Microstructural refinement by the formation of acicular ferrite on Ti–Mg oxide inclusion in low-carbon steel

2021 ◽  
pp. 141795
Author(s):  
Fangce Liu ◽  
Jiawang Li ◽  
Qi Wang ◽  
Yandong Liu ◽  
Yang Bai ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Acicular Ferrite ◽  
Oxide Inclusion ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Microstructural Refinement

In situ observation of growth behaviour of acicular ferrite in low-carbon steel containing 13 ppm magnesium

2017 ◽  
Vol 46 (2) ◽  
pp. 176-183 ◽  
Author(s):  
Chi-Kang Lin ◽  
Yan-Chi Pan ◽  
Weng-Sing Hwang ◽  
Ying-Chien Fang ◽  
Yen-Hao Su ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Acicular Ferrite ◽  
Low Carbon Steel ◽  
In Situ Observation ◽  
Low Carbon ◽  
Growth Behaviour

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.

Crystallographic analysis for acicular ferrite formation in low carbon steel weld metals

2014 ◽  
Vol 29 (4) ◽  
pp. 254-261 ◽  
Author(s):  
Atsushi Takada ◽  
Yu-Ichi Komizo ◽  
Hidenori Terasaki ◽  
Tomoyuki Yokota ◽  
Kenji Oi ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Acicular Ferrite ◽  
Low Carbon Steel ◽  
Crystallographic Analysis ◽  
Steel Weld ◽  
Low Carbon ◽  
Ferrite Formation ◽  
Weld Metals

Effect of Vanadium on Development of Acicular Ferrite Microstructure in Low Carbon Steel

2008 ◽  
Vol 135 ◽  
pp. 111-114 ◽  
Author(s):  
Hyung Ha Jin ◽  
Chan Sun Shin ◽  
Hu Chul Lee
Keyword(s):  
Carbon Steel ◽  
Acicular Ferrite ◽  
Low Carbon Steel ◽  
Isothermal Transformation ◽  
Low Carbon ◽  
Side Plate ◽  
Intragranular Ferrite ◽  
Microstructural Constituent ◽  
Austenite Grains ◽  
Sympathetic Nucleation

The influence of vanadium on the development of an acicular ferrite microstructure has been investigated in a low carbon steel. Optical and electron microscopy were carried out to identify the precipitates, inclusions and constituents of the acicular ferrite microstructures. By the addition of vanadium, the main microstructural constituent was changed from a side plate ferrite to an acicular ferrite. VCN precipitates, which were known to favor the nucleation of acicular ferrite, were formed on the (Mn,Si) oxide and MnS particles. The presence of vanadium in alloys suppressed the formation of a side plate ferrite and reduced the transformation of ferrite during an isothermal transformation. Nucleation of intragranular ferrite and a subsequent sympathetic nucleation of ferrite within austenite grains were favored in the vanadium containing steel and an acicular ferrite microstructure was developed.

scholarly journals Non-Metallic Inclusions and Acicular Ferrite in Low Carbon Steel

2000 ◽  
Vol 41 (12) ◽  
pp. 1663-1669 ◽  
Author(s):  
Young Joo Oh ◽  
Sang-Yoon Lee ◽  
Jung-Soo Byun ◽  
Jae-Hyeok Shim ◽  
Young Whan Cho
Keyword(s):  
Carbon Steel ◽  
Acicular Ferrite ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Metallic Inclusions

Effect of Mg addition on nucleation of intra-granular acicular ferrite in Al-killed low carbon steel

2016 ◽  
Vol 23 (5) ◽  
pp. 415-421 ◽  
Author(s):  
Xiao-bing Li ◽  
Yi Min ◽  
Zhe Yu ◽  
Cheng-jun Liu ◽  
Mao-fa Jiang
Keyword(s):  
Carbon Steel ◽  
Acicular Ferrite ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Mg Addition

Characterization of the Acicular Ferrite in Al-Deoxidized Low-Carbon Steel Combined with Zr and Mg Additions

2016 ◽  
Vol 87 (11) ◽  
pp. 1503-1510 ◽  
Author(s):  
Yi Min ◽  
Xiaobing Li ◽  
Zhe Yu ◽  
Chengjun Liu ◽  
Maofa Jiang
Keyword(s):  
Carbon Steel ◽  
Acicular Ferrite ◽  
Low Carbon Steel ◽  
Low Carbon
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