A Method for Developing Postweld Heat Treatments and Evaluating Effects of Residual Elements on Heat-Affected Zone Tempering Resistance

2008 ◽  
pp. 261-261-5
Author(s):  
RH Biron ◽  
CH Kreischer ◽  
AS Melilli
Keyword(s):  
Heat Affected Zone ◽  
Heat Treatments ◽  
Residual Elements ◽  
Postweld Heat ◽  
Tempering Resistance

Cause and Prevention of Stress-Relief Cracking in Quenched and Tempered Steel Weldments

1972 ◽  
Vol 94 (1) ◽  
pp. 336-341 ◽  
Author(s):  
C. F. Meitzner
Keyword(s):  
High Temperature ◽  
Heat Affected Zone ◽  
Elevated Temperatures ◽  
Stress Relief ◽  
Heat Treatments ◽  
Intergranular Cracking ◽  
Quenched And Tempered Steel ◽  
Postweld Heat ◽  
Tempered Steel

The paper reviews the causes and characteristics of stress-relief cracking, i.e., intergranular cracking in the heat-affected zone that occurs during the exposure of welded assemblies to the elevated temperatures produced by postweld heat treatments or high-temperature service. The findings presented are based largely on work at the Homer Research Laboratories with quenched and tempered steels. Means for preventing cracking during fabrication and service are discussed.

Effect of Local Postweld Heat Treatments on Metal Inert Gas-Welded A7N01S-T5 Joints

2019 ◽  
Vol 28 (6) ◽  
pp. 3622-3629
Author(s):  
Pengcheng Zhao ◽  
Honglei Tang ◽  
Sen Lin ◽  
Lulu Wang ◽  
Jiajing Pan
Keyword(s):  
Heat Treatments ◽  
Inert Gas ◽  
Postweld Heat

Numerical Simulation of CrMo Steels Thick Welds Intermediate Postweld Heat Treatments

2005 ◽  
Author(s):  
Maryline Clerge´ ◽  
Christian Boucher ◽  
Sylvain Pillot ◽  
Philippe Bourges
Keyword(s):  
Heat Treatment ◽  
Complex Shape ◽  
Heat Treatments ◽  
Pressure Vessels ◽  
Post Weld Heat Treatment ◽  
Treatment Conditions ◽  
Stress Relieving ◽  
Creep Resistant Steels ◽  
Postweld Heat ◽  
Hydrogenation Treatment

During manufacturing, complex shape welded pressure vessels are submitted to numerous intermediate heat treatments after each weld (de-hydrogenation treatment - DHT and/or intermediate stress relieving treatment - ISR) before final Post Weld Heat Treatment (PWHT). The present study aims at analysing and optimising the intermediate heat treatment conditions regarding the resulting mechanical properties (tensile strength and impact. strength) of CrMo and CrMoV creep resistant steels. Hydrogen behaviour in weld metal and HAZ, and residual stresses evolution have been assessed by numerical modelling and experimental measurements on welded specimens representative of big pressure vessels: butt welds and set in nozzle welds of 150 mm wall thickness. The optimised conditions are compared to usual construction codes and buyer’s requirements.

A Study of Temper Bead Technique on A508 Steel Welds

2011 ◽  
Vol 295-297 ◽  
pp. 1938-1942
Author(s):  
Wei Chih Chung ◽  
Leu Wen Tsay ◽  
Chun Chen
Keyword(s):  
Heat Treatment ◽  
Heat Affected Zone ◽  
Filler Metal ◽  
Welding Process ◽  
Postweld Heat Treatment ◽  
Weld Interface ◽  
Structural Components ◽  
Time Saving ◽  
Steel Welds ◽  
Postweld Heat

The use of temper bead technique in an attempt to eliminate the conventional postweld heat treatment (PWHT) in welding of A508 steel with Alloy 52 filler metal was evaluated. A PWHT at 621°C for 24 h reduced hardness in the heat-affected zone (HAZ) of the conventional welds but led to forming a carbon-denuded zone near the weld interface. The temper bead welding process not only softened the hardness in the HAZ but also diminished the carbon-denuded zone of A508-Alloy 52 welds. Apparently, the temper bead technique provides a convenient and time- saving process for welding/repairing large structural components.

scholarly journals Heat-Affected-Zone Liquation Cracking in Welded Cast Haynes® 282®

Metals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 29 ◽  
Author(s):  
Sukhdeep Singh ◽  
Joel Andersson
Keyword(s):  
Heat Treatment ◽  
Heat Affected Zone ◽  
Heat Treatments ◽  
Treatment Temperature ◽  
Mass Spectrometry Analysis ◽  
Liquation Cracking ◽  
Spectrometry Analysis ◽  
Thermomechanical Simulation ◽  
Common Understanding ◽  
Zone Liquation

Varestraint weldability testing and Gleeble thermomechanical simulation of the newly developed cast form of Haynes® 282® were performed to understand how heat-affected-zone (HAZ) liquation cracking is influenced by different preweld heat treatments. In contrast to common understanding, cracking susceptibility did not improve with a higher degree of homogenization achieved at a higher heat-treatment temperature. Heat treatments with a 4 h dwell time at 1120 °C and 1160 °C exhibited low cracking sensitivity, whereas by increasing the temperature to 1190 °C, the cracking was exacerbated. Nanosecond ion mass spectrometry analysis was done to characterize B segregation at grain boundaries that the 1190 °C heat treatment indicated to be liberated from the dissolution of C–B rich precipitates.

scholarly journals Effect of Postweld Heat Treatments on Type IV Creep Failure in the Intercritical Heat-Affected Zone of 10% Cr Martensitic Steel Welded with Haynes 282 Filler

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 726
Author(s):  
Namkyu Kim ◽  
Yongjoon Kang ◽  
Jinhyeok Bang ◽  
Sangwoo Song ◽  
Seong-Moon Seo ◽  
...  
Keyword(s):  
Heat Affected Zone ◽  
Welded Joints ◽  
Martensitic Steel ◽  
Laves Phase ◽  
Lower Amount ◽  
Failure Behavior ◽  
Creep Life ◽  
Creep Failure ◽  
Type Iv ◽  
Postweld Heat

This study investigated the effect of postweld heat treatment (PWHT) conditions on Type IV failure behavior of 10% Cr martensitic steel welds using Haynes 282 filler. The welded joints were subjected to PWHT at temperatures of 688, 738, and 788 °C for 4 and 8 h. Creep tests were carried out at 600 °C under a stress of 200 MPa. The as-welded joint without PWHT showed Type IV cracking due to growth of voids around Laves phase by localized creep deformation in the intercritical heat-affected zone (ICHAZ). The creep properties of the PWHTed joints at 688 °C were similar to those of the as-welded joints without PWHT. On the other hand, the PWHTed joints at 738 °C exhibited a significantly longer creep life by a lower amount of Laves phase in the ICHAZ than those at 688 °C; this could be a result of the homogenization of ICHAZ microstructure during PWHT at 738 °C. However, the PWHT at 688 and 738 °C showed the same Type IV creep failure mode. Meanwhile, the PWHTed joints at 788 °C exhibited the shortest creep life in this study. The failure location was shifted to the base metal away from the HAZ, and severe plastic deformation occurred due to the softened matrix by excessive tempering.

Strain-Age Cracking after Postweld Heat Treatments in Inconel 738 Superalloy

2010 ◽  
Vol 29 (1-2) ◽  
pp. 61-68 ◽  
Author(s):  
Seksak Asavavisithchai, ◽  
Weerasak Homkrajai, ◽  
Panyawat Wangyao,
Keyword(s):  
Heat Treatments ◽  
Postweld Heat

Disbonding of type 347 weld overlays induced by postweld heat treatments and hydrogen charge

1989 ◽  
Vol 7 (1) ◽  
pp. 35-47 ◽  
Author(s):  
M. De Sanctis ◽  
L. Paganini ◽  
A. Solina ◽  
R. Valentini
Keyword(s):  
Hydrogen Charge ◽  
Heat Treatments ◽  
Postweld Heat ◽  
Weld Overlays
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