DEVELOPMENT OF IMPROVED CUTTING TOOL MATERIALS.
Abstract
New tool materials were developed to achieve increased cutting efficiency. High-speed steels of the M2 type were enriched in titanium, hot worked, then solid-state carburized. These tools showed a permissible cutting speed increase of about 35% compared to commercial 'RC 70' type high-speed steel when used for turning AISI 4340, RC 44. Similar increases in cutting performance were measured for cast-to-shape tools based on M1 high-speed steel containing 10% V, up to 2% Ti and 3.5 % C. Age-hardenable cobalt-base tool alloys were prepared by the hot working of atomized powders. The most promising alloy was Co-45Cr-15W-2.5C, which exhibited a permissible cutting speed increase of 120% over the commercial cast cobalt-base tool alloy in turning the RC 44 steel; a speed increase of 35% was achieved in turning AISI 4340 at RC 52. Cemented carbide tool alloys having matrix melting points near 1800 C (3270 deg F) were prepared by liquid-phase sintering or arc-melting Compositions in the Cb-V-C and Ti-V-C systems were the most promising. Initial studies of arc-melted 80Hf-20Ta, nitrided at 1930 C (3500 F), showed a cutting speed capability similar to that of commercial alumina tools on AISI 4340, RC 44.5. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1967
- Accession Number
- AD0818562
Entities
People
- F. C. Holtz
- H. Morrow
- H. Nudelman
- R. L. Hodson
- T. Watmough
Organizations
- IIT Research Institute