Abstract
The influence of process parameters, axial force (AF) and preheat temperature (PHT) on thermo-mechanically affected zone (TMAZ) microstructure of Friction Hydro-Pillar Process (FHPP) welded joints of C-Mn steels are studied. Several samples were welded with four axial force levels, with and without application of preheating. Microstructure characterization was carried out using light optical (MO), scanning electron (SEM), and transmission electron microscopy (TEM) techniques, complemented with microhardness measurements. Microstructural evolution at the TMAZ was modeled using Calphad equilibrium calculations and calculated CCT diagrams. The results obtained shown that martensite and A-M constituent fraction in the TMAZ increase as AF increase. The use of preheating during process results in lower cooling rates and reduction of TMAZ microhardness. The TMAZ size decreases when the AF was increased.
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