Metal deforming – Process – With temperature maintenance or modification
Patent
1985-02-06
1986-10-21
Larson, Lowell A.
Metal deforming
Process
With temperature maintenance or modification
72377, 148 115R, B21J 500
Patent
active
046178171
ABSTRACT:
An improved hot forming method for metals, alloys and the like, and in particular, for difficult to process high strength and high temperature metals and alloys of particular use in aerospace applications, is described, which comprises the steps of generating flow stress data as a function of strain rate and temperature on samples of the material at predetermined strain within predetermined ranges of temperature and strain rate; determining from that data the strain rate sensitivity and power dissipation efficiency of the material within the ranges of temperature and strain rate represented by the generated data; selecting values of strain rate and corresponding temperature for a selected value of the dissipation efficiency for the material; and hot forming the material at the selected strain rate and temperature values to a predetermined shape. The improved method may be of particular application to forging, extrusion, rolling or other hot forming process appropriate for titanium, aluminum, nickel, cobalt, copper, iron, zirconium and their alloys. A processing map for hot forming each metal or alloy may be generated according to the methods taught.
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Barker Douglas R.
Doraivelu Sokka M.
Gegel Harold L.
Lark Kristine A.
Malas James C.
Larson Lowell A.
Scearce Bobby D.
Singer Donald J.
The United States of America as represented by the Secretary of
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