Evolution of helium bubbles in SLM 316L stainless steel irradiated with helium ions at different temperatures

Fu, Chonglong; Jianjian, Li; Bai, Juju; Lei, Qiantao; Liu, Renduo; Lin, Jun

doi:10.1016/j.jnucmat.2022.153609

Cited by 11 publications

(4 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results indicate that the growth and accumulation of the He bubbles in the SLM 316L sample is suppressed, thus showing a smaller average size of bubbles compared to that of the CR 316L sample. These findings are in good agreement with the trends in previous studies [8,13]. Considering that the two types of 316L samples with similar chemical compositions and crystal structures were subjected to the same He irradiation condition, it can be inferred that the formation and growth of bubbles are inhibited due to the differences introduced by the SLM fabrication process.…”

Section: He Bubbles In Cr 316l and Slm 316l Samplessupporting

confidence: 92%

“…For example, Sun et al [8] demonstrated the great He radiation tolerance of SLM 316L, which is due to the interfaces composed of cellular sub-grains and nano-inclusions. Similarly, the inhibition effects of dislocation structures and oxide-matrix interfaces on bubble evolution were confirmed at elevated temperatures of 800 • C [13]. Furthermore, Song et al [14] recently reported the improved resistance of irradiation-assisted stress corrosion cracking (IASCC) in hot-isotropic pressed AM 316L compared to that in conventionally forged 316L under proton irradiation.…”

Section: Introductionmentioning

confidence: 85%

See 1 more Smart Citation

The Mechanisms of Inhibition Effects on Bubble Growth in He-Irradiated 316L Stainless Steel Fabricated by Selective Laser Melting

et al. 2023

View full text Add to dashboard Cite

The AISI 316L austenitic stainless steel fabricated by selective laser melting (SLM) is considered to have great prospects for applications in nuclear systems. This study investigated the He-irradiation response of SLM 316L, and several possible reasons for the improved He-irradiation resistance of SLM 316L were systematically revealed and evaluated by using TEM and related techniques. The results show that the effects of unique sub-grain boundaries have primary contributions to the decreased bubble diameter in SLM 316L compared to that in the conventional 316L counterpart, while the effects of oxide particles on bubble growth are not the dominant factor in this study. Moreover, the He densities inside the bubbles were carefully measured using electron energy loss spectroscopy (EELS). The mechanism of stress-dominated He densities in bubbles was validated, and the corresponding reasons for the decrease in bubble diameter were freshly proposed in SLM 316L. These insights help to shed light on the evolution of He bubbles and contribute to the ongoing development of the steels fabricated by SLM for advanced nuclear applications.

show abstract

Section: He Bubbles In Cr 316l and Slm 316l Samplessupporting

confidence: 92%

Section: Introductionmentioning

confidence: 85%

The Mechanisms of Inhibition Effects on Bubble Growth in He-Irradiated 316L Stainless Steel Fabricated by Selective Laser Melting

et al. 2023

View full text Add to dashboard Cite

show abstract

“…These values of energy E a are calculated to be 0.8796 eV, 0.1737 eV, and 0.7009 eV for samples FeCoNiCr, HEA-16, and HEA-63, respectively. The experimental results of Zell show that the apparent activation energy for pure nickel is equal to 0.45 eV in a temperature range of 523 K-800 K. [60] In addition, the results of Jublot-Leclerc et al showed that the apparent activation energy for 316L SS is 0.39 eV at 723 K-823 K. [61] According to the results of Fu et al, [62] the apparent activation energy of helium bubbles shows a temperature dependence, which is due to the fact that the stable existence of helium bubbles is influenced not only by the nucleation course of helium atoms, but also by the process of diffusion and growth of He bubbles. During the irradiation experiments, vacancies are mobile at high temperatures of 673 K and are annihilated at phase boundaries, which suppresses the nucleation and growth of helium bubbles.…”

Section: The E a For Helium Bubblesmentioning

confidence: 98%

Evolution of helium bubbles in FeCoNiCr-based high-entropy alloys containing γ′ nanoprecipitates

Feng 冯,

Jiang 蒋,

Hu 胡

et al. 2024

Chinese Phys. B

View full text Add to dashboard Cite

A series of high-entropy alloys (HEAs) containing nanoprecipitates of varying sizes were successfully prepared by a non-consuming vacuum arc melting method. In order to study the irradiation evolution of helium bubbles in the FeCoNiCr-based HEAs with γ' precipitates, samples were irradiated with 100 keV helium ions to a fluence of 5 × 1020 ions/m2 at 293 K and 673 K. And the room temperature irradiated samples were annealed at different temperatures to examine the diffusion behavior of helium bubbles. Transmission electron microscope (TEM) was employed to characterize the structural morphology of precipitated nanoparticles and the evolution of helium bubbles. Experimental results reveal that nanosized, spherical, dispersed, coherent and ordered L12-type Ni3Ti γ' precipitations were introduced in FeCoNiCr(Ni3Ti)0.1 HEAs by means of ageing treatments at temperatures between 1073-1123 K. Under the ageing treatment conditions applied in this work, γ' nanoparticles were precipitated in FeCoNiCr(Ni3Ti)0.1 HEAs with average diameters of 15.80 nm, 37.00 nm and 62.50 nm, respectively. The average sizes of helium bubbles observed in samples after 673 K irradiation were 1.46 nm, 1.65 nm and 1.58 nm, respectively. The improvement in the irradiation resistance of FeCoNiCr(Ni3Ti)0.1 HEAs was evidenced by the diminution in bubbles size. Furthermore, FeCoNiCr(Ni3Ti)0.1 HEAs containing γ' precipitates of 15.8 nm exhibited the minimum size and density of He bubbles, which can be ascribed to the considerable helium trapping effects of heterogeneous coherent phase boundaries. Subsequently, annealing experiments conducted after 293 K irradiation indicate that HEAs containing precipitated phases exhibit smaller apparent activation energies (Ea) for helium bubbles, resulting in larger helium bubble sizes. This study provides guidance on improving the irradiation resistance of L12-strengthened high-entropy alloys.

show abstract

“…Selective laser melting is one of the most popular and promising additive manufacturing techniques and has a low energy cost, low swelling rate, and high precision [ 11 , 12 ]. It molds materials layer-by-layer using a laser beam as well as a moving and cooling system to achieve rapid melting and solidification, which is beneficial for producing parts with high density and fine-grained microstructures [ 13 ].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Strength–Ductility Synergy Properties in Selective Laser Melted 316L Stainless Steel by Strengthening Grinding Process

et al. 2022

View full text Add to dashboard Cite

Selective laser melted (SLM) 316L stainless steel (SS) has been widely employed in the fields of designing and manufacturing components with complex shapes and sizes. However, the low yield strength, low ultimate tensile stress, and low hardness of SLM 316L SS components hinder its further application. In this work, the strengthening grinding process (SGP) was used to enhance the mechanical properties of SLM 316L SS. The microhardness, residual stress, microstructure, and tensile properties of all the samples were analyzed. The results demonstrate that the SGP induced higher compressive residual stress and microhardness, as well as higher tensile properties. The maximum hardness and residual stress reached 354.5 HV and −446 MPa, respectively, indicating that the SGP resulted in a plastic deformation layer over 150 μm. The possible mechanisms have been discussed in further detail. Compared to the untreated sample, the SGP sample shows a significant improvement in yield strength (YS), ultimate tensile stress (UTS), and elongation (EL), increasing 30%, 25.5%, and 99.1%, respectively. This work demonstrates that SGP treatment could be an efficient approach to simultaneously improving the strength and ductility of the SLM 316L SS, which makes it more suitable for engineering applications.

show abstract

Evolution of helium bubbles in SLM 316L stainless steel irradiated with helium ions at different temperatures

Cited by 11 publications

References 41 publications

The Mechanisms of Inhibition Effects on Bubble Growth in He-Irradiated 316L Stainless Steel Fabricated by Selective Laser Melting

The Mechanisms of Inhibition Effects on Bubble Growth in He-Irradiated 316L Stainless Steel Fabricated by Selective Laser Melting

Evolution of helium bubbles in FeCoNiCr-based high-entropy alloys containing γ′ nanoprecipitates

Enhanced Strength–Ductility Synergy Properties in Selective Laser Melted 316L Stainless Steel by Strengthening Grinding Process

Contact Info

Product

Resources

About