Austenite Grain Growth in a 2.25Cr-1Mo Vanadium-Free Steel Accounting for Zener Pinning and Solute Drag: Experimental Study and Modeling

2017 ◽  
Vol 48 (5) ◽  
pp. 2289-2300 ◽  
Author(s):  
S. Dépinoy ◽  
B. Marini ◽  
C. Toffolon-Masclet ◽  
F. Roch ◽  
A.-F. Gourgues-Lorenzon
Keyword(s):  
Experimental Study ◽  
Grain Growth ◽  
Solute Drag ◽  
Zener Pinning ◽  
Austenite Grain ◽  
Austenite Grain Growth

scholarly journals Austenite grain growth simulation considering the solute-drag effect and pinning effect

2017 ◽  
Vol 18 (1) ◽  
pp. 88-95 ◽  
Author(s):  
Naoto Fujiyama ◽  
Toshinobu Nishibata ◽  
Akira Seki ◽  
Hiroyuki Hirata ◽  
Kazuhiro Kojima ◽  
...  
Keyword(s):  
Grain Growth ◽  
Solute Drag ◽  
Drag Effect ◽  
Growth Simulation ◽  
Solute Drag Effect ◽  
Pinning Effect ◽  
Austenite Grain ◽  
Austenite Grain Growth

Influence of the Mg content on the austenite grain growth in heat-affected zone of offshore engineering steels considering TiN particle pinning and Mo solute drag effects

2021 ◽  
Vol 118 (4) ◽  
pp. 409
Author(s):  
Xiaoqian Pan ◽  
Jian Yang ◽  
Yinhui Zhang ◽  
Joohyun Park ◽  
Hideki Ono
Keyword(s):  
Growth Rate ◽  
Grain Growth ◽  
Heat Affected Zone ◽  
Welding Process ◽  
Solute Drag ◽  
Pinning Force ◽  
Offshore Engineering ◽  
Austenite Grain ◽  
Austenite Grain Growth ◽  
Mg Content

The submicrometre and nanometre particle characteristics, soluble element contents, and austenite grain growth behaviors in heat-affected zone of offshore engineering steels with 0.0002 (2Mg) and 0.0042 (42Mg) wt.% Mg during the simulated welding process were studied. With increasing the Mg content in steel from 0.0002 to 0.0042 wt.%, the submicron particles are decreased in number and size with their compositions evolved from TiN to TiN + MgO capped with Mo carbides, and the number density of small-sized nanoparticles increases and large-sized nanoparticles decreases. When the temperature is below 1250 °C, the grain growth rate of two steels is not much different due to the larger Mo solute drag effect in 2Mg and larger pinning force in 42Mg. When the temperature is 1250–1300 °C, the small-sized nanoparticles in 42Mg is more than that in 2Mg, resulting in the larger pinning force and smaller grain growth rate in 42Mg. When heated to 1300–1350 °C and soaked at 1350 °C for 300 s, since large quantities of particles smaller than the critical size (dcr) are dissolved, the grain growth rate in 2Mg is smaller than that in 42Mg due to the greater amount of the effective pinning particles and larger pinning force in 2Mg.

Austenite Grain Growth Simulation in Welding Heat-Affected Zone

2018 ◽  
Vol 941 ◽  
pp. 620-626 ◽  
Author(s):  
Naoto Fujiyama ◽  
Akira Seki
Keyword(s):  
Grain Growth ◽  
Heat Affected Zone ◽  
Solute Drag ◽  
Two Dimensions ◽  
Low Alloy Steels ◽  
Pinning Force ◽  
Drag Effect ◽  
Solute Drag Effect ◽  
Austenite Grain ◽  
Austenite Grain Growth

To predict austenite grain growth behavior in the heat-affected zone (HAZ) in low alloy steels, a new calculation model is proposed herein. This model mainly considers the solute-drag effect and pinning effect, which restrain the austenite grain growth. To calculate the solute-drag effect, the grain boundary concentration of each element is obtained by Hillert’s Law. Calculations are performed by simulating the HAZ with a temperature gradient using the phase field method for two dimensions. This calculation demonstrates the possibility of quantitatively predicting the pinning force for welding heat inputs.

scholarly journals Precipitation Criterion for Inhibiting Austenite Grain Coarsening during Carburization of Al-Containing 20Cr Gear Steels

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 504
Author(s):  
Huasong Liu ◽  
Yannan Dong ◽  
Hongguang Zheng ◽  
Xiangchun Liu ◽  
Peng Lan ◽  
...  
Keyword(s):  
Grain Growth ◽  
Abnormal Grain Growth ◽  
Grain Structure ◽  
Pinning Force ◽  
Grain Coarsening ◽  
Zener Pinning ◽  
Austenite Grain ◽  
Composition Optimization ◽  
Gear Steels ◽  
Grain Growth Behavior

AlN precipitates are frequently adopted to pin the austenite grain boundaries for the high-temperature carburization of special gear steels. For these steels, the grain coarsening criterion in the carburizing process is required when encountering the composition optimization for the crack-sensitive steels. In this work, the quantitative influence of the Al and N content on the grain size after carburization is studied through pseudocarburizing experiments based on 20Cr steel. According to the grain structure feature and the kinetic theory, the abnormal grain growth is demonstrated as the mode of austenite grain coarsening in carburization. The AlN precipitate, which provides the dominant pinning force, is ripened in this process and the particle size can be estimated by the Lifshitz−Slyosov−Wagner theory. Both the mass fraction and the pinning strength of AlN precipitate show significant influence on the grain growth behavior with the critical values indicating the grain coarsening. These criteria correspond to the conditions of abnormal grain growth when bearing the Zener pinning, which has been analyzed by the multiple phase-field simulation. Accordingly, the models to predict the austenite grain coarsening in carburization were constructed. The prediction is validated by the additional experiments, resulting in accuracies of 92% and 75% for the two models, respectively. Finally, one of the models is applied to optimize the Al and N contents of commercial steel.

Austenite Grain Growth in High Manganese Steels

2019 ◽  
Vol 50 (12) ◽  
pp. 5760-5766 ◽  
Author(s):  
Madhumanti Bhattacharyya ◽  
Yves Brechet ◽  
Gary R. Purdy ◽  
Hatem S. Zurob
Keyword(s):  
Grain Growth ◽  
High Manganese ◽  
Austenite Grain ◽  
High Manganese Steels ◽  
Austenite Grain Growth ◽  
Manganese Steels
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