scholarly journals Effect of Nano-Scale Copper Sulfide Particles on the Yield Strength and Work Hardening Ability in Strip Casting Low Carbon Steel

2004 ◽  
Vol 45 (2) ◽  
pp. 479-487 ◽  
Author(s):  
Zhongzhu Liu ◽  
Yoshinao Kobayashi ◽  
Kotobu Nagai
Keyword(s):  
Carbon Steel ◽  
Yield Strength ◽  
Work Hardening ◽  
Copper Sulfide ◽  
Low Carbon Steel ◽  
Strip Casting ◽  
Low Carbon ◽  
Nano Scale

scholarly journals Morphology Control of Copper Sulfide in Strip Casting of Low Carbon Steel

2007 ◽  
Vol 93 (11) ◽  
pp. 655-663 ◽  
Author(s):  
Zhongzhu LIU ◽  
Yoshinao KOBAYASHI ◽  
Kotobu NAGAI ◽  
Jian YANG ◽  
Mamoru KUWABARA
Keyword(s):  
Carbon Steel ◽  
Copper Sulfide ◽  
Low Carbon Steel ◽  
Morphology Control ◽  
Strip Casting ◽  
Low Carbon

scholarly journals Morphology Control of Copper Sulfide in Strip Casting of Low Carbon Steel

2006 ◽  
Vol 46 (5) ◽  
pp. 744-753 ◽  
Author(s):  
Zhongzhu Liu ◽  
Yoshinao Kobayashi ◽  
Kotobu Nagai ◽  
Jian Yang ◽  
Mamoru Kuwabara
Keyword(s):  
Carbon Steel ◽  
Copper Sulfide ◽  
Low Carbon Steel ◽  
Morphology Control ◽  
Strip Casting ◽  
Low Carbon

scholarly journals Characterization of Microstructure in High-Hardness Surface Layer of Low-Carbon Steel

Metals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 995
Author(s):  
Haitao Xiao ◽  
Shaobo Zheng ◽  
Yan Xin ◽  
Jiali Xu ◽  
Ke Han ◽  
...  
Keyword(s):  
Surface Layer ◽  
Carbon Steel ◽  
Yield Strength ◽  
Carbon Content ◽  
Acicular Ferrite ◽  
Lath Martensite ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Upper Bainite ◽  
Mixed Microstructure

Surface hardening improves the strength of low-carbon steel without interfering with the toughness of its core. In this study, we focused on the microstructure in the surface layer (0–200 μm) of our low-carbon steel, where we discovered an unexpectedly high level of hardness. We confirmed the presence of not only upper bainite and acicular ferrite but also lath martensite in the hard surface layer. In area of 0–50 μm, a mixed microstructure of lath martensite and B1 upper bainite was formed as a result of high cooling rate (about 50–100 K/s). In area of 50–200 μm, a mixed microstructure of acicular ferrite and B2 upper bainite was formed. The average nanohardness of the martensite was as high as 9.87 ± 0.51 GPa, which was equivalent to the level reported for steel with twenty times the carbon content. The ultrafine laths with an average width of 128 nm was considered to be a key cause of high nanohardness. The average nanohardness of the ferrites was much lower than for martensite: 4.18 ± 0.39 GPa for upper bainite and 2.93 ± 0.30 GPa for acicular ferrite. Yield strength, likewise, was much higher for martensite (2378 ± 123 MPa) than for upper bainite (1007 ± 94 MPa) or acicular ferrite (706 ± 72 MPa). The high yield strength value of martensite gave the surface layer an exceptional resistance to abrasion to a degree that would be unachievable without additional heat treatment in other steels with similar carbon content.

