Production, structure, and properties of engine pistons made from transeutectic deformable silumin

Microstructure and Mechanical Properties of Al-Si Alloys Produced by Rapid Solidification and Hot Extrusion

“…When designing alloys with a higher content of silicon, e.g., materials intended for heavily loaded combustion engine pistons, special attention should be paid to the problems associated with the lack of a sufficiently effective method of modifying the morphology and size of primary silicon crystals in alloys with hypereutectic composition [35][36][37]. Examples of the effects of increased temperature on the mechanical properties of rapidly solidified AlSi alloys are shown in Figure 10.…”

“…Strong fragmentation of silicon particles and grains resulted in increased strength properties. As shown in Figure 7, in the samples after the rapid solidi- When designing alloys with a higher content of silicon, e.g., materials intended for heavily loaded combustion engine pistons, special attention should be paid to the problems associated with the lack of a sufficiently effective method of modifying the morphology and size of primary silicon crystals in alloys with hypereutectic composition [35][36][37]. Long, acicular silicon crystals have a very adverse effect on the mechanical properties, can contribute to numerous cracks, and sometimes completely degrade the mechanical workability.…”

Influence of Thermal Cyclic Deformation and Hardening Heat Treatment on the Structure and Properties of Steel 10

“…The number of thermal cycles, the ranges of temperature, holding at extreme temperatures, heating and cooling rates of parts and pieces as well as the parameters of the deformation process such as form, temperature, the deformation ratio in the cycle and its total value can be used as the process control parameters to obtain fundamentally different structures, and, therefore, different material properties, while applying such treatments. Deformation thermal-cycling treatment can not only improve a number of physical and mechanical characteristics of metals and alloys, but obtain a deformed semi-finished products made of hypereutectic silumins with low plasticity through the use of thermal cycling deformation combined with annealing [7][8][9][10]. The development of heat treatment modes followed by DTCT modes is peculiar for each particular steel, cast iron, aluminum alloy grade and cannot be mechanically transfered from one material to another.…”

Estudos dos mecanismos envolvidos em processos de endurecimento superficial a laser de ligas a base de alumínio

“…As ligas de Al-Si são amplamente utilizadas na indústria em substituição ao aço e o ferro fundido nos setores de alta tecnologia, como a indústria automobilística, aplicações em estruturas aeroespaciais e militares [28] .…”

“…Com o objetivo de melhorar suas propriedades é necessário modificar sua composição adicionando elementos de liga, tais como Cu, Ni e Mg [29,30] . tempo, procura-se manter ou melhorar as propriedades mecânicas [23,28,[31][32][33][34][35][36] . No entanto, a dureza superficial e a resistência ao desgaste do alumínio e suas ligas são relativamente baixos, limitando sua aplicação [22] .…”