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

A method of thermo-mechanically processing a preform (64) composed of tool steel and a tool (18) to modify a workpiece (28). The preform (64) has a region containing austenite. The method comprises establishing the region at a process temperature between a martensitic start temperature and a stable...

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Hauptverfasser:	LAPARRE, RONALD, R, SHEPARD, CHRISTON, L, SHAFFER, ALAN, L, CHANDRASEKHARAN, SHRINIDHI, TURPIN, DAVID, L
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CASTING CHEMISTRY GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS POWDER METALLURGY PUNCHING METAL TRANSPORTING WORKING METALLIC POWDER WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
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creator	LAPARRE, RONALD, R SHEPARD, CHRISTON, L SHAFFER, ALAN, L CHANDRASEKHARAN, SHRINIDHI TURPIN, DAVID, L
description	A method of thermo-mechanically processing a preform (64) composed of tool steel and a tool (18) to modify a workpiece (28). The preform (64) 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 (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).
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The preform (64) 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 (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). 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The preform (64) 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 (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).</abstract><oa>free_for_read</oa></addata></record>
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subjects	CASTING CHEMISTRY GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVINGMATERIAL METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS PERFORMING OPERATIONS POWDER METALLURGY PUNCHING METAL TRANSPORTING WORKING METALLIC POWDER WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS ORPROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL
title	Methods of thermo-mechanically processing tool steel and tools made from thermo-mechanically processed tool steels
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