摘要
综述了国内外对于低合金高强钢(HSLA,High Strength Low Alloy)焊缝金属中针状铁素体(AF,Acicular Ferrite)的最新研究进展得出,要想获得较多的AF,主要从3个方面加以有效控制:①合金元素中含0.05%～0.10%C,且C当量小于0.39,合理控制Mn,Ni,Ti,B之间的相互比例,保持硼氮比(B/N)在0.6～0.8之间,铝氧比(Al/O)在0.43～0.73之间,降低N,S,P含量;②夹杂物尺寸为0.5～0.8μm,表面富10～20 nm TiO薄层且呈球形,促使生成更多的第Ⅲ、Ⅳ类夹杂物;③较低热输入(HI,Heat Input)时合金元素烧损较少,冷却速率较快,焊缝组织得以细化。
This paper reviews the newest worldwide research progress on acicular ferrite （AF） in weld metal for high strength low alloy （HSLA） steel. More AF can be mainly obtained by the effective control of three aspects： ① when C content is between 0. 05 and 0.10% with a carbon equivalent of less than 0.39, the ratios between Mn, Ni, Ti, and B can be reasonably controlled, and the ratio of B/N is between 0.6 and 0.8, A1/O is between 0. 43 and 0. 73, while N, S, P contents are reduced; ② when the size of inclusion is in the range of 0. 5 - 0.8 μm with 10 - 20 nm TiO in the inclusion surface and with its shape being globular, then more third and fourth types of inclusions can be obtained; ③ When heat input becomes lower, the burning loss of alloy elements becomes less, while the cooling rate becomes higher, and the welding microstructure gets finer.
出处
《中国材料进展》
CAS
CSCD
2012年第1期50-55,共6页
Materials China
