scholarly journals Influence of Al and Ti on hot cracking sensitivity of weld heat affected zone in Incoloy 800 through hot ductility characteristics.

1987 ◽  
Vol 27 (7) ◽  
pp. 580-589 ◽  
Author(s):  
Kiichi SAITO ◽  
Masahiro AOKI ◽  
Hisashi KONDO
Keyword(s):  
Heat Affected Zone ◽  
Hot Cracking ◽  
Hot Ductility ◽  
Incoloy 800 ◽  
Weld Heat ◽  
Cracking Sensitivity

Metallurgical Factors Influencing Hot Ductility of Austenitic Steel Piping at Weld Heat-Affected Zone Temperatures

1963 ◽  
Vol 85 (2) ◽  
pp. 151-164 ◽  
Author(s):  
T. M. Cullen ◽  
J. W. Freeman
Keyword(s):  
Liquid Phase ◽  
Austenitic Steel ◽  
Heat Affected Zone ◽  
Variable Temperature ◽  
Hot Ductility ◽  
Carbon And Nitrogen ◽  
Factors Influencing ◽  
Nitrogen Contents ◽  
Steel Piping ◽  
Weld Heat

The variable hot ductility of wholly austenitic Type 347 steel was found to be associated with the variable temperature of formation of a liquid phase (liquation temperature) in the microstructure of the steel. In wholly austenitic materials a low liquation temperature leads to poor hot ductility. The liquation temperature of the steel was determined to be a function of its columbium, carbon, and nitrogen contents. When ferrite is present in the steel, poor hot ductility can also occur as a result of the crack sensitivity of the two-phased structure.

scholarly journals Hot Cracking Susceptibility of 800H and 825 Nickel-Base Superalloys during Welding via Spot Varestraint Test

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Chih-Chun Hsieh
Keyword(s):  
Heat Affected Zone ◽  
Molten Pool ◽  
Hot Cracking ◽  
Two Phase ◽  
Gas Tungsten Arc ◽  
Transgranular Crack ◽  
Varestraint Test ◽  
Nickel Base Superalloys ◽  
Nickel Base ◽  
Cracking Sensitivity

Hot cracking susceptibility of fillers 52 and 82 in 800H and 825 nickel-base superalloys was discussed using the Spot Varestraint test. The fillers of 52 and 82 were added into nickel-base superalloys via a gas tungsten arc welding (GTAW).Experimental results showed that the hot cracking sensitivity of the nickel-base superalloys with filler at high temperature was lower than that without filler. The hot cracking sensitivity had a slight effect when the filler 82 was added. The total length of crack was increased, the liquid-solid (L-S) two-phase range is higher so that the hot cracking susceptibility will be raised. The morphologies of cracks included the intergranular crack in the molten pool, molten pool of solidification cracking, heat-affected zone of intergranular cracks, and transgranular crack in the heat-affected zone.

scholarly journals Properties of a thick-section narrow-gap gas tungsten arc weld of cast Haynes 282

2021 ◽  
Author(s):  
Michael Santella ◽  
X. Frank Chen ◽  
Philip Maziasz ◽  
Jason Rausch ◽  
Jonathan Salkin
Keyword(s):  
Base Metal ◽  
Heat Affected Zone ◽  
Reference Data ◽  
Filler Metal ◽  
Stress Rupture ◽  
Narrow Gap ◽  
Weld Deposit ◽  
Gas Tungsten Arc ◽  
Gas Tungsten ◽  
Weld Heat

AbstractA 50.8-mm-deep gas tungsten arc weld was made with matching filler metal in cast Haynes 282 alloy. The narrow-gap joint was filled with 104 weld beads. Visual and dye-penetrant inspection of cross-weld specimens indicated that the cast base metal contained numerous casting defects. No visible indications of physical defects were found in the weld deposit. The weld heat-affected zone was characterized by microcracking and localized recrystallization. The cause of the cracking could not be determined. Hardness testing showed that a softened region in the as-welded heat-affected zone was nearly eliminated by post-weld heat treatment. Tensile testing up to 816 °C showed that cross-weld specimen strengths ranged from 57 to 79% of the cast base metal tensile strength. The stress-rupture strengths of cross-weld specimens are within 20% of base metal reference data. Failures of both tensile and stress-rupture specimens occurred in the base metal.

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