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Instruments / Technical Area	Publication Details	Published	Actions
I12-JEEP: Joint Engineering, Environmental and Processing	Investigation of ductile damage in dual phase steel during tensile deformation by in situ X-ray computed tomography Jiadong Chen , Oxana V. Magdysyuk , Xiao Li , Philip J. Withers , Kun Yan Engineering Fracture Mechanics 46 DOI: 10.1016/j.engfracmech.2023.109711 Diamond Proposal Number(s): [13234] Open Access Show Abstract ▼ Abstract: In situ synchrotron radiation X-ray computed tomography (CT) is used to understand the void nucleation and growth behaviour of dual phase (DP) steel, DP800, during uniaxial tensile deformation. The voids were identified post mortem as having nucleated primarily in the (41 vol%) martensite phase. The behaviour of individual voids was found to be broadly in line with a Rice and Tracey style growth model (their volume increasing by a factor of 10), while the mean void size was broadly in line with a model that included the continuous nucleation of new voids, as well as the growth of existing voids, throughout straining. Voids tended to elongate during uniaxial (low triaxiality) straining, but then to dilate more isotropically as necking led to increased triaxiality. One large pre-existing void was found to elongate quicky at first, but then for growth to slow, presumably because it was not located in the highest triaxial stress (necked) region. Perhaps surprisingly the average size of the void population grows only slowly (by a factor of 2) during straining; this is because while the size of each void grows, new small voids are always being nucleated. Finally, the changes of stress triaxiality and shear stress state during tensile deformation of the square cross-section smooth tensile specimen are investigated via finite element modelling, to qualitatively assess the impact of sample geometry on void nucleation behaviour and fracture strain in the current study.	Nov 2023
I15-Extreme Conditions	Solidification microstructure and residual stress correlations in direct energy deposited type 316L stainless steel Da Guo , Kun Yan , Mark D. Callaghan , Dominik Daisenberger , Mark Chatterton , Jiadong Chen , Andrew Wisbey , Wajira Mirihanage Materials & Design DOI: 10.1016/j.matdes.2021.109782 Diamond Proposal Number(s): [20605] Open Access Show Abstract ▼ Abstract: Localized fluctuation in residual stress distribution for direct energy deposited 316L stainless steel thin plate was revealed through high-energy synchrotron X-ray diffraction. The macroscopic residual stress levels are changed steadily across the article according to the characteristic cooling rates, as implied by the measured dendrite arm lengths. Localized fluctuations of residual stress in the length scale, between 500 to 600 µm, coincides well with the morphological variations of the solidification microstructure that formed during direct energy deposition. Computations indicate a greater propensity for related mesoscopic thermal gradient fluctuations along the solidification front of the moving melt pool. Novel perspectives on residual stress across multiple length-scales and its relevance to the formation of solidification microstructure in metal additive manufacturing is analysed by considering the experimental results.	May 2021

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