Evaluation of high chromium overlays to protect less alloyed substrates from corrosion in a coal gasification atmosphere. Quarterly report, September 1-November 30, 1978

Technical Report · Sun Jan 01 04:00:00 EST 1978

DOI:https://doi.org/10.2172/6053896· OSTI ID:6053896

Sadowski, E. P.

Inspection by Dy-chek and bend tests were completed. All AWS-ER 309 and INCONEL Filler Metal 72 weldments and fifteen of eighteen R139 weldments were bent 180 degrees around a mandrel successfully. Mixed results were obtained on three of the R139 weldments. Hardness testing, tensile and bulk chemical analyses have been completed on all weldments in the as-welded condition. Stress-rupture testing at 1800/sup 0/F has continued. No significant differences were obtained in the tensile strength of weldments due to filler metal, substrate or weld process. The stress rupture tests to date indicate that the substrates and welding process have an effect on the stress rupture strength. The weldments with the INCOLOY alloy 800H substrate with inert gas deposited overlays have the higher stress rupture strength. The submerged-arc weldments had the lowest stress rupture strength for each filler metal and substrate. The Cr content deposited by INCONEL Filler Metal 72 and Cr and Al contents deposited by R139 are encouraging for corrosion resistance in CGA atmospheres. The Cr content of FM72 double layer overlays remained at 40% or higher for a depth of 4 to 7 mm (.16 to .27 inch). Al contents in the range of 2.8 to 3.2% were obtained in double layer overlays of R139 deposited by inert gas metal arc processes. The construction of the test cell for the 1000 hour exposure will be completed in December and the exposure started at that time.

• Research Organization: International Nickel Co., Inc., Suffern, NY (USA). INCO Research and Development Center
• OSTI ID: 6053896
• Report Number(s): FE-2621-5
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404 -- Coal
Lignite
& Peat-- Gasification
36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ALUMINIUM
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CHROMIUM
CHROMIUM ALLOYS
CLADDING
COAL GASIFICATION PLANTS
CORROSION
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
DEPOSITION
ELEMENTS
FABRICATION
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCOLOY 800
INCOLOY ALLOYS
INDUSTRIAL PLANTS
IRON ALLOYS
IRON BASE ALLOYS
JOINING
MATERIALS
MECHANICAL PROPERTIES
METALS
NICKEL ALLOYS
SURFACE COATING
TRANSITION ELEMENTS
WELDING