Solute drag effect on austenite grain growth in hypoeutectoid steel

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.

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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

Metallurgical Research & Technology ◽

10.1051/metal/2021052 ◽

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.

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

Metallurgical and Materials Transactions A ◽

10.1007/s11661-017-4002-4 ◽

2017 ◽

Vol 48 (5) ◽

pp. 2289-2300 ◽

Cited By ~ 5

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

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The Solute Drag Effect during Recrystallisation and Grain Growth in Austenite

Materials Science Forum ◽

10.4028/www.scientific.net/msf.715-716.673 ◽

2012 ◽

Vol 715-716 ◽

pp. 673-678 ◽

Cited By ~ 1

Author(s):

W. Kranendonk

Keyword(s):

Grain Growth ◽

Hot Rolling ◽

Solute Drag ◽

Present Knowledge ◽

Drag Effect ◽

Solute Drag Effect ◽

Subsequent Research ◽

Steel Grades

The relevance of the solute drag phenomenon to the hot rolling of modern steel grades is outlined. An overview of our present knowledge of solute drag in grain growth and recrystallisation in austenite is presented and recommendations for subsequent research are given.

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