COLUMBIUM ALLOY EXTRUSION PROGRAM. Phase V. Tubing Program Interim Report VII, October 15, 1962-January 158 1963
An additional B-66 ingot and an X-110 ingot, each 8 in. in dia., were melted and converted to 4 in. round billet stock by warm extrusion. This brought the total of 8 in. dia. ingots used in this phase of the contract to six, three of each alloy. The additional ingots were required to offset the low yield incurred in the initial tube blank extrusion campaign. The major effort in this three-month period was the development of the tube blank extrusion operation. A process was developed which produced tube blanks with much improved surfaces over the initial extrusions in the program. The improvement was attributed to the refinement of the glass lubrication practice used in conjunction with a cone die. Transverse checks persist on the inside surface, however. A total of 23 extrusions were attempted, all at 3000 to 3200 deg F. Die type, glass lubrication practice, and billet design were the major parameters investigated. Seventeen of the 23 billets were extruded but only 13 tube blanks were considered satisfactory for the tube reduction program. Considerable difficulty was encourtered in conditioning. A major problem arose in conditioning the outside surface of the tube blanks. Repeated straightening attempts at ambient temperature resulted in fracture. A deep pickling operation combined with hand-grinding to remove surface defects was the most effective method of conditioning. The first tube reduction on the initial batch of four X-110 tube blanks was completed. The two B-66 tube blanks cracked radially in the first tube reducing pass A possible source of the cracks is residual extrusion surface defects, present despite extensive conditioning prior to the tube reduction. (auth)
- Research Organization:
- Du Pont de Nemours (E.I.) & Co. metals Center, Baltimore
- NSA Number:
- NSA-17-011140
- OSTI ID:
- 4718103
- Report Number(s):
- AMC-TR-7-775(VII)
- Country of Publication:
- United States
- Language:
- English
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