Effect of quenching rate on hardness and microstructure of hot-stamped steel

► The hot-stamped specimens had an auto-tempered martensite microstructure. ► Below the Ms point, reducing the cooling rate significantly reduces the hardness in the hot-stamped-specimens. ► The major factor that causes the reduction in hardness in hot-stamping is auto-tempering. The effect of the c...

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Published inJournal of alloys and compounds Vol. 577; pp. S549 - S554
Main Authors Nishibata, Toshinobu, Kojima, Nobusato
Format Journal Article
LanguageEnglish
Published Elsevier B.V 15.11.2013
Subjects
Auto-tempering
Bainite
Boron steel
Boron steels
Carbon
Cementite
Cooling rate
Die pressing
Hardness
Hot-stamping
Martensite
Microstructure
Quench-hardening
Quenching (cooling)
Boron steel
Bainite
Auto-tempering
Hot-stamping
Martensite
Quench-hardening
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Abstract ► The hot-stamped specimens had an auto-tempered martensite microstructure. ► Below the Ms point, reducing the cooling rate significantly reduces the hardness in the hot-stamped-specimens. ► The major factor that causes the reduction in hardness in hot-stamping is auto-tempering. The effect of the cooling rate on the hardness and microstructure of the hot-stamped boron steel containing 0.2mass% carbon was investigated. Sheets with thicknesses of 1.6 and 1.2mm were heated to 900°C for 4min. They were then press formed and simultaneously quench hardened with dies or water quenched. Simulated hot-stamping tests were also performed at various cooling rates. The Vickers hardnesses of the quenched specimens were measured and their cross-sections were observed by optical microscopy and transmission electron microscopy. The hot-stamped specimens had an auto-tempered martensite microstructure and they were softer than the water-quenched specimens, which consisted of lath-martensite. Tempered martensite was distinguished from bainite by observing cementite precipitation. Below the Ms temperature, reducing the cooling rate significantly reduces the hardness, even when the cooling rate is higher than the upper critical cooling rate.
AbstractList The effect of the cooling rate on the hardness and microstructure of the hot-stamped boron steel containing 0.2 mass% carbon was investigated. Sheets with thicknesses of 1.6 and 1.2 mm were heated to 900 C for 4 min. They were then press formed and simultaneously quench hardened with dies or water quenched. Simulated hot-stamping tests were also performed at various cooling rates. The Vickers hardnesses of the quenched specimens were measured and their cross-sections were observed by optical microscopy and transmission electron microscopy. The hot-stamped specimens had an auto-tempered martensite microstructure and they were softer than the water-quenched specimens, which consisted of lath-martensite. Tempered martensite was distinguished from bainite by observing cementite precipitation. Below the M sub()stemperature, reducing the cooling rate significantly reduces the hardness, even when the cooling rate is higher than the upper critical cooling rate.
► The hot-stamped specimens had an auto-tempered martensite microstructure. ► Below the Ms point, reducing the cooling rate significantly reduces the hardness in the hot-stamped-specimens. ► The major factor that causes the reduction in hardness in hot-stamping is auto-tempering. The effect of the cooling rate on the hardness and microstructure of the hot-stamped boron steel containing 0.2mass% carbon was investigated. Sheets with thicknesses of 1.6 and 1.2mm were heated to 900°C for 4min. They were then press formed and simultaneously quench hardened with dies or water quenched. Simulated hot-stamping tests were also performed at various cooling rates. The Vickers hardnesses of the quenched specimens were measured and their cross-sections were observed by optical microscopy and transmission electron microscopy. The hot-stamped specimens had an auto-tempered martensite microstructure and they were softer than the water-quenched specimens, which consisted of lath-martensite. Tempered martensite was distinguished from bainite by observing cementite precipitation. Below the Ms temperature, reducing the cooling rate significantly reduces the hardness, even when the cooling rate is higher than the upper critical cooling rate.
Author Nishibata, Toshinobu
Kojima, Nobusato
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Keywords Boron steel
Bainite
Auto-tempering
Hot-stamping
Martensite
Quench-hardening
Language English
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Snippet ► The hot-stamped specimens had an auto-tempered martensite microstructure. ► Below the Ms point, reducing the cooling rate significantly reduces the hardness...
The effect of the cooling rate on the hardness and microstructure of the hot-stamped boron steel containing 0.2 mass% carbon was investigated. Sheets with...
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StartPage S549
SubjectTerms Auto-tempering
Bainite
Boron steel
Boron steels
Carbon
Cementite
Cooling rate
Die pressing
Hardness
Hot-stamping
Martensite
Microstructure
Quench-hardening
Quenching (cooling)
Title Effect of quenching rate on hardness and microstructure of hot-stamped steel
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