Effect of heat treatment outside the furnace on relaxation of welding stresses and the properties of welded joints in large pressure vessels

1991 ◽  
Vol 5 (5) ◽  
pp. 399-401
Author(s):  
P M Korol'kov ◽  
N M Kabanov
Keyword(s):  
Heat Treatment ◽  
Welded Joints ◽  
Pressure Vessels ◽  
Large Pressure

Evaluation of Fracture Toughness for P355NH Steel Subjected to Thermal Cycles Simulation

2015 ◽  
Vol 1111 ◽  
pp. 193-198
Author(s):  
Sergiu Valentin Galaţanu ◽  
Doru Romulus Pascu ◽  
Nicolae Faur
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Welded Joints ◽  
Thermal Cycle ◽  
Pressure Vessels ◽  
Thermal Cycles ◽  
Butt Welding ◽  
Cycle Simulation ◽  
Complex Equipment ◽  
The Impact

The thermal cycles simulator of welding is a complex equipment that reproduces in a specimen thermal cycles of the type caused in the HAZ by welding processes.In this paper, it is presented a comparison between the results obtained by welded joints and thermal cycle simulator specimens, from the material P355NH of 22 mm thickness for pressure vessels. Two types of thermal cycle simulator specimens were used: one specimen without post-simulation heat treatment and one specimen with post-simulation heat treatment.For the welded specimens Mn3Ni1CrMo filler material was used.This paper offers information about the impact energy of specific areas of the welded joints, both for butt welding and thermal cycle simulator specimens.A good correlation was observed between the results of thermal cycle simulation with post-simulation heat treatment and the results obtained by welding.

scholarly journals Coalesced Martensite in Pressure Vessel Steels

2013 ◽  
Author(s):  
Hector Pous-Romero ◽  
Harry Bhadeshia
Keyword(s):  
Heat Treatment ◽  
Experimental Work ◽  
Pressure Vessel ◽  
Pressure Vessels ◽  
Water Quenching ◽  
Large Pressure ◽  
Pressure Vessel Steels ◽  
Two Phases

An alloy commonly used for large pressure vessels, known as SA508 Gr. 3, has a microstructure after heat treatment consisting of a mixture of tempered bainite and martensite at fast cooled regions near surfaces subject to water quenching. These two phases are conventionally recognised to consist of fine platelets, each of which is approximately 0.2 μm in thickness; enhancing strength and leading to good toughness properties. We have discovered in our experimental work that there are circumstances where the adjacent platelets of a similar orientation can coalesce as the austenite transforms, to produce much coarser structures which are believed to be detrimental to toughness. An examination of published micrographs reveals that such coalesced regions existed but were not noticed in previous studies. The mechanism of coalescence is described and methods to ameliorate the coarsening are discussed.

scholarly journals Coalesced Martensite in Pressure Vessel Steels

2014 ◽  
Vol 136 (3) ◽  
Author(s):  
Hector Pous-Romero ◽  
Harry Bhadeshia
Keyword(s):  
Heat Treatment ◽  
Experimental Work ◽  
Pressure Vessel ◽  
Pressure Vessels ◽  
Water Quenching ◽  
Large Pressure ◽  
Pressure Vessel Steels ◽  
Two Phases ◽  
Grade 3

An alloy commonly used for large pressure vessels, known as SA508 Grade 3, has a microstructure after heat treatment consisting of a mixture of tempered bainite and martensite at fast cooled regions near surfaces subject to water quenching. These two phases are conventionally recognized to consist of fine platelets, each of which is approximately 0.2 μm in thickness, enhancing strength and leading to good toughness properties. We have discovered in our experimental work that there are circumstances where the adjacent platelets of a similar orientation can coalesce as the austenite transforms, to produce much coarser structures which are believed to be detrimental to toughness. An examination of published micrographs reveals that such coalesced regions existed but were not noticed in previous studies. The mechanism of coalescence is described and methods to ameliorate the coarsening are discussed.

Effect of Heat Treatment on the Microstructure and Microchemistry of Explosive Welded Joints of Ti-5Ta-1.8Nb and 304L SS

2011 ◽  
Vol 44 (4) ◽  
pp. 53
Author(s):  
C. Sudha ◽  
T. N. Prasanthi ◽  
S. Saroja ◽  
M. Vijayalakshmi
Keyword(s):  
Heat Treatment ◽  
Welded Joints
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