A portion of the Fe-C equilibrium phase diagram is shown below. A steel containing 0.76wt% C is held at 900° in the single phase, Austenite region. Describe the change in structure that occurs as this alloy is cooled to a temperature of 700°C. 1100 1000 Y. 900 y+ Fe,C 800 a+y 727°C 700 0.76 2.14 0.022 600 500: a+ Fe,C 400 0. 1.0 2.0 Composition (wt % C) Temperature ("C)

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Design of Shafts and Shaft Components

The shaft is basically defined as the machine element that rotates, is in circular cross-section, it is majorly used to transfer the power from one part of the system to another, or from a power generating machine to a power absorbing machine. The shaft is supported on bearings and is rotated with the help of a set of gears or pulleys that are used for the power transmission. Bending moment, torsion, and an axial force act upon the shaft. Designing of shaft primarily involves determining stresses at a critical point in the shaft that is arising due to loading.