HARDENED HEAT TREATMENT CONTROL
THE MAIN HEAT TREATMENTS
Quenching and tempering
site. The aim is to use the Iron-Carbon diagram (figure 1) to place it in the austenitic range. This diagram is used to deter- mine the temperature of a treatment to make phase transformations. This heating operation is followed by rapid cooling with water, oil or gas. The CCT diagram (continuous cooling trans- formation), determines the cooling conditions that will transform austenite into
Martensite. This type of diagram is specific to each steel grade.
Fig. 1: Fe-C diagram
Fig. 2: Quenching and tempering curve
Fig. 3: Static quenching
Fig. 4 Flow quenching
Applications : arbre, engrenages, axe, broche….
The carbon-rich atmosphere (from CH4, propane or butane type gas) enriches the surface layer.
This thermochemical treatment is followed by rapid cooling, which hardens the enriched layer.
The Case Hardness Depth (CHD) is determined by the vertical distance from the surface to the layer at a hardness limit of 550 HV. Case Hardness Depth generally varies between 0.5mm and 3mm.
Applications are mainly mechanical parts such as gears, transmission shafts, etc.
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