Effects of different helium cooling conditions on the structures of GH4169 alloy vacuum arc remelting ingots  

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作  者:DAI Pengchao 

机构地区:[1]Baowu Special Metallurgy Co.,Ltd.,Shanghai 200940,China

出  处:《Baosteel Technical Research》2020年第4期40-46,共7页宝钢技术研究(英文版)

摘  要:The effects of different helium cooling conditions on the molten pool depth,dendrite structure,and microsegregation of GH4169 alloy ?508 mm vacuum arc remelting( VAR) ingots were studied using an optical microscope and an electron probe. The results show that under different helium cooling conditions,the growth of columnar crystals in the VAR ingot is the same with a certain angle running from the edge to the center and the dendrites at the edges are relatively small whereas the dendrites near the center are large. As the helium cooling increased,the molten pool depth decreased from 137 mm to 120 mm. Observations of the microstructure showed that as the helium cooling increased,the secondary dendrite arm spacing( SDAS) decreased at the center and R/2 region. Also,the Laves phase content markedly decreased. Under the same helium cooling conditions,the SDAS and Laves phase content at the center were higher than that at the R/2 region. Thus,more intense helium cooling effectively reduced segregation in VAR ingots and improved the metallurgical quality.

关 键 词:helium cooling GH4169 alloy vacuum arc remelting 

分 类 号:TG132.3[一般工业技术—材料科学与工程]

 

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