MFM imaging of expanded austenite formed on 304 SS and CoCrMo alloys

Öztürk, O.; Fidan, Mehmet; Mändl, S.

doi:10.1016/j.surfcoat.2013.11.045

Cited by 9 publications

(4 citation statements)

References 33 publications

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“…Similarly for published results on the crystal structure, available literature on Mössbauer studies and magnetic properties of expanded austenite is focused on specimens with gradients in composition and residual stresses [7,20,21,[24][25][26][27], which is likely to influence the obtained results. In the current investigation the relation between interstitial content and magnetic properties is, for the first time, explored for homogeneous samples of nitrogen expanded austenite.…”

Section: Introductionmentioning

confidence: 99%

Composition-dependent variation of magnetic properties and interstitial ordering in homogeneous expanded austenite

et al. 2016

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Section: Introductionmentioning

confidence: 99%

Composition-dependent variation of magnetic properties and interstitial ordering in homogeneous expanded austenite

et al. 2016

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“…Similar MFM analyses of nitride austenitic stainless steel samples were reported in Refs. [74,83] .MFM imaging on polished cross-sections of nitrided steel samples revealed that such sub-grain magnetic domains appeared only in the outer part of a nitride layer, i.e. where the nitrogen supersaturation is higher than the inner part as confirmed by SEM-EDX linear scans.…”

Section: Structural Characterizations By Atomic (Magnetic) Force Micrmentioning

confidence: 79%

“…In the MFM images shown in Ref. [74], the magnetic domains exhibited elongated cellular patterns within each original austenite grain and the orientations of the domains in nearby grains differ from each other.…”

Section: Structural Characterizations By Atomic (Magnetic) Force Micrmentioning

confidence: 99%

From Micro to Nano Scales -Recent Progress in the Characterization of Nitrided Austenitic Stainless Steels

Luo¹

2015

Int J Nanomed Nanosurg

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In the frontier of materials science, understanding of materials has been in multiple scales from macro, micro, to atomic levels. This is attributed to the advanced instrumentations such as SEM, TEM, XPS, XRD, as well as several other spectroscopic and metallographic analyses. Fe-CrNi based austenitic stainless steels have a diverse range of modern applications ranging from biomedical prostheses in human bodies, food processing, to chemical engineering and nuclear power generation. The outstanding properties of the nitrided steels have attracted extensive research activities attempting to obtain a clear image on the structural characteristics of the structure, including nano-scale heterogeneity of the expanded austenite phase resulted from atomic-level chemical or electronic interactions in the alloying system. This paper provides a review on the structural characterization of nitrided austenitic stainless steels, with an emphasis on the latest experimental findings through the use of these sophisticated analytical tools. In the final section, several possible aspects of future studies are discussed.

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“…The color-contrast MFM images in Figure 8 show distinct, dark and bright stripes, indicating the presence of a magnetic domain structure. Because the MFM tip is magnetized downward, the bright stripe domains are magnetized in an upward direction, whereas the dark domains are magnetized in a downward direction [28]. Figure 9 shows the acoustic signal and the spectrum of the ultrasonic wave.…”

Section: Resultsmentioning

confidence: 99%

Nondestructive Evaluation of Strain-Induced Phase Transformation and Damage Accumulation in Austenitic Stainless Steel Subjected to Cyclic Loading

Kim

2017

Metals

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Strain-induced phase transformation and damage accumulation in austenitic stainless steel subjected to cyclic loading were investigated by nondestructive evaluation. The cyclic loading test was performed at various strain amplitudes at the same strain rate. The volume fraction of the strain-induced phase transformation (α -martensite) was determined by ferrite scope and magnetic coercivity measurement. The damage accumulation and microstructure of cyclic loading specimens were characterized by microstructural observation. The cyclic hardening and cyclic softening behavior are discussed in terms of the generation of strain-induced martensite phases and a dislocation substructure at each strain amplitude. The volume fraction of the strain-induced phase increased with the strain amplitude. The increase in α -martensite was evaluated by measuring the ultrasonic nonlinearity parameter. The presence of α -martensite is sufficient to distort the austenitic matrix due to an interface misfit between the austenite matrix and α -martensite, resulting in wave distortion of the longitudinal wave. From this wave distortion, super-harmonics may be generated with nucleation of the strain-induced martensite, a process that strongly depends on the strain amplitude.

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MFM imaging of expanded austenite formed on 304 SS and CoCrMo alloys

Cited by 9 publications

References 33 publications

Composition-dependent variation of magnetic properties and interstitial ordering in homogeneous expanded austenite

Composition-dependent variation of magnetic properties and interstitial ordering in homogeneous expanded austenite

From Micro to Nano Scales -Recent Progress in the Characterization of Nitrided Austenitic Stainless Steels

Nondestructive Evaluation of Strain-Induced Phase Transformation and Damage Accumulation in Austenitic Stainless Steel Subjected to Cyclic Loading

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