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0-32 . 0-24 100 % 0-83 0-38 0-29 0-70 0-23 0-26 0-81 0-23 0-24 Iron Silicon Alumina . . • Cold iwork 0-88 0-31 0-17 300 % 0-77 0-46 016 0-85 0-56 0-24 0-72 0-46 0-22 Thickness Iron Silicon 23 MECHANICAL P R O P E R T I E S NUMBER OF T E S T S . For each degree of cold work, two sheets were used for the tensile tests, and in each sheet three test pieces were cut longitudinally and three transversely. THIN SERIES (Sheet 1 m m . t h i c k ) 50 TOO 150 Cold 200 300% 250 Work' F I G . 4»—Variation i n Mechanical (tensile) Properties C o l d "Work.

This ball rests on a circle 90 mm. in diameter taken from t h e sheet to be tested and gripped between two serrated annular rings of 50 mm. internal diameter. B y subjecting the whole apparatus t o a compressional stress between the two plates of a testing machine, steadily increasing pressures can be applied t o the centre of the circle, through t h e ball. This compression is continued right up to the point of rupture of the dome which forms, in t h e sheet, under the pressure of the ball. T h e breaking load, and the depth of the impression made in t h e sheet, at the point of rupture, can t h u s be measured.

T h e following results were o b t a i n e d for t h e t w o series :— Bath Temperature Duration of Time Oil . . 100°—150°—200°—250°—300° 5 minutes. Sodium nitrite . 350°—400°—450°—500° 3 minutes. Pqt^ssium nitrate . 550°—600° 1 minute. * C i Appendix IV. Beport of the Conservatoire des Arts et Metiers. No. 13357, January 24th, 1919. 31 MECHANICAL PROPERTIES TEST P I E C E S 0-5 mm. THICK. T Y P E 1A. Tigs. 7, 8, and 9 summarise the results obtained. STAGES OP A N N E A L I N G . Whatever the amount of work, the following stages can be distinguished:— (i) Region of cold work, (ii) Region of softening, (iii) Region of complete anneal, (iv) Region of f alling-off of Elongation.

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