Morphological and Structural Variations in Anodic Films grown on Polished and Electropolished Titanium Substrates

Palma, Dener Pedro da Silva; Nakazato, Roberto Zenhei; Codaro, Eduardo Norberto; Acciari, Heloísa Andréa

doi:10.1590/1980-5373-mr-2019-0362

Cited by 1 publication

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“…In all the above-mentioned applications, the joining plays a crucial role. Some applications demand better weld geometry with the narrow heat-affected zone, which is difficult to meet through conventional welding processes [ 22 , 23 , 24 , 25 , 26 ]. These requirements may be met using a highly focused and concentrated heat source, as in laser and electron beam welding processes.…”

Section: Introductionmentioning

confidence: 99%

Fiber Laser Welded Cobalt Super Alloy L605: Optimization of Weldability Characteristics

et al. 2022

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The present study describes the laser welding of Co-based superalloy L605 (52Co-20Cr-10Ni-15W) equivalent to Haynes-25 or Stellite-25. The influence of laser welding process input parameters such as laser beam power and welding speed on mechanical and metallurgical properties of weld joints were investigated. Epitaxial grain growth and dendritic structures were visible in the weld zone. The phase analysis results indicate the formation of hard phases like CrFeNi, CoC, FeNi, and CFe in the weld zone. These hard phases are responsible for the increase in microhardness up to 321 HV0.1 in the weld zone, which is very close to the microhardness of the parent material. From the tensile strength tests, the ductile failure of welded specimens was confirmed due to the presence of dimples, inter-granular cleavage, and micro voids in the fracture zone. The maximum tensile residual stress along the weld line is 450 MPa, whereas the maximum compressive residual stress across the weld line is 500 MPa. On successful application of Response Surface methodology (RSM), laser power of 1448.5 W and welding speed of 600 mm/min i.e., line energy or heat input equal to 144 J/mm, were found to be optimum values for getting sound weld joint properties. The EBSD analysis reveals the elongated grain growth in the weld pool and very narrow grain growth in the heat-affected zone.

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