Hardening depth
The hardening depth is the depth in a workpiece up to which a specified minimum hardness is achieved. It depends on hardening methods such as martensite formation or austenite transformation.
Physical-Chemical Mechanism of Action
Hardening depth refers to the depth in a workpiece to which a certain hardness is achieved. This process can be caused by various hardening methods such as martensite formation or austenite transformation. In martensite formation, the material cools rapidly, forming glass-hard structures, while austenite transformation during slow cooling produces a softer phase.
Metallurgical Relevance & Welding Risks
Hardening depth is of great importance for the mechanical properties of the workpiece. Too little hardening depth can lead to overly soft areas that may crack under hardness use or load. On the other hand, excessive hardening can lead to glass-hard areas with increased brittleness. It is important to control the hardening depth precisely to ensure the desired material behavior.
Shop Practice & Instructions
To determine and control hardening depth, the hardening methods and cooling times must be precisely followed. For martensite formation, it is important to cool the material quickly, e.g., with water spray or liquid cooling systems. For austenite transformation, cooling should be slow to achieve a soft phase. The exact hardening depth can be determined by hardness testing, e.g., Brinell or Rockwell hardness tests.