Accession Number : AD0616929

Title :   EFFECT OF STRESS-RELIEF TREATMENTS ON THE MECHANICAL PROPERTIES OF 5NI-CR-MO-V WELDMENTS.

Descriptive Note : Technical rept.,

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

Personal Author(s) : Connor,L. P. ; Rathbone,A. M.

Report Date : 01 MAR 1965

Pagination or Media Count : 34

Abstract : A study was made to determine the effects of stress relieving on the mechanical properties of the weld-heataffected zone and weld metal in 5Ni-Cr-Mo-V weldments. The impact properties of grain-coarsened heat-affected zones were determined for two production heats of 5NiCr-Mo-V steel and for two Laboratory heats of modified 5Ni-Cr-Mo-V steel. In addition, the tensile and impact properties of stress-relieved 2Mn-2Ni-Cr-Mo weld metal were determined. The results indicated that the transition temperature of the as-welded grain-coarsened region (-100 F) was almost as low as that of the unwelded plate (-165 F). In contrast, a moderately extensive stress relief (16 hours) increased the transition temperature of the heat-affected zone of the 5Ni-Cr-Mo-V normalmanganese production steels to about 175 F for air cooling after stress relieving and to about 265 F for furnace cooling after stress relieving. However, the same stress relief increased the transition temperature of the heat-affected zone of the low-manganese 5Ni-CrMo-V steel only to 25 F for both cooling rates after stress relieving. Results of mechanical-property tests on stress-relieved 2Mn-2Ni-Cr-Mo weld metal indicated that the stress-relief treatment did not cause a sifnificant loss in yield strength but did cause a moderately large increase in Charpy V-notch transition temperature (from -130 to +100 F). (Author)

Descriptors :   (*STEEL, WELDS), (*SUBMARINE HULLS, METAL PLATES), (*HEAT TREATMENT, STEEL), NICKEL ALLOYS, CHROMIUM ALLOYS, MOLYBDENUM ALLOYS, VANADIUM ALLOYS, MECHANICAL PROPERTIES, STRESSES, MANGANESE ALLOYS, NICKEL ALLOYS, TENSILE PROPERTIES, TRANSITION TEMPERATURE, MICROSTRUCTURE, BRITTLENESS, SHOCK RESISTANCE

Distribution Statement : APPROVED FOR PUBLIC RELEASE