Effect of Mg addition on formation of intragranular acicular ferrite in heat-affected zone of steel plate after high-heat-input welding

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Abstract The effects of Mg content, inclusion size, and austenite grain size on the intragranular acicular ferrite (IAF) nucleation in heat-affected zone of steel plate after high-heat-input welding of 400 kJ/cm were investigated by welding simulation and observation using a scanning electron microscope equipped with an energy dispersive spectrometer and an optical microscope. The IAFs are observed in steel with Mg addition, and the volume fraction of IAF is as high as 55.4% in the steel containing 0.0027 mass% Mg. The MgO�CAl2O3�CTi2O3�CMnS inclusions with size around 2 lm are effective nucleation sites for IAF, whereas Al2O3�CMnS inclusions are impotent to nucleate the acicular ferrite. The prior-austenite grain (PAG) size distribution in low Mg steel is similar to that in steel without Mg addition. The austenite grain with size about 200 lm is favorable for the IAF formation. In the steel with high Mg content of 0.0099%, the growth of PAG is greatly inhibited, and PAG sizes are smaller than 100 lm. Therefore, the nucleation of IAF can hardly be observed.

Key words�� Heat affected zone Inclusions Intragranular acicular ferrite Magnesium deoxidation High heat input welding Steel plate

Received: 05 May 2017 Published: 15 October 2018

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	JIAN -Yang
	RUIZHI -Wang
	YU Mo-Lin
	YU Yu-Nan

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JIAN -Yang,RUIZHI -Wang,YU Mo-Lin��. Effect of Mg addition on formation of intragranular acicular ferrite in heat-affected zone of steel plate after high-heat-input welding[J]. Journal of Iron and Steel Research International, 2018, 25(4): 433-441.

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http://gt.chinamet.cn/Jweb_gtyjxb_en/EN/ OR http://gt.chinamet.cn/Jweb_gtyjxb_en/EN/Y2018/V25/I4/433

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