D propagation path in the box beam-V and box-beam-H, respectively. The
D propagation path from the box beam-V and box-beam-H, respectively. The crack occurred inside the HAZ and propagated in addition to the weld bead. four. Conclusions Within this study, with medium-strength welded structural steel (SM355A, KS D 3515 equivalent to S355JR, EN 10025-2) extensively utilised in sector, PWHT effects on GYKI 52466 supplier material properties for instance hardness, microstructure, and mechanical properties of weld specimens and full-size beams had been studied. Various results are as follows. (1) When the base metal, HAZ, and weld metal were annealed at 590 C and 800 C for 1 h, the yield and tensile strength decreased however the elongation enhanced. When annealed at 800 C for 1 h, the tensile curves from the base metal, HAZ, and weld metal showed just about similar behavior. That explained the just about constant hardness values and homogenization in the components. For specimens not heat-treated, the parent material’s yield strength, the yield strength in HAZ, as well as the yield strength with the weld metal had been 350 MPa, 345 MPa, and 340 MPa. For specimens heat-treated at 590 C, they have been 350 MPa, 345 MPa, and 340 MPa. For specimens heat-treated at 800 C, they had been 350 MPa, 345 MPa, and 340 MPa. In the base material, PWHT at 800 C slightly enhanced the Charpy effect absorption energy. But PWHT at 590 C slightly lowered the effect resistance. The shock absorption energy on the weld metal was drastically decrease than that of the base metal. And it did not enhance considerably by heat treatment. For specimens not heat-treated, the Charpy impact absorption energies at 20 C with the parent material and weld metal have been 291.5 J and 187 J. For specimens heat-treated at 590 C, they had been 276 J and 166 J. For specimens heat-treated at 800 C, the Charpy impact absorption power at 20 C with the parent material was 299 J. PWHT had a slight impact around the fatigue strength with the base metal and slightly enhanced the fatigue strength on the butt-welded specimen. Inside the case of a specimen ground in the toe portion and not heat-treated, the compressive residual pressure occurred close to the surface, along with the fatigue strength slightly enhanced. Even so, when heat treated, the beneficial impact from the compressive residual tension disappeared, plus the neighborhood damage triggered by grinding lowered the fatigue strength. The fatigue limit with the full-scale beam annealed at 590 C was ten.8 decrease than that with the as-welded beam. These final results show the possibility of fabricating a bogie frame that doesn’t require PWHT. Vertical and horizontal gussets welded to as-welded beams decreased the fatigue limits by 30.9 and 56 , respectively.(2)(3)(4)Metals 2021, 11,18 ofFunding: This study was funded by Korea Railroad Research Institute. Institutional Assessment Board Statement: Not applicable. Informed Consent Statement: Not applicable. Information Availability Statement: Not applicable. Conflicts of Interest: The FM4-64 Purity & Documentation author declares no conflict of interest.
metalsArticleThermophysical Properties of Electric Arc Plasma and the Wire Melting Impact with Lanthanum and Sulfur Fluorides Addition in Wire Arc Additive ManufacturingSergey G. Parshin 1, and Peter MayrInstitute of Mechanical Engineering, Components and Transport, Peter the Wonderful St. Petersburg Polytechnic University, Polytechnicheskaya 29, 195251 St. Petersburg, Russia Chair of Materials Engineering of Additive Manufacturing, Technical University of Munich, Boltzmann str. 15, 85748 M chen, Germany; [email protected] Correspondence: [email protected]; Tel.: +7-812-552-63-Citation: Pa.