CAJ | 학술논문

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，AcicularFerrite）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（AI／O）在O．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10～20nmTiO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，HeatInput）时合金元素烧损较少，冷却速率较快，焊缝组织得以细化。
종술료국내외대우저합금고강강（HSLA，High Strength Low Alloy）한봉금속중침상철소체（AF，AcicularFerrite）적최신연구진전득출，요상획득교다적AF，주요종3개방면가이유효공제：①합금원소중함0．05％～0．10％C，차C당량소우0．39，합리공제Mn，Ni，Ti，B지간적상호비례，보지붕담비（B／N）재0．6—0．8지간，려양비（AI／O）재O．43～0．73지간，강저N，S，P함량；②협잡물척촌위0．5～0．8μm，표면부10～20nmTiO박층차정구형，촉사생성경다적제Ⅲ、Ⅳ류협잡물；③교저열수입（HI，HeatInput）시합금원소소손교소，냉각속솔교쾌，한봉조직득이세화。
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.