Mise au point de surfaces résistant à des sollicitations de roulement glissement sous des pressions de contact élevées de 2,5GPa et jusqu'à 300°C : applications aux engrenages et aux transmissions par courroies

Abstract : Car designers are seeking ways to improve the performance of power transmission mechanical parts which subjected to severe conditions. Attention should be drawn in particular to contact pressure and operating temperature. Our object was to seek a dual material surface treatment resistant to contact fatigue phenomena under pressures of 2.5GPa up to 300°C. Thermochemical treatments by carbon and nitrogen diffusion and hardening mechanisms associated with these treatments improve the surface properties of steels. Three approaches are considered in order to reach the objectives : 1) Hardening by chromium nitrides precipitation during nitriding (at 520°C) of chromium alloyed 32CrMoV13 industrial steel. It is a satisfactory solution to achieve the objectives; however, it requires a long thermochemical treatment; 2) Hardening by martensite transformation after carbo-nitriding with a high nitrogen concentration allowing nitrides precipitation during tempering at 300°C of slightly alloyed 27MnCr5 and 27CrMo4 steels. This type of treatment does not reach the objectives: carbo-nitriding layers evolve quickly with temperature increasing until 300°C; 3) Hardening by martensite transformation after carburizing of silicon alloyed 15NiMoCr10 steel. Silicon slows down martensite decomposition before 300°C. Results of microindentation at 300°C show that elastic characteristics of carburizing and tempered 15NiMoCr10 steel layer are reduced. The remaining values do not guarantee a sufficient endurance of steel carburised surface up to 300°C without it first being subjected to mechanical tests in real operating conditions. This steel and thermochemical treatment associated have however potential characteristics which justify these tests
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Natalia Loukachenko. Mise au point de surfaces résistant à des sollicitations de roulement glissement sous des pressions de contact élevées de 2,5GPa et jusqu'à 300°C : applications aux engrenages et aux transmissions par courroies. Autre. Institut National Polytechnique de Lorraine, 2006. Français. ⟨NNT : 2006INPL088N⟩. ⟨tel-01752556⟩

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