A new approach for dry metal forming: CO2 as volatile lubrication in combination with hard and low friction coatingsGeorg Umlauf, Henning Hasselbruch, Jan Hinnerk Henze, Jakob Barz and Andreas MehnerMATEC Web Conf., 190 (2018) 14012DOI: https://doi.org/10.1051/matecconf/201819014012