Anisotropy of Room Temperature Ductility in Haynes 282 Forgings

Haynes (R) 282 (R) is relatively new nickel base superalloy, offering excellent mechanical properties and attracting interest from the gas turbine and aerospace industry. One of the criteria for meeting specification requirements is the room temperature ductility.In this paper specimens from forgings were tested for room temperature ductility in the longitudinal transversal (LT) and short transversal (ST) directions. The results show large anisotropy in ductility, varying from approximately 25% in LT to 12% in the ST direction. Fractographic and metallographic analysis show the presence of MC and M6C carbide banding. Failure in both ST and LT direction was ductile with intergranular fracture, but in the ST direction the failure was preferentially due to cracking of carbides. The orientation of carbide bands in preferred direction and their excessive segregation affecting ductility in ST is discussed in this work.