氧化物冶金工艺对EH36钢HAZ组织性能的影响
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摘要
设计了Ti-Ca和Ti-Mg两种氧化物冶金脱氧工艺的EH36实验钢来考察粗晶热影响区的组织性能和冲击韧性。结果表明,两种处理工艺的实验钢热模拟后的焊接热影响区内都有大量细小的晶内针状铁素体产生;与Ti-Ca脱氧工艺相比,采用Ti-Mg脱氧工艺的实验钢,焊接热影响区中针状组织更加明显,夹杂物的类型也更加复杂,同时Ti-Mg复合脱氧工艺在焊接热循环中能够更好地钉扎奥氏体晶界。-40℃的冲击数据表明,Ti-Mg脱氧工艺处理后的实验钢HAZ冲击性能优于Ti-Ca处理工艺。
EH36 experimental steels manufactured through two different oxide metallurgy processes with Ti-Ca and Ti-Mg were designed to investigate the microstructure, properties and impact toughness of coarse-grained heat affected zone. The results show that there are a large number of fine intragranular acicular ferrites in the welding heat affected zone after the thermal simulation of the two treatment processes in the experimental steels. Compared with that with the Ti-Ca deoxidation process, the experimental steel with Ti-Mg deoxidation process shows more obvious acicular ferrite and more complicated inclusions in the heat affected zone. Inclusions formed in Ti-Mg deoxidation process can restrain the movement of austenite grains during the welding thermal cycle. The impact toughness of HAZ at-40 ℃ in Ti-Mg deoxidized steel was better than that in Ti-Ca deoxidized steel.
EH36 experimental steels manufactured through two different oxide metallurgy processes with Ti-Ca and Ti-Mg were designed to investigate the microstructure, properties and impact toughness of coarse-grained heat affected zone. The results show that there are a large number of fine intragranular acicular ferrites in the welding heat affected zone after the thermal simulation of the two treatment processes in the experimental steels. Compared with that with the Ti-Ca deoxidation process, the experimental steel with Ti-Mg deoxidation process shows more obvious acicular ferrite and more complicated inclusions in the heat affected zone. Inclusions formed in Ti-Mg deoxidation process can restrain the movement of austenite grains during the welding thermal cycle. The impact toughness of HAZ at-40 ℃ in Ti-Mg deoxidized steel was better than that in Ti-Ca deoxidized steel.
引文
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[2] Kojima A,Uemori R,Minagawa M,et al.Super high HAZ toughness steels with fine microstructure imparted by fine particles[J].Bulletin of the Japan Institute of Metals,2003,42(1):67.
[3] 陈家本,郑惠锦,朱若凡,等.中国船舶焊接技术进展[J].焊接,2007(5):1.(Chen J B,Zheng H J,Zhu R F,et al.Development of china shipbuilding welding technology[J].Welding,2007(5):1.)
[4] Takamura J,Mizoguchi S.Roles of oxides in steels performance—Metallurgy of oxides in steels 1[C]//Proceedings of the 6th International Iron and Steel Congress.Nagoya:ISIJ,1990:591.
[5] Fukunaga K.High strength TMCP steel plate for offshore structure with excellent HAZ toughness at welded joints[J].Nippon Steel and Sumitomo Metal Technical Report,2015(110):43.
[6] Kang Y B,Lee H G.Thermodynamic analysis of Mn-depleted zone near Ti oxide inclusions for intragranular nucleation of ferrite in steel[J].ISIJ International,2010,50(4):501.
[7] 李小宝,张宇,潘鑫.大线能量焊接船板EH40 电渣焊接头组织和性能[J].钢铁研究学报,2013,25(9):52.(Li X B,Zhang Y,Pan X.Microstructure and mechanical properties of electro- slag welds of shipbuilding steel plate EH40[J].Journal of Iron and Steel Research,2013,25(9):52.)
[8] 万响亮,吴开明,王恒辉,等.氧化物冶金技术在大线能量焊接用钢的应用[J].中国冶金,2015,25(6):6.(Wan X L,Wu K M,Wang H H,et al.Applications of oxide metallurgy technology on high heat input welding steel[J].China Metallurgy,2015,25(6):6.)
[9] Terada Y,Kojima A,Kiyose A,et al.High-strength linepipes with excellent HAZ toughness[J].Nippon Steel Technical Report,2004(90):88.
[10] Fukunaga K.High strength TMCP steel plate for offshore structure with excellent HAZ toughness at welded joints[J].Nippon Steel and Sumitomo Metal Technical Report,2015(110):43.
[11] Suzuki S,Oi K,Ichimiya K,et al.Development of high performance steel plate with excellent HAZ toughness in high heat input weld applying new microstructure control technology “JFE EWEL”[J].Bulletin of the Japan Institute of Metals,2004,43(3):232.
[12] 木村達己,角博幸,木谷靖.溶接部靭性に優れた建築用高張力鋼板と溶接材料—大入熱溶接部の高品質化を実現するJFE EWEL技術[J].JFE技報,2004(5):38.
[13] 鈴木伸一,一宮克行,秋田俊和.溶接熱影響部靭性に優れた造船用高張力鋼板—大入熱溶接部の高品質化を実現するJFE EWEL技術[J].JFE技報,2004(5):19.
[14] 杨春卫,白学军,冯路路.高强度船体及海洋工程用钢EH36-Z35的开发[C]//中国金属学会会议论文集.宁波:中国金属学会,2012:67.(Yang C W,Bai X J,Feng L L.The development of high-strength hull and off-shore platform plate steel EH36-Z35 [C]//Proceedings of the Chinese Society for Metals.Ningbo:The Chinese Society for Metals,2012:67.)
[15] 杨才福,苏航.高性能船舶及海洋工程用钢的开发[J].钢铁,2012,47(12):1.(Yang C F,Su H.Research and development of high performance shipbuilding and marine engineering steel[J].Iron and Steel,2012,47(12):1.)
[16] 柳德忠,李卫国,张治军.浅谈大型储罐用调质高强度钢板的焊接[J].中国化工装备,2012(5):27.(Liu D Z,Li W G,Zhang Z J.Welding of HSLA steel plates used for large storage tank[J].China Chemical Industry Equipment,2012(5):27.)
[17] 倪慧锋.船舶焊接技术应用现状[J].现代焊接,2007(11):4.(Ni H F.Application status of ship welding technology[J].Modern Welding,2007(11):4.)
[18] 段斌,孙少忠.我国建筑钢结构焊接技术的发展现状和发展趋势[J].焊接技术,2012,41(5):1.(Duan B,Sun S Z.Development status and development trend of construction steel structure welding technology in China[J].Welding Technology,2012,41(5):1.)
[19] Sakata K,Suito H.Grain-growth-inhibiting effects of primary inclusion particles of ZrO2 and MgO in Fe-10 mass Pct Ni alloy[J].Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science,2000,31(4):1213.