Investigation of Material Properties of Cardan Shaft Fixed Joint Forked Flange Produced by Hot Forging and Cooling in Different Enviroments
Osman Çulha Fulya Eyçin Serhat Bardakçı
AbstractChemical composition and steel alloy structure are the most important process inputs affecting the material properties in production with hot forging. Different mechanical properties can be obtained in the product due to the cooling regime applied at the end of the forging operation. Especially, as a result of the cooling process, the alloy phase structure is transformed into different phases at room temperature. The microstructure of micro alloyed steels at room temperature, which is obtained by thermomechanical forging at high temperatures, differs from one another depending on cooling atmosphere. According to the literature review; microstructure of forged material shows that the finer grain structure has higher toughness and fatigue strength. In this study, 1.1141 coded cardan shaft fixed forked flange produced by hot forging at 1200 oC and 5 different operations, used as sample. Microstructural; grain size, type, distribution and rate of phase and mechanical properties; hardness and strength variations of hot forged samples under four different cooling media such as; controlled, air, oil and water cooling, were investigated in simulation. Phase transformation and distribution were calculated according to the cooling rate and TTT-CCT diagram of sample.