An experimental study of interfacial friction-hot ring compression

Article Abstract:

An analysis of the influence of the rate of strain and temperature on frictional shear in metal forming is given. Ring compression tests were done using an automated servohydraulic testing system with an Instron Model 1332 at temperature ranges of 900 to 975 degrees Centigrade. Strain rates of 10/s could be obtained with the system. Results show that the ring test method is an effective method in discovering the properties of friction in metal forming. The rate of strain, temperature, material and scale formation affect the value of the frictional shear.

Shear (Mechanics), Friction, Compressibility

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The distribution of temperatures in a hot/cold die set: the effect of the pressure, temperature, and material

Article Abstract:

The temperature distribution in three sets of dies was studied during controlled compression tests to determine the influence of pressure and temperature on the transfer of heat at the contacting surfaces. Two experimental methods for measuring the temperature of the surfaces were also evaluated. Results show that both the temperature and pressure have considerable effect on the heat transfer properties of the contacting surfaces.

Mass transfer, Dies (Metalworking)

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Phase transformation temperatures of an ultra-low carbon steel

Article Abstract:

The study of an ultra-low carbon steel determines the temperatures at which an austenite to ferrite transformation occurs. Temperature-time curves were analyzed during cooling, and the effects of variables including austenite grain size, deformation pattern and deformation conditions, were investigated. Transformation temperatures rose when the initial grain size became smaller or when cooling rates decreased.

Observations, Carbon steel, Heat treating (Metalworking), Ferrites (Magnetic materials)

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