Accession Number : AD0714294

Title :   Unidirectionally Solidified Wrought Steel Armor.

Descriptive Note : Final technical rept. 6 Mar 69-5 Jun 70,

Corporate Author : UNITED STATES STEEL CORP MONROEVILLE PA APPLIED RESEARCH LAB

Personal Author(s) : Bieniosek,C. E.

Report Date : 01 SEP 1970

Pagination or Media Count : 83

Abstract : Prior work showed that superior-quality homogeneous wrought steel armor plate could be produced from 240-pound unidirectionally solidified slab castings. The work reported here indicated that scaling up from 240- to 500-pound castings did not impair the ballistic properties of plates produced from these castings. Optimum ballistic properties were obtained in 3/4-inch-thick homogeneous plates rolled from unidirectionally solidified castings that were produced from a clean, vacuum-melted steel containing 0.45 to 0.50 percent carbon. Homogenization treatment resulted in better ballistic performance than did no homogenization. Plates rolled from unidirectionally solidified steel had higher merit ratings than did equivalent plates rolled from conventionally solidified ingots. The highest velocity merit rating obtained in this program was 1.44, but that homogeneous plate fractured. Dual-hardness plates produced from unidirectionally solidified steel did not show an improvement in ballistic properties comparable to the improvement experienced with homogeneous plates. Lack of a strong bond between the front and back plates significantly impaired the ballistic performance of the dual-hardness plates. (Author)

Descriptors :   (*ARMOR PLATE, *STEEL), CASTINGS, HARDNESS, CASTING, ROLLING(METALLURGY), HEAT TREATMENT, MICROSTRUCTURE

Subject Categories : Armor

Distribution Statement : APPROVED FOR PUBLIC RELEASE