Effect of Pre- and Post Weld Heat Treatment on Microstructure Development and Mechanical Properties of 0.3%C-CrMoV (ESR) High-Strength Low-Alloy Steel

2021 ◽  
Author(s):  
P. Ramkumar ◽  
R. K. Gupta ◽  
V. Anil Kumar ◽  
V. Muthupandi
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Alloy Steel ◽  
High Strength ◽  
Post Weld Heat Treatment ◽  
Microstructure Development ◽  
Low Alloy Steel ◽  
Weld Heat

Effects of Post-Weld Heat Treatment on the Microstructure and Toughness of Flash Butt Welded High-Strength Low-Alloy Steel

2018 ◽  
Vol 49 (4) ◽  
pp. 1276-1286 ◽  
Author(s):  
Nikhil Shajan ◽  
Kanwer Singh Arora ◽  
Brajesh Asati ◽  
Vikram Sharma ◽  
Mahadev Shome
Keyword(s):  
Heat Treatment ◽  
Alloy Steel ◽  
High Strength ◽  
Post Weld Heat Treatment ◽  
Low Alloy Steel ◽  
Weld Heat

Alternative Approach for Qualification of Temperbead Welding in the Nuclear Industry

2012 ◽  
Author(s):  
Steven L. McCracken ◽  
Richard E. Smith
Keyword(s):  
Heat Treatment ◽  
Fracture Toughness ◽  
Alloy Steel ◽  
Nuclear Power ◽  
Post Weld Heat Treatment ◽  
Nuclear Power Industry ◽  
Low Alloy Steels ◽  
Low Alloy Steel ◽  
Alloy Steels ◽  
Weld Heat

Temperbead welding is common practice in the nuclear power industry for in-situ repair of quenched and tempered low alloy steels where post weld heat treatment is impractical. The temperbead process controls the heat input such that the weld heat-affected-zone (HAZ) in the low alloy steel is tempered by the welding heat of subsequent layers. This tempering eliminates the need for post weld heat treatment (PWHT). Unfortunately, repair organizations in the nuclear power industry are experiencing difficulty when attempting to qualify temperbead welding procedures on new quenched and tempered low alloy steel base materials manufactured to modern melting and deoxidation practices. The current ASME Code methodology and protocol for verification of adequate fracture toughness in materials was developed in the early 1970s. This paper reviews typical temperbead qualification results for vintage heats of quenched and tempered low alloy steels and compares them to similar test results obtained with modern materials of the same specification exhibiting superior fracture toughness.

scholarly journals Post-Weld Heat Treatment of API 5L X70 High Strength Low Alloy Steel Welds

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5801
Author(s):  
Houman Alipooramirabad ◽  
Anna Paradowska ◽  
Shahrooz Nafisi ◽  
Mark Reid ◽  
Reza Ghomashchi
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Residual Stresses ◽  
Arc Welding ◽  
High Strength ◽  
Post Weld Heat Treatment ◽  
Slight Reduction ◽  
Weld Joints ◽  
Flux Cored Arc Welding ◽  
Weld Heat

High Strength Low Alloy (HSLA) steels are the materials of choice in pipeline construction with the API X70 grade as the steel for the majority of pipeline networks constructed during the late 20th and early this century. This paper reports on the influence of Post-Weld Heat Treatment (PWHT) on the reduction of residual stresses, resulting changes in the microstructure, and mechanical properties of a multi-pass, X70 HSLA steel, weld joints made by a combined Modified Short Arc Welding (MSAW) and Flux Cored Arc Welding (FCAW) processes. Neutron diffraction results highlighted high magnitude of tensile residual stresses, in excess of yield strength of both parent and weld metal, in the as-welded specimen (~650 MPa), which were decreased substantially as a result of applying PWHT (~144 MPa). Detailed microstructural studies are reported to confirm the phase transformation during PWHT and its interrelationship with mechanical properties. Transmission Electron Microscopy (TEM) analysis showed polygonization and formation of sub-grains in the PWHT specimen which justifies the reduction of residual stress in the heat-treated weld joints. Furthermore, microstructural changes due to PWHT justify the improvement in ductility (increase in the elongations) with a slight reduction in yield and tensile strength for the PWHT weld joint.

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