Ultra-low -carbon-bainitic steel for weld metal

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:115478

Vassilaros, M G

An investigation has been performed in the area of ultra-low-carbon-bainitic (ULCB) steels for weld metals. Weld metal tensile specimens of the autogenous ULCB steel welds were tested for measurements of the as-deposited strength. Additionally, to evaluate the thermal effects of multiple passes on weld metal strength, additional eld metal specimens were thermally cycled in a weld thermal simulator before being final machined and tested. The measured strength of the as-deposited weld metals typically ranged between 100 to 130 ksi (700 to 900 MPa) and did not vary significantly with heat input. Additionally, the strength values were less than those calculated with published models of bainitic strength versus chemistry. In summary, the 0.02 wt% C, Mn-Mo-Ni, ULCB weld metal achieved yield strengths ranging from 100{emdash}130 ksi and demonstrated significantly less sensitivity to cooling rate variations than demonstrated by conventional weld metals. These results may lead to the development of new ULCB weld metal compositions which should offer three significant over conventional weld metals: (1) cooling-rate-insensitive strength, allowing a larger welding parameter window; (2) less change in toughness due to yield strength changes; (3) less chance of hydrogen-assisted cracking due to a minimized as-deposited hardness.

• OSTI ID: 115478
• Report Number(s): CONF-9404233--
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BAINITE
COOLING
HYDROGEN EMBRITTLEMENT
STEELS
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
WELDED JOINTS
YIELD STRENGTH