Three-Orthogonal-Direction Stress Mapping around a Fatigue-Crack Tip Using Neutron Diffraction

Huang, E-Wen; Lee, Soo Yeol; Woo, Wanchuck; Lee, Kuan Wei

doi:10.1007/s11661-011-0904-8

Cited by 10 publications

(4 citation statements)

References 31 publications

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“…In-situ neutron-diffraction measurements were carried out using the VULCAN engineering diffractometer at the Spallation Neutron Source (SNS) of the Oak Ridge National Laboratory (ORNL) [31][32][33][34]. The neutron-diffraction profiles were recorded simultaneously in both loading and transverse directions using two orthogonal detectors situated at ±90 • from the incident neutron beam.…”

Section: Methodsmentioning

confidence: 99%

Transient Phase-Driven Cyclic Deformation in Additively Manufactured 15-5 PH Steel

Lam

Liu

et al. 2022

Materials

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The present work extends the examination of selective laser melting (SLM)-fabricated 15-5 PH steel with the 8%-transient-austenite-phase towards fully-reversed strain-controlled low-cycle fatigue (LCF) test. The cyclic-deformation response and microstructural evolution were investigated via in-situ neutron-diffraction measurements. The transient-austenite-phase rapidly transformed into the martensite phase in the initial cyclic-hardening stage, followed by an almost complete martensitic transformation in the cyclic-softening and steady stage. The compressive stress was much greater than the tensile stress at the same strain amplitude. The enhanced martensitic transformation associated with lower dislocation densities under compression predominantly governed such a striking tension-compression asymmetry in the SLM-built 15-5 PH.

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Section: Methodsmentioning

confidence: 99%

Transient Phase-Driven Cyclic Deformation in Additively Manufactured 15-5 PH Steel

Lam

Liu

et al. 2022

Materials

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“…In [5] we have developed and tested a method for estimating the shape and the size of PSZ by systematic measurement of microhardness. The volume of data obtained by this method and the information it gives are not inferior to those obtained by the laborious method of estimation of PSZ with the help of x-ray analysis [6,7] or EBSD [8,9].…”

Section: Introductionmentioning

confidence: 97%

Possibility of Prediction of Properties of High-Toughness Materials by Complex Analysis of the Size of Zones of Plastic Strain and Other Parameters of Steel 09G2S

et al. 2016

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Relations between the parameters of dynamic crack resistance, impact toughness, sizes of zones of plastic strain in the start region, hardness of the unstrained material, strength characteristics, and tempering temperature of steel 09G2S are determined. The linear regression equations are used to construct mathematical and graphical models for predicting the level of properties in quenched and tempered steel 09G2S. The method is used to predict the properties of a tubular billet from steel 09G2S with composition somewhat different from the rated one after quenching and high tempering at 570°C.

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“…Nondestructive diffraction mapping can estimate plastic zone sizes by comparing diffraction patterns of the gauged plastically-deformed regions. The residual lattice strains and peak widths can correlate the distribution of the dislocation density locally [10]. On the other hand, several theoretical models have provided possible mechanisms for microstructure predictions, such as ab initio, tight-binding, and embedded-atom calculations [11].…”

Section: Introductionmentioning

confidence: 99%

Plasticity Enhancement by Fe-Addition on NiAl Alloy: A Synchrotron X-ray Diffraction Mapping and Molecular Dynamics Simulation Study

Huang

Lam

Chang

et al. 2018

QuBS

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Unalloyed nickel aluminide has important applications but lacks ductility at room temperature. In this study, iron-added nickel aluminide alloys exhibit plasticity enhancement. The nickel aluminide alloys are prepared with different iron contents (0, 0.25, and 1 at%) to study their plasticity. The indentation-induced deformed areas are mapped by the synchrotron X-ray diffraction to compare their plastic zones. A complimentary tight binding calculation and generalized embedded atom method demonstrate how the Fe-addition enhances the plasticity of the iron-added nickel aluminide alloys.

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Three-Orthogonal-Direction Stress Mapping around a Fatigue-Crack Tip Using Neutron Diffraction

Cited by 10 publications

References 31 publications

Transient Phase-Driven Cyclic Deformation in Additively Manufactured 15-5 PH Steel

Transient Phase-Driven Cyclic Deformation in Additively Manufactured 15-5 PH Steel

Possibility of Prediction of Properties of High-Toughness Materials by Complex Analysis of the Size of Zones of Plastic Strain and Other Parameters of Steel 09G2S

Plasticity Enhancement by Fe-Addition on NiAl Alloy: A Synchrotron X-ray Diffraction Mapping and Molecular Dynamics Simulation Study

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