Influence of carbide distribution on ductility of Haynes®282® forgings
Paper i proceeding, 2016

Haynes®282®, a relatively new superalloy is used in gas turbines in form of sheets, plates and forgings. Forgings undergo a series of deformation steps at high temperatures to form complex shapes of components. The deformation on forgings, changes the microstructural features and their distribution, and any change in distribution of microstructural features can affect the mechanical properties of the material. The present study is undertaken to investigate the possible causes of anisotropy in mechanical properties of a Haynes®282® forging through optical and electron microscopy. Microscopic investigations show that ductility is anisotropic and changes from 15% to 21%. The electron backscattered diffraction (EBSD) investigation reveals that the presence of carbide stringers (banding of MC and M6C carbides) is associated with fine grains, thereby giving a bimodal distribution of grain size. Carbide stringers follow the complexity of forgings and are identified as the primary cause for the anisotropic behavior in ductility. Furthermore, micromechanical simulations of carbide stringers in association with a bimodal grain structure was seen to qualitatively correspond to the experimental observation indicating improved ductility with banding along the tensile axis.



Anisotropic ductility


Ceena Joseph

Chalmers, Material- och tillverkningsteknik, Materialteknologi

Magnus Hörnqvist Colliander

Chalmers, Fysik, Biologisk fysik

Rebecka Brommesson

Chalmers, Tillämpad mekanik, Material- och beräkningsmekanik

Christer Persson

Chalmers, Material- och tillverkningsteknik, Materialteknologi

13th International Symposium on Superalloys, SUPERALLOYS 2016, Seven Springs Mountain Resort Seven Springs, United States, 11 September 2016 through 15 September 2016