Effect of Boron Precipitation Behavior on the Hot Ductility of Boron Containing Steel

Cho, Kyung Chul; Mun, Dong Jun; Kim, Jin Young; Park, Joong Kil; Lee, Jae Sang; Koo, Yang Mo

doi:10.1007/s11661-010-0211-9

Cited by 35 publications

(25 citation statements)

References 20 publications

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“…The hot ductility of the B containing steel was found to be sensitive to the cooling rate in the range of 1 to 20 o C/s, whereas that of B-free steel showed little change with cooling rate. Increased cooling rate causes deepening and widening of the ductility trough in B containing steel as shown Fig.2.56 [146]. Particle tracking autoradiography (PTA) analysis and transmission electron microscope (TEM) images of the samples showed that BN particles formed along prior austenite grain boundaries, and that as cooling rate increases, these particles become smaller and more numerous as shown Fig.2.57 [146].…”

Section: Boronmentioning

confidence: 94%

“…Increased cooling rate causes deepening and widening of the ductility trough in B containing steel as shown Fig.2.56 [146]. Particle tracking autoradiography (PTA) analysis and transmission electron microscope (TEM) images of the samples showed that BN particles formed along prior austenite grain boundaries, and that as cooling rate increases, these particles become smaller and more numerous as shown Fig.2.57 [146]. This increase in the number of small BN precipitates may promote intergranular fracture, leading to a decrease in hot ductility in the lower austenite temperature region (900 to 1000 o C).…”

Section: Boronmentioning

confidence: 98%

“…Recently, the effect of boron precipitation behavior on the hot ductility of B containing steel was investigated by Cho et al [146,147]. The hot ductility of the B containing steel was found to be sensitive to the cooling rate in the range of 1 to 20 o C/s, whereas that of B-free steel showed little change with cooling rate.…”

Section: Boronmentioning

confidence: 99%

See 2 more Smart Citations

Hot ductility of TWIP steels

Kang

Tuling

Banerjee

et al. 2011

Materials Science and Technology

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The hot ductility of twin induced plasticity (TWIP), 0·6 wt-C steels containing 18–22 wt-Mn with N levels in the range 0·005–0·023 wt- and the Al additions either low (<0·05 wt-) or high (1·5 wt-) has been examined. Little change in ductility occurred in the temperature range 1100–650°C as the structure was always fully austenitic. Ductility was generally poor (<40), reduction of area values, the best ductility at the higher Al level being given by the steel with the lowest N and S levels. Because the steel is fully austenitic, the ductility is solely dependent on that for unrecrystallised austenite. Therefore, to avoid transverse cracking the volume of second phase particles should be kept to a minimum, i.e. the N should be low to reduce the amount of AlN that can be precipitated out and the S level should be as low as possible to limit the amount of MnS inclusions. Metallographic and TEM studies were carried out and the poor ductility was found to be due to extensive precipitation of AlN at the austenite grain boundaries. Increasing the cooling rate from the melting point to the test temperature from 60 to 180°C min−1 or introducing an undercooling step both led to even worse ductility.

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Section: Boronmentioning

confidence: 94%

Section: Boronmentioning

confidence: 98%

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Hot ductility of TWIP steels

Kang

Tuling

Banerjee

et al. 2011

Materials Science and Technology

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“…It caused by the austenite/ ferrite transformation as discussed below. Cho et al 21,22) reported that the thickness of intergranular ferrite was the main reason which has great influences on hot ductility at the austenite and ferrite two-phase region. Generally, the strainstress curves obtained from hot tensile experiment are not ideal for studying the DRX due to the occurrence of necking.…”

Section: Resultsmentioning

confidence: 99%

“…It is well known that the second phases precipitate more faster if the components with higher diffusion coefficient. 21) Boron has greater diffusion coefficient than other alloying elements. For example, the diffusion coefficient of boron in low carbon steel is on the order of 10 ¹10 m 2 /s at 1200°C in Fe, 24,25) and the diffusion coefficient of nitrogen is slightly less than that of boron.…”

Section: Influence Of Boron Addition On the Hot Ductility Of Low-carbmentioning

confidence: 99%

Influence of Boron Addition on the Hot Ductility of Low-Carbon Aluminum-Killed Steel

Liu

Shi

et al. 2015

Mater. Trans.

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The hot ductility of low-carbon aluminum-killed steel with different boron contents was investigated. The hot tensile experiment was conducted using Gleeble3500 simulator. The reduction of area of each specimen was determined to estimate the quality of hot ductility. The changes of precipitates in studied steel were calculated by Thermo-Calc software. The microstructures of specimens were observed using optical microscopy (OM), sanning electron microscopy (SEM) and transmission electron microscopy (TEM). Based on the experimental results, the fracture types of specimens were analyzed. The results show that the hot ductility improves with increase in boron content. In the experimental condition of this study, the combining ability of boron with nitrogen is greater than that aluminum and nitrogen in the energetics point of view. Coarse BN particles decrease the effect of pinning grain boundary by fine AlN. Boron in solid solution plays a role of inhibiting the austenite/ ferrite transformation. The improvement of hot ductility is caused by the formation of coarse BN and existence of boron in solid solution.

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Effect of Sampling Locations on Hot Ductility of Low Carbon Alloyed Steels

Zhang

Wang

2018

steel research int.

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Influences of steel composition and cooling rate on the steel hot ductility have been studied comprehensively. Microstructural examination reveals chill, columnar, columnar to equiaxed transition (CET) and equiaxed zones in the slab cross‐section from surface to center. Little paper reports the effect of tensile test specimens sampling position and sampling direction from the slab on the hot ductility behavior. In the current study, the hot ductility of specimens extracted from different sampling positions and different directions is detected using a thermal simulator Gleeble 1500 (Dynamic Systems, Inc., Poestenkill, NY) to determine the brittle temperature range of the steel. In addition, investigations are made currently to reveal the effect of the strain rate and holding temperature on the steel hot ductility. Some conclusions can be made in the current study: 1) the sampling position has much influence on the hot ductility behavior and the specimens extracted from the columnar zone performs the best hot ductility; 2) the hot ductility improves observably with the increasing of the strain rate, as a result of the dynamic recrystallization and dynamic stain hardening; 3) the increasing of the holding temperature performs a negative effect on the steel hot ductility.

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Effect of Boron Precipitation Behavior on the Hot Ductility of Boron Containing Steel

Cited by 35 publications

References 20 publications

Hot ductility of TWIP steels

Hot ductility of TWIP steels

Influence of Boron Addition on the Hot Ductility of Low-Carbon Aluminum-Killed Steel

Effect of Sampling Locations on Hot Ductility of Low Carbon Alloyed Steels

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