ORCID Profile
0000-0001-8979-3577
Current Organisation
Shandong University
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Publisher: Elsevier BV
Date: 07-2021
Publisher: Trans Tech Publications, Ltd.
Date: 09-2013
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.768-769.289
Abstract: In this work a new method for analysis of neutron diffraction results obtained during “in situ” tensile load is proposed and tested. The methodology is based on the measurements of lattice strains during “in situ” tensile test for several hkl reflections and for different orientations of the s le with respect to the scattering vector. As the result the full stress tensor for preferred texture orientations in function of applied stress can be determined with help of crystallite group method. The experimental data are presented and compared with self-consistent model calculations performed for groups of grains corresponding to the measured hkl reflections.
Publisher: Trans Tech Publications, Ltd.
Date: 08-2017
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.905.9
Abstract: In the present work, the mechanical behavior of phases in duplex steel during tensile test was studied. Special interest was taken in the analysis of damage process just before failure. In this aim two diffraction methods: in-situ time of flight neutron diffraction and X-ray synchrotron diffraction were applied. Using diffraction data, the slip mechanism on crystallographic planes during plastic deformation was investigated. In the case of aged UR45N steel, it was found that significant softening caused by damage process was initiated in the ferritic phase. The lattice strains measured in situ by two above mentioned diffraction methods were compared with prediction of the self-consistent model.
Publisher: IOP Publishing
Date: 29-11-2006
Publisher: Trans Tech Publications, Ltd.
Date: 03-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.681.103
Abstract: Time of flight neutron diffraction method was applied to measure elastic lattice strains in austenitic steel during "in situ" tensile test. Comparing experimental data with self-consistent model, the critical resolved shear stress and hardening parameters were determined for polycrystalline grains. The result allowed us to determine the main component of the stress localization tensor, relating the rate of grain stress with the applied macrostress rate. The evolution of concentration tensor in function of the applied macrostress was analyzed. Finally, the load transfer between grains during yielding of the s le was studied.
Publisher: Trans Tech Publications, Ltd.
Date: 05-2010
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.652.155
Abstract: The lattice strains in large tensile deformations, up to the fracture of the s le were measured using neutron TOF method. For the first time, the range of large deformation was studied measuring lattice strain in the deformation neck and using special correction for macrostress value. It was found that during large plastic deformation the lattice stresses arise almost linearly with the macrostress value. The relaxation of elastic strains in some groups of ferritic grains (corresponding to reflections 211 and 200) can be connected with initiation of damage process in the ferritic phase.
Publisher: Elsevier BV
Date: 12-2010
Publisher: International Union of Crystallography (IUCr)
Date: 18-08-2011
DOI: 10.1107/S0021889811025957
Abstract: Owing to its selectivity, diffraction is a powerful tool for analysing the mechanical behaviour of polycrystalline materials at the mesoscale (phase and/or grain scale). In situ neutron diffraction during tensile tests and elastoplastic self-consistent modelling were used to study slip phenomena occurring on crystallographic planes at small and large deformation. The critical resolved shear stresses in both phases of duplex stainless steel were found for s les subjected to different thermal treatments. The evolution of grain loading was also determined by showing the large differences between stress concentration for grains in ferritic and austenitic phases. It was found that, for small loads applied to the s le, linear elastic deformation occurs in both phases. When the load increases, austenite starts to deform plastically, while ferrite remains in the elastic range. Finally, both phases undergo plastic deformation until s le fracture. By using an original calibration of diffraction data, the range of the study was extended to large s le deformation. As a result, mechanical effects that can be attributed to damage processes initiated in ferrite were observed.
Publisher: American Physical Society (APS)
Date: 17-01-2007
Publisher: Informa UK Limited
Date: 21-08-2012
Publisher: Elsevier BV
Date: 03-2013
Publisher: Elsevier BV
Date: 10-2020
No related grants have been discovered for Lihui (柏利慧) Bai.