![]() Abrasive wear was the main wear mode for the weld metals by using multi-principal filler materials. The wear loss of the CoZnCuMn 0.8 Si 0.2 and FeCoCrNiMn samples was 4.5% and 11.4% of that of the Al 6061 alloy, respectively. Moreover, the weld metals by using multi-principal filler materials had a better wear resistance compared to that of the AlSi12 sample. Compared to the AlSi12 sample, the FeCoCrNiMn sample had excellent corrosion resistance in NaCl solution, whereas the CoZnCuMn 0.8 Si 0.2 sample had excellent corrosion resistance in HCl solution. The thermodynamic environment with a low Δ G mix was formed in the weld metals. It was found that the weld metals by using multi-principal filler materials presented the contents of chemical elements in the range of 5–35 at%. The effects of multi-principal filler materials on the corrosion behavior and wear resistance of the weld metals were evaluated. Three types of filler materials including CoZnCuMn 0.8 Si 0.2, FeCoCrNiMn, and AlSi12 powders were used. In this study, the joining of Al 6061 alloy to 304 stainless steel served as the research object. However, few studies have concentrated on the corrosion and wear resistance of the Al/steel dissimilar weld metals by using multi-principal filler materials. Multi-principal filler materials via a high-entropy design have been reported to successfully finish the dissimilar metal joining of Al alloy to steel and to reduce the amount of Fe-Al IMCs in weld metals. Compared to linear motion wear machines operating with constant speed and a constant load effect, the manufactured wear machine can better explain the wear mechanism between contact materials as a “constant load-variable load effect”. The wear machine was able to operate successfully for a maximum of 30 N loads and up to 30 min in the wear tests. The operation of the design system is explained by the calculation of the reaction force and strength under different loads, depending on certain settings. In the system, the movement is repeated periodically twice in each cycle. In the wear machine, the abrasive, attached to a plate that can move linearly back and forth, is in contact with the surface of a material to be tested in a fixed position. The creation of the solid design model and the finite element analysis were performed in the SolidWorks program. The reliability of this method was verified, and it provides convenience for the calibration of the residual stress of stainless steel materials.Ī variable load effective wear machine was designed, analyzed using the finite element method, and manufactured after its strength was verified. A portable residual stress loading device was developed and combined with the indentation test to calibrate the 316 L and 304 stainless steel of nuclear welding joint material. Based on the relationship among strain increment, residual stress and material mechanical properties, the calibration equation of residual stress for different materials were established. Meanwhile, the presence of residual stress in material will cause the strain increment in the strain measurement area near the indentation to change. Through numerical simulation, the effect of the material properties and residual stress on the plastic zone around the indentation was investigated, and the ideal strain measurement region appropriate for diverse materials was identified. The optimal B-pillar with tailored properties has an advantage over the base B-pillar, which could be used for B-pillar design.Ī spherical indentation strain method was proposed to determine surface residual stress in this study. Single and multi-objective optimization studies were conducted to maximize peak crushing force and specific energy absorption for the upper part T400 and lower part T25 heat-treated B-pillar. Since the energy absorption value of the upper part T25 and lower part T400 heat-treated B-pillar is low, the upper part T400 and lower part T25 heat-treated B-pillar provides the second-highest peak crushing force was chosen for use in the optimization. Upper part T400 and lower part T25 heat-treated B-pillar gave the highest energy absorption value. The highest peak crushing force was obtained from the upper part T25 and lower part T400 heat-treated B-pillar. For this purpose, roof crushing analyses were conducted, and results were compared in energy absorption and peak crushing force. Simulations were also performed for designs where different parts of the B-pillar have different hardness values (tailored properties). B-pillars designed from B1500HS boron steel were compared for roof crushing situations for three different hardness values in the study’s scope. ![]()
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