Accession Number : AD0634747

Title :   MECHANICAL AND METALLURGICAL BEHAVIOR OF RESTRAINED WELDS IN SUBMARINE STEELS.

Descriptive Note : Final rept.,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE WELDING LAB

Personal Author(s) : Adams,Clyde M. , Jr. ; Corrigan,D. A.

Report Date : MAY 1966

Pagination or Media Count : 82

Abstract : The study was made to develop a greater understanding of the thermomechanical aspects of the fusion welding process, particularly the dynamics of residual stress development and its significance in the cracking of HY - 130/150 steel. A method was developed by which the residual stress distribution in an near a weld can be completely and accurately determined. Weldment residual stresses can be obtained rapidly and economically using only standard strain measuring and machining techniques. Three different plate materials HY-130/150, HY-80, and 12% maraging steels were studied. The nominal base metal yield strengths varied from 80,000 to 175,000 pounds per square inch. In HY-80 weldments the maximum residual stresses are longitudinal and of the order of the base metal yield strength. They were a maximum at the weld centerline. In HY130/150 and 12% Ni maraging steels, the maximum tensile stresses are again in the direction of welding. These maximum stress values occur, however, in the weld heat-affected-zone, far removed from the fusion line. Extremely high stress gradients were present in these regions. The observation that weldment residual stresses may be a maximum in regions other than the deposit has apparently not been reported before. An explanation of alloy-to-alloy differences based on the relative temperatures of hot plastic deformation and austenite transformation is proposed.

Descriptors :   (*STEEL, *WELDS), (*STRESSES, STEEL), (*SUBMARINE HULLS, WELDS), MARAGING STEELS, NICKEL ALLOYS, METAL PLATES, FRACTURE(MECHANICS), STRESS RELIEVING, TOUGHNESS

Subject Categories : Metallurgy and Metallography
      Fabrication Metallurgy
      Marine Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE