Weldability of 10 Nickel Modified Type Steel.
Final rept. Jan 75-Jul 76,
GENERAL DYNAMICS/FORT WORTH TEX FORT WORTH DIV
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Several filler metal heats, melted to a base composition of 14Co-10Ni-2Cr-1Mo-0.16C-bal Fe AF 1410 steel with controlled levels of impuritydeoxidizing elements, were evaluated by three arc welding processes. The CW-GTAW deposited weld metal exhibited the best balance between strength and toughness. Maximum fusion zone toughness was associated with low levels of Al, S, and O. A high purity filler metal composition deposited by the CW-GTAW process resulted in post weld aged mechanical properties of TYS-212 Ksi 1462 MPa, TUS-224 Ksi 1544 MPa, CVN absorbed energy - 43.5 ft-lbf 58.9J, and KISCC - 91 KSI square root of in. 100 MPA square root of M. The post weld aged HAZ notch toughness exceeded 34 ft-lbf 46.1J absorbed energy at equivalent FZ strength levels for all the arc weld processes evaluated. The as-deposited last pass CW-GTAW fusion zone microstructure consisted of dislocated lath martensite, minor quantities of interlath retained austenite, and widmanstatten cementite. Post weld aging of multi-pass weld microstructures led to complete dissolution of cementite platelets in favor of alloy carbide precipitation and large amounts of reverted austenite at lath boundary and intralath sites. Author
- Properties of Metals and Alloys
- Fabrication Metallurgy