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Instruments / Technical Area	Publication Details	Published	Actions
I12-JEEP: Joint Engineering, Environmental and Processing	The relationship between strain-age cracking and the evolution of γ′ in laser powder-bed-fusion processed Ni-Based superalloys J. F. S. Markanday , N. D’souza , N. L. Church , J. R. Miller , J. J. C. Pitchforth , L. D. Connor , S. Michalik , B. Roebuck , N. G. Jones , K. A. Christofidou , H. J. Stone Superalloys 2024 DOI: 10.1007/978-3-031-63937-1_77 Diamond Proposal Number(s): [33375] Show Abstract ▼ Abstract: Factors affecting strain-age cracking (SAC) have been quantitatively assessed in a range of Ni-base superalloys with differing γ′ contents. Differences in the amount of γ′ present in the as-built condition of HA282, STAL 15DE, CM247LC, and IN713LC are highlighted. In the as-built condition, γ′ are absent in HA282, but appear as nano-clusters in IN713LC. On heating, γ′ precipitates coherently in the γ phase, increasing the yield strength. The kinetics of precipitation are dependent on the heating rate and precipitation terminates at different temperatures in different alloys. The propensity to SAC is assessed via volume changes accompanying precipitation, increase in elastic modulus accompanying γ′ precipitation, and a loss in ductility/grain boundary cohesive strength with increasing temperature. A marked feature of additively built microstructures is the dramatically low grain boundary cohesive strength at ~800 °C, which is related to the segregation within the terminal liquid film at the grain boundary. The most important factor contributing to SAC is the lack of ductility and reduced grain boundary cohesive strength.	Aug 2024
I11-High Resolution Powder Diffraction	In situ study of sigma phase formation in Cr–Co–Ni ternary alloys at 800°C using the long duration experiment facility at Diamond Light Source L. D. Connor , P. M. Mignanelli , K. A. Christofidou , N. G. Jones , A. R. Baker , C. C. Tang , S. Guérin , H. J. Stone Journal Of Synchrotron Radiation 25 DOI: 10.1107/S1600577518009475 Diamond Proposal Number(s): [13173] Open Access Show Abstract ▼ Abstract: The new long duration experiment facility on beamline I11 at Diamond Light Source has been used to study the kinetics of sigma phase formation in three Cr–Co–Ni alloys. Diffraction data acquired during in situ exposure at 800°C for 50 d showed progressive increases in the sigma fraction. This was accompanied by changes in the proportions of the other phases, which differed markedly between the alloys studied. These results demonstrate the capabilities of the long duration facility for the study of metallurgical phenomena over periods of months to years, a capability not previously available at a synchrotron source.	Sep 2018

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