The Effect of Cold-Rolling on the Modulus of Elasticity of Brass

Very little investigation has been made in America on the effect of cold-work on the modulus of elasticity of metals. As late as the year 1924 doubt was indicated by eminent metallurgists as to whether cold-working caused change in the modulus at all.l However, these metallurgists, through X-ray diffraction diagrams, were acquainted with the fact that cold-working causes certain preferred crystal orientation with reference to the direction of deformation. It has been discovered, later, by working with single crystals, that the modulus of elasticity of a crystal varies with the direction in which it is loaded. Thus in annealed metal, with equiaxed grains, we may expect an identical modulus in all directions. And if cold-work is done on the metal, we may expect a raising of the modulus of elasticity in a certain direction and a lowering in another. A relatively large amount of investigation has been made abroad, but, until recently, it has been of a random nature and conflicting results have been reported for work done with nonferrous metals. Results of the most thorough investigation made to date were published in 1930. This investigation was made on the change in the modulus of elasticity of both ferrous and non-ferrous metals for the two forms of cold-working, known as stretching, and drawing.

The present investigation was made with the purpose of adding data for a third form of cold-working, rolling.