铈对S32550双相不锈钢微观组织及冲击性能的影响

doi:10.13228/j.boyuan.issn0449-749x.20190165

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Abstract Duplex stainless steel has excellent properties of austenitic and ferritic stainless steel,which is widely used in shipbuilding,chemical industry,nuclear reaction and other fields. In order to further improve the mechanical properties and corrosion resistance of S32550 duplex stainless steel,S32550 duplex stainless steel was successfully smelted with vacuum induction furnace first. Furthermore,the effects of rare earth Ce on the microstructure,inclusion morphology and impact properties of the alloy after forging and rolling were studied. The results show that the addition of rare earth Ce can refine the grain of the structure and homogenize the strontium ferrite structure and the austenite structure with uneven shape distribution,improve the shape distribution of inclusions,modify the harmful inclusions MnS,reduce the S content,and make the excess S element react with Ce to form Ce₂O₂S,Ce₂S₂ inclusions dispersed in steel.In addition,the addition of rare earth Ce can improve the impact toughness of S32550 duplex stainless steel under the impact of room temperature and low temperature (-40,-20 ℃). At low temperature,the dimple zone can appear,which reduces the damage of steel to cold and brittle effect.

Key words： rare earth Ce inclusion morphology duplex stainless steel impact ductility

Received: 15 April 2019

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	Articles by authors
	YANG Ji-chun
	WANG Jun
	REN Lei
	FU Xiao-yang
	LIU Xiang-jun
	ZHANG Ze-ning

Cite this article:

YANG Ji-chun,WANG Jun,REN Lei等. Effect of Ce on microstructure and impact propertiesof S32550 duplex stainless steel[J]. Iron and Steel, 2020, 55(1): 86-92.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20190165 OR http://www.chinamet.cn/Jweb_gt/EN/Y2020/V55/I1/86

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