Effect of tooling design on the cold pilgering behavior of zircaloy tube

Zhang, H.Q; Wang, X.F; Wei, Baolin; Li, Hengyun

doi:10.1007/s00170-017-0250-0

Cited by 11 publications

(4 citation statements)

References 14 publications

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“…This diagram is called the strain diagram, and any change in tube size can be represented by a vector on the strain diagram, called the strain vector. The magnitude and angle of strain vector are directly corresponding to the rolling deformation degree and deformation mode, and the projection length along the three axes represents the deformation assign weights along the radial, circumferential and axial directions [10,27]. The strain diagram of this experiment is shown in Figure 6.…”

Section: Discussionmentioning

confidence: 99%

“…The effect of rolled 'Q' ratio on the texture of Ti-3Al-2.5V tube has not been fully revealed. Now, it is generally believed that the texture of titanium and zirconium alloy tube is mainly controlled by the strain during rolling process [10,27]. Different 'Q' ratio would lead to different strain along the radial, circumferential and axial direction, thus affecting the basal pole orientation of the hexagonal crystal.…”

Section: Introductionmentioning

confidence: 99%

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Effect of ‘Q’ Ratio on Texture Evolution of Ti-3Al-2.5V Alloy Tube during Rolling

Hui

et al. 2022

Materials

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Ti-3Al-2.5V alloy was usually the α phase of HCP structure at room temperature which had obvious anisotropy. During tube rolling, α grain would be influenced by stress-strain state, deformation amount, ‘Q’ ratio to result the preferred orientation and formed texture. In order to obtain radial texture tube by rolling and improve the service quality of tube in the pipeline system, Φ25 mm Ti-3Al-2.5V alloy tubes was selected as billet for the experiment, and four kinds of tubes with outer diameter of Φ16mm was produced by single pass cold rolling with ‘Q’ ratios ranging from 0.65 to 2.0. The effect of ‘Q’ ratio on the texture of Ti-3Al-2.5V tube was studied. The result indicted that the initial texture of the tube is radial-circumferential equally distributed, and the radial basal texture enhances gradually with increasing ‘Q’ ratio. Since the angle between the C-axis of grain and the radial axis of RD decreases, the C-axis of grain distributes to the radial direction, and the more grain orientation from {112(—)X} pyramidal to {0001} basal plane. The different ‘Q’ ratio would lead to different strain along the radial direction, circumferential direction, axial direction, thus affected the crystal orientation and distribution during tube rolling deformation. When ‘Q’ > 1, the tube mainly produced radial basal texture. By comparison with ‘Q’ < 1, the tube mainly produced circumferential basal texture. As a result, when the initial texture of the tube is radial-circumferential equally distributed, the ideal radial texture of the tube can be obtained by choosing rolling process with ‘Q’ > 2.0.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of ‘Q’ Ratio on Texture Evolution of Ti-3Al-2.5V Alloy Tube during Rolling

Hui

et al. 2022

Materials

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“…The compressive properties of the tube, which were related to the heat treatment conditions, affected inner fissure formation during cold pilgering. Zhang et al [15] simulated the pilgering process of zirconium alloy tubes rolled with different roller grooves using finite element simulations, and analyzed the influence of groove parameters on the rolling force and surface cracks of the finished tubes during the cold pilgering forming process. Montmitonnet P et al [16] studied the pilgering process of Zircaloy-4 alloy tubes and proposed that the normal stress at the bottom of the rolling groove affected the surface morphology of the tube.…”

Section: Introductionmentioning

confidence: 99%

Inner Surface Morphology and Roughness Evolution of Pilgering Thick-Walled Tubes

Li,

Jin,

Wang

et al. 2023

Materials

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A hot-working die steel thick-walled tube Pilger rolling test was carried out using an LG40 Pilger mill, and the morphology and roughness evolution of the inner surface were examined using a white-light interferometer. The experimental results showed that micro-wrinkles formed on the basis of the original inner surface morphology, the altitude difference (Sz) between the peaks and valleys of the inner surface profile increased from 3.18 to 3.686 μm, and Sa increased from 0.722 to 0.892 μm in the diameter reduction zone. As the tube continued to feed into the wall thickness reduction zone, the micro-wrinkles gradually flattened, Sz and Sa were decreased to 1.625 and 0.174 respectively, and Sa maintained a slight fluctuation of 0.174~0.2 μm in the final sizing zone. From the diameters of the roller groove and taper of the mandrel, the three-dimensional strain of the tube in the wall thickness reduction zone was calculated, and the strain state of the tube in the complete deformation zone could be analyzed by finite element simulations. We found that in the diameter reduction zone, the inner surface was not supported by the mandrel and was free, while micro-wrinkles formed under circumferential compressive strain. In the wall thickness reduction zone, the deformation of the inner surface was controlled by the mandrel, and the micro-wrinkles were gradually flattened by radial compressive strain. The ratio of radial to circumferential strain was the key to flattening the micro-wrinkles, and when the ratio increased, the inner surface roughness (Sa) was reduced to 0.174 μm. In the sizing zone, the radial and circumferential strains were small, and the inner surface roughness showed no obvious fluctuation.

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“…Pilgering is an important method for producing high-performance tubes. It has the characteristics of high material utilization, large accumulated deformation in cross section, and high machining accuracy and is widely used in processing and manufacturing of various metal tubes including stainless steel, titanium alloys, and zirconium alloys [2,3]. In view of this, domestic and foreign research scholars are studying cold pilgering, including the design of holes and equipment and the optimization of process parameters.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution of Cold Pilgering Stainless Steel Tubes

Dai

Chu

2020

Advances in Materials Science and Engineering

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e 347 stainless steel tube cold rolling test was carried out by a LG60 two-roll pilger mill. e microstructure evolution was examined by microscope, SEM, and XRD tests. e finite element software DEFORM-3D has been used to simulate the pilgering process, and the obtained equivalent stress and metal flow were analyzed. e experimental results showed that the internal slip line was randomly distributed, the deformation of the inner wall was more intense than the outer wall structure, and the austenite c phase was transformed into the α′-martensitic phase. e simulation results indicated that the direction of metal flow was constantly changing, and the equivalent stress of the inner wall of the steel tube was greater than the equivalent stress of the outer wall. In addition, the slip zone of the inner wall of the characteristic section was more severe than that near the outer wall slip zone. e simulation verified the experimental results to some extent.

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Effect of tooling design on the cold pilgering behavior of zircaloy tube

Cited by 11 publications

References 14 publications

Effect of ‘Q’ Ratio on Texture Evolution of Ti-3Al-2.5V Alloy Tube during Rolling

Effect of ‘Q’ Ratio on Texture Evolution of Ti-3Al-2.5V Alloy Tube during Rolling

Inner Surface Morphology and Roughness Evolution of Pilgering Thick-Walled Tubes

Microstructure Evolution of Cold Pilgering Stainless Steel Tubes

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