High through-put nanoindentation mapping and indentation creep behavior of P-TIG welded CpTi and Inconel 718 using a Nb-interlayer. (December 2022)

• Record Type: Journal Article
• Authors: Shehbaz, Tauheed; Khan, Fahd Nawaz; Junaid, Massab; Aresh, Balaji
• Is Part Of: Materials today communications. Volume 33(2022)
• Publication Date: 2022-12
• Subjects: Mechanical properties mapping -- Indentation -- Hardness -- Welding -- Creep; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2022.104994
• Languages: English
• ISSNs: 2352-4928

Abstract

Abstract: The high-speed correlative study of the local mechanical properties and indentation creep of different zones of the P-TIG welded CpTi (Commercially pure Ti) and IN718, with Nb as an interlayer has been studied. The results showed contrasting mechanical properties (nanohardness and elastic moduli) to a width of 35 µm and 60 µm at the Nb/CpTi and the Nb/IN718 interfaces with hardness of ∼9 GPa and ∼15 Gpa, respectively. This was owing to the strengthening of the interfaces due to the interdiffusion of Nb into the base alloys. The Nb/IN718 and Nb/CpTi interfaces, exhibited significantly higher resistance to creep deformation than the Nb-Interlayer. The stress exponent at the Nb/CpTi interface and in different zones of Nb/IN718 side indicated dislocation climb as the creep deformation mechanism. Graphical Abstract: ga1 Highlights: Nanomechanical properties mapping of TIG welded CpTi/Nb/Inconel718 joint was carried out. Nanohardness varied along the interfaces, due to the interdiffusion of Nb in base alloys and the formation of IMCs. Based on the stress exponent (n), creep deformation mechanism was determined in various zones of the weldment.