太原钢铁(集团)有限公司先进不锈钢全国重点实验室,太原 030003
王岩(1982—),男,博士,正高级工程师;E-mail:15448681@qq.com
收稿:2026-04-13,
修回:2026-05-14,
录用:2026-05-15,
网络首发:2026-06-09,
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王岩,谷宇,李吉东等.冶炼工艺路线对N06625镍基合金偏析与性能的影响[J].特殊钢,
Wang Yan,Gu Yu,Li Jidong,et al.Effect of Melting Process Route on Segregation and Properties of N06625 Nickel-Based Alloy[J].Special Steel,
针对VIM+ESR以及电弧炉+AOD+连铸两种工艺生产的N06625镍基合金板材,采用力学试验机、光学显微镜、扫描电镜(SEM)、能谱(EDS)、电子探针等手段,对偏析与组织性能开展研究工作,结果表明,N06625镍基合金连铸坯Mo、Nb偏析小于传统电渣锭,可以为后续均质化及热加工创造良好条件;由于N06625镍基合金连铸坯原始枝晶细小,偏析程度轻,采用更短的均质化时间即可消除偏析,具有更好的工艺适用性,
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600 mm电渣锭合适的均质化参数是1 240 ℃/48 h;180 mm厚度连铸坯合适的均质化参数是1 240 ℃/36 h。两种工艺路线下板材力学性能、夹杂物、腐蚀性能(VIM+ESR工艺ASTM G28A、ASTM A262C、ASTM G48A数值分别为0.024 mm/月、0.03 mm/月、0 g/m
2
;AOD+连铸工艺分别为0.021 mm/月、0.03 mm/月、0 g/m
2
)均处于同一技术水平。
N06625 nickel-based alloy plates were produced by two different process routes, namely VIM+ESR and EAF+AOD+continuous casting. The segregation characteristics, microstructure and mechanical properties were systematically investigated by means of mechanical testing machine, optical microscope, SEM, EDS and electron probe microanalyzer. The results show that the segregation degrees of Mo and Nb in the continuous casting slab are lower than those in the conventional electroslag ingot, providing favorable conditions for subsequent homogenization treatment and hot working. Owing to the finer original dendrites and milder segregation, the continuous casting slab requires a shorter homogenization holding time to eliminate elemental segregation and exhibits better process applicability. Under the actual production conditions in this work, the optimal homogenizati
on parameters for the
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600 mm electroslag ingot are 1 240 ℃ for 48 h, while the parameters for the 180 mm-thick continuous casting slab are 1 240 ℃ for 36 h. The mechanical properties, inclusion characteristics and corrosion resistance of the plates manufactured by the two process routes are at the same technical level. The corrosion rates of the VIM+ESR route measured by ASTM G28A, ASTM A262C and ASTM G48A are 0.024 mm/month, 0.03 mm/month and 0 g/m
2
, respectively; the corresponding values of the EAF+AOD+continuous casting route are 0.021 mm/month, 0.03 mm/month and 0 g/m
2
.
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