Effects of Multiple Post Weld Heat Treatments on Microstructure and Precipitate of Fine Grained Heat Affected Zone of P91 Weld

2019 ◽  
Vol 90 (7) ◽  
pp. 1800607
Author(s):  
Yu Wang ◽  
Wanjun He ◽  
Qunfeng Zeng ◽  
Jianing Zhu
Keyword(s):  
Heat Affected Zone ◽  
Heat Treatments ◽  
Fine Grained ◽  
Weld Heat

scholarly journals Controlling of the Softened Region in Weld Heat Affected Zone of Ultra Fine Grained Steels

2000 ◽  
Vol 40 (Suppl) ◽  
pp. S29-S33 ◽  
Author(s):  
Reisuke Ito ◽  
Chiaki Shiga ◽  
Yoshiaki Kawaguchi ◽  
Terumi Nakamura ◽  
Kazuo Hiraoka ◽  
...  
Keyword(s):  
Heat Affected Zone ◽  
Fine Grained ◽  
Fine Grained Steels ◽  
Weld Heat

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.

Minimization of Heat-Affected Zone Size in Welded Ultra-Fine Grained Steel under Cooling by Liquid Nitrogen during Laser Welding

2007 ◽  
Vol 539-543 ◽  
pp. 4063-4068 ◽  
Author(s):  
Hideki Hamatani ◽  
Yasunobu Miyazaki ◽  
Tadayuki Otani ◽  
Shigeru Ohkita
Keyword(s):  
Laser Welding ◽  
Liquid Nitrogen ◽  
Heat Affected Zone ◽  
Laser System ◽  
Heat Removal ◽  
Plate Temperature ◽  
Fine Grained ◽  
Laser Beam Irradiation ◽  
Average Grain Size ◽  
Plume Temperature

Ultra-fine grained steel (UFGS) with an average grain size of less than 1μm has been developed and is expected to demonstrate superior properties. However, its welded heat-affected zone, HAZ, substantially affecting the strength of a welded joint, will be easily softened after welding. Therefore, minimization of UFGS’s HAZ size during laser welding was carried out using the cooling conductor liquid nitrogen. It was found that a shielding gas with adequate flow rate for the liquid nitrogen depth was used to displace nitrogen on the area of laser beam irradiation to stabilize the weld bead. Also, because YAG laser system was mainly used because it has a lower laser induced plasma or plume temperature, which results in a decreased occurrence of pit and blowhole. HAZ size minimization strongly depends on the initial plate temperature. Reduced initial plate temperature shrinks the specific heated temperature range in which softening occurs. However, due possibly to decreasing thermal conductivity under room temperature, which prevents heat removal, the benefit of reducing the initial plate temperature is limited. The optimal initial temperature to minimize the HAZ size, in the present work, was found to be 123K.

Statistical model of cleavage fracture in granular bainite in simulated weld heat affected zone

1989 ◽  
Vol 5 (9) ◽  
pp. 913-917 ◽  
Author(s):  
X. X. Xu ◽  
Q. G. Cai ◽  
Y. Su ◽  
C. X. Hou ◽  
W. D. Ma
Keyword(s):  
Statistical Model ◽  
Cleavage Fracture ◽  
Heat Affected Zone ◽  
Granular Bainite ◽  
Weld Heat
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