Influence of crystal orientation on hardness and nanoindentation deformation in ion-irradiated stainless steels

Miura, Terumitsu; Fujii, K.; Fukuya, Koji; Takashima, Keisuke

doi:10.1016/j.jnucmat.2010.12.197

Cited by 30 publications

(15 citation statements)

References 8 publications

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“…Refs. [17,36,37]). The samples were indented onto the surface along the same direction as the ion beam irradiation using a Berkovich tip (three sided pyramid which is selfsimilar and has a half angle of 65 , and a tip radius of about 100 nm).…”

Section: Nanoindentation Measurementsmentioning

confidence: 99%

Characterization of ion irradiation effects on the microstructure, hardness, deformation and crack initiation behavior of austenitic stainless steel:Heavy ions vs protons

Gupta

Hure

Tanguy

et al. 2018

Journal of Nuclear Materials

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao. Proton irradiation is generally used as a representative alternative of neutron irradiation to improve the current understanding of the mechanisms involved in IASCC. This study assesses the possibility of using heavy ions irradiation to evaluate IASCC mechanisms by comparing the irradiation induced modifications (in microstructure and mechanical properties) and cracking susceptibility of SA 304 L after both type of irradiations: Fe irradiation at 450 C and proton irradiation at 350 C. Irradiation-induced defects are characterized and quantified along with nano-hardness measurements, showing a correlation between irradiation hardening and density of Frank loops that is well captured by Orowan's formula. Both irradiations (iron and proton) increase the susceptibility of SA 304 L to intergranular cracking on subjection to Constant Extension Rate Tensile tests (CERT) in simulated nominal PWR primary water environment at 340 C. For these conditions, cracking susceptibility is found to be quantitatively similar for both irradiations, despite significant differences in hardening and degree of localization.

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Section: Nanoindentation Measurementsmentioning

confidence: 99%

Characterization of ion irradiation effects on the microstructure, hardness, deformation and crack initiation behavior of austenitic stainless steel:Heavy ions vs protons

Gupta

Hure

Tanguy

et al. 2018

Journal of Nuclear Materials

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“…As it is evident in the BF-TEM image, the deformation features under the imprint are heterogeneous, showing a higher shear band density near one indenter side than in the other. This phenomenon may be related to the asymmetry of the Berkovich indenter, which produces a different stress state on each indenter side, as was already discussed by Miura et al [30]. Furthermore, as can be seen in Fig.…”

Section: U N C O R R E C T E D P R O O F Jj Roa Et Al Materials Scmentioning

confidence: 55%

Influence of testing mode on the fatigue behavior of <111> austenitic grain at the nanometric length scale for TRIP steels

Roa

Sapezanskaia

Fargas

et al. 2018

Materials Science and Engineering: A

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Metastable austenitic stainless steels, and in particular the TRansformation Induced Plasticity steels, rely on a phase transformation from a ductile austenite to a slightly harder martensite. These materials under fatigue testing conditions at the macrometric length scale can induce a softening or hardening effect as a function of the underlying deformation feature activated. Thus, given the interaction of single grains in polycrystalline materials, the collective response to macroscopic fatigue testing is not trivial to interpret. Within this context, small scale tests are required to obtain a more in detail understanding of the fatigue properties at the local level of those materials. In this regard, cyclic nanoindentation tests represent a suitable technique to give insight on the local fatigue of metastable stainless steels for a certain crystallographic orientation. In this experimental work, the influence of the testing mode (loading and/or displacement control mode) on the fatigue behavior of <111> austenitic grains as a function of their micromechanical properties as well as their deformation features was investigated in detail. It was found that the experiments done under loading control mode could be compared to conventional low cycle fatigue tests. In contrast when experiments were performed under displacement control mode they may be compared to high cycle fatigue tests. Furthermore, the microstructural observation by transmission electron microscopy allowed to observe the formation of shear bands. This phenomenon preceded the apparition of martensitic laths during the cyclic indentation process.

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“…Considering the ratio of hardness to tensile yield strength is not always consistent with a factor of 3 32) and the existence of orientation dependence on hardness. 33,34) We proposed that H 0 can be presented as H 0 = cM¸where c is a constant.…”

Section: Resultsmentioning

confidence: 99%

Crystallographic Dependence on Deformation Characteristics of Friction Stir Processed Pure Aluminum

2013

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Anisotropic deformation behaviors of the friction stir processed dynamic recrystallized commercial pure aluminum alloys were studied in this study. Recrystallized and refined grain size can be acquired after friction stir process is conducted. However, this is not guaranteed of isotropic deformation characteristics. Microhardness profile within the friction stir processed region is crystallographic orientation dependence. This dependence is manifested properly by the corresponding average Taylor factors.

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Influence of crystal orientation on hardness and nanoindentation deformation in ion-irradiated stainless steels

Cited by 30 publications

References 8 publications

Characterization of ion irradiation effects on the microstructure, hardness, deformation and crack initiation behavior of austenitic stainless steel:Heavy ions vs protons

Characterization of ion irradiation effects on the microstructure, hardness, deformation and crack initiation behavior of austenitic stainless steel:Heavy ions vs protons

Influence of testing mode on the fatigue behavior of <111> austenitic grain at the nanometric length scale for TRIP steels

Crystallographic Dependence on Deformation Characteristics of Friction Stir Processed Pure Aluminum

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