Impact of short-time annealing on AISI 8670 tool steel saw during industrial brazing process

Abstract

This study is focused on determining the impact of short-time annealing during industrial brazing process. Short-time annealing is commonly used to alleviate residual stresses resulting from the brazing process and represent in this study 30% of the process time. Samples were selected using two designs of experiments with three main parameters which are temperature of brazing, temperature of short-time annealing and time of first cooling for the first, and temperature of brazing for the second. Shear resistance tests allowed to refine the selection of samples for further investigation. EDS views, hardness measurements and residual stress measurements were conducted. From the obtained results, although slight differences were observed in the microstructure, hardness, and residual stresses of the samples, no clear pattern of impacts could be attributed to short-time annealing. In conclusion, this study did not find substantial evidence of short-time annealing having a significant impact on the microstructure, hardness, or residual stresses in the context of industrial brazing for wood cutting tools. Further research could explore other annealing parameters or alternative heat treatment methods to achieve the desired material properties.

Keywords

• Metallurgical engineering
• Saw
• Tool steel
• Brazing
• Microscopic characterisation and microanalysis
• Residual stress