Approved For Release 2001/03/07 : CIA-RDP96-00789R003000020009-8 Test Dat 9-15-82 Before Exposure 10-05-82 10-28-82 11-02-82 11-10-82 11-19-82 (3) Refe Table 2B: Test Sample No. 1 (0) Exposed HARDNESS DATA USING ROCKWELL SUPERFICIAL 15N SCALE Test Sample e No.1 75 76 74 72 73.5 73.5 72 70 73 68 72 67 78 77 76 73 73. 73 73 69 72 69 75 75 75 74 7] 72 72 69 72 72 7] 65 Average Value Conversion to of 6 Readings Tensile Strength in psi (3) 76.0 ——_ o> 142 ,000 74.0 —_ 130,000 73.0 _ 124,000 71.5 —_—— 119,000 71.) —_ 115,500 69.3 rr od 106 ,000 Hardness numbers are displayed according to the following pattern corresponding to the test points shown in Figure 1: rence 6 Approved For Release 2001/03/07 : CIA-RDP96-00789R003000020009-8
Approved For Release 2001/03/07 : CIA-RDP96-00789R003000020009-8 Test Date 9-15-82 Before Exposure 10-05-82 10-28-82 11-02-82 11-10-82 11-19-82 Table 2C: Test Sample No. 2 76 75 74 73 70 7] 71 72 71 66 72 64 75 76 75 74 74 73 75 70 73 7] 71 70 Test Sample No. 2(4\) Exposed 77 77 73 75 73 72 70 70 7] 69 72 69 HARDNESS DATA USING ROCKWELL SUPERFICIAL 15N SCALE Average Value Conversion to of 6 Readings Tensile Strength in psi(3) 76.0 ——————t= 142 ,000 74.0 —————~m 130,000 71.8 ———e — 118.500 71.3 ——= 118.200 70.1 ————\ 111,000 69.6 ————= 107,000 Hardness numbers.are displayed according to the following pattern corresponding to the test points shown in Figure 1: (3) Reference 2 5 7 Approved For Release 2001/03/07 : CIA-RDP96-00789R003000020009-8
Approved For Release 2001/03/07 : CIA-RDP96-00789R003000020009-8 Table 2D: Test Sample No. 3 ({2) Exposed HARDNESS DATA USING ROCKWELL SUPERFICIAL 15N SCALE Test Sample Average VaTue Conversion to Test Date No. 3 of 6 Readings Tensile Strength in psi (3) 9-15-82 79.5 79 80 78.9 —__ 166 ,000 Before 79 78 78 Exposure 10-05-82 78.5 78 76 76.2 ~~» 148,000 76 77 72 10-28-82 77 75 77 73.6 —_—++t 127,000 70 7] 72 11-02-82 71.5 76 72 71.6 —_—_____» 118,000 68 71.5 71 11-10-82 77 72 75 71.1 —_—_< 115,000 67.5 67.5 68 11-19-82 73 72 71 70.5 — 112,000 67 70 70 Hardness numbers are displayed according to the following pattern corresponding to the test points shown in Figure 1: (3) Reference 8 Approved For Release 2001/03/07 : CIA-RDP96-00789R003000020009-8
Approved For Release 2001/03/07 : CIA-RDP96-00789R003000020009-8 In Figure 2 the test data are averaged to eliminate the test-to-test variations and the Rockwell scale readings converted to tensile strength expressed in pounds per square inch (Reference 3). The average of measurements taken on the control sample and each of the test samples is displayed over the duration of the experiment. The event summary presented in Table 1 is superposed on Figure 2 to provide a reference for the measurements. Subsequent to the first RAR exposure, large strength reduction of 18,000 psi occurred in Sample 3. The average reduction in tensile strength following each RAR varied between 10,000 and 18,000 psi. Over the duration of the experiment (four RAR exposures) the tensile strength of Sample 3 was recuced by 50,000 psi while the other two samples experienced a 35,000 psi reduction. CONCLUSIONS Annealing definitely occurred in the ‘three hacksaw blades that were exposed to RAR during four PK parties. The hardness of the high carbon steel blades was reduced, as demonstrated by a reduction in tensile strength, between 35,000 and 50,000 psi for each of the exposed blades. The control blade did not vary from its original hardness level during the same time period of this experiment. The final hardness level of the exposed blades was nearly down to the top of the hardness range for annealed steel. This range is also shown on Figure 2. If the results of this experiment were to be duplicated using conventional methods, the hacksaw blades would have to be placed in an annealing furnace for approximately one hour at a temperature between 1450 and 1525 deg. F. Then they would be slowly cooled down to 1200 deg. F (50 deg./hr.). After reaching 1200 deg. F, then the blades could be cooled in air down to room temperature. This annealing procedure typically requires eight to ten hours (Reference 4). Much experimentation remains because there are many unknown factors in how RAR works. Many complex human parameters, such as mental attitudes, 9 Approved For Release 2001/03/07 : CIA-RDP96-00789R003000020009-8
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