Weldability of 10 Nickel Modified Type Steel.

Abstract
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 impurity/deoxidizing 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 K(ISCC) - 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)

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