Effect of microstructural constituents on strength–toughness combination in a low carbon bainitic steel

Lan, Huifang; Du, Linxiu; Misra, R.D.K.

doi:10.1016/j.msea.2014.05.084

Cited by 100 publications

(46 citation statements)

References 20 publications

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“…Dispersed and tiny M-A constituents do not affect weld metal toughness [8,9]. Massive M-A constituents have a greater effect on toughness than slender M-A constituents [10][11][12]. Toughness improves with the increase in slender M-A constituents but decreases with the increase in massive ones [13,14].…”

Section: Introductionmentioning

confidence: 96%

Microstructural Changes and Impact Toughness of Fill Pass in X80 Steel Weld Metal

Bai

Ding

Tong

et al. 2019

Metals

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Multi-pass welding is used in high-pressure and thick-walled pipes in natural gas and oil pipelines. When a welding layer of a welded joint is subjected to different welding thermal cycles, its microstructure and properties change, thereby affecting the overall welding performance. In this study, the temperature and microstructural variations of the fill pass 2 (FP2) in the entire welding process were investigated by combining the thermal cycle with the cascade welding method. The original FP2 and FP2 after double thermal cycles had the worse deformation ability by tensile test. The toughness of FP2 improved after a single thermal cycle, decreased after double thermal cycles, and improved again after triple thermal cycles. The content of martensite–austenite (M–A) constituents and the average grain size of FP2 in the cascade samples were inversely proportional to FP2 toughness. Massive M–A constituents and their unique distribution at the inter-critical temperature were harmful to weld metal toughness. Controlling the size and fraction of M–A constituents can improve weld metal toughness.

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Section: Introductionmentioning

confidence: 96%

Microstructural Changes and Impact Toughness of Fill Pass in X80 Steel Weld Metal

Bai

Ding

Tong

et al. 2019

Metals

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“…In correspondence to the effect of test temperature, for A940, the value of vE first significantly reduces from 64 J to11 J, then remained almost similar when the test temperature decreases to − 60°C; for A910, the value of vE decreases linearly from 72 J to 9 J with decreasing test temperature; for A880, the value of vE first reduces a small extent from 128 J to 120 J, then decreases significantly with decrease in impact test temperature. According to the previous studies, [24][25][26][27][28][29][30][31] the Charpy impact energy is influenced by the texture of the material and the kind, volume fraction, size and morphology of the phases. It has been reported that the α-fiber RD// < 110 > can lead to the delamination and effectively enhance the lowtemperature toughness, especially for warm-rolled carbon steel.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…However, the precipitation carbides deteriorate the impact toughness. 31,32) On the basis of the microstructural characteristics of three specimens with different finish rolling temperature, the results of the lowest impact toughness of A940 and the highest impact toughness of A880, can be understood. Moreover, the refined cementite particles and the occurrence of acicular ferrite with relatively small effective grain size at finish rolling temperature 880°C also improve the impact toughness.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Microstructural Characteristics with Various Finish Rolling Temperature and Low Temperature Toughness in Hot Rolled Nb–Ti Ferritic Steel

Ji¹,

Li²,

Tang³

et al. 2016

ISIJ Int.

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“…The M-A constituents can exhibit various morphologies such as massive, slender, and small dot shapes [14,15]. Specifically, the M-A constituents with small dot as well as dispersed and distributed shapes to not significantly contribute to the decrease in toughness [16]. A previous study reported that the slender M-A constituents crack more easily than massive M-A constituents in YS 480 MPa grade steel welds [17].…”

Section: Introductionmentioning

confidence: 96%

Effect of Martensite–Austenite Constituent on Low-Temperature Toughness in YS 500 MPa Grade Steel Welds

Kim

Nam

Lee

et al. 2018

Metals

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Abstract:The effect of martensite-austenite (M-A) constituents and simulated microstructure on low-temperature toughness was investigated in YS 500 MPa grade structural steel welds. The specimens were fabricated using a direct quenching and tempering process. After simulated weld thermal cycles, the coarse-grained heat-affected zone (CGHAZ) and intercritically reheated coarse-grained heat-affected zone (IRCGHAZ) were produced using a Gleeble tester and real welded joint to support the simulation results. The largest low-temperature toughness was observed in the fine-grained heat-affected zone (FGHAZ) owing to the fine-ferrite microstructure. However, the toughness decreased in the IRCGHAZ because of the slender morphology of the M-A constituents that formed primarily along the prior austenite grain boundaries in the IRCGHAZ.

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Effect of microstructural constituents on strength–toughness combination in a low carbon bainitic steel

Cited by 100 publications

References 20 publications

Microstructural Changes and Impact Toughness of Fill Pass in X80 Steel Weld Metal

Microstructural Changes and Impact Toughness of Fill Pass in X80 Steel Weld Metal

Microstructural Characteristics with Various Finish Rolling Temperature and Low Temperature Toughness in Hot Rolled Nb–Ti Ferritic Steel

Effect of Martensite–Austenite Constituent on Low-Temperature Toughness in YS 500 MPa Grade Steel Welds

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