Container design is used to convert partially densified powder metallurgy compacts into fully densified slabs in one processing step. Technique improves product yield, lowers costs and yields great flexibility in process scale-up. Technique is applicable to all types of fabricable metallic materials that are produced from powder metallurgy process

Sellman, W. H.

Weinberger, W. R.

English

NASA Technical Reports Server

ROLL CONSOLIDATION CAN CONFIGURATION
'March 1973	 B73-10040 
NASA TECH BRIEF 
Lewis Research Center 
NASA Tech Briefs announce now technology derived from the U.S. space program. They are issued to encourage 
commercial application. Tech Briefs are available on a subscription basis from the National Technical Information 
Service, Springfield, Virginia 22151. Requests for individual copies or questions relating to the Tech Brief program may 
be directed to the Technology Utilization Office, NASA, Code KT. Washington, D.C. 20546. 
DENSIFICATION OF POWDER METALLURGY 
BILLETS BY.A ROLL CONSOLIDATION TECHNIQUE 
Gas Inlet & Outlet Pubes 
Hand Fitted 
Cover Plates 
Ndge Borders 
All Four Corner 
Joints Butt 
Welded 
A roll consolidation process utilizing a novel container 
design has been developed to convert partially densified 
powder metallurgy compacts into fully densified slabs in 
one processing step. Basically, this roll consolidation 
technique consists of combining laboratory state-of-the-
art powder metallurgy practices and scaling them up to 
handle slabs weighing over 45 kg (100 pounds). This 
technique improves product yield, lowers costs and yields 
great flexibility in process scale-up'; it is a significant 
improvement in the commercial production of dispersion-
strengthened sheet materials. 
The densification of powder metallurgy compacts by 
this technique consists of placing partially densified 
compacts in a frame or container consisting of suitable 
metal edge borders welded along the seams. The cavity 
volume of the frame is between 85 and 100 percent of the 
volume at full theoretical density of the compact to be 
inserted. Inlet and outlet gas tubes are positioned at each 
end of the unit along one edge of the container. The 
partially densified compact is placed in the frame and 
hand-fitted cover plates are welded in position top and 
ci
bottom to form a leak tight unit. The component parts 
making up this unit prior to final weld assembly are 
shown in the figure. 
The assembled unit is purged with hydrogen gas to 
reduce surface oxides and remove entrapped air, and 
placed in a furnace heated to the appropriate temperature 
determined by previous forging and/or extrusion prac-
tices. It is held in the furnace for a sufficient time to 
effect a thorough heat soak and attain uniform tempera-
ture and proper internal container atmosphere. The inlet 
and outlet gas tubes are then sealed and pinched off, and 
the unit is removed from the furnace. The hot unit is 
rolled on a rolling mill having a roll gap setting equivalent 
to the thickness of the frame unit thickness. Densification 
is accomplished in one roll pass. Subsequent passes on the 
mill at reduced gap settings further reduces the compact 
(slab) to the desired thickness of sheet material. 
For certain materials, it is satisfactory to combine 
densification and breakdown rolling in the first pass 
though the mill avoiding the need for separate passes for 
each purpose.
(continued overleaf) 
This document was prepared under the sponsorship of the National	 Government assumes any liability resulting from the use of the 
Aeronautics and Space Administration. Neither the United Slates 	 information contained in this document, or warrants that such use 
Government nor any person acting on behalf of the United States
	
will be free from privately owned rights.
https://ntrs.nasa.gov/search.jsp?R=19730000040 2020-03-17T06:41:48+00:00Z
NOTES: 
1. Utilization of this roll consolidation technique is 
applicable to all types of fabricable metallic materials 
that are produced from a powder metallurgy process. It 
is particularly applicable to the production of powder 
metallurgy mill products made from specialty alloys 
such as dispersion modified metals. 
2. The following documentation may be obtained from: 
National Technical Information Service 
Springfield, Virginia 22151 
Single document price $26.50 
(or microfiche $0.95) 
Reference: NASA CR-120796 (N73-11512), Final 
Report -- Development of Dispersion Strengthened 
Nickel-Chromium Alloy (Ni-Cr-Th0 2 ) Sheet for 
Space Shuttle Vehicles 
3. Technical questions may be directed to: 
Technology Utilization Officer 
Lewis Research Center 
21000 Brookpark Road 
Cleveland, Ohio 44135 
Reference: B73-10040 
PATENT STATUS: 
NASA has decided not to apply for a patent. 
Source: W.H. Sellman and W.R. Weinberger

Fansteel, Inc.

under contract to

Lewis Research Center

(LEW-1 1395)
. 
. 
B73-10040	 Category 08


Densification of powder metallurgy billets by a roll consolidation technique

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