Effect of rolling reduction below γ non-recrystallization temperature on pancaked γ, microstructure, texture and low-temperature toughness for hot rolled steel

Tian, Yong; Wang, H.T.; Ye, Qibin; Wang, Q.H.; Wang, Z.D.; Wang, G.D.

doi:10.1016/j.msea.2020.139640

Cited by 21 publications

(10 citation statements)

References 31 publications

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“…The details of the distributions of the grain boundary misorientations angle over the scanned region are listed in Figure 6 a to explore the essence of the high HAGB proportion in the two‐step thermomechanical process. The same data obtained from the conventional TMCP process in our previous studies [ 12,13 ] are also compared in the abovementioned figure. Overall, the low‐frequency distribution below 15° and the high‐frequency distribution that appeared at 15°–62.5° ensured 69.9–71.8% HAGB proportions in the two‐step thermomechanical process.…”

Section: Resultsmentioning

confidence: 94%

“…The HAGB proportions of R65, R57, and R50 steels remained practically unchanged with 71.8%, 71.0%, and 69.9%, which are all significantly higher than our previous studies that focus on the steels with similar thicknesses (42–44 mm) and chemical composition. [ 3,12,13 ] Figure 4 shows the curves of accumulated area fraction as a function of EGS. It can be seen that the maximum EGS in the three plates is the same (38.4–44.1 μm), but the curve slope of R50 steel is larger, which means that the effective grains of the small size have an advantage in the measured region.…”

Section: Resultsmentioning

confidence: 99%

“…The critical parameter of Ac 3 was calculated as 846 °C through Equation (1) [ 11 ]

{Ac}_{3} false(° C false) = 937.3 - 224.5 {ω_{normalC}}^{1 / 2} - 17 ω_{Mn} + 34 ω_{Si} - 14 ω_{Ni} + 21.6 ω_{Mo} + 41.8 ω_{normalV} - 20 ω_{Cu}

where ω C , ω Mn , ω Si , ω Ni , ω Mo , ω V , and ω Cu are the concentrations of carbon, manganese, silicon, nickel, molybdenum, vanadium, and copper in weight percent. In addition, two conventional rolled steels with similar material in our previous experiments [ 12,13 ] were taken as a reference to prove the superior properties in improving the HAGB proportion (Table 1).…”

Section: Methodsmentioning

confidence: 99%

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A Two‐Step Thermomechanical Process for Improving High‐Angle Grain Boundary Proportion and Achieving Delamination Toughening in Hot‐Rolled Steel with a Limited Slab‐to‐Plate Ratio

Wang

Tian

et al. 2022

steel research int.

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A two-step thermomechanical process is utilized to increase high-angle grain boundary (HAGB) proportion and achieve delamination cracks in hot-rolled steel produced by a limited slab-to-plate ratio. Three plates are austenitized at 900 °C and hot rolled with 65%, 57%, and 50% reduction at 880-800 °C after rolling at 1100-1050 °C followed by water cooling. Water quenching tests are carried out to prove the advantages of the two-step thermomechanical process. The steels having 69.9-71.8% HAGB proportion and delamination cracks are fabricated with a final thickness of 48 mm and a total rolling reduction ratio of 3.33. The high HAGB proportion is attributed to the abnormally refined prior austenite grain of 18.5 AE 10.5 μm caused by the heating temperature of 900 °C. Thus, 93-129% more effective interfacial area (193-229 mm À1 ) can be provided than the conventional process (100 mm À1 ) during rolling below the nonrecrystallization temperature of austenite. Abundant ferrite grains that form and impinge from the different prior austenite grains obtain 33.6-34.5% frequency distribution of the grain boundary misorientation angles, which fall into 20°-47°. The premises of delamination toughening are that the delamination cracks appear at the opposite side of the V-notch with a reduced number.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

“…The critical parameter of Ac 3 was calculated as 846 °C through Equation (1) [ 11 ]

{Ac}_{3} false(° C false) = 937.3 - 224.5 {ω_{normalC}}^{1 / 2} - 17 ω_{Mn} + 34 ω_{Si} - 14 ω_{Ni} + 21.6 ω_{Mo} + 41.8 ω_{normalV} - 20 ω_{Cu}

Section: Methodsmentioning

confidence: 99%

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A Two‐Step Thermomechanical Process for Improving High‐Angle Grain Boundary Proportion and Achieving Delamination Toughening in Hot‐Rolled Steel with a Limited Slab‐to‐Plate Ratio

Wang

Tian

et al. 2022

steel research int.

