Processing of quenched parts
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I currently have a batch of 40Cr forgings; the holes have a diameter of φ8, with a remaining allowance of 0.3 mm after rough machining. The heat treatment results in a hardness level of HRC48-55, and the current hardness tests confirm that it is within this range. However, during processing, the hardness appears uneven and the hole dimensions are unstable. What could be the cause of this? Is it due to insufficient annealing time? What should be the appropriate annealing temperature and duration?
You are referring to the forged billet; this is due to the fact that the heat treatment process did not heat the material evenly, and the tempering time was insufficient as well
The OP’s question is very professional. If this question is in the mechanical engineering section, there should be more replies. It’s suggested to turn around :)