Metallurgical Examination of 2-1/2 Inch to 6" Inch Rolled Homogeneous Armor Manufactured by Great Lakes Steel Corporation and Heat Treated by Standard Steel Spring Company

Metallurgical Examination of 2-1/2 Inch to 6
Author:
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Total Pages: 13
Release: 1945
Genre:
ISBN:

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Metallurgical examination, including fracture tests, Brinell hardness surveys, chemical analysis, macroscopic examination, and microscopic examination, was made on sections from 2 1/2-in, 3-in, 4-in, and 65-in thick ballistic test plates that had been made from the same hear and had been submitted jointly by Standard Steel Spring Company and Great Lakes Steel Corporation to Aberdeen Proving Ground for experimental and acceptance ballistic tests. The extensive spalling revealed by the ballistic tests was found to have been caused by extremely poor steel soundness. Because of the numerous laminations present in the fractures, the impact toughness of the plates could not be determined accurately. However, fractures of the 4-in and 6-in plates showed much crystallinity, and each plate, except the 3-in plate, was revealed by Brinell hardness surveys and microscopic examination to have been incompletely quench hardened. Grain sizes were coarse (ASTM No. 2 to 4). When evaluating the ballistic limits of at least the 4-in and 6-in plates, their poor impact toughness as well as their poor steel soundness should be considered.

Metallurgical Examination of Six 1/2 Inch Rolled Homogeneous Armor Plates Manufactured by Great Lakes Steel Corporation

Metallurgical Examination of Six 1/2 Inch Rolled Homogeneous Armor Plates Manufactured by Great Lakes Steel Corporation
Author: M. Yoffa
Publisher:
Total Pages: 9
Release: 1943
Genre:
ISBN:

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This 1944 report discusses a metallurgical examination, including fracture tests for steel soundness and response to heat treatment, Brinell hardness tests, macroetch tests and microscopic examination, which was conducted on sections from six 1 inch thick homogeneous plates. Steel soundness was satisfactory on all but one plate. Poor shock properties, as denoted by crystalline fractures, were observed on all plates at hardnesses above 340 Brinell.

Metallurgical Examination of Thirteen 1/2 Inch Rolled Homogeneous Armor Plates Manufactured by Great Lakes Steel Corporation

Metallurgical Examination of Thirteen 1/2 Inch Rolled Homogeneous Armor Plates Manufactured by Great Lakes Steel Corporation
Author: M. Yoffa
Publisher:
Total Pages: 8
Release: 1944
Genre:
ISBN:

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Metallurgical examination, including Brinell hardness readings, fracture tests for steel soundness and fibre, and macroetch tests, was conducted on each of the thirteen plates furnished by the Great Lakes Steel Corporation. Microscopic examination was made on four plates from heat 9-14043 and a chemical analysis taken of one. All samples fractured in a fibrous manner. All plates were satisfactory with respect to steel soundness. (Author).

Metallurgical Examination of Two 1/4 Inch, Two 3/8 Inch, and Twenty-One 1/2 Inch Rolled Homogeneous Armor Plates Manufactured by Great Lakes Steel Corporation

Metallurgical Examination of Two 1/4 Inch, Two 3/8 Inch, and Twenty-One 1/2 Inch Rolled Homogeneous Armor Plates Manufactured by Great Lakes Steel Corporation
Author: M. Yoffa
Publisher:
Total Pages: 7
Release: 1944
Genre:
ISBN:

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Metallurgical examination, including Brinell hardness surveys, fracture test for steel soundness, and macroetch tests was conducted on each of the twenty-five plates furnished by Great Lakes Steel Corporation. Microscopic examination was made on four plates. All plates except 7A were satisfactory with respect to steel soundness.

Metallurgical Examination of Six 11/2 Inch Rolled Homogeneous Armor Plates Manufactured by Carnegie-Illinois Steel Corporation

Metallurgical Examination of Six 11/2 Inch Rolled Homogeneous Armor Plates Manufactured by Carnegie-Illinois Steel Corporation
Author: N. A. Matthews
Publisher:
Total Pages: 9
Release: 1943
Genre:
ISBN:

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The Proving Center, Aberdeen requested that metallurgical examination be conducted on six (6) 1 1/2 inch rolled homogeneous armor test plates manufactured by the Carnegie-Ilinois Steel Corporation. The six plates were tested at Aberdeen as a part of the large program on the effect of hardness on ballistic properties. The plates, therefore, were from the same heat of steel and were similarly heat treated except for the final draw temperatures which were variedto give the hardnesses desired.

