研究了40 t LF炉精炼AISI410不锈钢时,在常压下吹氮气增氮工艺(吹氮流量、吹氮时间及钢液温度)对AISI410不锈钢氮含量的影响,建立了AISI410不锈钢氮溶解度热力学计算模型。结果表明:钢中氮含量随着吹氮时间、氮气流量的增加而增大;常压...研究了40 t LF炉精炼AISI410不锈钢时,在常压下吹氮气增氮工艺(吹氮流量、吹氮时间及钢液温度)对AISI410不锈钢氮含量的影响,建立了AISI410不锈钢氮溶解度热力学计算模型。结果表明:钢中氮含量随着吹氮时间、氮气流量的增加而增大;常压下吹氮10 min,钢液含氮量可达到0.05%;随着氮流量增加钢液达到饱和的时间缩短,氮的溶解度随着钢液温度的降低而升高。应用热力学模型进行了分析,不同吹氮条件下氮溶解度实测值与热力学模型计算值较吻合。为LF炉精炼含氮不锈钢控制氮含量提供了理论依据。展开更多
The Co-based alloy/AISI 410 stainless steel dissimilar welded joint was fabricated by the electron beam welding(EBW)technique.The anomalous microstructure containing the element transition zone(ETZ)and/or core of tail...The Co-based alloy/AISI 410 stainless steel dissimilar welded joint was fabricated by the electron beam welding(EBW)technique.The anomalous microstructure containing the element transition zone(ETZ)and/or core of tail-like zone(CTLZ)is in the weld metal(WM)adjacent to the fusion line.The melting temperature difference between the WM and AISI 410 steel,melt stirring effect and element diffusion can trigger the formation of such anomalous microstructure.In particular,the larger distance of the region in WM away from the fusion line,the smaller CTLZ and larger ETZ occurred.Compared with the fine and ellipsoidal precipitates in the as-welded CTLZ,a large number of chain-type clustered precipitates were detected in the CTLZ and ETZ interface after the aging treatment at 566°C for 1000 h.The element diffusion under elevated temperature in WM is regarded as the crucial factor for such anomalous microstructure evolution during the aging treatment.展开更多
文摘研究了40 t LF炉精炼AISI410不锈钢时,在常压下吹氮气增氮工艺(吹氮流量、吹氮时间及钢液温度)对AISI410不锈钢氮含量的影响,建立了AISI410不锈钢氮溶解度热力学计算模型。结果表明:钢中氮含量随着吹氮时间、氮气流量的增加而增大;常压下吹氮10 min,钢液含氮量可达到0.05%;随着氮流量增加钢液达到饱和的时间缩短,氮的溶解度随着钢液温度的降低而升高。应用热力学模型进行了分析,不同吹氮条件下氮溶解度实测值与热力学模型计算值较吻合。为LF炉精炼含氮不锈钢控制氮含量提供了理论依据。
基金The authors gratefully acknowledge the National Natural Science Foundation of China(Grant Nos.U1760102 and 52101042).
文摘The Co-based alloy/AISI 410 stainless steel dissimilar welded joint was fabricated by the electron beam welding(EBW)technique.The anomalous microstructure containing the element transition zone(ETZ)and/or core of tail-like zone(CTLZ)is in the weld metal(WM)adjacent to the fusion line.The melting temperature difference between the WM and AISI 410 steel,melt stirring effect and element diffusion can trigger the formation of such anomalous microstructure.In particular,the larger distance of the region in WM away from the fusion line,the smaller CTLZ and larger ETZ occurred.Compared with the fine and ellipsoidal precipitates in the as-welded CTLZ,a large number of chain-type clustered precipitates were detected in the CTLZ and ETZ interface after the aging treatment at 566°C for 1000 h.The element diffusion under elevated temperature in WM is regarded as the crucial factor for such anomalous microstructure evolution during the aging treatment.
