Temat: micro-mechanical property

Skocz do pozycji: 1.

Tytuł:: Vlijanie temperatury oksidirovanija na mikromekhanicheskije i tribologicheskie svojjstva splava sistemy Nb-Ti-Al
Effect of the oxidation temperature on the micro-mechanical and tribological properties of Nb-Ti-Al alloy
Autorzy:: Vasyliv, C.
Vynar, V.
Ratska, N.
Panasyuk, P.
Tematy:: oxidation
temperature
niobium-titanium-aluminium alloy
tribological property
micro-mechanical property
internal stress
mechanical characteristics
deformation; Pokaż więcej
Wydawca:: Komisja Motoryzacji i Energetyki Rolnictwa
Powiązania:: https://bibliotekanauki.pl/articles/77713.pdf Link otwiera się w nowym oknie
Opis:: The effect of temperature oxidation on micromechanical properties and the tribological behavior of the alloy Nb-Ti-Al has been investigated. The increasing of annealing temperature from 300 to 900 C leads to increasing of the internal stresses and microhardness in the micro/nanoscale of crystal lattice and reducing of the plasticity. The tribological properties of alloy after oxidation at temperature 500C are optimal. At this temperature dispersion strengthening of alloy creates a minimum internal pressure and provides good plasticity of surface.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Improvement of Strength and Oxidation Resistance at High Temperature in AISI 4140 Steel by Micro-Alloying Chromium and Tungsten for Automotive Engine Applications
Autorzy:: Kim, Hyo-Seong
Kang, Moonseok
Park, Minha
Kim, Byung Jun
Kim, Byoungkoo
Ahn, Yong-Sik
Tematy:: AISI 4140
micro-alloying
microstructure
mechanical property
heat-treatment; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/59110911.pdf Link otwiera się w nowym oknie
Opis:: Increasing the operating temperature and pressure of an automotive engine and reducing its weight can improve fuel efficiency and lower carbon dioxide emissions. These can be achieved by changing the engine piston material from conventional aluminum alloy to high-strength heat- resistant steel. American Iron and Steel Institute 4140 modified steels (AISI 4140 Mod.s), which have improved strength, oxidation resistance, and wear resistance at high temperature were developed by adjusting the AISI 4140 alloy compositions and optimizing the heat treatment process for automotive engine applications. In this study, the effects of modifying alloy compositions on the microstructure, mechanical properties (both at room and high temperatures), and oxidation of AISI 4140 Mod.s were investigated. Effective grain refinement occurred due to the influence of high-temperature stable carbide forming elements such as Mo, and V. The bainite structure changed to martensite structure under the influence Cr and Ni. As the Cr and W contents increased, the oxidation resistance was improved, and the oxide layer thickness decreased after 10 hours exposure at 500°C. The AISI 4140 Mod. exhibited a 35% improvement in room temperature strength, 70% improvement in high-temperature strength, and 40% improvement in high-temperature oxidation resistance compared to conventional AISI 4140.
Dostawca treści:: Biblioteka Nauki

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