Stress generation during the quenching of large AA2618 forgings: Finite element computations and validation against neutron diffraction measurements

摘要

Solutionising and quenching are key steps in the fabrication of heat treatable aluminium parts such as AA2618 compressor impellers for turbochargers. Quenching not only dictates the mechanical characteristics of the product but also induces residual stresses that can cause unacceptable distortions during machining and unfavourable stresses in service. Predicting and controlling stress generation during quenching of large AA2618 forgings is therefore of great interest. Since possible precipitation during quenching may affect the local yield strength of the material and thus impact the level of macro-scale residual stresses, consideration of this phenomenon is required.