Metallurgical Examination of Sample from Cast Hull Front Section E9049, Serial Number 32.
WATERTOWN ARSENAL LABS MA
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A metallurgical examination, including fracture tests, Brinell hardness surveys, Charpy tests, chemical analyses, and microscopic examination was made on one sample from a Cast Hull Front Section E9049, Serail No.32 4-in. x 12-in x 24-in manufactured by the Continental Foundry Machine Company. Spalling in the sample was associated chiefly with susceptibility to temper brittleness and in some degree to slack quenching. Samples as-received exhibited various amounts of crystallinity distributed throughout the section at a Brinell hardness of 255-285. Samples of this material which were retempered at 1175 degrees F. and water quenched exhibited a nearly completely fibrous fracture with noticeable increase in V-notch Charpy impact values at -40 F.
- Properties of Metals and Alloys
- Marine Engineering