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The Influence of Multiple Weld Thermal Cycles on the Mechanical Properties of CO Strengthened High Strength Low Alloy Steels

•Copper precipitate strengthened High Strength Low Alloy (HSLA) steels are used in many structural applications that require a combination of strength (up to ~1,000 MPa yield strength) and toughness (~ 140 J impact energy at – 80 ­oC).•For “severe service” alloys, many successive weld repairs may be made on the same region. The potential effect of these multiple thermal cycles and cumulative plastic strain from residual stress (that can accelerate precipitation kinetics) has yet to be addressed.

•Much work has been done for analyzing the mechanical properties and microstructure after one thermal cycle. Little work has been done for multiple weld passes

Industry Sponsor: LANL, Lincoln Electric, ThermoCalc

Faculty: John DuPont (Lehigh)

Graduate Student: Jonah Duch

Industry Contact: Matt Johnson, Badri Narayanan, Marie Quintana, Adam Hope