Effect of C-Mn ratio on the maximum hardness and toughness in TMCP steels with an identical carbon equivalent

Lee, S. H.; Kim, Ki Hyuk; Van, Donghyun; Nam, Seunghoon

doi:10.1016/j.jmrt.2020.06.010

Cited by 5 publications

(2 citation statements)

References 28 publications

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“…Alloy elements are normally employed to ensure these properties. However, the weldability of alloyed steel is normally degraded because of the increase in the carbon equivalent ( C eq ) of the welds [ 3 , 4 ]. Cold cracking generally occurs in the heat-affected zone (HAZ) of normal carbon steel after welding at a temperature lower than 200 °C.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive Analysis of Cold-Cracking Ratio for Flux-Cored Arc Steel Welds Using Y- and y-Grooves

et al. 2021

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This study investigates various factors that influence the cold-cracking ratio (CCR) of flux-cored arc welds through Y- and y-groove tests. Factors affecting the CCR include the alloy component, diffusible hydrogen content, microstructure, hardness, and groove shape. In weld metals (WMs; WM375-R and WM375-B) of a low-strength grade, the diffusible hydrogen content has a more significant effect on the CCR than the carbon equivalent (Ceq) and microstructure. However, the combined effects of the microstructure and diffusible hydrogen content on the CCR are important in high-strength-grade WM. The CCR of the WM increased upon increasing Ceq and the strength grade because hard martensite and bainite microstructures were formed. Moreover, y-groove testing of the 500 MPa grade WM revealed a more significant CCR than that of the 375 MPa grade WM. Therefore, in high-strength-grade WMs, it is necessary to select the groove shape based on the morphology in the real welds.

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Section: Introductionmentioning

confidence: 99%

Comprehensive Analysis of Cold-Cracking Ratio for Flux-Cored Arc Steel Welds Using Y- and y-Grooves

et al. 2021

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“…Due to low carbon and microalloying, combined with different TMCP conditions, the microstructure of high-strength pipeline steel usually contains different microstructure components, such as polygonal ferrite (PF), quasi-polygonal ferrite (QF), acicular ferrite (AF), bainite ferrite (BF), and martensite–austenite (MA) constituents, forming a complex mixed microstructure with different characteristics. The addition of micro-alloying elements, such as Mn, Mo, Cr, Ni, V, Nb, and Ti, can help to obtain ideal microstructure and mechanical properties [ 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Tempering Treatment on Microstructural Evolution and Mechanical Behavior of Heavy-Wall Heat Induction Seamless Bend Pipe

Liu

Wang

et al. 2021

Materials

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In this paper, the microstructure and mechanical properties of heavy-wall seamless bend pipe after quenching at different tempering temperatures, including 550 °C, 600 °C, 650 °C, and 700 °C, were studied. Microstructure and dislocations observations were characterized by means of an optical microscope, a scanning electron microscope, a transmission electron microscope, and X-ray diffraction. As the tempering temperature increases, the dislocation density in the test steel gradually decreases, and the precipitation behavior of (Nb, V)(C, N) increases. The sample tempered at 650 °C exhibits a granular bainite structure with a dislocation cell structure and a large number of smaller precipitates. The yield platforms of tempered samples at 650 °C and 700 °C are attributed to the pinning effect of the Cottrell atmosphere on dislocations. The sample tempered at 650 °C not only presents the highest strength, but also the highest uniform elongation, which is attributed to the higher strain-hardening rate and instantaneous work-hardening index. This is closely related to the multiplication of dislocations, the interaction between dislocations and dislocations, and the interaction between dislocations and precipitates during plastic deformation of the 650 °C-tempered samples with low dislocation density, which delays the occurrence of necking.

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Improvement of plasticity and toughness of ultra-high strength martensitic steels via tailoring trace ferrite

Yan,

Xue,

Zhang

et al. 2023

Materials Science and Engineering: A

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Effect of C-Mn ratio on the maximum hardness and toughness in TMCP steels with an identical carbon equivalent

Cited by 5 publications

References 28 publications

Comprehensive Analysis of Cold-Cracking Ratio for Flux-Cored Arc Steel Welds Using Y- and y-Grooves

Comprehensive Analysis of Cold-Cracking Ratio for Flux-Cored Arc Steel Welds Using Y- and y-Grooves

Effect of Tempering Treatment on Microstructural Evolution and Mechanical Behavior of Heavy-Wall Heat Induction Seamless Bend Pipe

Improvement of plasticity and toughness of ultra-high strength martensitic steels via tailoring trace ferrite

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