|Broad Area of Technology:||Materials Science and Engineering, Composite Materials|
|Narrow Field:||Thermal and Thermochemical Treatment, Hardening of Tools|
|Purpose:||The process permits increasing the performance, service characteristics and life of tools made of high-speed steels|
Brief Description and Specific Features
The process implies the usage of conventional equipment for heat treatment and does not require additional hardware. A new regime of hardening and tempering (temperature, duration, the sequence of operations and the chemical composition of a heating medium constitute the "know-how") permits modifying the structure of a high-speed steel to produce actually a composite material. It is composed of a hardened surface layer of a desired thickness with a high content of coarse and fine carbide particles and a ductile core having uniform fine-grained structure characteristic of a high-quality high-speed steel. As compared with standard heat treatment regimes, the process offers an increase in impact strength by the factor of 1.5 - 2.5 and improves tensile strength by 10 - 20%. The surface hardness is by HRC 1 - 6 higher and the core hardness is by HRC 1 - 3 lower than those obtained after conventional heat treatment, which contributes to the improvement of service characteristics.
.the tools being HRC 66 - 67 u the tools processed by this technology permit improving the surface finish of milled parts by 1 - 2 degree.
Results of Testing in Industry
The use of the developed heat treatment process and its combination with carbidizing treatment permits increasing the service life of cutting tools by the factor of 1.5-3, the maximal achieved surface hardness being HRC 67 - 68. The cost of the operation increases by only 5 - 15% in comparison with standard heat treatment.
|Mills||2 - 3|
|Drills, broaches, reamers||1.5 - 2.5|
|Screw taps, cutters||1.5 - 2|
For more information please contact the author:
Belarussia State Polytechnic Academy
65 F.Skorina Ave., built. 7
Phone: (375) 17 2581066 (home), 2399260 (office)
Fax: (275) 17 2329137
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