Abstract
The using of nanotechnology in the welding process has great importance in developing the mechanical properties of welding joints for metals. This paper investigated the effect of addition TiO2 NPs to welding joints to improving the Impact toughness property of the welding joints. The cold spray coating method of the nanoparticles are used to adding the TiO2 NPs to the welding joints during the welding process. Three weight fraction are used for TiO2 NPs (0.75%, 1.5%, and 2%). The testing samples were prepared for Impact test, and microstructure by SEM. The results show the increasing in Impact toughness of welded joints with an increase of TiO2 NPs concentrations. The average Impact toughness for the welded sample without TiO2 NPs. was (162.4 J), while the average Impact toughness for the welded sample with (1.5)% TiO2 NPs. was (231.2 J) with improving rate of (42.36%). The Microstructure images by SEM show the adding of TiO2 NPs decreases the grain size and homogenous region in welded joints cross-section compared with a sample without adding TiO2 NPs. The EDS analysis show that increase Ti contain and decrease (Mn and Si) contain with increase TiO2 NPs.
Highlights
Titanium dioxide (TiO2) NPs were used to create a new types of metal matrix composite materials (MMCM) in many engineering applications
That increasing the ratio of TiO2 nanoparticles in welding joints lead to increasing Impact toughness because of increasing the intragranular acicular ferrite
Note that increasing the ratio of TiO2 nanoparticles in welding joints above 1.5% resulted a decrease in impact toughness
Summary
Titanium dioxide (TiO2) NPs were used to create a new types of metal matrix composite materials (MMCM) in many engineering applications. Fattahi et al studied improving the mechanical properties of welding zone by the addition of TiO2 NPs to the electrode coating and investigated the effect of nucleation of intragranular ferrite.
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