Acicular ferrite formation during isothermal holding in HSLA steel

2015 ◽  
Vol 51 (7) ◽  
pp. 3555-3563 ◽  
Author(s):  
Chenxi Liu ◽  
Lei Shi ◽  
Yongchang Liu ◽  
Chong Li ◽  
Huijun Li ◽  
...  
Keyword(s):  
Acicular Ferrite ◽  
Hsla Steel ◽  
Isothermal Holding ◽  
Ferrite Formation

scholarly journals Acicular ferrite formation in a medium carbon steel with a two stage continuous cooling

1999 ◽  
Vol 41 (3) ◽  
pp. 229-235 ◽  
Author(s):  
I Madariaga ◽  
I Gutiérrez ◽  
C Garcı́a-de Andrés ◽  
C Capdevila
Keyword(s):  
Carbon Steel ◽  
Acicular Ferrite ◽  
Medium Carbon Steel ◽  
Two Stage ◽  
Medium Carbon ◽  
Ferrite Formation ◽  
Continuous Cooling

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

scholarly journals Mechanism of Acicular Ferrite Formation in Low Carbon Steel Ti–B Weld Metals with Different Oxygen Levels

2010 ◽  
Vol 96 (10) ◽  
pp. 608-613 ◽  
Author(s):  
Tomonori Yamada ◽  
Hidenori Terasaki ◽  
Yu-ichi Komizo
Keyword(s):  
Carbon Steel ◽  
Acicular Ferrite ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Ferrite Formation ◽  
Oxygen Levels ◽  
Weld Metals

Effect of Calcium Addition on the Cast Microstructure of a Kind of HSLA Steel

2013 ◽  
Vol 401-403 ◽  
pp. 594-597
Author(s):  
Yan Liu ◽  
Jian Ming Wang ◽  
Chun Lin He ◽  
Li Quan Chen
Keyword(s):  
Acicular Ferrite ◽  
Positive Impact ◽  
Hsla Steel ◽  
Rapid Development ◽  
Steel Structure ◽  
High Energy ◽  
Second Phase ◽  
Great Opportunity ◽  
Calcium Addition ◽  
Cast Microstructure

The rapid development of the large steel structure brings a great opportunity for steelmaking industry. The steel plates not only have the strength and toughness but also can withstand the high energy input welding. Using the calcium oxide of high melting-point and high stability to pin the grain boundaries is an effective method to improve the welding performance of the structure steel. This experiment takes the HSLA steel as the research object, the second phase particles which would not be dissolved or aggregated at high temperature will be expected by means of adding calcium into the steel in the form of Ca-Si alloy. The effect of calcium addition on the cast microstructure of HSLA steel was analysed. The results show that the cast microstructure is mainly consist of lamellar and acicular ferrite, a small amount of pearlite and bainite. Compared with the original steel, there are acicular ferrites presenting in the experimental steel after adding 5 wt% Ca, which are the microstructure that we hope to get. The acicular ferrite will have a positive impact on the mechanical properties of the subsequent rolled steel.

scholarly journals Tracing Microalloy Precipitation in Nb-Ti HSLA Steel During Austenite Conditioning

2020 ◽  
Author(s):  
Johannes Webel ◽  
Adrian Herges ◽  
Dominik Britz ◽  
Eric Detemple ◽  
Volker Flaxa ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Ion Beam ◽  
Hsla Steel ◽  
Isothermal Holding ◽  
Resistivity Measurement ◽  
Hot Working ◽  
Electrical Resistivity Measurement ◽  
Steel Matrix ◽  
Finished Steel ◽  
Resistivity Measurements

Microalloying of low carbon steel with niobium (Nb) and titanium (Ti) is standardly applied in high-strength low-alloy (HSLA) steels enabling austenite conditioning during thermo-mechanical controlled processing (TMCP), which results in pronounced grain refinement in the finished steel. The metallurgical effects of microalloying elements are related solute drag and precipitate particle pinning, both acting on the austenite grain boundary thereby delaying or suppressing recrystallization of the deformed grain. In that respect it is important to better understand the precipitation kinetics as well as the precipitation sequence in a typical Nb-Ti-microalloyed steel. Various characterization methods have been utilized in this study for tracing microalloy precipitation after simulating different austenite TMCP conditions in a Gleeble apparatus. Atom probe tomography (APT), scanning transmission electron microscopy in a focused ion beam equipped scanning electron microscope (STEM-on-FIB) and electrical resistivity measurements provide complementary information on the precipitation status and are correlated with each other. It will be demonstrated that accurate electrical resistivity measurements can monitor the general consumption of solute microalloys (Nb) during hot working which was complemented by APT measurements of the steel matrix. On the other hand, STEM revealed that a large part of Nb-containing particles during hot working are co-precipitated with titanium during cooling from the austenitizing temperature. Precipitates that form during cooling or isothermal holding can be distinguished from strain-induced precipitates by corroborating STEM measurements with APT results. APT specifically allows obtaining detailed information about the chemical composition of precipitates as well as the distribution of elements inside the particle. Electrical resistivity measurement, on the contrary, provides macroscopic information on the progress of precipitation and can be calibrated by APT. The current paper highlights the complementarity of these methods and shows first results within the framework of a larger study on strain-induced precipitation.

scholarly journals Acicular Ferrite Formation on Ti-Rare Earth Metal-Zr Complex Oxides

2015 ◽  
Vol 55 (1) ◽  
pp. 250-256 ◽  
Author(s):  
Hidenori Nako ◽  
Yoshitomi Okazaki ◽  
John Gordon Speer
Keyword(s):  
Rare Earth ◽  
Rare Earth Metal ◽  
Acicular Ferrite ◽  
Earth Metal ◽  
Complex Oxides ◽  
Ferrite Formation

Effects of Si and Al on acicular ferrite formation in C-Mn steel

2001 ◽  
Vol 32 (1) ◽  
pp. 75-83 ◽  
Author(s):  
Jae-Hyeok Shim ◽  
Young Whan Cho ◽  
Jae-Dong Shim ◽  
Young-Joo Oh ◽  
Jung-Soo Byun ◽  
...  
Keyword(s):  
Acicular Ferrite ◽  
Ferrite Formation ◽  
Mn Steel
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