Precipitation in Interstitial Free High Strength Steels

Ghosh, Pradyut; Ghosh, Chiradeep; Ray, R.K.

doi:10.2355/isijinternational.49.1080

Cited by 24 publications

(16 citation statements)

References 15 publications

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“…SEM analysis revealed in the temperature region near to maximum plasticity (sample X5) very deep dimples of cratered features and fine dimples on the periphery, Figure 8a. EDX analysis confirmed the presence of Fe, Ti, Mn at the bottom of deep dimples (Figure 8b), probably precipitates of FeTi, as in Reference [2] and the presence of Fe, Mn, S, probably FeMnS at the bottom of fine dimples. Our results show that the average size of particles in all three temperature zones of embrittlement in the basic programme was similar, i.e., 42, 41 and 41 nm, respectively.…”

Section: Hot Ductility Behaviour and Mechanism Of Embrittlement For Hsupporting

confidence: 62%

“…% through vacuum treatment and alloying with Ti and Nb. Microalloying elements form precipitates of carbides and nitrides and the matrix is then free of interstitial-forming elements [2]. By means of microalloying elements such as Ti and Nb the atoms of carbon and nitrogen are bonded in the interstitial positions in the ferrite grains as TiC or TiN particles, increasing the deep-drawing properties of the IF steel.…”

Section: Introductionmentioning

confidence: 99%

“…It is also known that nitrides are more stable than carbides. In their work Ghosh et al [2] observed the following precipitates in high strength intersticial free steels, commonly known as IFHS steels: TiN, TiS, Ti 4 C 2 S 2 , MnS, CuS, TiC, Fe(Ti+Nb)P/FeTiP, FeTi. Currently TiN can form in liquid as well as in solid state, which means it forms during steel solidification and continuous casting and is very stable.…”

Section: Introductionmentioning

confidence: 99%

“…FeTiP-type ternary phosphide is observed only in the higher strength types of IF steel (IFHS), and in bath-annealed IFHS steel it has been observed quite frequently, whereas in continuous-annealed IFHS steel it is rarely observed due to the very short annealing time. According to Reference [2] there is competition between TiC and FeTiP formation during batch annealing. FeTiP may become more stable than TiC in dependence on P and Ti content, and thus can degrade the deep drawability.…”

Section: Introductionmentioning

confidence: 99%

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Hot Ductility of TiNb IF Steel Slab after Hot Torsion Testing

Konrádyová

Longauerová

Jonšta

et al. 2019

Metals

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The aim of the work was to evaluate the hot ductility loss in TiNb stabilized IF steel directly from the continuously-cast slab using hot torsion testing (plastometry) in the temperature range 600–1250 °C according to the basic programme, and also after temperature cycling. A good match of the temperature dependences of number of turns to failure (Nf) and intensity of deformation Se was confirmed. In both cases, the existence of three temperature areas with decrease in plasticity to a minimum was confirmed. The two-stage temperature cycling according to the CT1150 and CT900 programmes mostly resulted in a decrease in plasticity compared to the basic programme. The most significant effect of cycling was related to the CT900 programme below the maximum plasticity in the base programme at 850 °C. A less pronounced decrease was observed for CT1150 cycling below the maximum plasticity in the base program at 1050 °C. In the case of CT1150 cycling, more complex particles were observed at the fractures compared with the basic programme, namely carbonitrides of Ti and Nb in combination with oxisulfides respectively, then Ti nitrides with oxisulfides or oxides and, in addition, complex (Fe,Nb)P4, (Ti,Nb)3S4 type particles. Their mean size determined statistically using TEM was much finer, only 20 nm versus 42 nm in the basic programme. Similarly, CT900 cycling revealed finer particles with an average size of 37 nm compared to 105 nm in the basic programme. The observed particles were Al oxides, Ti(N,C) and (Ti,Nb)2S, in contrast to the particles probably of TiFe and FeMnS in the basic programme. The decrease in plasticity corresponded to the finer particles, newly created in the temperature cycling.

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Section: Hot Ductility Behaviour and Mechanism Of Embrittlement For Hsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Hot Ductility of TiNb IF Steel Slab after Hot Torsion Testing

Konrádyová

Longauerová

Jonšta

et al. 2019

Metals

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“…It is possible that the phase transformation renders the phosphorus benign by leaving it in positions away from boundaries. The issue is now of increasing importance given that there are concerted efforts to exploit the solution strengthening of ferrite using phosphorus as a solute [22][23][24]. The purpose of the present work was to investigate the segregation behaviour of phosphorous to ferrite grain boundaries on cooling from the austenitisation temperature in a binary Fe-P alloy.…”

Section: Introductionmentioning

confidence: 99%

Segregation of phosphorus to ferrite grain boundaries during transformation in an Fe–P alloy

Kim

Pak

Park

et al. 2014

International Journal of Materials Research

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A binary alloy of iron containing 0.17 wt% of phosphorus has been heattreated under a variety of conditions in order to see whether the segregation of phosphorus to grain boundaries can be controlled. The alloy transforms fully into ferrite. It is found that the majority of solute found at the ferrite grain boundaries has its origins in the temperature range where phase transformation occurs, in other words, phosphorus that is accumulated and dragged with the growing α/γ transformation front. As a consequence, it cannot be suppressed using cooling rates as large as 400 K s −1 .

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