镁处理对钢中夹杂物以及HAZ组织和性能的影响

doi:10.13228/j.boyuan.issn0449-749x.20200551

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Abstract The research on oxide metallurgy with magnesium treatment is very active in recent year. In order to summarize the latest achievements of the research on oxide metallurgy with magnesium treatment, the effect of Mg treatment on inclusions and HAZ microstructure and properties of steel plate was reviewed. The microscale Mg-containing oxide and sulfide inclusions formed by Mg treatment can induce the formation of acicular ferrite. The results show that the nano precipitates formed during Mg treatment can inhibit the growth of original austenite grains by pinning the austenite grain boundaries. The pinning particles are TiN below 300 nm, MgO + TiN complex inclusions formed by TiN precipitation on MgO surface, and Mg oxides or sulfides and their complex inclusions. These two kinds of oxide metallurgy mechanisms are helpful to improve the low-temperature impact toughness of heat-affected zone (HAZ) of steel plate after high heat input welding. Mg treatment can modify oxide and sulfide in steel at the same time, change the composition and morphology of sulfide, form complex inclusions with magnesium oxide as the core surrounding MnS to inhibit the formation of dendrite MnS, promote the formation of fine and spherical MnS inclusions in steel, and improve the machinability of steel. Moreover, the force between the magnesium-containing inclusions is about 1/10 of the force between the Al₂O₃ inclusions, and the action distance is about 2/5 of the maximum action distance of the Al₂O₃inclusions, so that the Mg containing complex inclusions can be dispersed in the steel.

Key words： Mg-treatment oxide metallurgy inclusion HAZ low temperature impact toughness

Received: 02 November 2020

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	YANG Jian
	CAI Wen-jing

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YANG Jian,CAI Wen-jing. Effect of magnesium treatment on inclusions and HAZ microstructure and properties of steel plate[J]. Iron and Steel, 2021, 56(7): 13-24.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20200551 OR http://www.chinamet.cn/Jweb_gt/EN/Y2021/V56/I7/13

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