Effects of minor Zr addition on the microstructure and mechanical properties of laser welded dissimilar joint of titanium and molybdenum

Zhang, Linjie; Lu, Guang-Feng; Ning, Jie; Zhu, Qi; Zhang, Jianxun; Na, Suck-Joo

doi:10.1016/j.msea.2018.10.037

Cited by 20 publications

(5 citation statements)

References 25 publications

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“…The results demonstrated that tensile strength of the joints could be increased to ~280 MPa by presetting a nickel (Ni) foil at Mo/304 L interface and shifting laser beam to 304L, whereas the tensile strength of the sample without Ni foil is only 112 MPa, and the results of tensile test is shown in Figure 15. In the study of Lu et al (2018) [32,33], by adding zirconium (Zr) to the molten pool, ultimate tensile strength (UTS) of the dissimilar joint of titanium and molybdenum was increased from about 350 MPa to ~470 MPa, which reached more than 90% of that of the Ti base metal (BM). Zhou et al (2018) [34] observed cracks in dissimilar laser welding of tantalum to molybdenum and pointed out that solidification cracking tendency of Mo was the main reason for crack initiation in the Ta/Mo joint.…”

Section: Laser Weldingmentioning

confidence: 99%

Research Status and Progress of Welding Technologies for Molybdenum and Molybdenum Alloys

Zhu¹,

Xie

Shang

et al. 2020

Metals

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Owing to its potential application prospect in novel accident tolerant fuel, molybdenum alloys and their welding technologies have gained great importance in recent years. The challenges of welding molybdenum alloys come from two aspects: one is related to its powder metallurgy manufacturing process, and the other is its inherent characteristics of refractory metal. The welding of powder metallurgy materials has been associated with issues such as porosity, contamination, and inclusions, at levels which tend to degrade the service performances of a welded joint. Refractory metals usually present poor weldability due to embrittlement of the fusion zone as a result of impurities segregation and the grain coarsening in the heat-affected zone. A critical review of the current state of the art of welding Mo alloys components is presented. The advantages and disadvantages of the various methods, i.e., electron-beam welding (EBW), tungsten-arc inert gas (TIG) welding, laser welding (LW), electric resistance welding (ERW), and brazing and friction welding (FW) in joining Mo and Mo alloys, are discussed with a view to imagine future directions. This review suggests that more attention should be paid to high energy density laser welding and the mechanism and technology of welding Mo alloys under hyperbaric environment.

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Section: Laser Weldingmentioning

confidence: 99%

Research Status and Progress of Welding Technologies for Molybdenum and Molybdenum Alloys

Zhu¹,

Xie

Shang

et al. 2020

Metals

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“…It plays a vital role in the nuclear, aerospace [2], automobile [2], and chemical industries [3], as well as other engineering applications [4,5]. However, because of differences in chemical composition and thermophysical properties, such as heat capacity, thermal expansion coefficient, thermal conductivity, melting temperature, and so forth, laser dissimilar welding often confronts problems of brittle intermetallic compounds [6], formation of unmixed zones [7], improper dilution [8], unevenly mixed elements [9], asymmetric weld patterns [10], and weld imperfections, such as distortion and cracking [8], which lead to poor joint quality [11,12]. The above-mentioned challenges mainly result from unexpected heat and mass transfer in the welding process [13,14].…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface-Active Element Oxygen on Heat and Mass Transfer in Laser Welding of Dissimilar Metals: Numerical and Experimental Study

Dong

et al. 2022

Metals

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The effects of the surface-active element oxygen on the laser welding of 304 stainless steel (304SS) and nickel were numerically and experimentally studied in pure argon and argon–oxygen mixed gas atmospheres containing 21% oxygen (AMO). In this study, the molten pool morphology, thermal behavior, solidification phenomenon, correlation between dilution and convection flow, and microhardness of welding joints were analyzed. As a result of oxygen effects, the molten pool was deeper, the maximum temperature was higher, and the maximum flow velocity was lower in the AMO. The cooling rate (GR) and combination parameter (G/R) were studied by the direct simulation of temperature gradient (G) and solidification growth rate (R). Combined with the solidification microstructure, it was found that oxygen had little effect on grain size. The major elements Fe, Cr, and Ni within the solidified molten pool in the AMO were uniformly diluted, while the distribution of the above elements was non-homogenous in pure argon. Stronger flow and multiple directions of convection inside the molten pool contributed to uniform dilution in the AMO. The distribution of microhardness was similar to the content of Cr, and the microhardness at the substrate interface of the joint was higher in the AMO than in pure argon. The preliminary conclusions of this study provide in-depth insights into the effects of surface-active element oxygen on heat and mass transfer in laser dissimilar welding.

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“…High-quality and reliable welding technology of NS-Mo must be developed before it can be widely applied in various structures. The appearance of a new molybdenum alloy NS-Mo and its wide application prospects have aroused a research upsurge in welding technology of molybdenum alloys [5,6,7,8,9,10].…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Input on Porosity Defects in a Fiber Laser Welded Socket-Joint Made of Powder Metallurgy Molybdenum Alloy

Xie

Shang

et al. 2019

Materials

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Porosity defects are still a challenging issue in the fusion welding of molybdenum and its alloys due to the pre-existing interior defects associated with the powder metallurgy process. Fiber laser welding of end plug and cladding tube made of nanostructured high-strength molybdenum (NS-Mo) alloy was performed in this work with an emphasis on the role of welding heat input. The distribution and morphology of porosity defects in the welded joints were examined by computed tomography (CT) and scanning electron microscopy (SEM). Preliminary results showed that laser welding of NS-Mo under low heat input significantly reduced the porosity defects in the fusion zone. The results of computed tomography (CT) showed that when the welding heat input decreased from 3600 J/cm (i.e., 1200 W, 0.2 m/min) to 250 J/cm (i.e., 2500 W, 6 m/min), the porosity ratio of the NS-Mo joints declined from 10.7% to 2.1%. Notable porosity defects under high heat input were related to the instability of the keyhole, expansion and the merging of bubbles in the molten pool, among which the instability of the keyhole played the dominant role. The porous defects at low heat input were generated as bubbles released from the powder metallurgy base metal (BM) did not have enough time to overflow and escape.

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Effects of minor Zr addition on the microstructure and mechanical properties of laser welded dissimilar joint of titanium and molybdenum

Cited by 20 publications

References 25 publications

Research Status and Progress of Welding Technologies for Molybdenum and Molybdenum Alloys

Research Status and Progress of Welding Technologies for Molybdenum and Molybdenum Alloys

Effect of Surface-Active Element Oxygen on Heat and Mass Transfer in Laser Welding of Dissimilar Metals: Numerical and Experimental Study

Effect of Heat Input on Porosity Defects in a Fiber Laser Welded Socket-Joint Made of Powder Metallurgy Molybdenum Alloy

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