The effect of nitrogen on the precipitation behaviour of Nb(C,N) in continuously-cooled low-carbon structural steels

Bepari, Mohar Ali; Whiteman, J. A.

doi:10.1016/0924-0136(95)01896-4

Cited by 8 publications

(4 citation statements)

References 7 publications

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“…3 and 4 that steel 3 showed slightly higher wear resistance than steel 2. This increased wear resistance may be due to higher surface hardness and finer Nb(C,N) particles [17] in the hardened case of steel 3.…”

Section: Resultsmentioning

confidence: 95%

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Dry sliding wear in case-hardened niobium microalloyed steels

Islam

Bepari

Shorowordi

2005

Journal of Materials Processing Technology

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Section: Resultsmentioning

confidence: 95%

“…The higher surface hardness of steels 2 and 3, along with lower retained austenite content, increases the wear resistance of the case. Moreover, the presence of NbC in steel 2 and Nb(C,N) [17] in steel 3 further increases the wear resistance of the steels. This effect of niobium in wear resistance is also supported by Fiset et al [18].…”

Section: Resultsmentioning

confidence: 97%

Dry sliding wear in case-hardened niobium microalloyed steels

Islam

Bepari

Shorowordi

2005

Journal of Materials Processing Technology

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“…A similar phenomenon was observed in the study of V(CN) and Nb(CN) precipitation. [13][14][15][16] As the cooling rate approached 20uC s 21 , austeniteto-martensite transformation took place. There was less time at high temperature and the atomic diffusion capacity was significantly reduced, but because the steel has a high carbon-content of 0?27 wt-%, significant diffusion was not required, and a high density of smallsized spherical and cuboidal precipitates were observed at a cooling rate of 20uC s 21 .…”

Section: Discussionmentioning

confidence: 99%

Transformation and precipitation behaviour of Ti–Mo bearing high strength medium-carbon steel

Deng

Wang²,

Misra³

et al. 2013

Materials Science and Technology

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The authors describe here the transformation and precipitation behaviour of Ti-Mo bearing highstrength medium-carbon steel during continuous cooling, using a combination of thermo-simulation and microscopy approach. The study demonstrates that Ti and Mo carbides precipitate during austenite-to-ferrite, austenite-to-bainite and even during austenite-to-martensite transformations, contributing to precipitation strengthening. Four different types of precipitates in the size range of 3-200 nm were observed during the transformation. They are spherical (Ti,Mo)C and TiC, cuboidal (Ti,Mo)(C,N) and long thin strips of Fe x C. The size of the precipitates was large and the density was less during austenite transformation. However, the size decreased and density increased during the austenite-to-bainitic ferrite transformation. During the austenite-to-martensite transformation, a high density of fine and spherical-shaped precipitates comprising of Ti and Mo in the range of 3-10 nm were observed.

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“…Research on low-carbon structural steels has been very active during the past several years because of the emphasis placed on the extensive application in the field of structures, automotive components, bridges and buildings [1][2][3][4]. To improve load bearing, recent approaches have been focused on developing low-carbon microalloyed steels with excellent combinations of fracture resistance and strength for given applications in order to reduce section size and weight.…”

Section: Introductionmentioning

confidence: 99%

Enhancing mechanical properties of a low-carbon microalloyed cast steel by controlled heat treatment

Zhao

Lee

Kim

et al. 2013

Materials Science and Engineering: A

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In the present work, detailed studies were made on the optimization of microstructure and mechanical properties of a low-carbon microalloyed cast steel through control of heat treatment conditions. Specimens were austenitized at temperatures ranging from 950 to 1200 °C for 2 h followed by different cooling methods (furnace, air and water). For analyzing the effect of holding time on mechanical properties, some cast specimens were austenitized at 1100 °C for different times followed by furnace cooling. After heat treatment, mechanical tests were employed to evaluate the room temperature Charpy impact and tensile properties. The characterization of complex precipitates formed during heat treatment process was investigated by using analytical electron microscopy. The results show that dissolution of vanadium-containing precipitates plays an important role in the abnormal growth of austenite grains at 1150 °C. Further growth in austenite grains at 1200 °C is caused by the dissolution of Ti-containing particles and the reduction of the amount of precipitates. Correct selection of the austenitizing temperature, holding time and cooling method is very important to improve the mechanical properties of the steel. Heat treatment at 1100 °C for 2 h followed by furnace cooling leads to the best combination of excellent Charpy impact and tensile properties. AbstractIn the present work, detailed studies were made on the optimization of microstructure and mechanical properties of a low-carbon microalloyed cast steel through control of heat treatment conditions. Specimens were austenitized at temperatures ranging from 950 to 1200 ℃ for 2 h followed by different cooling methods (furnace, air and water). For analyzing the effect of holding time on mechanical properties, some cast specimens were austenitized at 1100 ℃ for different times followed by furnace cooling. After heat treatment, mechanical tests were employed to evaluate the room temperature Charpy impact and tensile properties. The characterization of complex precipitates formed during heat treatment process was investigated by using analytical electron microscopy. The results show that dissolution of vanadium-containing precipitates plays an important role in the abnormal growth of austenite grains at 1150 ℃.Further growth in austenite grains at 1200 ℃ is caused by the dissolution of Ti-containing particles and the reduction of the amount of precipitates. Correct selection of the austenitizing temperature, holding time and cooling method is very important to improve the mechanical properties of the steel. Heat treatment at 1100 ℃ for 2 h followed by furnace cooling leads to the best combination of excellent Charpy impact and tensile properties.

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The effect of nitrogen on the precipitation behaviour of Nb(C,N) in continuously-cooled low-carbon structural steels

Cited by 8 publications

References 7 publications

Dry sliding wear in case-hardened niobium microalloyed steels

Dry sliding wear in case-hardened niobium microalloyed steels

Transformation and precipitation behaviour of Ti–Mo bearing high strength medium-carbon steel

Enhancing mechanical properties of a low-carbon microalloyed cast steel by controlled heat treatment

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