Methods of thermo-mechanically processing tool steel and tools made from thermo-mechanically processed tool steels

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United States of America Patent

PATENT NO 8968495
APP PUB NO 20090229417A1
SERIAL NO

12370906

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Abstract

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A method of thermo-mechanically processing a preform composed of tool steel and a tool to modify a workpiece. The preform has a region containing austenite. The method comprises establishing the region at a process temperature between a martensitic start temperature and a stable austenitic temperature. While at the process temperature, the region is deformed to change an outer dimension and to modify the microstructure to a depth of 1 millimeter or more. The tool comprises a member composed of tool steel. The member includes a first region that extends from the outer surface to a depth of greater than 1 millimeter and a second region. The first region includes a plurality of grains having an average misorientation angle greater than about 34°, an average grain size that is at least 10% smaller than the second region, and has a different grain orientation than the second region.

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Patent Owner(s)

Patent OwnerAddress
WELLS FARGO BANK NATIONAL ASSOCIATION AS ADMINISTRATIVE AGENT1800 CENTURY PARK EAST SUITE 1100 LOS ANGELES CA 90067

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Chandrasekharan, Shrinidhi Dayton, US 4 30
LaParre, Ronald R Centerville, US 3 18
Shaffer, Alan L Cincinnati, US 3 18
Shepard, Christon L Middletown, US 3 18
Turpin, David L Springboro, US 2 14

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