Metallurgical Examination of Fourteen 5/16 Inch Rolled Homogeneous Armor Plates Manufactured by Great Lakes Steel Corporation

Metallurgical Examination of Fourteen 5/16 Inch Rolled Homogeneous Armor Plates Manufactured by Great Lakes Steel Corporation
Author: M. Yoffa
Publisher:
Total Pages: 6
Release: 1944
Genre:
ISBN:

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Metallurgical examination, including Brinell hardness surveys, fracture tests for steel soundness and fibre, and macroetch tests was conducted on each of the fourteen plates furnished by Great Lakes Steel Corporation. Microscopic examination was made on six plates and chemical analyses were taken of two. All plates except two were fibrous. Plates 17 and 19 revealed traces of crystallinity at hardnesses of 388 and 375 respectively. (Author).

Metallurgical Examination of Fourteen 3/4 Inch Rolled Homogeneous Armor Plates Manufactured by Great Lakes Steel Corporation

Metallurgical Examination of Fourteen 3/4 Inch Rolled Homogeneous Armor Plates Manufactured by Great Lakes Steel Corporation
Author: M. Yoffa
Publisher:
Total Pages: 7
Release: 1944
Genre:
ISBN:

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Metallurgical examination, including Brinell hardness surveys, fracture tests for steel soundness and fibre was conducted on each of the fourteen armor plates. Microscopic and macroscopic examinations and chemical analyses were made of selected samples. All the samples except four were satisfactory with respect to steel soundness. Thirteen of the samples responded to heat treatment satisfactorily as revealed by the fibruous manner in which they fractured.

Metallurgical Examination of Twelve 2 1/2 Inch Thick Rolled Homogeneous and Sixteen 2 1/2 Inch Thick Face Hardened Armor Plates Manufactured by Carnegie-Illinois Steel Corporation

Metallurgical Examination of Twelve 2 1/2 Inch Thick Rolled Homogeneous and Sixteen 2 1/2 Inch Thick Face Hardened Armor Plates Manufactured by Carnegie-Illinois Steel Corporation
Author:
Publisher:
Total Pages: 20
Release: 1945
Genre:
ISBN:

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A metallurgical examination was conducted on twelve (12) 2 1/2 in thick rolled homogeneous and sixteen (16) 2 1/2 in thick rolled face hardened armor plates manufactured by Carnegie-Illinois Steel Corporation on OCO-D project 1558. The results of this investigation that, in general, the steel soundness of the face hardened plates was inferior to that of the homogeneous plates. In this connection, the face hardened plates had more pronounced directional properties than the homogeneous plates. The average Brinell hardness of the homogeneous plates was 247-262. The average Brinell hardness of the face hardened series was found to be face, 465-690, and core 208-243. The depth of the effective case at Rockwell C 50 varied from .26 in- 40-in. from the plate (10 plates tested) while in two face hardened plates the case depth was .09-in - 16-in from face of plate. In general, the homogeneous and face hardened plates were properly heat treated resulting in fibrous fractures, good V-notch impact properties and a satisfactory microstructure.

Metallurgical Examination of Sections from Eighteen Rolled Homogeneous Armor Plates

Metallurgical Examination of Sections from Eighteen Rolled Homogeneous Armor Plates
Author: N. A. Matthews
Publisher:
Total Pages: 19
Release: 1944
Genre:
ISBN:

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Metallurgical examination including Brinell hardnesses, fracture tests for steel soundness, fracture tests of response to heat treatment, macroetch tests, microscopic examination, V-notch Charpy impact tests on selected plates, chemical analysis and Jominy hardenability was conducted on eighteen plates submitted by Great Lakes Steel Corporation and tested at the Ordnance Research Center as a part of the effect of hardness program. There were six plates each of the three thicknesses 1-1/8, 1-1/4, and 1-1/2 inches. All plates were fairly satisfactorily heat treated. Three plates were of unsatisfactory quality with respect to steel soundness.

Metallurgical Examination of Twenty-Five 1 1/2 Inch Rolled Homogeneous Armor Plates Manufactured by Republic Steel Corporation

Metallurgical Examination of Twenty-Five 1 1/2 Inch Rolled Homogeneous Armor Plates Manufactured by Republic Steel Corporation
Author: M. Yoffa
Publisher:
Total Pages: 9
Release: 1944
Genre:
ISBN:

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Metallurgical examination, including Brinell hardnesses, fracture tests for steel soundness, fracture tests for response to heat treatment and macroetch tests, was conducted on each of the twenty-five plates furnished by Republic Steel Corporation. Micrtoscopic examination, chamical analyses and Jominy hardenability determinations were made of selected plates. All plates were uniformly satisfactory with respect to steel soundness and were properly heat treated as revealed by the fibrous manner in which all except those samples of the maximum hardnesses fractured.