Steel with heat treatment (for example AISI 4140 Q+T) has different tensile strength with different diameters of the material, and also different tensile strength in a same diameter according to distance to the center of the material, like Jominy test demonstrates (hardenability).
since the bar has different YTS along the diameter, which yield tensile strength should I use for the calculation of a shaft?
Moreover, why this image attached shows differents curves with different specimen diameters ?
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PabLo Dal Buoni
Steel with heat treatment (for example AISI 4140 Q+T) has different tensile strength with different diameters of the material, and also different tensile strength in a same diameter according to distance to the center of the material, like Jominy test demonstrates (hardenability).
since the bar has different YTS along the diameter, which yield tensile strength should I use for the calculation of a shaft?
Moreover, why this image attached shows differents curves with different specimen diameters ?
Thanks.
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