Conversazione : Burlington House May 9th, 1934.

  • Royal Society
Date:
1934]
Catalogue details

Licence: Public Domain Mark

Credit: Conversazione : Burlington House May 9th, 1934. Source: Wellcome Collection.

    20/32 page 20
    34. Sir Robert Hadfield, Bt., F.R.S. Specimens of Metallurgical Interest, illustrating Pro- perties and Applications of Metals and Alloys, mainly ferrous. 1. Tested specimens illustrating the minuteness of the explorations of the hardness of metals and alloys made possible by the use of the diamond pyramid hardness test. 2. Series of specimensr epresenting stages in the diamond pyramid hardness scale, from lead (D.P.H. No. 4) to tungsten carbide (D.P.H. No. 1500). 3. The critical influence of temperature in the development, by deformation, of magnetic properties in the austenitic and non- magnetic steel containing 18 per cent. of chromium and 8 per cent. of nickel. 4. Structural characteristics of an alloy of iron, chromium, tungsten and aluminium, associated with its behaviour in cold drawing. 5. Surface magnetic effects in manganese steel, caused by decarburisation in heating during manufacturing processes. 6. Photomicrographs illustrating the microstructure of a worn stone crusher jaw of manganese steel, continuously from the surface inwards to a depth of 15-5 mm. Kven at the working surface where the deformation is greatest, and hardness and resistance to abrasion are developed to the fullest extent, the steel retains its austenitic character. _ 7. An alloy of nickel, cobalt and iron, possessing compara- tively low and uniform thermal expansion over the range from room temperature to 600° C. 8. Specimens illustrating the development of materials for metal cutting tools, and the steady increase in their performance. 9. Flange bolts of “ Era 131” steel containing molybdenum, which have successfully withstood for 24 years the severe service demanded in the steam pipe line of an installation working at the high temperature of 875° F. (470° C.) and pressure of 625 lbs. per square inch. 10. Determination of internal stresses in the head of a rail. 1]. Portrait Gallery of 120 distinguished scientists connected more particularly with the development of Metallurgy and Engineering. | |
    digitised image 1
    digitised image 2
    digitised image 3