Metastable Phase Transformation in Ti-5Ta-2Nb Alloy and 304L Austenitic Stainless Steel under Explosive Cladding Conditions

Explosive cladding, a solid-state welding technique was used to fabricate dissimilar joints between Ti-5Ta-2Nb alloy and 304L austenitic stainless steel. To remove the residual stresses and improve the ductility of the 'as clad' joints, further heat treatments were carried out in the temperature range of 873 K to 1073 K (600°C to 800°C) for varying durations. Systematic change in the interface microstructure and microchemistry due to thermally activated interdiffusion of alloying elements was studied. This information together with that of the thermal stability of non-equilibrium phases in base materials was used to evaluate the probability of formation of various phases across the explosive clad interface using JMatPro Ò , a materials modeling software. In the clad heat treated at 1073 K (800°C) for 20 hours, evidence was obtained for the presence of different phases (predicted to form) in the diffusion zone by transmission electron microscopy on site-specific specimens prepared by focused ion beam milling. An attempt to understand the specific influence of the type of phase, their relative mole fraction, and microchemistry on the mechanical property of the joint has also been made based on both experimental and computational study.

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“…Detailed investigations on the 'as received' clads [32][33][34][35] led to the following significant observations:…”

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confidence: 99%

Prediction and Confirmation of Phases Formed in the Diffusion Zone of Ti-5Ta-2Nb/304L SS Explosive Clads

Prasanthi

Sudha

Parida

et al. 2015

Metall Mater Trans A

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“…The authors have reported uniform deformation across the 6 mm thick base and flier plates and the formation of metastable phases in our earlier study on explosive clads of SS/TiTaNb [3]. In the present study, signatures of deformation were evident only across a width of ~3 mm on either side of the clad interface due to large thickness of 20 and 12 mm of base and flier plate respectively, which provides the rationale for extracting the cross section specimen of 2 mm thick from either side of interface.…”

Section: Accepted Manuscriptmentioning

confidence: 73%

“…In an earlier study the authors have reported the formation of strain induced  and  phases on SS and metastable fcc phase on TiTaNb sides due to high pressure (>10 GPa) and large strain rate (10 5 s -1 ) during the cladding process [3]. Further, a study on diffusion annealed joints showed enhanced growth kinetics of these reaction zones as compared to diffusion and friction bonded joints [16].…”

Section: Accepted Manuscriptmentioning

confidence: 96%

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Explosive cladding and post-weld heat treatment of mild steel and titanium

2016

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“…Bimetallic sheets in which TA1 is used as the material of the flyer plate instead of steel can greatly improve the life of the refining equipment and pipeline. In recent years, researchers have conducted many studies on the microstructure and mechanical properties [26][27][28][29][30][31][32][33][34][35], heat treatment [36][37][38], hot rolling process [39], residual stress [40], bonding mechanism [41][42][43] and butt welding process [44,45] of explosive bonded Ti/Steel bimetallic sheets. These work mainly focused on the bimetallic sheet itself, while investigation regarding the suitability of explosive bonded Ti/Steel bimetallic sheet for the subsequent process, such as the JCOE process (progressive forming process of 'J' forming, 'C' forming and 'O' forming, reducing gap, welding and mechanical expanding), was rather limited.…”

Section: Introductionmentioning

confidence: 99%

Interface Characteristic of Explosive-Welded and Hot-Rolled TA1/X65 Bimetallic Plate

Xie

Shang

Zhang

et al. 2018

Metals

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TA1/X65 bimetallic plate has a bright future of application by combining the excellent corrosion resistance of TA1 and the high strength of inexpensive X65 steel, while manufacturing large size TA1/X65 bimetallic plate is still a challenging task. Multi-pass hot-rolling is the most common way to achieve a large size bimetallic plate. In this work, interface characteristic of explosive-welded and multi-pass hot-rolled TA1/X65 bimetallic plate is experimentally studied. The microstructure, composition and microhardness distribution across the TA1/X65 interface are investigated by optical metallographic observation, scanning electron microscope (SEM) observation, energy dispersive spectrometer (EDS) analysis, and Vickers hardness test. Shear tests and stratified tensile tests are conducted with emphasis on impacts of the angle between loading direction and detonation wave propagation direction on interface strength. A straight TA1/X65 interface with periodic morphology of residual peninsula could be observed on the cross section parallel to detonation wave propagation direction, while in most cases there is no residual peninsula morphology on the straight TA1/X65 interface when the cross section is perpendicular to detonation wave propagation direction. TA1/X65 interface of explosive-welded and multi-pass hot-rolled bimetallic plate presents higher bearing capacity for the load perpendicular to detonation wave propagation direction than that for the load parallel to detonation wave propagation direction. The results of this paper have a certain guiding significance for the fabrication of pipes and containers made of explosive-welded and hot-rolled TA1/X65 bimetallic plate.

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Metastable Phase Transformation in Ti-5Ta-2Nb Alloy and 304L Austenitic Stainless Steel under Explosive Cladding Conditions

Cited by 19 publications

References 43 publications

Prediction and Confirmation of Phases Formed in the Diffusion Zone of Ti-5Ta-2Nb/304L SS Explosive Clads

Prediction and Confirmation of Phases Formed in the Diffusion Zone of Ti-5Ta-2Nb/304L SS Explosive Clads

Explosive cladding and post-weld heat treatment of mild steel and titanium

Interface Characteristic of Explosive-Welded and Hot-Rolled TA1/X65 Bimetallic Plate

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