FEM-thermodynamic simulation methodology to predict the influence of t8/5 on the coarse grain heat-affected zone of a Cr-Mo low-alloy steel pipe

Dornelas, Paulo Henrique Grossi; Filho, João da Cruz Payão; Farias, Francisco Werley Cipriano; Oliveira, Victor Hugo Pereira Moraes e; Moraes, Diogo de Oliveira; Júnior, Petrônio Zumpano

doi:10.1016/j.jmapro.2020.10.082

Cited by 20 publications

(16 citation statements)

References 40 publications

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“…The welding simulation was validated by comparing the simulated welding thermal cycles (Sysweld®) in the last four weld passes with the actual thermal cycles measured with thermocouples; both were obtained from the base metal 25 mm away from the joint groove. A similar validation procedure is speci ed in ISO 18166, which has been used by other authors in the literature [4,12,31]. Figure 6 shows the excellent correlation between the simulated and measured welding thermal cycles.…”

Section: Fem Model and Its Validationmentioning

confidence: 87%

“…Shi and Han [11] reported a drop in the HAZ toughness owing to the amount of martensite-austenite (M-A) constituents formed at lower cooling rates. Dornelas et al [12] observed that the increase in the IT signi cantly changed in the microstructure, and consequently decreased the CGHAZ hardness and fracture toughness of a Cr-Mo low-alloy steel. On the other hand, Wang et al [13] reported an improvement in the HAZ toughness due to an increase in IT between 80°C and 130°C; however, a drop was observed when the IT increased beyond 130°C.…”

Section: Introductionmentioning

confidence: 99%

“…In this case, computer simulations of the welding process and thermodynamic simulations can be used to predict the HAZ thermal cycles and microstructures under different welding conditions (e.g., IT); this speed up the analysis and makes it less expensive. Computer simulations of welding ( nite element method, FEM) [14][15][16][17][18] and thermodynamics (Calphad method) [12,[19][20] have developed in recent years.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Interpass Temperature on Simulated Heat-Affected Zone of Gas Metal Arc Welded API 5L X70 Pipe Joint

Dornelas

Filho

Oliveira

et al. 2021

Preprint

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Welding costs associated with the laying of pipes for deepwater oil and gas extraction can be reduced using high interpass temperatures (ITs). However, a high IT can decrease the mechanical properties of the heat-affected zone (HAZ) of welded joints. With the use of high strength-toughness stees, this decrease may be an acceptable trade-off. Therefore, it is necessary to evaluate the influence of high ITs on the HAZ. The influence of the IT on the coarse grain HAZ (CGHAZ) and intercritically reheated coarse-grain HAZ (ICCGHAZ) of an API 5L X70 pipe joint welded by gas metal arc welding was investigated. The welding was numerically simulated using finite element method software. The microstructure of the HAZ was predicted using thermodynamic simulation software. The CGHAZ and ICCGHAZ were also physically simulated and evaluated via optical microscopy and scanning electron microscopy, dilatometry, and Vickers microhardness and Charpy V-notch (CVN) impact tests. The increase in IT led to a decrease in CGHAZ microhardness, but did not affect the ICCGHAZ. The CVN energies obtained for all ITs (CGHAZ and ICCGHAZ) were higher than that set by the DNVGL-ST-F101 standard (50 J). These results show that increasing the IT is an interesting and effective method to reduce welding costs. In addition, thermodynamic simulation proved to be a valid method for predicting the phases in the HAZ of API 5L X70 pipe welded joints.

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Section: Fem Model and Its Validationmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of the Interpass Temperature on Simulated Heat-Affected Zone of Gas Metal Arc Welded API 5L X70 Pipe Joint

Dornelas

Filho

Oliveira

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…Shi and Han [11] reported a drop in the HAZ toughness owing to the amount of martensite-austenite (M-A) constituents formed at lower cooling rates. Dornelas et al [12] observed that the increase in the IT significantly changed in the microstructure and consequently decreased the CGHAZ hardness and fracture toughness of a Cr-Mo low-alloy steel. On the other hand, Wang et al [13] reported an improvement in the HAZ toughness due to an increase in IT between 80 °C and 130 °C; however, a drop was observed when the IT increased beyond 130 °C.…”

Section: Introductionmentioning

confidence: 99%

“…In this case, computer simulations of the welding process and thermodynamic simulations can be used to predict the HAZ thermal cycles and microstructures under different welding conditions (e.g., IT); this speeds up the analysis and makes it less expensive. Computer simulations of welding (finite element method, FEM) [14][15][16][17][18] and thermodynamics (Calphad method) [12,19,20] have developed in recent years.…”

Section: Introductionmentioning

confidence: 99%

Effect of the interpass temperature on simulated heat-affected zone of gas metal arc welded API 5L X70 pipe joint

Dornelas

Filho

Oliveira

et al. 2021

Int J Adv Manuf Technol

Self Cite

View full text Add to dashboard Cite

Welding costs associated with the laying of pipes for deepwater oil and gas extraction can be reduced using high interpass temperatures (ITs). However, a high IT can decrease the mechanical properties of the heat-affected zone (HAZ) of welded joints. With the use of high strength-toughness steels, this decrease may be an acceptable trade-off. Therefore, it is necessary to evaluate the influence of high ITs on the HAZ. The influence of the IT on the coarse-grain HAZ (CGHAZ) and intercritically reheated coarse-grain HAZ (ICCGHAZ) of an API 5L X70 pipe joint welded by gas metal arc welding was investigated. The welding was numerically simulated using finite element method software. The microstructure of the HAZ was predicted using thermodynamic simulation software. The CGHAZ and ICCGHAZ were also physically simulated and evaluated via optical microscopy and scanning electron microscopy, dilatometry, and Vickers microhardness and Charpy V-notch (CVN) impact tests. The increase in IT led to a decrease in CGHAZ microhardness but did not affect the ICCGHAZ. The CVN energies obtained for all ITs (CGHAZ and ICCGHAZ) were higher than that set by the DNVGL-ST-F101 standard (50 J). These results show that increasing the IT is an interesting and effective method to reduce welding costs. In addition, thermodynamic simulation proved to be a valid method for predicting the phases in the HAZ of API 5L X70 pipe welded joints.

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Microstructure and impact toughness of high strength steel weld metals deposited by MCAW-RE process using different shielding gases

Filho

Silveira

Costa

et al. 2021

Int J Adv Manuf Technol

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FEM-thermodynamic simulation methodology to predict the influence of t8/5 on the coarse grain heat-affected zone of a Cr-Mo low-alloy steel pipe

Cited by 20 publications

References 40 publications

Effect of the Interpass Temperature on Simulated Heat-Affected Zone of Gas Metal Arc Welded API 5L X70 Pipe Joint

Effect of the Interpass Temperature on Simulated Heat-Affected Zone of Gas Metal Arc Welded API 5L X70 Pipe Joint

Effect of the interpass temperature on simulated heat-affected zone of gas metal arc welded API 5L X70 pipe joint

Microstructure and impact toughness of high strength steel weld metals deposited by MCAW-RE process using different shielding gases

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