Evaluation of High Chromium Overlays to Protect Less Alloyed Substrates from Corrosion in a Coal Gasification Atmosphere. Quarterly Report,March 1--May 31, 1978.

摘要

Three-quarters of the welding is complete and pre-exposure testing started on one-half of the completed weldments in this program to produce overlays resistant to corrosion in coal gasification atmospheres at 982exp 0 C (1800exp 0 F). The welding processes were:submerged-arc (SAW),gas metal-arc (GMAW) and gas tungsten-arc with a hot wire addition (GTAW--HW). Pre-exposure testing was continued. The tests consisted of hardness surveys,bend,tensile,stress-rupture,bulk chemical analysis of the overlay and microprobe analysis for the distribution of major alloying elements from the outside edge of the overlay to the center of the base plate. The results are described briefly. (ERA citation 04:038061)