Accession Number:

ADA043065

Title:

Weldability of 10 Nickel Modified Type Steel.

Descriptive Note:

Final rept. Jan 75-Jul 76,

Corporate Author:

GENERAL DYNAMICS/FORT WORTH TEX FORT WORTH DIV

Report Date:

1977-05-01

Pagination or Media Count:

102.0

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 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

Subject Categories:

  • Properties of Metals and Alloys
  • Fabrication Metallurgy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE