Effects of sulphur on hot ductility of low-carbon steel austenite

Yasumoto, Kunio; Maehara, Yasuhiro; Ura, S.; Ohmori, Yasuya

doi:10.1179/026708385790086975

Cited by 15 publications

(30 citation statements)

References 3 publications

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“…[9][10][11] Low carbon steels with similar Mn/S ratios (15 and 30) to steel C1 (19.1) were tested by Suzuki et al, [10] and low ductility was observed between 1123 K and 1423 K (850°C to 1150°C), a similar range as observed for this study. Low ductility was attributed to precipitation of MnS at austenite grain boundaries.…”

Section: E Role Of Sulfur On Hot Ductilitysupporting

confidence: 85%

“…[4][5][6][7][8] This mechanism was found to occur in low carbon steels with low Mn/S ratios, where precipitation of MnS at the austenite grain boundaries during cooling to the tensile test temperature caused embrittlement. [9][10][11][12] It has also been put forward that S decreases the binding energy between austenite grain boundaries and the matrix, thus promoting intergranular failure. [9] Sulfide inclusions have been shown to be instrumental in affecting hot ductility, but the exact embrittlement mechanism is not fully understood.…”

Section: Kristin R Carpenter Chris R Killmore and Rian Dippenaarmentioning

confidence: 99%

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Influence of Isothermal Treatment on MnS and Hot Ductility in Low Carbon, Low Mn Steels

Carpenter¹,

Killmore²,

Dippenaar

2013

Metall Mater Trans B

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Hot ductility tests were used to determine the hot-cracking susceptibility of two low-carbon, low Mn/S ratio steels and compared with a higher-carbon plain C-Mn steel and a low C, high Mn/S ratio steel. Specimens were solution treated at 1623 K (1350 °C) or in situ melted before cooling at 100 K/min to various testing temperatures and strained at 7.5 x 10-4 s -1, using a Gleeble 3500 Thermomechanical Simulator. The low C, low Mn/S steels showed embrittlement from 1073 K to 1323 K (800 °C to 1050 °C) because of precipitation of MnS at the austenite grain boundaries combined with large grain size. Isothermal holding for 10 minutes at 1273 K (1000 °C) coarsened the MnS leading to significant improvement in hot ductility. The highercarbon plain C-Mn steel only displayed a narrow trough less than the Ae3 temperature because of intergranular failure occurring along thin films of ferrite at prior austenite boundaries. The low C, high Mn/S steel had improved ductility for solution treatment conditions over that of in situ melt conditions because of the grain-refining influence of Ti. The higher Mn/S ratio steel yielded significantly better ductility than the low Mn/S ratio steels. The low hot ductility of the two low Mn/S grades was in disagreement with commercial findings where no cracking susceptibility has been reported. This discrepancy was due to the oversimplification of the thermal history of the hot ductility testing in comparison with commercial production leading to a marked difference in precipitation behavior, whereas laboratory conditions promoted fine sulfide precipitation along the austenite grain boundaries and hence, low ductility.

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Section: E Role Of Sulfur On Hot Ductilitysupporting

confidence: 85%

Section: Kristin R Carpenter Chris R Killmore and Rian Dippenaarmentioning

confidence: 99%

Influence of Isothermal Treatment on MnS and Hot Ductility in Low Carbon, Low Mn Steels

Carpenter¹,

Killmore²,

Dippenaar

2013

Metall Mater Trans B

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“…[11][12][13][14] Furthermore, a decrease in the reheating temperature and an increase in the holding time before deformation also restrain hot ductility loss. 11,13) The critical ratio of manganese to sulfur to prevent embrittlement is about 30 when the manganese content is above 0.1 mass%. 13) In this case, (Fe,Mn)S precipitates or segregated sulfur at the austenite grain boundaries may deteriorate the strength of the austenite grain boundary.…”

mentioning

confidence: 99%

Hot Ductility of Sulfur-containing Low Manganese Mild Steels at High Strain Rate

Kizu¹,

Urabe²

2009

ISIJ Int.

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“…It may cause hot surface cracking of slabs in low alloy steels, since the hot ductility depends largely on the g grain size [3][4][5] and the intergranular fracture in the g phase results in the surface cracks. [3][4][5][6][7][8][9] Thus it is important to clarify the mechanism of the g structure evolution after solidification.…”

Section: Introductionmentioning

confidence: 99%

Influence of Phosphorus on Solidification Structure in Continuously Cast 0.1 mass% Carbon Steel.

2003

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In 0.1 mass% carbon steels with phosphorus contents ranging from 0.01 to 0.2 mass%, slabs were continuously cast to a thickness of 100 mm with a laboratory scale caster. Their macro-and micro-structures were characterized, focusing on the effects of phosphorus addition on the structural evolution during solidification and subsequent cooling. Cast slabs of high phosphorus steels have a fine columnar-g-grain structure. The mean width of the columnar grain was approximately half of that in the cast slabs without the phosphorus addition. Dispersed globular a grains were observed in the a grain structure of high phosphorus steels. The globular grains evolved at the phosphorus-rich spots in the prior-g grain. The micro-segregation of phosphorus results in these structural evolutions. Since the phosphorus enrichment stabilizes bcc (d or a) phase locally at the inter-dendritic region, the phosphorus-rich spot makes d phase retained to lower temperature for the d/g transformation, and provides a predominant site for the g/a transformation. In the high phosphorus casts, therefore, the dispersed d phase are thought to pin the g grain growth more effectively in the dϩg region when the completion of the d/g transformation is remarkably suppressed by the phosphorus segregation.

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Effects of sulphur on hot ductility of low-carbon steel austenite

Cited by 15 publications

References 3 publications

Influence of Isothermal Treatment on MnS and Hot Ductility in Low Carbon, Low Mn Steels

Influence of Isothermal Treatment on MnS and Hot Ductility in Low Carbon, Low Mn Steels

Hot Ductility of Sulfur-containing Low Manganese Mild Steels at High Strain Rate

Influence of Phosphorus on Solidification Structure in Continuously Cast 0.1 mass% Carbon Steel.

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