View full text Add to dashboard Cite

show abstract

“…The PAGs should be fully flattened so that enough intragranular nucleation sites can be provided to generate abundant intragranular ferrite grains. [ 9 ] In addition, due to the higher dislocation densities in flattened fine‐grained austenite, bainite laths can be suppressed by deformation substructures through the mechanism of mechanical stabilization of austenite. Consequently, the restricted length of bainite laths is obtained.…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies have shown that the performance of heavy‐gauge steel could be determined by synergistic effects of complicated microstructural characteristics, including microstructure types, effective grain size (EGS), high‐angle grain boundary (HAGB) proportion, texture, second phases, as well as their gradient across the thickness. [ 9,10 ] However, most of the literatures were so obsessed with the steel produced in the laboratory and ignored the industrial steel with a large thickness, and the mechanisms for refining grains are ill‐defined for industrial heavy‐gauge steels.…”

Section: Introductionmentioning

confidence: 99%

Mechanism for Refining Grains and Effect of Microstructural Characteristics on Low‐Temperature Toughness for Industrial EH460 Heavy‐Gauge Steel

Wang

Tian

Kan

et al. 2021

steel research int.

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The mechanism for refining grains in industrial EH460 heavy‐gauge steel with a thickness of 80 mm and above is investigated using electron backscattered diffraction. Charpy impact and drop‐weight tests are conducted to quantify the effect of microstructures and texture on low‐temperature toughness. Abundant ferrite grains that form and impinge from different prior‐austenite grains increase the high‐angle grain boundary (HAGB) fraction. The result is a refined effective grain size of 3.7 ± 4.2 μm, a high HAGB fraction of 62.1%, and an average Charpy impact absorbed energy of ≈209 J at −80 °C. The excellent impact toughness is due to the high intensity of texture with types of {113}−{112}<110> and {332}<113>, as well as the uniformly distributed {110} slip planes and {001} cleavage planes. The high intensities of {110}<111> and {110}<112> also improve the drop‐weight toughness. However, due to plastic constraint in the larger drop‐weight specimens, increased plane strain in the inner regions is the root cause of the brittle fracture of these specimens at −70 °C. Nevertheless, the improved drop‐weight performance is attributed to the plane stress deformation at the specimen edges and also the occurrence of delamination in the central section.

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Current research status and development trends in rolling oil sludge treatment

Ge,

Mai,

et al. 2024

Asia-Pacific J Chem Eng

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Rolling oil sludge (ROS) is a type of solid waste produced during steel rolling; this waste contains not only a high iron content but also many harmful organic components and is a very attractive secondary resource. This paper introduces the sources and hazards of ROS, summarizes the recycling methods integrated with steel production, classifies traditional treatment technologies, and analyzes their advantages and disadvantages. Combined treatment is the main direction of ROS treatment methods in the future. The ROS recycling techniques applied in different industries are summarized. Finally, existing problems and future work are described to promote the remediation and resource utilization of ROS.

show abstract

Effect of rolling reduction below γ non-recrystallization temperature on pancaked γ, microstructure, texture and low-temperature toughness for hot rolled steel

Cited by 21 publications

References 31 publications

A Two‐Step Thermomechanical Process for Improving High‐Angle Grain Boundary Proportion and Achieving Delamination Toughening in Hot‐Rolled Steel with a Limited Slab‐to‐Plate Ratio

A Two‐Step Thermomechanical Process for Improving High‐Angle Grain Boundary Proportion and Achieving Delamination Toughening in Hot‐Rolled Steel with a Limited Slab‐to‐Plate Ratio

Mechanism for Refining Grains and Effect of Microstructural Characteristics on Low‐Temperature Toughness for Industrial EH460 Heavy‐Gauge Steel

Current research status and development trends in rolling oil sludge treatment

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