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<p>The effects of Ti/N ratio on the number densities of nano particles, the size of the prior austenite grain (PAG) and the toughness of the heat-affected zone (HAZ) of Mg-deoxidized steels were studied after high heat input welding of 400&#xa0;kJ/cm. With increasing the Ti/N ratio from 2.7 to 5.7, the cuboid nano-sized particles are formed, and their number density increases. The area fractions of ductile intragranular acicular ferrites (IAFs) have the highest value and the area fractions of brittle microstructures of ferrite side plates and upper bainites have the lowest value in TN30 steel. With the Ti/N ratio of about 3.0, the HAZ of steel plate has the best low-temperature toughness. With increasing the Ti/N ratio from 2.7 to 5.7, the PAG sizes after the high-temperature laser scanning confocal microscopy observation decrease linearly with increasing the number densities of nano-sized particles. The PAG size of TN30 steel is between 100 and 150&#xa0;μm, which is conducive to the nucleation of IAFs.</p>

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Effect of Ti/N ratio on TiN particles, prior austenite grains and toughness of HAZ of steel plates with Mg deoxidization after high heat input welding

  • 期刊论文

  • 发表日期：

    2025年4月9日

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

摘要

The effects of Ti/N ratio on the number densities of nano particles, the size of the prior austenite grain (PAG) and the toughness of the heat-affected zone (HAZ) of Mg-deoxidized steels were studied after high heat input welding of 400 kJ/cm. With increasing the Ti/N ratio from 2.7 to 5.7, the cuboid nano-sized particles are formed, and their number density increases. The area fractions of ductile intragranular acicular ferrites (IAFs) have the highest value and the area fractions of brittle microstructures of ferrite side plates and upper bainites have the lowest value in TN30 steel. With the Ti/N ratio of about 3.0, the HAZ of steel plate has the best low-temperature toughness. With increasing the Ti/N ratio from 2.7 to 5.7, the PAG sizes after the high-temperature laser scanning confocal microscopy observation decrease linearly with increasing the number densities of nano-sized particles. The PAG size of TN30 steel is between 100 and 150 μm, which is conducive to the nucleation of IAFs.