Why Do Fractured Steel Specimens Feel Warmer After Tension?

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Discussion Overview

The discussion centers around the phenomenon of steel specimens feeling warmer after being fractured under tensile stress. Participants explore the underlying mechanisms of energy absorption, deformation, and the effects of internal friction during the loading process.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the reasons behind the temperature increase in fractured steel, prompting exploration of the deformation process prior to failure.
  • Another participant suggests that the energy absorbed during plastic deformation is dissipated as heat and new surface energy upon fracture, noting that materials with less plastic deformation, like brittle cast iron, do not exhibit the same temperature increase.
  • A separate post introduces a practical issue related to forging die steel, mentioning the formation of cracks during the forging process and questioning potential causes, including the quality of the ingot and the forging technique.

Areas of Agreement / Disagreement

Participants express differing views on the mechanisms behind the temperature increase in fractured steel, and the discussion remains unresolved regarding the specific causes of cracking in the forging process.

Contextual Notes

Participants have not reached consensus on the exact relationship between plastic deformation and temperature increase, nor on the factors contributing to cracking during forging. There are also assumptions regarding the properties of different steel types and their behavior under stress that remain unaddressed.

TheClincher
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A question has been puzzling me: why does a steel specimen feel warmer after it is fractured via applied tensile stress?
 
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Think about the deformation of the metal before failure. What is happening during the loading of the steel? What is the significance of the uniform elongation, total elongation and fracture surface?

The other factor is the internal friction in the metal.
 
When a metal is plastically deformed it absorbs energy. (the area inder the stress strain curve is a measure of this). This energy is dissipated as heat and as new surface energy when the metal breaks. A brittle cast iron (that is little plastic deformation) will not get as warm

Stay Hep
Greg
 
well i have to forge die steel from a steel ingot(casted). After heating it to the correct temperature the piece is brought under the hammer and the forging process begins.
in the first 10 strokes of the hammer cracks form on the surface and sometimes the piece breaks into 2 or more parts.What am i doing wrong.?
I know the first thing that comes to mind is that there is a fault in the ingot but that's not it because some come out fine , some have minor cracks on them that can be grinded( IN the same heat of the induction furnace.).
HElP.!
 

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