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<p>The changes of austenite grain sizes and second phase particles in the shipbuilding steel plates with Mg deoxidation used for the high heat input welding (HHIW) were studied for the different holding times of 5, 10, 30 and 60&#xa0;min at the high temperature of 1350&#xa0;°C. The size of the prior austenite grains (PAGs) increases from 40 to 78&#xa0;μm, and the relationship between the austenite size and the holding times is given by <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({D}^{3.98}-3{9}^{3.98}=9.40\times 1{0}^{3}t\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msup> <mrow> <mi>D</mi> </mrow> <mrow> <mn>3.98</mn> </mrow> </msup> <mo>-</mo> <mn>3</mn> <msup> <mrow> <mn>9</mn> </mrow> <mrow> <mn>3.98</mn> </mrow> </msup> <mo>=</mo> <mn>9.40</mn> <mo>×</mo> <mn>1</mn> <msup> <mrow> <mn>0</mn> </mrow> <mn>3</mn> </msup> <mi>t</mi> </mrow> </math></EquationSource> </InlineEquation>. The nanoparticles in steel are TiN particles. With increasing the holding time from 5 to 60&#xa0;min at 1350&#xa0;°C, the average size of TiN particles increases from 22 to 66&#xa0;nm, and the number density decreases from 1.31 × 10<sup>5</sup> to 0.29 × 10<sup>5</sup>&#xa0;mm<sup>− 2</sup>. With increasing the holding time at 1350&#xa0;°C, both the driving force and pinning force for austenite grain growth decrease. Within initial 10&#xa0;min of holding time, the austenite grain growth rate is slightly faster. As the holding time increases, the austenite grain size grows linearly. The primary factor for the slightly fast austenite grain growth is the dissolution of a large number of pinning particles during the early stage of holding.</p>

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Effect of Holding Time on Prior Austenite Grain Sizes and TiN Particles in Mg-Treated Steels Used for HHIW at the High Temperature of 1350 °C

  • 期刊论文

  • 发表日期：

    2025年3月28日

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  • Yu-qi Zhang,
  • Jian Yang,
  • Yin-hui Zhang,
  • Liang Wang,
  • Ting-ting Li,
  • Yan-li Chen,
  • Rong-bin Li

摘要

The changes of austenite grain sizes and second phase particles in the shipbuilding steel plates with Mg deoxidation used for the high heat input welding (HHIW) were studied for the different holding times of 5, 10, 30 and 60 min at the high temperature of 1350 °C. The size of the prior austenite grains (PAGs) increases from 40 to 78 μm, and the relationship between the austenite size and the holding times is given by \({D}^{3.98}-3{9}^{3.98}=9.40\times 1{0}^{3}t\) D 3.98 - 3 9 3.98 = 9.40 × 1 0 3 t . The nanoparticles in steel are TiN particles. With increasing the holding time from 5 to 60 min at 1350 °C, the average size of TiN particles increases from 22 to 66 nm, and the number density decreases from 1.31 × 105 to 0.29 × 105 mm− 2. With increasing the holding time at 1350 °C, both the driving force and pinning force for austenite grain growth decrease. Within initial 10 min of holding time, the austenite grain growth rate is slightly faster. As the holding time increases, the austenite grain size grows linearly. The primary factor for the slightly fast austenite grain growth is the dissolution of a large number of pinning particles during the early stage of holding.