Electron beam welding of Nimonic 80A: Integrity and microstructure evaluation

Zhang, H.; Li, J.K.; Guan, Zhongwei; Liu, Y.J.; Qi, Dekang; Wang, Hongtao

doi:10.1016/j.vacuum.2018.01.021

Cited by 22 publications

(3 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To conclude, it can be said that a higher number of fatigue cycles are required to increase the FGA size. This phenomenon was also observed by Sakai et al [26,29] in SUJ2 steel.…”

Section: Discussionsupporting

confidence: 81%

“…Under the high-power electron microscope, the fatigue striations could be observed in the crack propagation zone perpendicular to the crack propagation direction, as shown in Figure 8e. This shows a high number of fatigue cycles consumed in the crack initiation and early propagation, even reaching the majority of the total fatigue life [22,29,30]. The upper and lower crack faces are pressed against each other to form a smooth and flat "fisheye" region, and later the fatigue cracks propagated rapidly forming rough cleavage planes [22].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Influence of Welded Pores on Very Long-Life Fatigue Failure of the Electron Beam Welding Joint of TC17 Titanium Alloy

et al. 2019

View full text Add to dashboard Cite

The electron beam welding process is widely used in the connection among titanium alloy material parts of aero-engines. Its mechanical properties need to meet the requirements of long life and high reliability. In this paper, the static strength and the fatigue failure behavior of the electron beam weldments of TC17 titanium alloy were investigated experimentally under low amplitude high frequency (20 kHz), and the mechanical response and failure mechanism under different external loading conditions were analyzed. In summary, the samples were found to have anisotropic microstructure. The tensile strength of the PWHT of TC17 EBW joint was ~4.5% lower than that of the base metal. Meanwhile, compared with the base metal, the fatigue strength was reduced by 45.5% at 109 cycles of fatigue life. The fracture analysis showed that the fatigue failure of the welded joint of TC17 alloy was caused by the welded pores and the fatigue cracks initiated from the welded pores. A fine granular area (FGA) was observed around the crack initiation region. The existence of pores caused the stress intensity factor of the fine granular area (KFGA) to be inversely proportional to the fatigue life. The KFGA calculation formula was modified and the fatigue crack propagation threshold of the welded joint of TC17 alloy was calculated (3.62 MPa·m1/2). Moreover, the influences of the effective size and the relative depth of the pores on the very long fatigue life of the electron beam welded joint of TC17 titanium alloy were discussed.

show abstract

“…To conclude, it can be said that a higher number of fatigue cycles are required to increase the FGA size. This phenomenon was also observed by Sakai et al [26,29] in SUJ2 steel.…”

Section: Discussionsupporting

confidence: 81%

Section: Resultsmentioning

confidence: 99%

Influence of Welded Pores on Very Long-Life Fatigue Failure of the Electron Beam Welding Joint of TC17 Titanium Alloy

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Therefore, a more advanced technique is needed to solve such issues. The electron beam welding (EBW) technique shows the feature of high energy density, and uses a high-speed moving electron beam to impact the alloys' surfaces and melt them [9][10][11][12]. EBW favors the production of deep, narrow joints, which in turn reduces the extension of the HAZ and possible deformations, high stress or stress-induced internal cracks, making it a promising joint method [13].…”

Section: Introductionmentioning

confidence: 99%

Impact performance and microstructures of thick TA1 titanium alloy sheets welded by vacuum electron beam

Su¹,

Li²,

Qi³

et al. 2019

Phys. Scr.

View full text Add to dashboard Cite

Thick TA1 titanium alloy sheets were thoroughly bonded by vacuum electron beam welding (EBW). The results indicated that microstructures in the weld zone (WZ) consisted of coarse α columnar grains, serrated α as well as needle-shaped α′; the microstructure in the heat-affected zone near the WZ side was composed of α′ and α, while the microstructure near the base metal side consisted of α″ and α. The positional relation between the notches and rolling direction had an important role in the impact performance. The EBW joint exhibited higher absorbed impact energy at the weld seam after local heat treatment. Furthermore, lots of dimples were produced on the impact fracture surfaces, exhibiting ductile fractures.

show abstract

Study of the effect of laser beam welding on joint of Nimonic 80A superalloy: an experimental approach

Saurabh,

Chand,

Yadav

2024

Int J Adv Manuf Technol

View full text Add to dashboard Cite

Electron beam welding of Nimonic 80A: Integrity and microstructure evaluation

Cited by 22 publications

References 22 publications

Influence of Welded Pores on Very Long-Life Fatigue Failure of the Electron Beam Welding Joint of TC17 Titanium Alloy

Influence of Welded Pores on Very Long-Life Fatigue Failure of the Electron Beam Welding Joint of TC17 Titanium Alloy

Impact performance and microstructures of thick TA1 titanium alloy sheets welded by vacuum electron beam

Study of the effect of laser beam welding on joint of Nimonic 80A superalloy: an experimental approach

Contact Info

Product

Resources

About