Friction Stir Lap Welding of Inconel 625 and a High Strength Steel
Elisangela Pelizzari Bossle,
Buchibabu Vicharapu,
Guilherme Vieira Braga Lemos,
Cleber Rodrigo de Lima Lessa,
Luciano Bergmann,
Jorge Fernandez dos Santos,
Thomas Gabriel Rosauro Clarke,
Amitava De
Affiliations
Elisangela Pelizzari Bossle
Laboratório de Metalurgia Física (LAMEF), Programa de Pós Graduacão em Engenharia de Minas, Metalúrgica e de Materiais (PPGE3M), Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre 91501-970, RS, Brazil
Buchibabu Vicharapu
Indian Institute of Technology Palakkad, Palakkad 678623, India
Guilherme Vieira Braga Lemos
Engenharia Mecânica, Campus Cachoeira do Sul, Universidade Federal de Santa Maria (UFSM), Cachoeira do Sul 96503-205, RS, Brazil
Cleber Rodrigo de Lima Lessa
Programa de Pós-Graduação em Tecnologia e Engenharia de Materiais (PPGTEM), Instituto Federal do Rio Grande do Sul (IFRS), Caxias do Sul 95043-700, RS, Brazil
Luciano Bergmann
Solid State Materials Processing (WMP), Institute of Materials Mechanics, Helmholtz-Zentrum Hereon, 21502 Geesthacht, Germany
Jorge Fernandez dos Santos
Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA
Thomas Gabriel Rosauro Clarke
Laboratório de Metalurgia Física (LAMEF), Programa de Pós Graduacão em Engenharia de Minas, Metalúrgica e de Materiais (PPGE3M), Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre 91501-970, RS, Brazil
Amitava De
Indian Institute of Technology, Mumbai 400076, India
The joining of dissimilar hard metals such as high-strength steel and nickel-based alloy is required for shipbuilding and offshore applications to enhance the strength, fracture toughness, and corrosion resistance of the exposed parts. However, the joining of these dissimilar alloys has remained a major challenge due to the limited solubility of Fe and Ni in each other, which commonly results in the formation of brittle intermetallic compounds. We present here a novel investigation on the joining of overlapped nickel-based alloy 625 and marine-grade GL E36 steel plates by friction stir lap welding (FSLW). The interface microstructure and its influence on joint strength are rigorously tested. The main bonding mechanism is found to be the mechanical mixing of Fe and Ni along the interface. The interface thermal cycles are computed by a three-dimensional numerical heat transfer model and their effects on the microstructure are examined. Multiple micro tensile specimens are extracted from the stir zone to examine the through-thickness variation in the stir zone properties. The welded joint is characterized further by evaluating the interface microhardness distribution, lap-shear strength, and surface residual stresses.
