Accession Number : ADA953964

Title :   Armor. Development of a Fracture Test to Indicate the Degree of Hardening of Armor Steels upon Quenching.

Descriptive Note : Experimental rept.,

Corporate Author : WATERTOWN ARSENAL LABS MA

Personal Author(s) : Hurlich,A.

Report Date : 01 AUG 1943

Pagination or Media Count : 54

Abstract : The purpose of this investigation was to develop a test capable of determining the extent of quench hardening of armor steels for application as an inspection control. As the result of the study of a fracture test developed at the Union Steel Casting Division of the Blaw-Knox Company for the purpose of selecting tempering temperatures which would produce optimum ballistic properties in armor, further experiments were performed at this Arsenal to devise a more useful fracture test to indicate the extent of quench hardening of armor. It was found that the appearance of the fractured surface of the low alloy steels used for armor can be correlated with the degree of quench hardening, the microstructure, and the relative impact strength of the material. Incompletely quenched steels (those containing high temperature transformation products) fracture in a brittle manner. Steels which have been completely quench hardened and tempered fracture in a ductile manner. The fracture of completely quench hardened and tempered steel can be readily differentiated from that of incompletely quenched steels.

Descriptors :   *Armor, *Hardening, *Quenching, Steel, Control, Inspection

Subject Categories : Fabrication Metallurgy
      Armor

Distribution Statement : APPROVED FOR PUBLIC RELEASE