Elevated-temperature tensile and creep-rupture behavior of alloy 800H/ERNiCr-3 weld metal/2 1/4 Cr-1 Mo steel dissimilar-metal weldments

Technical Report · Mon Nov 01 04:00:00 EST 1982

DOI:https://doi.org/10.2172/708749· OSTI ID:708749

Klueh, R L; King, J F

Tensile tests at room temperature, 510, and 566{sup 0}C and creep-rupture tests at 510{sup 0}C were made on specimens taken from dissimilar-metal welds made on isothermally annealed 2 1/4 Cr-1 Mo steel and mill-annealed alloy 800H plates joined with ERNiCr-3 filler metal. The specimens were machined so that the gage length contained all three alloys; the weld metal was in the center of the gage section. The weldments were tested under several postweld heat treatment (PWHT) and aging conditions. Ductile cup-cone tensile failures occurred in the 2 1/4 Cr-1 Mo steel base metal well removed from the weld fusion line, as expected from the relative base metal properties. For creep at 510{sup 0}C and rupture lifetimes of up to about 2000 h, failure also occurred in the 2 1/4 Cr-1 Mo steel base metal. Three low-stress tests failed in the 2 1/4 Cr-1 Mo steel with low ductility in over 7500 h within 10 {mu}m of the fusion line. Metallographic studies showed that the interface-type failures resulted by a previously proposed mechanism that involves the formation of a chromium-depleted region parallel to the fusion line.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 708749
• Report Number(s): ORNL--5899; ON: TI83025508
• Country of Publication: United States
• Language: English

Related Subjects

21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
36 MATERIALS SCIENCE
CHROMIUM-MOLYBDENUM STEELS
CREEP
FAILURES
INCOLOY 800H
LMFBR TYPE REACTORS
REACTOR MATERIALS
STRESSES
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
WELDED JOINTS
YIELD STRENGTH