Effect of small additions of niobium on the welding behavior of an austenitic stainless steel

Conference · Sat Jan 01 04:00:00 EST 1977

OSTI ID:6760903

Moorhead, A. J.; Sikka, V. K.; Reed, R. W.

To systematically study the effect of niobium on the behavior of Type 304 stainless steel, a low-niobium commercial heat was remelted with varying niobium additions - up to 1000 ppM. A standardized weldability test, the Spot Varestraint, was used to compare the propensity of various heats for hot cracking. The fusion and heat-affected zone cracking behavior of the experimental heats was similar to that of a heat of commercial Type 304, and much superior to that of a commercial heat of Type 347 stainless steel. The superior resistance to fusion zone cracking was attributed to the presence of a small amount of delta ferrite in the microstructure of the weld nugget in the experimental materials. The outstanding heat-affected zone cracking behavior was at least partly attributable to backfilling of grain boundary separations in the experimental heats, as well as in the commercial Type 304.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6760903
• Report Number(s): CONF-771140--4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
FRACTURE PROPERTIES
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MECHANICAL PROPERTIES
NICKEL ALLOYS
NIOBIUM ADDITIONS
NIOBIUM ALLOYS
PERFORMANCE TESTING
STAINLESS STEEL-304
STAINLESS STEEL-347
STAINLESS STEELS
STEELS
TENSILE PROPERTIES
TESTING
WELDABILITY