Effective case depth
Hardness depth to DIN is the distance from the surface of a case-hardened component to the point where a defined limit hardness is no longer met. It indicates the extent of the altered zone.
Physical-Chemical Mechanism of Action
Hardness depth to DIN refers to the region in a material that has been altered by a hardening process like case hardening (RSG). In this method, the surface is hardened while the core remains softer. This is done by applying heat and then cooling under a protective shield.
Metallurgical Relevance & Welding Risks
Too little hardness depth can mean the part's surface isn't hard enough, making it susceptible to wear or cracking. Too much hardness depth can make the surface too hard, leading to brittleness and fracture. Also, uneven hardness depth can create stress variations that may cause cracks.
Workshop Practice & Action Items
To ensure hardness depth to DIN, follow these steps:
1. Material Preparation: Make sure the material is clean and free of contaminants.
2. Apply Hardening Treatment: Use the case hardening (RSG) method with the specified temperatures and times.
3. Cool Under Protective Shield: Cool the material under a shield to ensure uniform hardness.
4. Measure Hardness Depth: Use a hardness tester to measure the hardness depth and verify it meets the required standard.