镁处理对船体钢组织细化作用的高温原位分析

doi:10.13228/j.boyuan.issn0449-749x.20190392

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Abstract With Mg treatment process,the welded heat affected zone performance of shipbuilding steel is significantly improved. To further clarify the mechanism of action of Mg,the microstructure evolution of the traditional shipbuilding steel and Mg treated shipbuilding steel during the temperature rise and fall process was observed by high temperature laser confocal microscopy,and the phase transformation of the steel structure during continuous cooling with different holding time was also studied. By comparison,it is found that the austenite grain size was not coarsened due to the pinning action of the fine inclusion particles for Mg treatment during heating process,and a large amount of IAF(intragranular acicular ferrite) were induced by inclusions inside the austenite grains during the cooling process also. The both effects caused the steel structure to be further refined,and the inclusions,which induced the IAF,exhibit a law of increasing gradually with the prolongation of the holding time. At the same time,statistics on the number and distribution of inclusions also provide strong evidence for the above results.

Key words： oxide metallurgy in-situ observation acicular ferrite pinning effect Mg treatment

Received: 23 August 2019

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	Articles by authors
	SUN Li-gen
	LEI Ming
	ZHANG Xin
	LIU Yun-song
	ZHU Li-guang

Cite this article:

SUN Li-gen,LEI Ming,ZHANG Xin等. In-situ research on microstructure refining effect of Mg treatment for shipbuilding steel at high temperature[J]. Iron and Steel, 2020, 55(5): 94-102.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20190392 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I5/94

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