Creep and rupture properties of virgin 1-1/4Cr-1/2Mo plate and submerged arc weldments

Book · Fri Dec 01 04:00:00 EST 1995

OSTI ID:132202

Ellis, F V; Lin, Y C ^[1]; Tordonato, S ^[2]

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1. Tordonato Energy Consultants, Inc., Chattanooga, TN (United States)
2. Tordonato Energy Consultants, Inc., Clifton, VA (United States)

The submerged arc welding process was used to join 19mm thick 1-1/4Cr-1/2Mo steel plate material. Following welding, the weldment was given a renormalizing and tempering heat treatment. Chemical analysis, metallurgical examination, tensile testing and creep rupture testing were performed. For the weld metal, the carbon content was 0.069% and the oxygen content was 0.081%. The measured tensile properties for the base material were within the scatter band for virgin plate material. Creep rupture testing was performed at stresses from 41.4 MPa to 137 MPa and temperatures from 600 C to 680 C. The measured rupture time for the renormalized and tempered SAW weldment was approximately equal to that for minimum strength unexposed base metal. The failure path was the weld metal remote from the fusion interface. The measured rupture strength for the base material was above average compared to that for unexposed base metal. The minimum creep rate and 0.2% offset tertiary time and strain data were determined. Power law, exponential and rational polynomial primary plus steady state creep equations were fit to the data. The minimum creep rate was correlated using a Dorn parameter and the primary creep coefficients were correlated with the minimum creep rate and rupture time. Tertiary creep was described using the exponential strain softening creep equation.

• OSTI ID: 132202
• Report Number(s): CONF-950740--; ISBN 0-7918-1347-9
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
EXPERIMENTAL DATA
HEAT RESISTANT MATERIALS
MATERIALS TESTING
MECHANICAL PROPERTIES
MICROSTRUCTURE
STEEL-CRMO
WELDED JOINTS