Effects of heat input on microstructure and fracture toughness of simulated coarse-grained heat affected zone for HSLA steels

Yang, Xukun; Di, Xinjie; Liu, Xiuguo; Wang, Dongpo; Li, Chengning

doi:10.1016/j.matchar.2019.109818

Cited by 75 publications

(32 citation statements)

References 39 publications

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“…The main problems of high-strength steel welding include cold crack tendency, embrittlement, and softening in the heat-affected zone [ 5 , 6 ]. The heat-affected zone (HAZ) has a certain gradient distribution in the microstructure and performance and becomes the weakest part in the welding joint [ 7 ]. Especially, the coarse grain HAZ (CGHAZ), which is adjacent to the weld fusion line.…”

Section: Introductionmentioning

confidence: 99%

“…Cao et al [ 14 ], through the study of high-strength low-alloy steel, proposed a micro reaction mechanism that the impact toughness of coarse grain heat-affected zone decreases with the increase of welding heat input. Yang et al [ 7 ] reported on the effect of heat input on the microstructure and fracture toughness of the simulated CGHAZ of high-strength low-alloy steel. With the increase in heat input, the content of the martensite-austenite constituent (M-A constituent) increased.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Welding Peak Temperature on Microstructure and Impact Toughness of Heat-Affected Zone of Q690 High Strength Bridge Steel

et al. 2021

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The effect of peak temperature (TP) on the microstructure and impact toughness of the welding heat-affected zone (HAZ) of Q690 high-strength bridge steel was studied using a Gleeble-3500 thermal simulation testing machine. The results show that the microstructure of the inter critical heat-affected zone (ICHAZ) was ferrite and bainite. The microstructure of fine grain heat-affected zone (FGHAZ) and coarse grain heat-affected zone (CGHAZ) was lath bainite (LB) LB, lath martensite (LM), and granular bainite (GB), but the microstructure of FGHAZ was finer. With the increase in peak temperature, the content of LB and GB decreased, the content of LM increased, and the lath bundles of LM and LB gradually became coarser. With the increase in peak temperature, the grain size of the original austenite increased significantly, and the impact toughness decreased significantly. When the peak temperature was 800 °C, the toughness was the best. For CGHAZ, the peak temperature should be less than 1200 °C to avoid excessive growth of grain and reduction of mechanical property.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Welding Peak Temperature on Microstructure and Impact Toughness of Heat-Affected Zone of Q690 High Strength Bridge Steel

et al. 2021

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“…9). According to the literature [34][35][36], the increase in heat input changes the M-A-C morphology from slender to massive owing to the decrease in the cooling rate. Figures 8 and 9 show that the IT increase decreased the cooling rate, creating the necessary thermodynamic conditions for the formation of a massive instead of slender M-A-C.…”

Section: Microstructural Characterizationmentioning

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

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.

show abstract

Section: Microstructural Characterizationmentioning

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

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.

show abstract

Effects of heat input on microstructure and fracture toughness of simulated coarse-grained heat affected zone for HSLA steels

Cited by 75 publications

References 39 publications

Effect of Welding Peak Temperature on Microstructure and Impact Toughness of Heat-Affected Zone of Q690 High Strength Bridge Steel

Effect of Welding Peak Temperature on Microstructure and Impact Toughness of Heat-Affected Zone of Q690 High Strength Bridge Steel

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

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