Based on the phenomenon of material substitution in production practice,the heat treatment problems caused by improper control of substitution were discussed.Due to material change,the use of medium carbon alloy steel instead of low-carbon alloy steel for carburizatione,resulting in high hardness and poor toughness of the core matrix of the workpiece,leading to fracture during use.There had been a change in the supply status,but the heat treatment process had not been changed accordingly,resulting in the problems such as missing heat treatment processes and poor quality of heat treatment.There was a prob-lem of exceeding the maximum quenching diameter of the material due to size substitution,resulting in poor microstructure after heat treatment.In response to the above problems,develop a control process for material change,clarify the need to review changes,identify risks of changes and take targeted measures.And requirments were proposed to strengthen knowledge management,providing guidance for design mate-rial selection and process review through the collection of material related knowledge and the organization of experience and lessons learned.
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