Strip Cladding of Propeller Shafts with Nickel Alloy 625 by Electroslag Surfacing

Autor:	Y. P. Gao, W. E. Wood, Q. H. Zhao, J. H. Devletian
Rok vydání:	1993
Předmět:	Cladding (metalworking) Engineering Silicon business.industry Mechanical Engineering Metallurgy chemistry.chemical_element Ocean Engineering Laves phase Carbide Nickel Cracking chemistry Impurity Nickel alloy business
Zdroj:	Journal of Ship Production. 9:173-180
ISSN:	1542-0469 8756-1417
DOI:	10.5957/jsp.1993.9.3.173
Popis:	A comprehensive comparison between electroslag surfacing (ESS) and submerged arc surfacing (SAS) using 30-mm-wide (1.2 in.) χ 0.5-mm-thick (0.020 in.) nickel alloy 625 strip was conducted in both the as-deposited and stress relieved (at 650°C [1200°F]) conditions. In most cases, exactly duplicate cladding conditions were used to best compare ESS with SAS. Nickel alloy 625 strip was deposited on 10-cm-thick (4 in.) flat plates and 64-cm-diameter (25 in.) shafting (both MIL-S-23284 Class 1 steel) using optimized ESS and SAS processes. Tension and face and side bend tests were performed on as-welded and stress-relieved cladding at room temperature. Microstructural analyses of the clad specimens were performed using optical and electron microscopy. Cladding parameters were found to affect the dilution, deposition rate, and penetration. Although ESS and SAS cladding possessed similar strength levels, the cladding deposited by ESS was shown to have greater ductility than that by SAS. Also, the resistance to solidification cracking of cladding by ESS was superior to SAS because of the reduced silicon, carbon, oxygen, and impurity levels which promote interdendritic Laves phase, niobium-rich MC carbides and inclusions. Compared with SAS, the ESS method proved to be not only more metallurgically favorable but also cost-effective.
Databáze:	OpenAIRE
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