Effects of Ti-Al Complex Deoxidization Inclusions on Nucleation of Intragranular Acicular Ferrite in C-Mn Steel

2015 ◽  
Vol 87 (4) ◽  
pp. 445-455 ◽  
Author(s):  
Qi Huang ◽  
Xinhua Wang ◽  
Min Jiang ◽  
Zhiyong Hu ◽  
Chengwei Yang
Keyword(s):  
Acicular Ferrite ◽  
Intragranular Acicular Ferrite ◽  
Mn Steel

Effects of Mn and Al on the Intragranular Acicular Ferrite Formation in Rare Earth Treated C–Mn Steel

2017 ◽  
Vol 36 (7) ◽  
pp. 683-691 ◽  
Author(s):  
Mingming Song ◽  
Bo Song ◽  
Zhanbing Yang ◽  
Shenghua Zhang ◽  
Chunlin Hu
Keyword(s):  
Rare Earth ◽  
Acicular Ferrite ◽  
Lattice Misfit ◽  
Ferrite Formation ◽  
Al Content ◽  
Bainite Structure ◽  
Mn Content ◽  
Intragranular Acicular Ferrite ◽  
Upper Bainite ◽  
Mn Steel

AbstractThe influence of Al, Mn and rare earth (RE) on microstructure of C–Mn steel was investigated. The capacities of different RE inclusions to induce intragranular acicular ferrite (AF) formation were compared. Result shows that RE treatment could make C–Mn steel from large amounts of intragranular AF. Al killed is detrimental to the formation of intragranular AF in RE-treated C–Mn steel. An upper bainite structure would replace the AF when Al content increased to 0.027 mass %. The optimal Mn content to form AF is about 0.75–1.31 mass %. The effective RE inclusion which could induce AF nucleation is La2O2S. When patches of MnS are attached on the surface of La2O2S inclusion, AF nucleation capacity of RE-containing inclusion could enlarge obviously. The existence of manganese-depleted zone and low lattice misfit would be the main reason of La-containing inclusion inducing AF nucleation in C–Mn steel.

scholarly journals The Microstructure and Property of the Heat Affected zone in C-Mn Steel Treated by Rare Earth

2019 ◽  
Vol 38 (2019) ◽  
pp. 362-369 ◽  
Author(s):  
Ming-ming Song ◽  
Yu-min Xie ◽  
Bo Song ◽  
Zheng-liang Xue ◽  
Nan Nie ◽  
...  
Keyword(s):  
Rare Earth ◽  
Impact Toughness ◽  
Heat Affected Zone ◽  
Acicular Ferrite ◽  
Steel Matrix ◽  
Impact Properties ◽  
Treated Steel ◽  
The Impact ◽  
Welding Processes ◽  
Mn Steel

AbstractThe microstructures and impact properties of the heat affected zone (HAZ) in steel treated by rare earth (RE) under different welding processes were discussed. The effect of Al on the impact properties of the HAZ in RE treated steel was analyzed. It finds that when the welding t8/5 is smaller than 111 s, the main microstructure in steels is bainite/widmanstatten. The impact toughness of the HAZ is lower than that of the steel matrix. When t8/5 is more than 250 s, the microstructure is mainly acicular ferrite (AF) in the steel treated by RE, and the impact toughness of HAZ is obviously improved. Even under the welding processing with t8/5 about 600 s in RE treated steel can still obtain a lot of AF. While in the steel killed by Al and treated by RE, the main microstructure is parallel cluster of bainite/widmanstatten, and the impact toughness of HAZ is significantly lower than that of low-Al RE treated steel. Al can deteriorate the optimizing of RE treatment on HAZ.

scholarly journals Formation of Acicular Ferrite in Mg Treated Ti-bearing C–Mn Steel

2015 ◽  
Vol 55 (7) ◽  
pp. 1468-1473 ◽  
Author(s):  
Ming-ming Song ◽  
Bo Song ◽  
Chun-lin Hu ◽  
Wen-bin Xin ◽  
Gao-yang Song
Keyword(s):  
Acicular Ferrite ◽  
Mn Steel

scholarly journals Effects of Heat-Treatment Temperature on the Microstructure and Mechanical Properties of Steel by MgO Nanoparticle Additions

Materials ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 1707
Author(s):  
Yutao Zhou ◽  
Shufeng Yang ◽  
Jingshe Li ◽  
Wei Liu ◽  
Anping Dong
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Acicular Ferrite ◽  
Heat Treatment Temperature ◽  
Treatment Temperature ◽  
Formation Mechanisms ◽  
Isothermal Heat Treatment ◽  
Mgo Nanoparticles ◽  
Intragranular Acicular Ferrite ◽  
Mgo Nanoparticle

The characteristics and formation mechanisms of intragranular acicular ferrite (IAF) in steel with MgO nanoparticle additions were systematically investigated for different isothermal heat-treatment temperatures, and its influence on mechanical properties was also clarified. The results indicate that the inclusions were finely dispersed and refined after adding MgO nanoparticles. In addition, with decreasing heat-treatment temperature, the microstructure changed from grain boundary ferrite (GBF) and polygonal ferrite (PF) to intragranular acicular ferrite. Moreover, the steel with MgO additions had excellent mechanical properties in the temperature range of 973 to 823 K and an average Charpy absorbed energies value of around 174 J at 873 K due to the significant refinement of the microstructure and nucleation of intragranular acicular ferrite.

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