Enhanced Machinability of P/M Parts Through Microstructure Control

Paper #:
  • 940357

Published:
  • 1994-03-01
Citation:
Fulmer, J. and Blanton, J., "Enhanced Machinability of P/M Parts Through Microstructure Control," SAE Technical Paper 940357, 1994, https://doi.org/10.4271/940357.
Pages:
8
Abstract:
As the geometric complexity and tolerance requirements of powder metal parts become more demanding added machining operations are required as a necessary step in the manufacturing process. Likewise, a better understanding of the effects powder metal materials and processes have on the machinability of P/M components is needed.An investigation into the effects of post-sintering cooling rate on the microstructure, machinability and tensile properties of an FC-0208 copper steel was conducted. Machinability was measured using a drill test on a high volume production component. Three cooling rates (9, 17 and 40 ° C/minute) were used to generate the variation in microstructure. Machinability analysis was performed using box-and-whisker plots and includes drill motor load, hole size on drill entry and exit, and microfinish. Metallography and tensile properties and a discussion of their relationship with machinability are included.Results indicate that the above mentioned cooling rates can produce a measurable difference in microstructure, machinability and tensile performance. A slow cooling rate can be employed to improve the machinability of this material. However, a substantial decrease in tensile properties results. Therefore, care must be taken to properly control the microstructure to optimize both machinability and mechanical properties for the application of interest.
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