Progress in thermomechanical control of steel plates and their commercialization

Nishioka, Kiyoshi; Ichikawa, Kohei

doi:10.1088/1468-6996/13/2/023001

Cited by 100 publications

(107 citation statements)

References 32 publications

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“…In particular, control of the microstructure is the key to the development of advanced, high-performance steels, and has been achieved by heat treatment, or more recently, by thermomechanical processes together with alloy designs of steels. 1) Typical examples of microstructure control can be seen in the recent advanced automobile steels; DP (Dual-Phase) and TRIP (TRansformation-InducedPlasticity) steels. Their microstructures are schematically shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Development of Multilayer Steels for Improved Combinations of High Strength and High Ductility

2014

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Multilayer steels have been developed to provide a novel route to achieving higher-performance steels by employing a high-strength steel and a high-ductility steel independently in the layer structure. In this article, a background to the development, design, fabrication, properties, and applications of multilayer steels are overviewed. Multilayer steels exhibit improved combinations of strength and ductility compared with existing monolithic steels and also excellent deformation behaviors under high-strain-rate deformation as well as good formability. Those improved performances of multilayer steel are achieved by increased interfacial toughness between the layers and decreased thickness of the brittle steel layers according to the fracture toughness of the brittle steel and the strength of the ductile steel. The concept of multilayer steels is extended by applying different combinations of components, such as Mg-steel multilayer composite.

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Section: Introductionmentioning

confidence: 99%

Development of Multilayer Steels for Improved Combinations of High Strength and High Ductility

2014

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“…The strain-induced precipitation is very effective in retarding the recrystallisation of austenite. This leads to a higher Sv value and eventually grain refinement on the transformed products [64]. The rolling temperature for strain-induced precipitation to occur is generally between 1000 to 800°C [59,65], which is within the deformation temperature range for the finishing passes during hot rolling.…”

Section: Niobiummentioning

confidence: 99%

Thermomechanical Processing of Structural Steels with Dilute Niobium Additions

Cui¹,

Patel²,

Palmiere³

2015

HSLA Steels 2015, Microalloying 2015 &Amp; Offshore Engineering Steels 2015

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-i - AbstractIn this thesis, the influence of various dilute Nb additions (0.005-0.02 wt%) on austenite microstructure evolution along thermomechanical processing, in terms of austenite recrystallisation and grain growth, were investigated using steels with three carbon content levels.At the homogenisation temperature of 1250°C, all dilute Nb additions were dissolved in low carbon steels whereas the Nb dissolution limits for 0.4 wt% and 0.6 wt% C steels were 0.012 wt% and 0.08 wt%, respectively. Dilute Nb additions did not show significant influence on homogenised austenite grain size. The dramatic increase in C contents was more influential, which decreased the homogenised austenite grain size.The influence of dilute Nb additions and C contents on dynamic recrystallisation behaviour was studied by rough rolling at high deformation temperature with low strain rate. The dilute Nb additions were found to increase the critical strain of dynamic recrystallisation whereas C contents showed no influence on the dynamic recrystallisation behaviour.The austenite recrystallisation behaviour after finish rolling and after the holding period between finishing passes were studied by means of interrupted plane strain compression (PSC) tests and double hit PSC tests. It was found that with low Nb supersaturation, recrystallisation happened prior to Nb precipitation. Solute Nb in austenite delayed the onset of austenite recrystallisation through solute drag effect.With high Nb supersaturation, Nb precipitation occurred before the onset of recrystallisation which completely retarded austenite recrystallisation.The austenite grain growth during the holding period between finish rolling passes was studied by the evolution of prior-austenite grain size before and after the 20s holding period at the highest finish rolling temperature (1050°C). There was no Nb precipitation found and the difference in austenite grain growth behaviour was Abstract -iiattributed to the solute drag effect from both Nb and C in solution. It was found that Nb in solution suppressed austenite grain growth. However, the effectiveness of solute Nb in suppressing austenite grain growth was affected by the C content. Acknowledgement

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“…Low carbon bainitic steels are candidate materials used for their combination of high strength and low-temperature toughness by applying thermomechanically controlled processes (TMCPs) [2][3][4]. Although the base metal (BM) has excellent toughness, deterioration of the toughness in welded joints occurs for large heat input welds.…”

Section: Introductionmentioning

confidence: 99%

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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Progress in thermomechanical control of steel plates and their commercialization

Cited by 100 publications

References 32 publications

Development of Multilayer Steels for Improved Combinations of High Strength and High Ductility

Development of Multilayer Steels for Improved Combinations of High Strength and High Ductility

Thermomechanical Processing of Structural Steels with Dilute Niobium Additions

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

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