Effects of carbon equivalent and cooling rate on tensile and Charpy impact properties of high-strength bainitic steels

Sung, Hyokyung; Shin, Sang Yong; Hwang, Byoungchul; Lee, Chang Gil; Kim, Nack J.; Lee, Sunghak

doi:10.1016/j.msea.2011.10.015

Cited by 48 publications

(14 citation statements)

References 16 publications

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“…According to the previous researches [32][33][34][35][36], the Charpy absorbed energy is affected by the kind, volume fraction, size, and morphology of individual phases composing a material. Among these, as the steels developed in the present study are all composed of the single ferrite phase with a polygonal and/or quasi-polygonal shape, only the ferrite grain size is considered to be influential.…”

Section: Impact Propertiesmentioning

confidence: 99%

“…12, these CT 670 1C steels had some amount of degenerated pearlite and/or cementite phases (o $ 5% in volume fraction), which are known as brittle phase, due to the high CT. It has been reported that brittle phases, such as cementite, pearlite, martensite, etc., degrade the Charpy absorbed energy of the material, particularly at low temperatures, and just 5% volume fraction of these brittle phases gives rise to an increase of the ETT by 2À30 1C [32][33][34][35][36]. Therefore, the abnormal increase in the ETT of the CT 670 1C steels appears to result from the generation of these brittle phases during the coiling process.…”

Section: Impact Propertiesmentioning

confidence: 99%

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Development of Ti and Mo micro-alloyed hot-rolled high strength sheet steel by controlling thermomechanical controlled processing schedule

Kim

Song

Seo

et al. 2013

Materials Science and Engineering: A

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Section: Impact Propertiesmentioning

confidence: 99%

Section: Impact Propertiesmentioning

confidence: 99%

Development of Ti and Mo micro-alloyed hot-rolled high strength sheet steel by controlling thermomechanical controlled processing schedule

Kim

Song

Seo

et al. 2013

Materials Science and Engineering: A

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“…The %El of steel 2 was found to be marginally lower in comparison to steel 1 ( Table 2). Sung et al [16] also reported an increase in strength and decrease in elongation with increasing CE or cooling rate. In addition to the alloying elements, variation in cooling rates can produce various microstructures in steels.…”

Section: Alloy Design and Microstructurementioning

confidence: 90%

Effect of molybdenum addition on hardenability of chromium-boron steels used for press hardening applications

Deepa¹,

Sahoo²,

Dhua³

2018

J min metall B Metall

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Two laboratory heats of low-Carbon low-alloy steels, one with boron and chromium additions and other with boron, chromium and molybdenum additions were made and cast into pencil ingots. These ingots were hot-rolled to 2 mm sheets suitable for press hardening application in an experimental rolling mill. A detailed study was made on the effect of various alloying elements on the microstructure and mechanical properties of these steels. A significantly higher hardness (~496 VHN), yield strength (~1137 MPa) and ultimate tensile strength (~1673 MPa) with comparable elongation (~6%) could be achieved in the as rolled and water-quenched Mo-Cr-B steel in comparison to Cr-B steel under similar processing condition. Moreover, a reduction of critical cooling rate by10 o C/s was observed in this steel to obtain fully martensitic structure. The combined addition of boron, chromium and molybdenum was found to be more effective than that of boron and chromium in enhancing the microstructure and mechanical properties of boron-added steels. Additionally, a few hot compression tests were carried out to simulate the press hardening process of these experimental steels. It was found that one of the press hardening process parameters, viz., prior strain had a greater impact on the transformation behaviour of Cr-B and Mo-Cr-B steels during cooling.

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“…In consideration of the effects of individual elements on steel hardening tendency, especially the role of the C, 8) the cold crack sensitivity is evaluated indirectly by calculating the carbon equivalent (CE), the formula of CE is employed to judge the hardening tendency that recommended by the IIW:…”

Section: Welding Preheating Temperaturementioning

confidence: 99%

Prediction of the Temperature Distribution and Microstructure in the HAZ of SA508Gr4 Reactor Pressure Vessel Steel

Bai

Xing

et al. 2017

ISIJ Int.

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Effects of carbon equivalent and cooling rate on tensile and Charpy impact properties of high-strength bainitic steels

Cited by 48 publications

References 16 publications

Development of Ti and Mo micro-alloyed hot-rolled high strength sheet steel by controlling thermomechanical controlled processing schedule

Development of Ti and Mo micro-alloyed hot-rolled high strength sheet steel by controlling thermomechanical controlled processing schedule

Effect of molybdenum addition on hardenability of chromium-boron steels used for press hardening applications

Prediction of the Temperature Distribution and Microstructure in the HAZ of SA508Gr4 Reactor Pressure Vessel Steel

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