Small-scale mechanical property characterization of ferrite formed during deformation of super-cooled austenite by nanoindentation

Ahn, Tae-Hong; Um, Kyung-Keun; Choi, Jin-Won; Kim, Do Hyun; Oh, Kyu Hwan; Kim, Miyoung; Han, Heung Nam

doi:10.1016/j.msea.2009.05.050

Cited by 15 publications

(2 citation statements)

References 17 publications

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“…In the case of κ-carbide, most reflections overlap with those of austenite, and therefore its lattice parameter was determined indentations located inside the grains sufficiently far away from the grain boundaries were selected for analysis, guided by a scanning probe microscope (SPM). This made it possible to evaluate grain morphologies and precisely identify the areas where the indentation was performed [5,[20][21][22][23]. Statistical information about nano-hardness of constitutional phases was obtained using indentation data of at least 11 points for each phase.…”

Section: Methodsmentioning

confidence: 99%

Effect of aging treatment on microstructure and intrinsic mechanical behavior of Fe–31.4Mn–11.4Al–0.89C lightweight steel

Lee

Park

Lee

et al. 2016

Journal of Alloys and Compounds

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Section: Methodsmentioning

confidence: 99%

Effect of aging treatment on microstructure and intrinsic mechanical behavior of Fe–31.4Mn–11.4Al–0.89C lightweight steel

Lee

Park

Lee

et al. 2016

Journal of Alloys and Compounds

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“…Extensive research has been carried out on nanoindentation technology in the past fifteen years. As a higher spatial resolution detection technology, nanotechnology has the characteristics of simple and non-destructive sample preparation [14]. By recording continuous indentation displacement and pressing force, it can be used to measure the mechanical properties such as hardness, elastic modulus and plastic properties in the heat affected zone of welding joints.…”

Section: Introductionmentioning

confidence: 99%

Characterization of microscopic mechanical performance for welded joint of 9% Ni steel using nanoindentation

Hao

Chen

et al. 2019

Eng. Res. Express

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Nanoindentation test, transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were introduced to investigate the mechanical properties and microstructure of microscopic regions of the nickel-based welded joint. Five indentation series were performed across the weld zone including base metal (BM), coarse grained heat affected zone (CGHAZ), partially melted zone (PMZ), weld metal near the partially melted zone and weld metal center (WM). The mechanical properties (E, H, and n) were then estimated from the load on sample-displacement into surface curves (P-h) data of nanoindentation and SEM analysis results. The results showed that the average nano-hardness value (H) was obviously increased in the CGHAZ. WM has the highest values of elastic modulus (E). BM has the highest plastic rheology stress exponent (n). At the same time, the relationship between the plastic rheology depth and the plastic rheology was also discussed.

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Influence of Thermal Aging on the Microstructure and Mechanical Behavior of Dual-Phase, Precipitation-Hardened, Powder Metallurgy Stainless Steels

Stewart

Williams

Chawla

2011

Metall Mater Trans A

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i ABSTRACT Increasing demand for high strength powder metallurgy (PM) steels has resulted in the development of dual phase PM steels. In this work, the effects of thermal aging on the microstructure and mechanical behavior of dual phase precipitation hardened powder metallurgy (PM) stainless steels of varying ferritemartensite content were examined. Quantitative analyses of the inherent porosity and phase fractions were conducted on the steels and no significant differences were noted with respect to aging temperature. Tensile strength, yield strength, and elongation to fracture all increased with increasing aging temperature reaching maxima at 538 o C in most cases. Increased strength and decreased ductility were observed in steels of higher martensite content. Nanoindentation of the individual microconstituents was employed to obtain a fundamental understanding of the strengthening contributions. Both the ferrite and martensite hardness values increased with aging temperature and exhibited similar maxima to the bulk tensile properties.Due to the complex non-uniform stresses and strains associated with conventional nanoindentation, micropillar compression has become an attractive method to probe local mechanical behavior while limiting strain gradients and contributions from surrounding features. In this study, micropillars of ferrite and martensite were fabricated by focused ion beam (FIB) milling of dual phase precipitation hardened powder metallurgy (PM) stainless steels. Compression testing was conducted using a nanoindenter equipped with a flat punch indenter.The stress-strain curves of the individual microconstituents were calculated from ii the load-displacement curves less the extraneous displacements of the system.

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Small-scale mechanical property characterization of ferrite formed during deformation of super-cooled austenite by nanoindentation

Cited by 15 publications

References 17 publications

Effect of aging treatment on microstructure and intrinsic mechanical behavior of Fe–31.4Mn–11.4Al–0.89C lightweight steel

Effect of aging treatment on microstructure and intrinsic mechanical behavior of Fe–31.4Mn–11.4Al–0.89C lightweight steel

Characterization of microscopic mechanical performance for welded joint of 9% Ni steel using nanoindentation

Influence of Thermal Aging on the Microstructure and Mechanical Behavior of Dual-Phase, Precipitation-Hardened, Powder Metallurgy Stainless Steels

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