Enhanced Machinability of P/M Parts Through Microstructure Control Burgess-Norton Manufacturing Company

Format:

Conference/Event

Author/Creator:

Fulmer, John J., author.

Conference Name:

International Congress & Exposition (1994-02-28 : Detroit, Michigan, United States)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 1994

Summary:

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

Notes:

Vendor supplied data

Publisher Number:

940357

Access Restriction:

Restricted for use by site license