Metallurgical Examination Of Experimental 3 8 Inch Face Hardened Armor
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| Author | : B. Phelps |
| Publisher | : |
| Total Pages | : 10 |
| Release | : 1944 |
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Download Metallurgical Examination of Experimental 3/8 Inch Face Hardened Armor Book in PDF, Epub and Kindle
A metallurgical examination was conducted on two 3/8 inch experimental face hardened plates which were prepared by the Buick Motors Division of the General Motors Corporation under NRC Project 30. The plates were made from a low alloy rolled steel 94T20, which was gas carburized. The samples examined were of good quality rolled armor heat treated so as to have a high face hardness (700 BHN), high core hardness (444 BHN), and superior toughness in the core. These plates differed from four examined previously (Watertown Arsenal Laboratory Memorandum Report No. WAL 710/631) in that plate 600 was carburized more deeply and plate 601 less than in the previous plates.
| Author | : E. I. Reed |
| Publisher | : |
| Total Pages | : 24 |
| Release | : 1941 |
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Download Metallurgical Examination of a Face Hardened and a Homogeneous 2 Inch Experimental Armor Plate Book in PDF, Epub and Kindle
The purpose of this investigation was to determine the difference in metallurgical properties of a homogeneous plate and a carburized plate, each 2 inch thick and rolled from the same experimental heat. The carburized plate failed on ballistic testing because of a large back spall approximately 6 in x 7 in size. In addition, the ballistic limit of the ductile homogeneous plate was 68 ft/sec higher than the carburized plate. Lt. Col. S.B. Ritchie, who witnesses the ballistic testing of these plates at Aberdeen Proving Ground, suggested that they be sent to Watertown Arsenal for metallurgical examination. The representative of Henry Disston & Sons, Inc. (manufactures of the plate) concurring with this suggestion, forwarded 12 in x 12 in sections cut from each of the plates to Watertown Arsenal for study.
| Author | : E. L. Reed |
| Publisher | : |
| Total Pages | : 66 |
| Release | : 1942 |
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Download Armor Plate - Face Hardened: Ballistic and Metallurgical Investigation of Experimental Low Alloy Face Hardened Armor Book in PDF, Epub and Kindle
This report describes a suitable low-alloy composition for thin face hardened armor plates including a comparison of the ballistic and metallurgical properties of armor from seven experimental heat treatment of steel.
| Author | : P. V. Riffin |
| Publisher | : |
| Total Pages | : 14 |
| Release | : 1944 |
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Download Metallurgical Examination of Sections from 3-5 In. Thick Face Hardened Armor Book in PDF, Epub and Kindle
Samples from 3, 4, and 5-in. thick face hardened plates, which were used for projectile testing, were examined metallurgically. Heat treatment was excellent and steel soundness characteristics were satisfactory on all samples except one from the 4-in. plate. Insufficient data was obtained upon which to recommend a testing procedure for controlling the uniformity of such plates employed for projectile testing. However, a fracture test will indicate plate unsoundness, if present, whether or not heat treatment was satisfactory, and will yield a satisfactory indication of case depth.
| Author | : E. L. Reed |
| Publisher | : |
| Total Pages | : 43 |
| Release | : 1943 |
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| ISBN | : |
Download Armor - Preliminary Metallurgical Studies of Experimental Face Hardened Cast and Rolled Armor Book in PDF, Epub and Kindle
The object of this study was to determine by a series of preliminary heat treatments whether a satisfactory hard case may be obtained on the surface of a 1.4-in. thick cast armor in conjunction with a sorbitic or tempered martensitic core at an approximate hardness of 270 Brinell and, if successful, to study further the ballistic possibilities of such a material. The rsults of this preliminary investigation indicative that this process of casting face hardened armor plate is not practical.
| Author | : M. Yoffa |
| Publisher | : |
| Total Pages | : 12 |
| Release | : 1943 |
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Download Metallurgical Examination of Ten 1 Inch Face Hardened Armor Plates Manufactured by American Car and Foundry Company Book in PDF, Epub and Kindle
The results of the metallurgical examination show that all the face hardened armor plates possessed approximately the same face hardness of 444 Brinell and core hardness of 330 to 350 Brinell. The metallurgical tests included chemical analyses, harness surveys, fracture tests, hardenability, macro and microscopic examinations of plates from three heats.
| Author | : |
| Publisher | : |
| Total Pages | : 24 |
| Release | : 1944 |
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Download Metallurgical Examination of Face Hardened Armor Plate Book in PDF, Epub and Kindle
This investigation indicates that the fibre fracture test applied to face hardened armor will probably enable prediction as to whether or not the plate will resist cracking under projectile impact. Furthermore, the steel soundness may be ascertained and the approximate case depth can be determined. The total depth of the carburized case as revealed by the fracture test coincides fairly well with the depth of the case as determined by macroscopic and microscopic examination and by the analysis of the carbon distribution in the case. The Vickers Brinell hardness survey indicated the depth of the effective case.
| Author | : E. L. Reed |
| Publisher | : |
| Total Pages | : 53 |
| Release | : 1944 |
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| ISBN | : |
Download Armor Plate - Rolled. Investigation of Experimental Heat Treatments of 3/8 Inch Thick Homogeneous Armor Plate Book in PDF, Epub and Kindle
This report provides the ballistic and metallurgical proporties of experiemental and production analyses of 3/8 inch thick homogeneous armor plate which has been austempered or quenched and tempered to hardnesses common to hard homogenous armor.
| Author | : E. L. Reed |
| Publisher | : |
| Total Pages | : 37 |
| Release | : 1941 |
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Download Metallurgical Examination of Experimental 2 Inch Rolled Disston Armor Plates (Carburized and Homogeneous). Book in PDF, Epub and Kindle
The purpose of this investigation was to make a metallurgical examination of these plates similarly quenched in order to determine the cause of discrepancy in hardness on the rear face of the carburized plate and the same heat of steel in the homogeneous condition. The results of this investigation indicate that: the hardness differential on the face hardened plate is due to pronounced decarburization on the back of the plate. The rear face of the face hardened plate was decarburized to a depth of about 1/4 inch while the homogeneous plate was decarburized to a depth of only 1/32-in- 1/16-in. The grain size of the face hardened plate and the homogeneous plate was practically the same and.
| Author | : E. L. Reed |
| Publisher | : |
| Total Pages | : 6 |
| Release | : 1946 |
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Download Metallurgical Examination of Japanese Face Hardened Cast Armor Book in PDF, Epub and Kindle
The 1 1/2 in. thick sample of Japanese cast armor face hardened by an experimental high frequency induction method contained C .69, Mn .37, Si .33, Cr 1.04, and Mo 0.51. The depth of case was 0.21 inch. The case had a fine martensitic structure with areas of undissolved carbides present. The microstructure of the steel base consisted of fine pearlite resulting from a normalizing treatment. The Vickers hardness of the outer layers of the case was about 812 while the Vickers hardness of the steel base averaged about 312. It is believed that the steel base employed by the Japanese would possess poor ballistic shock properties due to the fact that the carbon content is very high and also since the steel base had been given an improper heat treatment, namely, a normalizing treatment resulting in a fine pearlitic structure. The sample investigated which contains a high percentage of carbon and molybdenum may not be representative of Japanese armor. It is believed, however, that a steel of high carbon content was employed for induction hardening in order to produce a maximum face hardness.
