Accession Number : AD0693455

Title :   CHANGE IN THE STRUCTURE OF A FRACTURE AND THE IMPACT STRENGTH OF 3X13H7C2 STEEL AS A RESULT OF OVERHEATING IN HOT WORKING UNDER PRESSURE AND HEAT TREATMENT,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Konorovich,I. E. ; Tamarina,A. M.

Report Date : 30 JAN 1969

Pagination or Media Count : 9

Abstract : Brittle fracture with a crystalline appearance may develop in steel owing to the presence of pearlite and bainite in the microstructure or owing to the development of temper brittleness and over heating during hot working and heat treatment. The article deals with changes in the structural appearance of fracture of 3X13H7C2 steel (0.28 percent C, 2.5 percent Si, 0.55 percent Mn, 12.9 percent Cr, 6.95 percent Ni, 0.20 percent S, 0.025 percent P) due to overheating during die forging at 850, 950, 1050, 1150 and 1200 degrees C (degree of deformation 40 percent) and heat treatment (quenching from 1050 degrees in water (40 min) plus annealing at 870 degrees C (7 hr), cooling with furnace plus normalizing at 670 degrees C (70 min), cooling in air plus quenching from 850 degrees C (40 min) in oil. Following this treatment specimens of the steel were subjected to mechanical tests at room temperature. (Author)

Descriptors :   (*STEEL, HOT WORKING), HEAT TREATMENT, FRACTURE(MECHANICS), MATERIAL FORMING, AUSTENITE, DISPERSION HARDENING, GRAIN STRUCTURES(METALLURGY), CRACKS, CRACK PROPAGATION, USSR

Subject Categories : Metallurgy and Metallography
      Fabrication Metallurgy
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE