Effect of post weld heat treatment on mechanical properties of pressure vessel steels

Калыанкар, В. Д.; Chudasama, Gautam

doi:10.1016/j.matpr.2018.10.265

Cited by 12 publications

(9 citation statements)

References 17 publications

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“…For pipeline steel-welded joints, post-weld heat treatment in the range of 100–200 °C below the A C1 temperature is used to reduce the residual stress of general steel according to the GB/T 16923-2008 “Normalizing and Annealing of Steel Parts” standard. Utilizing the heat input from adjacent weld passes and subsequent weld layers to provide tempering for the base or weld metals, namely, temper bead welding, was also used in situations where the PWHT was time consuming, expensive, or impractical [ 11 ]. Several researchers have proven that tempering performed between 500–650 °C could relieve residual tensile stress for general steel [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Post-Weld Heat Treatment on Microstructure and Fracture Toughness of X80 Pipeline Steel Welded Joint

Wang

Dai³

et al. 2022

Materials

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In the current study, post-weld heat treatment (PWHT 580 °C) was used for an X80 pipeline steel-welded joint, and the fracture toughness of the welded joint was investigated using a crack tip opening displacement (CTOD) test. The relationship between microstructure evolution and fracture toughness is also discussed in this study. The results showed that the weld center mainly consisted of acicular ferrite (AF). The subcritical heat-affected zone (SCHAZ) consisted of a large amount of fine polygonal ferrite and some AF, and it maintained the rolling state of the base metal. The microstructure of the coarse-grained heat-affected zone (CGHAZ) was composed of granular bainite (GB) and M/A constituents, the latter of which decreased after the PWHT. The CTOD values of the weld center were in the range of 0.18–0.27 mm, while those of the CGHAZ were in the range of 0.02–0.65 mm. A brittle fracture occurred in the CGHAZ for both the as-welded and PWHT samples; the CTOD values were 0.042 mm and 0.026 mm, respectively. The CTOD values of the SCHAZ’s location were in the range of 0.8–0.9 mm. The PWHT did not deteriorate the microstructure of the CGHAZ and had little influence on the fracture toughness of the X80 pipeline steel-welded joint; it ensured the fracture toughness of the welded joints and reduced the welding residual stress.

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Section: Introductionmentioning

confidence: 99%

Effect of Post-Weld Heat Treatment on Microstructure and Fracture Toughness of X80 Pipeline Steel Welded Joint

Wang

Dai³

et al. 2022

Materials

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“…Various constructional and technological methods can be used to reduce the adverse impact of welding stresses and deformations on the structure being produced. Currently, the most important methods of reducing welding distortion are [7][8][9][10][11][12][13][14][15][16][17][18]: pre-welding, in transient welding distortion, and post-welding distortion prevention method. As a rule, the pre-welding distortion prevention method uses properly designed welding guns.…”

Section: Introductionmentioning

confidence: 99%

Advanced Structural and Technological Method of Reducing Distortion in Thin-Walled Welded Structures

et al. 2021

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The article presents an innovative method of reducing welding distortions of thin-walled structures by introducing structural and technological changes. The accuracy of the method was demonstrated on the example of welding the stub pipes to the outer surface of a thin-walled tank with large dimensions, made of steel 1.4301 with a wall thickness of 1.5 × 10−3 (m). During traditional Gas Tungsten Arc Welding (GTAW), distortions of the base are formed, the flatness deviation of which was 11.9 × 10−3 (m) and exceeded the permissible standards. As a result of structural and technological changes, not only does the joint stiffness increase, but also a favorable stress state is introduced in the flange, which reduces the local welding stresses. Numerical models were developed using the finite element method (FEM), which were used to analyze the residual stresses and strains pre-welding, in extruded flanges, in transient, and post-welding. The results of the calculations for various flanges heights show that there is a limit height h = 9.2 × 10−3 (m), above which flange cracks during extrusion. A function for calculating the flange height was developed due to the required stress state. The results of numerical calculations were verified experimentally on a designed and built test stand for extrusion the flange. The results of experimental research confirmed the results of numerical simulations. For further tests, bases with a flange h = 6 × 10−3 (m) were used, to which a stub pipe was welded using the GTAW method. After the welding process, the distortion of the base was measured with the ATOS III scanner (GOM a Zeiss company, Oberkochen, Germany). It has been shown that the developed methodology is correct, and the introduced structural and technological changes result in a favorable reduction of welding stresses and a reduction in the flatness deviation of the base in the welded joint to 0.39 × 10−3 (m), which meets the requirements of the standards.

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“…In most cases on the weld tow surface, tensile residual stress occurs and hardness and microstructures change. There are methods of applying vibration to the structure [12][13][14], methods of mechanical loading [3,15,16], and PWHT [5,[17][18][19][20][21] to reduce the residual stress. Tomków and Janeczek [22] conducted an in-situ local heat treatment in underwater conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Pandey et al [32,33] showed that creep rupture life, crack initiation, and propagation characteristics of P91 weld joints depended very much on PWHT conditions. A review paper on heat treatment by Kalyankar and Chudassama [21], a review paper by Vöhringer [34] on the relaxation of residual stress by heat treatment and mechanical loading, and a review paper on the effect of residual stress on fatigue by McClung [11] are of great help to the overall understanding of the effect of PWHT and residual stress. In this study, the research material was medium-strength carbon steel (KS D 3515, SM355A) used in railway vehicles, automobiles, shipbuilding, etc.…”

Section: Introductionmentioning

confidence: 99%

Effect of Post-Weld Heat Treatment on the Fatigue Behavior of Medium-Strength Carbon Steel Weldments

Goo

2021

Metals

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Railway vehicle makers manufacture the bogie frame by welding medium-strength carbon steel sheets. It has been a long-standing practice to perform post-weld heat treatment (PWHT) to remove welding-residual stress, but rail car manufacturers are moving toward producing bogie frames without PWHT. Since securing the fatigue strength of the bogie frame is essential for vehicle operation safety, it is necessary to systematically evaluate the effects of PWHT on hardness, microstructure, mechanical properties, corrosion, fatigue strength, etc. In this study, small-scale welding specimens and full-size components were produced using S355JR used in general structures, automobiles, shipbuilding, railroad vehicles, etc. The effect of PWHT on material properties-the hardness of the base material, heat-affected zone and weld metal, microstructure, shock absorption energy, yield strength, tensile strength, and fatigue were investigated. When the weld specimen was annealed at 590 °C and 800 °C for 1 h, the yield strength and tensile strength of the specimen decreased, but the elongation increased. For specimens not heat-treated, the parent material’s yield strength, the yield strength in HAZ, and the yield strength of the weld metal were 350 MPa, 345 MPa, and 340 MPa. For specimens heat-treated at 590 °C, they were 350 MPa, 345 MPa, and 340 MPa. For specimens heat-treated at 800 °C, they were 350 MPa, 345 MPa, and 340 MPa. Annealing heat treatment of the specimen at 800 °C homogenized the structure of the weldments similar to that of the base material and slightly improved the shock absorption energy. For specimens not heat-treated, the Charpy impact absorption energies at 20 °C of the parent material and weld metal were 291.5 J and 187 J. For specimens heat-treated at 590 °C, they were 276 J and 166 J. For specimens heat-treated at 800 °C, the Charpy impact absorption energy at 20 °C of the parent material was 299 J. PWHT at 590 °C had the effect of slightly improving the fatigue limit of the specimen but lowered the fatigue limit by 10.8% for the component specimen.

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Effect of post weld heat treatment on mechanical properties of pressure vessel steels

Cited by 12 publications

References 17 publications

Effect of Post-Weld Heat Treatment on Microstructure and Fracture Toughness of X80 Pipeline Steel Welded Joint

Effect of Post-Weld Heat Treatment on Microstructure and Fracture Toughness of X80 Pipeline Steel Welded Joint

Advanced Structural and Technological Method of Reducing Distortion in Thin-Walled Welded Structures

Effect of Post-Weld Heat Treatment on the Fatigue Behavior of Medium-Strength Carbon Steel Weldments

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