To what factors would you attribute the fact that the coefficient of friction in hot working is

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To what factors would you attribute the fact that the...

Key Concepts

Adhesive Wear

Adhesive wear involves the formation of strong bonds between contacting surfaces, which is more likely to occur under high temperature conditions. The increased adhesion during hot working can lead to material transfer and micro-welds, which make the sliding process more resistant and elevate the coefficient of friction.

Coefficient of Friction

This concept refers to the ratio of the force of friction between two bodies in contact to the force pressing them together. It is a key parameter in understanding how different working conditions—such as temperature changes in processing—impact the mechanical interaction at the tool-workpiece interface.

Temperature Effects on Material Behavior

High temperatures during hot working can significantly alter the properties of the materials involved. Elevated temperatures tend to soften the workpiece material, change its flow characteristics, and influence the nature of contact with the tooling, thereby affecting the frictional behavior during deformation.

Oxide Scale Formation

At elevated temperatures, the workpiece surface often oxidizes, forming an oxide scale that can modify the contact surface roughness and adhesion properties. This scale may act as an abrasive or adhesive layer, increasing resistance to sliding and contributing to a higher coefficient of friction in hot working compared to cold working.

Lubrication Degradation

In hot working conditions, lubricants may break down or become less effective due to thermal degradation. As the temperature increases, the chemical stability and viscosity of lubricants can diminish, reducing their ability to form a protective film between contacting surfaces and thereby increasing friction.

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