The interfacial microstructure of weld overlay of corrosion resistant alloys

Journal Article · Sun May 01 04:00:00 EDT 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90327-1· OSTI ID:5226215

Wu, Yunjian; Patchett, B M; Bicknell, C ^[1]

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1. Univ. of Alberta, Edmonton, Alberta (Canada)

For reasons of economy, hydrogenation pressure vessels of heavy wall sections are fabricated by cladding with one or more layers of austenitic stainless steel on the inside of the vessel wall. Submerged Arc Welding with strip-electrode technology is used in this process because of its ability to combine excellent deposit properties and controllable penetration with high deposition rates. However, hydrogen-related disbonding of the clad-overlay is a problem remaining in the use of the composite pressure vessels in petrochemical industries. One of the major factors contributing to the disbonding is the microstructure developed during solidification of the weld metal. It is unclear what kind of microstructure is most susceptible to disbonding and how the microstructure develops. Marshall and Lazor et al. believed that martensitic structures were the culprit for the initiation of disbonding. Ohnishi et al. concluded from their investigation that a layer of martensite adjacent to the fusion line would reduce the disbonding. Recently, Godden et al. found that a so-called Type 2 grain boundary was the most susceptible structure to the disbonding, but the mechanism is not clear. This study investigated the microstructures along the interface between overlays and base steel and established the mechanism of the formation of crack-susceptible microstructures.

• OSTI ID: 5226215
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 30:9; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
ALLOYS
COMPOSITE MATERIALS
CONTAINERS
DATA
EXPERIMENTAL DATA
FAILURES
HIGH ALLOY STEELS
INFORMATION
INTERFACES
IRON ALLOYS
IRON BASE ALLOYS
LOW ALLOY STEELS
MATERIALS
MICROSTRUCTURE
NUMERICAL DATA
PRESSURE VESSELS
STAINLESS STEELS
STEELS