Effect of thermomechanical processing via rotary swaging on properties and residual stress within tungsten heavy alloy

Kunčická, Lenka; Macháčková, Adéla; Lavery, Nicholas; Kocich, Radim; Cullen, Jonathan C.T.; Hlaváč, Libor M.

doi:10.1016/j.ijrmhm.2019.105120

Cited by 46 publications

(30 citation statements)

References 41 publications

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“…The cold-swaged piece exhibited gradually increasing difference in temperatures in the surface and axial swaged piece regions (up to almost 200 • C). Such behaviour is typical for cold swaging technology; the surface temperature of the swaged piece increases primarily due to the effect of direct contact of the surface with the swaging dies, i.e., friction effect [35]. Nevertheless, this effect is reduced by the heat transfer through the cold swaging dies.…”

Section: Discussionmentioning

confidence: 93%

Affecting Structure Characteristics of Rotary Swaged Tungsten Heavy Alloy Via Variable Deformation Temperature

et al. 2019

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This study focuses on numerical prediction and experimental investigation of deformation behaviour of a tungsten heavy alloy prepared via powder metallurgy and subsequent cold (20 °C) and warm (900 °C) rotary swaging. Special emphasis was placed on the prediction of the effects of the applied induction heating. As shown by the results, the predicted material behaviour was in good correlation with the real experiment. The differences in the plastic flow during cold and warm swaging imparted differences in structural development and the occurrence of residual stress. Both the swaged pieces exhibited the presence of residual stress in the peripheries of W agglomerates. However, the NiCO matrix of the warm-swaged piece also exhibited the presence of residual stress, and it also featured regions with increased W content. Testing of mechanical properties revealed the ultimate tensile strength of the swaged pieces to be approximately twice as high as of the sintered piece (860 MPa compared to 1650 MPa and 1828 MPa after warm and cold swaging, respectively).

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Section: Discussionmentioning

confidence: 93%

Affecting Structure Characteristics of Rotary Swaged Tungsten Heavy Alloy Via Variable Deformation Temperature

et al. 2019

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“…Various studies have been carried out on other alloys such as titanium alloys, tungsten-based alloys and copper alloys. The effect of rotary swaging and annealing on residual stress for WNiCo powder-based pseudo alloy was predicted using numerical and experimental techniques (XRD technique) [33]. It was reported that swaging at room temperature introduced higher compressive stresses which decreased after the post heat treatment process [13,33].…”

Section: Introductionmentioning

confidence: 99%

“…The effect of rotary swaging and annealing on residual stress for WNiCo powder-based pseudo alloy was predicted using numerical and experimental techniques (XRD technique) [33]. It was reported that swaging at room temperature introduced higher compressive stresses which decreased after the post heat treatment process [13,33]. Residual stress analyses through X-ray diffraction and the elastoplastic self-consistent (EPSC) model were made on cold pilgered zirconium alloy [34].…”

Section: Introductionmentioning

confidence: 99%

Finite Element Analysis and Experimental Evaluation of Residual Stress of Zr-4 alloys Processed through Swaging

Singh

Kalita

Narayanan³

et al. 2020

Metals

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Zirconium alloy has been extensively used as a cladding material in nuclear power reactors due to its low neutron absorption cross section, excellent mechanical properties, and corrosion resistance. The influence of the swaging parameter, feed rate (0.7, 1.25, 2 m/min) on residual stress induced in Zr-4 alloy is investigated in the present work. A three-dimensional finite element model was implemented in the Deform 3D software to simulate the rotary swaging (RS) process over a circular rod of Zr-4 alloy. The simulation results based on the 3D framework provide a detailed insight of residual stress, true stress versus true strain and force applied over the rod during the multiple pass swaging process; the results are compared with experimental results. The experimental hole drilling method is used to determine the residual stresses on swaged zirconium alloy at different feed rates (0.7, 1.25, and 2 m/min). A similar trend of residual stress between experimental and numerical results from the surface to the center on the swaged rod samples is observed. The same magnitude of residual stress at the surface of the swaged Zr-4 rod is also observed. It is found to be compressive at the surface and tensile in the center of the samples, as observed in the present work.

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“…Some of these researchers prepared models for the process description, while others focused on specific problems, among which the geometric accuracy, surface integrity and kerf roughness are achieving much attention [ 22 , 23 , 24 ]. Roughness might be important not only for manufacturers but also for material engineers, due to its potential to reduce necessary final polishing in cases when AWJ is used for cold cutting in sample preparation [ 25 ]. Although a lot of research was done in the search for a direct and simple connection between the material parameters and the cutting quality, and some unsubstantiated theories were published, no reliable proofs of such a linkage has been brought forward up to now.…”

Section: Introductionmentioning

confidence: 99%

Influence of Steel Structure on Machinability by Abrasive Water Jet

et al. 2020

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Although the abrasive waterjet (AWJ) has been widely used for steel cutting for decades and there are hundreds of research papers or even books dealing with this technology, relatively little is known about the relation between the steel microstructure and the AWJ cutting efficiency. The steel microstructure can be significantly affected by heat treatment. Three different steel grades, carbon steel C45, micro-alloyed steel 37MnSi5 and low-alloy steel 30CrV9, were subjected to four different types of heat treatment: normalization annealing, soft annealing, quenching and quenching followed by tempering. Then, they were cut by an abrasive water jet, while identical cutting parameters were applied. The relations between the mechanical characteristics of heat-treated steels and the surface roughness parameters Ra, Rz and RSm were studied. A comparison of changes in the surface roughness parameters and Young modulus variation led to the conclusion that the modulus was not significantly responsible for the surface roughness. The changes of RSm did not prove any correlation to either the mechanical characteristics or the visible microstructure dimensions. The homogeneity of the steel microstructure appeared to be the most important factor for the cutting quality; the higher the difference in the hardness of the structural components in the inhomogeneous microstructure was, the higher were the roughness values. A more complex measurement and critical evaluation of the declination angle measurement compared to the surface roughness measurement are planned in future research.

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Effect of thermomechanical processing via rotary swaging on properties and residual stress within tungsten heavy alloy

Cited by 46 publications

References 41 publications

Affecting Structure Characteristics of Rotary Swaged Tungsten Heavy Alloy Via Variable Deformation Temperature

Affecting Structure Characteristics of Rotary Swaged Tungsten Heavy Alloy Via Variable Deformation Temperature

Finite Element Analysis and Experimental Evaluation of Residual Stress of Zr-4 alloys Processed through Swaging

Influence of Steel Structure on Machinability by Abrasive Water Jet

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