Effects of Cooling Rate during Solidification and Charging Temperature Prior to Hot-rolling on Mechanical Properties of Multi-phase Hot-rolled Sheet Steels

Tsukatani, Ichiro; Yakushiji, Terutoshi; Katsumata, Masaaki; Hosomi, Koji; Sudo, Masatoshi

doi:10.2355/tetsutohagane1955.74.7_1493

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…[6][7][8] In this study, since the difference of grain size in HDR and CCR routes is small, the reason for higher strength in HDR route can not be attributed to the difference of the grain size. Papers [9][10][11][12][13][14] referring to direct hot rolling process or hot charge rolling process showed the same tendency and explained it as the difference in solute Nb content calculated by solubility product of Nb(C,N) at the reheating temperature. Therefore the higher tensile strength in HDR of present study is explained as solute Nb before hot rolling is higher than those of CCR route.…”

Section: Tensile Strengthmentioning

confidence: 88%

Effect of Nb on Hot Rolled High Strength Steel Sheets Produced by Thin Slab Casting and Hot Direct Rolling Process

Hashimoto¹

2003

ISIJ International

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Section: Tensile Strengthmentioning

confidence: 88%

Effect of Nb on Hot Rolled High Strength Steel Sheets Produced by Thin Slab Casting and Hot Direct Rolling Process

Hashimoto¹

2003

ISIJ International

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“…These cracks seriously affect the production efficiency and reduce the product qualification rate. [8][9][10][11][12][13][14] Prevention of the extra precipitation of AlN in the casting process is an important issue, which requires in-depth investigation of the precipitation and growth mechanisms of AlN.…”

Section: Introductionmentioning

confidence: 99%

Effects of the Cooling Rate and Recovery Temperature on the Growth of AlN Precipitates in Gear Steel

Shen

Cheng

Hou

et al. 2022

steel research int.

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During the continuous casting and rolling process of gear steel, AlN precipitation often causes surface cracks on the cast slab. Rapid cooling of the slab surface is a new concept to inhibit AlN and improve the cracking resistance, but it requires further investigation for practical application. Here, the effects of the cooling rate and recovery temperature on AlN growth behavior in gear steel are investigated by designing five cooling conditions. A mathematical model to describe the growth characteristics is constructed based on Ostwald ripening theory. The experimental results show that the cooling rate significantly influences the size and quantity of AlN. When the cooling rate increases from 3.0 to 5.0 °C s−1, the average diameter of AlN decreases from 133.6 to 75.8 nm and the number density of AlN decreases from 6.8 × 105 to 2.1 × 105 cm−2. The calculated results show that AlN has maximum size, which significantly decreases with decreasing temperature. When AlN reaches the maximum size, it stops growing. AlN growth during the cooling process mainly occurs above 800 °C. Therefore, a high cooling rate and a recovery temperature lower than 800 °C are key to inhibiting AlN precipitation and improving the cracking resistance.

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Effect of charging temperature of continuous casting slab on the surface cracks of HSLA steel thick plate

Shen,

Cheng,

Zhang

et al. 2024

Engineering Failure Analysis

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Effects of Cooling Rate during Solidification and Charging Temperature Prior to Hot-rolling on Mechanical Properties of Multi-phase Hot-rolled Sheet Steels

Cited by 3 publications

References 2 publications

Effect of Nb on Hot Rolled High Strength Steel Sheets Produced by Thin Slab Casting and Hot Direct Rolling Process

Effect of Nb on Hot Rolled High Strength Steel Sheets Produced by Thin Slab Casting and Hot Direct Rolling Process

Effects of the Cooling Rate and Recovery Temperature on the Growth of AlN Precipitates in Gear Steel

Effect of charging temperature of continuous casting slab on the surface cracks of HSLA steel thick plate

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