690 MPa级ULCB熔敷金属组织与强韧化规律

doi:10.13228/j.boyuan.issn0449-749x.20210485

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Abstract When using traditional welding materials for high-strength steels to carry out extensive welding testing of 690 MPa grade copper precipitation strengthening steel,it was still necessary to strictly control the heat input,preheating temperature,and interpass temperature,which makes the excellent performance of copper precipitation strengthening steel and the advantage of saving production cost cannot be brought into full play. The effect of Si,Mn,Ni on the microstructure and mechanical properties of the 690 MPa grade ultra-low carbon bainite (ULCB) deposited metal was investigated by OM,SEM,TEM,in order to provide technical accumulation for domestic production of non-preheating welding materials for copper precipitation strengthening steel. Experimental results showed that the microstructure of deposited metal was primarily comprised of granular bainite (GB),lath bainite (LB),and acicular ferrite (AF). The microstructure of the deposited metal with 0.16% Si and 1.46% Mn was refined, leading to the improvement of impact toughness. However,the Si content was too low to make the width of the bainite ferrite (BF) substructure decreased,resulting in the improvement of toughness was limited. The microstructure of deposited metal with 0.29% Si,1.02% Mn and more Ni content was interlocked,and the lath width of the bainite ferrite decreased,contributing to impact toughness improved significantly. Phase transformation dislocation strengthening was affected by the bainite onset temperature (B_s),which was the main reason that affects the strength of ULCB deposited metal. Inclusions were mainly distributed between the bainite ferrite,and a small amount become the nucleation points of the acicular ferrite. Therefore,a greater increase in impact toughness would be realized by reduction in inclusion density and size of the deposited metal.

Key words： copper precipitation strengthening steel deposited metal ultra-low carbon bainite strengthening and toughening mechanism oxide inclusion

Received: 18 August 2021

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	Articles by authors
	MENG Man-ding
	AN Tong-bang
	WEI Jin-shan
	MA Cheng-yong
	ZUO Yue

Cite this article:

MENG Man-ding,AN Tong-bang,WEI Jin-shan等. Microstructure and strength-toughness mechanism of 690 MPa grade ULCB deposited metals[J]. Iron and Steel, 2022, 57(2): 149-156.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210485 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I2/149

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