The effects of multiple repair welds on a quenched and tempered steel for naval vessels

Carpenter, Kristin R; Dissanayaka, Pragathi; Sterjovski, Zoran; Li, Huijun; Donato, José Varela; Gazder, Azdiar A.; Duin, Stephen van; Miller, D. G.; Johansson, Mikael

doi:10.1007/s40194-021-01150-y

Cited by 6 publications

(4 citation statements)

References 28 publications

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“…e texture concentration density of the HAZ in the 1R specimen is 4.39, which is only one third of the 0R specimen, and the texture randomness is stronger. Higher texture randomness will lead to more obstacles to slip and improve the toughness of materials [17][18][19][20]. ere is still no obvious texture orientation in the HAZ in the 2R specimen, and the texture concentration density is also reduced to 3.51. is phenomenon occurs mainly because the repair welding area is re-liquefied and re-solidified during the repair welding process.…”

Section: Resultsmentioning

confidence: 99%

“…However, there have been relevant studies on the influence of multiple repair welding on the microstructure and properties of welded joints. Carpenter et al [10] investigated the effect of multiple repair welding procedures on quenched and tempered steel for naval vessels. e findings showed that, compared to the original toughness, the application of multiple repeat welds or the multiple simulation of the same sub-HAZ thermal cycle did neither deteriorate toughness nor noticeably altered the final microstructure.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Repeated Weld Repairs on Microstructure and Mechanical Properties of Heat-Affected Zone in CA6NM Stainless Steel

Liu

Fang

et al. 2022

Advances in Materials Science and Engineering

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The low-carbon martensitic stainless steel CA6NM is widely used in the impellers of hydroelectric and nuclear power units due to its advantages of high hardness, corrosion fatigue strength, and good fracture toughness. In order to analyze the number of repair welding times on the properties of heat-affected zone (HAZ, the most unstable area of welded joint property) in CA6NM, the microstructure and mechanical properties of HAZ with once-repaired welds (1R) and twice-repaired welds (2R) were tested. Through data analysis, the following conclusions are drawn for welded joints: (1) the grain size of HAZ with a different number of repair welding processes is smaller than that of the base material; (2) the density of texture concentration is reduced and the directionality is not obvious; (3) the density of twins and dislocations are increased; (4) the hardness and impact energy of HAZ of the 1R and 2R specimens are higher than that of the base material.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Repeated Weld Repairs on Microstructure and Mechanical Properties of Heat-Affected Zone in CA6NM Stainless Steel

Liu

Fang

et al. 2022

Advances in Materials Science and Engineering

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“…Offshore steel structures in marine environment face a high degree of damage due to dynamic environmental and operational factors such as corrosion, fatigue cracking, or cold cracking [16,18,21,22]. Many repairs have to be performed in the water environment [23]. Underwater repair processes have been described for mild steels and high-strength lowalloy steels [7,11,20].…”

Section: Introductionmentioning

confidence: 99%

Application Possibilities of the S960 Steel in Underwater Welded Structures

2022

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In this paper, the application possibilities of the ultra-high strength (UHSS) Domex 960 steel in the underwater welded structures are analyzed. In the research, the investigated material has been tested in bead-on-plate wet welding conditions with the usage of different heat input values, namely 0.63 kJ/mm, 0.72 kJ/mm and 0.93 kJ/mm. Specimens were performed by the manual metal arc (MMA) welding method with the usage of rutile covered electrodes. Firstly, the nondestructive visual testing (VT) was carried out. In the next step, the metallographic macro- and microscopic tests were performed. Finally, the hardness of the weld metal and heat-affected zone (HAZ) was measured by the Vickers HV10 method. The performed experiments allow the statement that the Domex 960 steel could be welded in a water environment. It also showed that increasing heat input leads to decreasing the hardness in HAZ by 30 HV10. It may result in decreasing the susceptibility to cold cracking during butt- and filet welding in the water environment.

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“…Zhang pointed out that abnormal grain coarsening occurred during solution treatment of the repair joint in the research of post-weld heat treatment of GTAW repair weld joint of sand casting Mg-Y-RE-Zr alloy [20]. Carpenter K. R. et al performed multiple weld repairs and Gleeble heat-affected zone simulations to describe the effects of repeated thermal cycles on the microstructure and toughness of different heat affected zone [21]. At present, there is no specific research on the properties of ZG06Cr13Ni4Mo martensitic stainless steel after several repair welding and the microstructure transformation in the repair welded joints.…”

Section: Introductionmentioning

confidence: 99%

Effect of Reversed Austenite on Mechanical Properties of ZG06Cr13Ni4Mo Repair Welded Joint

Wei

Li³

et al. 2021

Coatings

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In this work, gas tungsten arc welding (GTAW) was used to repair ZG06Cr13Ni4Mo martensitic stainless steel. Repair welding occurred either once or twice. The changes in the microstructure and properties of the repair welded joints were characterized by optical microscope (OM), scanning electron microscope (SEM), electron backscattering diffraction (EBSD), tensile and impact tests. The effects of reversed austenite in repair welded joints on microstructure and mechanical properties were studied. The results show that the microstructure of the welded joint after repair welding consists of a large amount of martensite (M) and a small amount of reversed austenite (A), and the reversed austenite is distributed at the boundary of martensite lath in fine strips. With the increase in the number of welding repairs, the content of reversed austenite in the welded joint increases. The microstructure in the repair welded joints is gradually refined, the microstructure in the once and twice repaired joints is 45.2% and 65.1% finer than that in the casting base metal, respectively. The reversed austenite presented in the repair welded joints decreases the tensile strength by 4.8% and 6.7%, increases the yield strength by 21.3% and 26.4%, and increases the elongation by 25% and 56%, respectively, compared with the casting base metal. In addition, the reversed austenite mainly nucleates and grows at the boundary of lath martensite. The refinement of the martensite structure was due to the generation of reversed austenite and the refinement of original austenite grain by the welding thermal cycle. After repair welding, the reverse austenite appeared in the repair welded joints and the tensile strength decreased slightly, but the plastic toughness was significantly improved, which was conducive to the subsequent service process.

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The effects of multiple repair welds on a quenched and tempered steel for naval vessels

Cited by 6 publications

References 28 publications

Effect of Repeated Weld Repairs on Microstructure and Mechanical Properties of Heat-Affected Zone in CA6NM Stainless Steel

Effect of Repeated Weld Repairs on Microstructure and Mechanical Properties of Heat-Affected Zone in CA6NM Stainless Steel

Application Possibilities of the S960 Steel in Underwater Welded Structures

Effect of Reversed Austenite on Mechanical Properties of ZG06Cr13Ni4Mo Repair Welded Joint

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