成分与冷却速率对高硅不锈钢凝固模式的影响

doi:10.13228/j.boyuan.issn0449-749x.20210685

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Abstract High-silicon austenitic stainless steel as a special steel is commonly used in the acid industry due to its excellent corrosion resistance for high silicon content. However, the addition of high silicon content will cause problems such as aggravation of casting defects, component segregation and an increase of precipitation phases in the steel, resulting in hot cracking during hot working. The content, morphology and distribution of δ ferrite in the solidification process of high-silicon austenitic stainless steel are closely related to the chemical composition and hot processing history of the alloy, while the solidification structure depends on the precipitation order of the precipitates and subsequent solid phase transformation. As a result, the solidification mode of stainless steel will inevitably affect the thermoplasticity of alloy. This work adopted metallographic microscope (OM), X-ray diffractometer (XRD), scanning electron microscope/energy spectrum analysis (SEM/EDS), electron probe (EPMA), JMatPro calculation and other methods to study the influence of alloy composition and cooling rate on the solidification mode of high-silicon austenitic stainless steel by adjusting the contents of Si and Cr elements, and the classic chromium-nickel equivalent algorithm was evaluated. The results show that the Schneider chromium-nickel equivalent algorithm is more accurate in predicting the solidification mode of most alloys than the Rajasekhar chromium-nickel equivalent algorithm. The solidification mode of alloy changes from the AF mode to the FA mode with the contents of Si and Cr in the alloy increasing, the alloy undergoes more “δ→γ” solid phase transition during solidification, and the increase of δ ferrite with a mass fraction of 6%Si alloy slows down. The solidification mode of alloy changes from the AF mode to the A mode with the cooling rate increasing of 5%Si ingot. The Hammar and Svensson solidification route criterion can accurately predict the initial precipitation phase of high-silicon austenitic stainless steel. This study provides a theoretical basis for rationally formulating the alloy composition and forming process of high-silicon austenitic stainless steel.

Key words： high-silicon austenitic stainless steel as-cast microstructure solidification mode cooling rate chromium-nickel equivalent

Received: 11 November 2021

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	Articles by authors
	HU Yong
	ZHANG Hui-ying
	LIN Hong-ze
	OUYANG Ming-hui
	CHU Cheng
	WANG Li-hua

Cite this article:

HU Yong,ZHANG Hui-ying,LIN Hong-ze等. Effect of elements and cooling rate on solidification mode of high-silicon stainless steel[J]. Iron and Steel, 2022, 57(5): 107-117.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210685 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I5/107

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