Mg处理对厚板中第二相粒子、HAZ组织及韧性的影响

摘要/Abstract

摘要： 综述了Mg对钢中第二相粒子、HAZ组织及韧性的影响，同时讨论了w(Ti)/w(N)及Al、Nb和B等合金元素对Mg处理钢板组织和性能的影响。当w(Mg)=27×10^-6时，HAZ中IAF体积分数最高，为55.4 %，能够促进IAF生长有效夹杂物尺寸集中在2 μm左右。随着Mg含量增加，钢中纳米TiN粒子增量细化析出，HAZ的低温冲击功值随着纳米TiN粒子的体积密度增加呈直线关系上升。对于铁素体船板钢，Mg处理后促进了晶内针状铁素体的生长，添加49×10^-6的w(Mg)后，-40 ℃焊接热影响区的冲击韧性从20 J增加到167 J。对于贝氏体海工钢，添加42×10^-6的w(Mg)后，第二相粒子的高温下溶解量大，钉扎力下降，晶粒粗大，-40 ℃ HAZ韧性从加w(Mg)=2×10^-6的201 J降低到加w(Mg)=42×10^-6的58 J。w(Ti)/w(N)保持在3.42左右较为合适，此时第二相析出粒子数量较多，尺寸较小，增强了对晶界的钉扎作用。Al的添加会降低钢的HAZ韧性，当w(Al)=200×10^-6时，-20 ℃的冲击功从201 J降低到75 J。Nb添加后晶粒粗大，增加了钢中的脆性组织，Mg处理钢中加入160×10^-6的w(Nb)后，-40 ℃ HAZ冲击韧性从127 J降低到58 J。B会提高钢的淬透性，在晶界处的偏聚抑制了晶界铁素体的形成，Mg处理钢中加入22×10^-6的w(B)，-40 ℃冲击韧性从40 J提高到141 J。

关键词: Mg处理, 氧化物冶金, 第二相粒子, 韧性, 焊接热影响区

Abstract: The effect of Mg treatment on secondary phase particles, microstructure and toughness in the HAZ of steel plate were reviewed, and the combined effect of w(Ti)/w(N), Al, Nb and B on microstructure and toughness of the Mg treatment steel plates were discussed. When the Mg mass fraction was 27×10^-6, the volume fraction of IAF in HAZ had the highest value of 55.4 %, and the size of effective inclusions to promote the growth of IAF was concentrated at about 2 μm. With the increase of Mg content, TiN nanoparticles in steel were incrementally refined, and the value of the low-temperature impact toughness in HAZ zone increased linearly with the increase of the volume density of TiN nanoparticles. For ferritic shipbuilding steel plate, Mg treatment promoted the growth of intragranular acicular ferrite. After adding Mg mass fraction with 49×10^-6, the impact toughness of the heat affected zone at -40 ℃ increased from 20 J to 167 J. For bainite marine engineering steel plate, after adding Mg mass fraction with 42×10^-6, the secondary phase particle dissolution amount at high temperature became large, the pinning force decreased, and the grain size was coarsened. The toughness of HAZ at -40 ℃ decreased from 201 J with w(Mg)=2×10^-6to 58 J with w(Mg)=42×10^-6. The optimum w(Ti)/w(N) was maintained at about 3.42. At this time, the number of precipitated particles in the secondary phase increases and the size decreased, which enhanced the pinning effect on grain boundaries. The addition of Al would reduce the HAZ toughness of the steel plate and the impact toughness at -20 ℃ was reduced from 201 J to 75 J when the Al mass fraction was 200×10^-6. After adding Nb,the brittle structure in steel was increased. The HAZ impact toughness at -40 ℃ decreased from 127 J to 58 J after adding Nb mass fraction with 160×10^-6to Mg treatment steel plate. B would improve the hardenability of the steel, and the segregation at the grain boundary inhibits the formation of grain boundary ferrite. The impact toughness at -40 ℃ increased from 40 J to 141 J when 22×10^-6w(B) was added to the Mg treatment steel plate.

Key words: magnesium treatment, oxide metallurgy, secondary phase particles, toughness, heat affected zone

张玉旗, 张银辉, 杨健. Mg处理对厚板中第二相粒子、HAZ组织及韧性的影响[J]. 炼钢, 2023, 39(2): 1-17.

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Mg处理对厚板中第二相粒子、HAZ组织及韧性的影响

Effect of Mg treatment on secondary phase particles, microstructure and toughness in the HAZ of steel plate

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