The evolution of microstructure and intergranular corrosion resistance of duplex stainless steel joint in multi-pass welding

Zhang, Yiqi; Cheng, Shanghua; Wu, Shaojie; Cheng, Fangjie

doi:10.1016/j.jmatprotec.2019.116471

Cited by 30 publications

(12 citation statements)

References 13 publications

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“…The formation of crystal defects (faults) not only reduces the strength of welded joins, but also becomes the initial points of corrosion, whichpromotes the occurrence of pitting corrosion [35][36][37]. This is the reason why the corrosion resistance of No.1 sample is the worst in both the pitting corrosion test and the intergranular corrosion test.…”

Section: Discussionmentioning

confidence: 99%

Influence of Shielding Gas on Microstructure and Properties of GMAW DSS2205 Welded Joints

et al. 2021

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In the present study, the microstructures and properties of DSS 2205 solid wire MIG welded samples prepared in different shielding gases (pure Ar gas, 98%Ar + 2%O2 and 98%Ar + 2%N2) were investigated for improving the weldability of DSS 2205 welded joint. The work was conducted by mechanical property tests (hardness and tensile test) and corrosion resistance property tests (immersion and electrochemical tests). The results show that adding 2%O2 into pure Ar gas as the shielding gas decreases crystal defects (faults) and improves the mechanical properties and corrosion resistance of the welded joints. Phase equilibrium and microstructural homogeneity in welded seam (WS) and heat-affected zone (HAZ) can be adjusted and the strength and corrosion resistance of welded joints increased obviously by adding 2%N2 to pure Ar gas as the shielding gas. Compared with DSS 2205 solid wire MIG welding in 98%Ar + 2%O2 mixed atmosphere, the strength and corrosion resistance of welded joints are improved more obviously in 98%Ar + 2%N2 mixed atmosphere.

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Section: Discussionmentioning

confidence: 99%

Influence of Shielding Gas on Microstructure and Properties of GMAW DSS2205 Welded Joints

et al. 2021

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“…The new 12Cr1MoV steel requires normalizing with tempering heat treatment. The normal original organization of the new 12Cr1MoV steel is ferrite plus partial bainite or pearlite [10]. In the normal original organization of 12Cr1MoV steel, ferrite and pearlite should be uniformly distributed.…”

Section: Metallographic Analysismentioning

confidence: 99%

“…bainite or pearlite [10]. In the normal original organization of 12Cr1MoV steel, ferrite and pearlite should be uniformly distributed.…”

Section: Metallographic Analysismentioning

confidence: 99%

“…There should be no bias in the composition of the steel, and there should be no carburization or metal inclusions that could harm the organization. A new 12Cr1MoV metallographic cluster was analyzed using the area method to calculate the ferrite area fraction of the polished surface of the metallographic, 55-67%, the pearlite area fraction of 30-42%, and the original carbide and non-metallic inclusions area fraction of 3-4.7% [10]. Figure 2 shows the metallographic organization of Sample 2.…”

Section: Metallographic Analysismentioning

confidence: 99%

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Influence of 12Cr1MoV Material on Tissue Properties at High Temperature and Long Operating Time

Liu

2022

Processes

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12Cr1MoV is commonly used for pressure pipes in thermal power plants. However, its service life has always prevented the development of such metallic materials. This experiment applies a tensile and impact experiment to investigate the metal cluster of 12Cr1MoV low-alloy and heat-resistant steel with 60,000 h service at 550 °C. Results indicate that, after 60,000 h of high-temperature exposure, the metal cluster of Cr, Mo, and V elements may gradually decrease. First, the decreasing elements will precipitate out of the solid solution. Then, the precipitated elements transform into carbides that accumulate and grow on the grain boundaries. The continuous growth of the precipitated carbide of alloy elements may also create pearlite in the cluster, which results in severe pearlite periodization and tensile fracture due to plastic, through-crystal fracture. Then, the solid solution-strengthened tissue disappears, which severely decreases the thermal strength of 12Cr1MoV low-alloy and heat-resistant steel. At the same time, the brittleness of the steel will increase. The end of life of the metal occurs after 60,000 h of high-temperature use at 550 °C. This result may also provide a basis for future life assessment of 12Cr1MoV steel.

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“…More chloride ions migrate inside of the pitting, resulting in acidification and autocatalytic processes in the pitting, so that once pitting occurs, the dissolution rate is quite large and it often causes accidents suddenly. Thus, the pitting mechanism of stainless steel has been extensively studied [31][32]. Pitting corrosion mainly occurs in locations where the stability of the passive film is poor such as inclusion, carbide/intermetallic interfaces.…”

Section: Pittingmentioning

confidence: 99%

Effect of microstructure on corrosion behavior of high strength martensite steel—A literature review

Wang

Dong

Cheng

et al. 2021

Int J Miner Metall Mater

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The high strength martensite steels are widely used in aerospace, ocean engineering, etc., due to their high strength, good ductility and acceptable corrosion resistance. This paper provides a review for the influence of microstructure on corrosion behavior of high strength martensite steels. Pitting is the most common corrosion type of high strength stainless steels, which always occurs at weak area of passive film such as inclusions, carbide/intermetallic interfaces. Meanwhile, the chromium carbide precipitations in the martensitic lath/prior austenite boundaries always result in intergranular corrosion. The precipitation, dislocation and grain/lath boundary are also used as crack nucleation and hydrogen traps, leading to hydrogen embrittlement and stress corrosion cracking for high strength martensite steels. Yet, the retained/reversed austenite has beneficial effects on the corrosion resistance and could reduce the sensitivity of stress corrosion cracking for high strength martensite steels. Finally, the corrosion mechanisms of additive manufacturing high strength steels and the ideas for designing new high strength martensite steel are explored.

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The evolution of microstructure and intergranular corrosion resistance of duplex stainless steel joint in multi-pass welding

Cited by 30 publications

References 13 publications

Influence of Shielding Gas on Microstructure and Properties of GMAW DSS2205 Welded Joints

Influence of Shielding Gas on Microstructure and Properties of GMAW DSS2205 Welded Joints

Influence of 12Cr1MoV Material on Tissue Properties at High Temperature and Long Operating Time

Effect of microstructure on corrosion behavior of high strength martensite steel—A literature review

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