ELEVATED TEMPERATURE PROPERTIES OF MODIFIED TYPE 347 WELD METALS
Two fully austenitic modified Type 347 weld metals were shown to possess stress-rupture strength superior to that of Type 347 base material at 1000, 1200, and 1300 deg F on the basis of all-weld-metal and transverse stress-rupture tests. One weld-metal composition was fully austenitic by virtue of high manganese (5%) and the other via high (0.12%) carbon. The stress-rupture strength of the present standard partially ferritic Type 347 weld metal was found to be above that of Type 347 base material. Annealing generally improved the stress-rupture ductility of the niobiumbearing welds. A Type 308L weld deposit was found to be below Type 304L base plate in stress-rupture strength between 1000 and 1300 deg F. All-weld-metal specimens of five different compositions were tested in conventional elevatedtemperature tensile tests and were found to exhibit the characteristic ductility dip at 1800 to 1900 deg F. Standard Type 347 weld metal containing 7% ferrite exhibited the lowest ductility, with Type 308L being almost as poor. High-manganese 347 and 16Cr-8Ni-2Mo weld deposits were significantly above standard 347 weld metal in tensile ductility. The high-carbon 347 weld showed a more modest tensile ductility improvement over standard Type 347 weld metal. In hot-ductility tests the partially ferritic weld deposits, standard Type 347 and Type 308L, exhibited good hot-ductility characteristics. The fully austenitic high-manganese and high-carbon 347 weld deposits were slow to recover ductility on cooling from 2400 or 2450 deg F but various commercial qualification tests have shown these electrodes to be practical, usable compositions for production welding. In a brief investigation of the effect of varying rate of strain in the standard tensile test, it was indicated that rate of strain is the most significant mechanical factor in establishing tensile ductility at the "low ductility" temperature of 1800 deg F. (auth)
- Research Organization:
- Arcos Corp., Philadelphia
- NSA Number:
- NSA-14-003791
- OSTI ID:
- 4227024
- Journal Information:
- Welding J. (N.Y.), Journal Name: Welding J. (N.Y.) Vol. Vol: 38
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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