Review on the influence of process parameters in incremental sheet forming

Incremental sheet forming (ISF) is a relatively new flexible forming process. ISF has excellent adaptability to conventional milling machines and requires minimum use of complex tooling, dies and forming press, which makes the process cost-effective and easy to automate for various applications. In the past two decades, extensive research on ISF has resulted in significant advances being made in fundamental understanding and development of new processing and tooling solutions. However, ISF has yet to be fully implemented to mainstream high-value manufacturing industries due to a number of technical challenges, all of which are directly related to ISF process parameters. This paper aims to provide a detailed review of the current state-of-the-art of ISF processes in terms of its technological capabilities and specific limitations with discussions on the ISF process parameters and their effects on ISF processes. Particular attention is given to the ISF process parameters on the formability, deformation and failure mechanics, springback and accuracy and surface roughness. This leads to a number of recommendations that are considered essential for future research effort

Different Effects of Ni and Mn on Thermodynamic and Mechanical Stabilities in Cr-Ni-Mn Austenitic Steels

Thermodynamic and mechanical stabilities of austenite were investigated in Cr-Ni-Mn austenitic steels by varying the contents of Ni and Mn. Mn was more beneficial to increasing thermodynamic stability against martensitic transformation than the equivalent amount of Ni. However, the tendency for strain-induced martensite transformation was governed not by the thermodynamic stability but by stacking fault energy (SFE) which was increased more effectively by Ni than by the equivalent amount of Mn. A modified SFE equation and experimentally determined Ni equivalents may suggest a criterion for austenite stability throughout tensile deformation.11Nsciescopu