On the Work-hardening Description of Low Carbon Steel Sheets by a Microstructure Based Model

2014 ◽  
Author(s):  
Orlando León García ◽  
Rafael Fagundes Ferreira ◽  
Victor Carretero Olalla ◽  
Roumen Petrov
Keyword(s):  
Carbon Steel ◽  
Work Hardening ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Steel Sheets

Review on the Hall-Petch Relation in Ferritic Steel

2010 ◽  
Vol 654-656 ◽  
pp. 11-16 ◽  
Author(s):  
Setsuo Takaki
Keyword(s):  
Grain Size ◽  
Carbon Steel ◽  
Yield Strength ◽  
Yield Point ◽  
Ferritic Steel ◽  
Low Carbon Steel ◽  
Aging Treatment ◽  
Interstitial Free ◽  
Low Carbon ◽  
Petch Relation

Yielding of polycrystalline low carbon steel is characterized by a clear yield point followed by unstable Lüders deformation and such a yielding behavior is taken over to fine grained steel with the grain size of 1μm or less. Yield strength of ferritic steel is increased with grain refinement standing on the Hall-Petch relation. The following equation is realized up to 0.2μm grain size in the relation between yield strength y and grain size d: y [MPa]= 100+600×d[μm]-1/2. In low carbon steel, it might be concluded that the Hall-Petch coefficient (ky) is around 600MPa•μm1/2. However, the ky value of interstitial free steels is substantially small as 130-180MPa•μm1/2 and it can be greatly increased by a small amount of solute carbon less than 20ppm. It was also cleared that the disappearance of yield point by purifying is due to the decrease in the ky value. On the other hand, the ky value is changeable depending on heat treatment conditions such as cooling condition from an elevated temperature and aging treatment at 90°C. These results suggest the contribution of carbon segregation at grain boundary in terms of the change in the ky value. On the contrary, substitutional elements such as Cr and Si do not give large influence to the ky value in comparison with the effect by carbon.

scholarly journals Isothermal Precipitation Behavior of Copper Sulfide in Ultra Low Carbon Steel

2007 ◽  
Vol 47 (11) ◽  
pp. 1672-1679 ◽  
Author(s):  
Zhongzhu Liu ◽  
Mamoru Kuwabara ◽  
Yosihisa Iwata
Keyword(s):  
Carbon Steel ◽  
Copper Sulfide ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Precipitation Behavior ◽  
Ultra Low Carbon Steel

Change in Yield Strength of Nb-Bearing Ultra-Low Carbon Steels by Temper-Rolling

2018 ◽  
Vol 941 ◽  
pp. 230-235
Author(s):  
Ling Ling Yang ◽  
Tatsuya Nakagaito ◽  
Yoshimasa Funakawa ◽  
Katsumi Kojima
Keyword(s):  
Carbon Steel ◽  
Yield Strength ◽  
Low Carbon Steel ◽  
Carbon Steels ◽  
Temper Rolling ◽  
Low Carbon ◽  
Solute Carbon ◽  
Ultra Low Carbon Steel ◽  
Dislocation Strengthening ◽  
Carbon Change

Yield strength of low carbon mild steel decreases when temper-rolling is applied to release yield point elongation. Generally mobile dislocation used to be considered as the cause of the YS lowering. However from Bailey-Hirsch theory, strength should be higher with temper-rolling because of the increase of dislocation density. To newly explain the lowering yield strength by temper-rolling, standing at the point that a few ppm carbon change Hall-Petch coefficient , decrease in yield strength by temper-rolling is investigated using an ultra-low carbon steel. Yield strength of steel with the small amount of solute carbon increased after 2% temper-rolling and didn’t change after aging. On the other hand, yield strength of steel with the high amount of solute carbon decreased after 2% temper-rolling and increased again after aging. Despite solute carbon content, the Hall-Petch σ0 increased by dislocation strengthening of temper-rolling. Hall-Petch coefficient ky of low solute carbon steel remained at the low level even after temper-rolling or aging , however, that of high solute carbon steels significantly decreased after temper-rolling and increased again after aging. Yield strength reduction of the high solute carbon steel can be attributed to the decrease of ky.

scholarly journals Development of a Hot-rolled Low Carbon Steel with High Yield Strength

2006 ◽  
Vol 46 (5) ◽  
pp. 754-758 ◽  
Author(s):  
Hai-Long Yi ◽  
Lin-Xiu Du ◽  
Guo-Dong Wang ◽  
Xiang-Hua Liu
Keyword(s):  
Carbon Steel ◽  
Yield Strength ◽  
Low Carbon Steel ◽  
High Yield ◽  
Low Carbon ◽  
High Yield Strength ◽  
Hot Rolled
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