Impact of rolling conditions on the hydriding of grade 2 titanium welded tubes

^a NEOTISS, ZI, rue Marthe Paris, BP 30, 21150 Venarey-Lès-Laumes, France
^b Université de Bourgogne, Laboratoire ICB, UMR 6303 CNRS/UBFC, 9 Av. Alain Savary, BP 47870, 21078 Dijon, France
^c Université de Lorraine, Laboratoire LEM3, UMR CNRS 7239, 7 rue Félix Savart, BP 57073 Metz, France

Abstract

In this article, we study the impact of rolling conditions on the texture of the commercially pure titanium grade 2. In a previous work, NEOTISS in collaboration with ICB laboratory, shown that the texture highly influences the precipitation of hydrides in Titanium. In order to create different textures, Titanium sheets grade 2 are cold rolled asymmetrically and symmetrically with or without lubricant. The inverse pole figures and direct pole figures obtained allow us to deduce that symmetrical cold rolling does not change the grains orientation but generates a rotation of grains along c-axis (normal to basal plan). However, asymmetrical cold rolling leads to the formation of a new crystallographic texture, which could limit the formation of the hydrides in titanium grade 2 submitted to a hydrogen-rich environment.

Key words: asymmetrical rolling, symmetrical rolling, titanium, hydriding, texture