C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 8/00 (2006.01) B21D 37/01 (2006.01) B21D 37/20 (2006.01)
Patent
CA 2654368
A method of thermo-mechanically processing a preform (65) composed of tool steel and a tool (18) to modify a workpiece (28). The preform (65) has a region (70) containing austenite. The method comprises establishing the region (70) at a process temperature between a martensitic start temperature and a stable austenitic temperature. While at the process temperature, the region (70) is deformed to change an outer dimension and to modify the microstructure to a depth of 1 millimeter or more. The tool (18) comprises a member (20) composed of tool steel. The member (20) includes a first region (30) that extends from the outer surface (22) to a depth of greater than 1 millimeter and a second region (32). The first region (30) 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 (30), and has a different grain orientation than the second region (30).
Chandrasekharan Shrinidhi
Laparre Ronald R.
Shaffer Alan L.
Shepard Christon L.
Turpin David L.
Dayton Progress Corporation
Macrae & Co.
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