscores the importance of producing pressure tubes with higher creep resistance. The primary metallurgical parameters controlling the creep strength of Zr-2.5Nb pressure tubes are texture, microstructure, grain size, dislocation density and alloying additions. This includes the strengthening of beta phase due to niobium enrichment. Heat treated Zr-2.5Nb pressure tubes have been reported to have the highest creep strength. This paper briefly discusses the effects of various processing parameters on the microstructure and texture of pressure tubes, which enhance their creep resistance.

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Coarsening of second phase in a two-phase Zr–2.5Nb: On the role of phase boundaries

et al. 2009

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Textural and microstructural developments during fabrication of Zr–2.5Nb pressure tubes

Cited by 26 publications

References 16 publications

Evolution of interphase and intergranular stresses in Zr–2.5Nb during room temperature deformation

Evolution of interphase and intergranular stresses in Zr–2.5Nb during room temperature deformation

Effect of process variables on texture and creep of pressurised heavy water reactor pressure tubes

Coarsening of second phase in a two-phase Zr–2.5Nb: On the role of phase boundaries

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